661 lines
22 KiB
C
661 lines
22 KiB
C
/*-
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* This file is provided under a dual BSD/GPLv2 license. When using or
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* redistributing this file, you may do so under either license.
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*
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* GPL LICENSE SUMMARY
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*
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* Copyright(c) 2008 - 2011 Intel Corporation. All rights reserved.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of version 2 of the GNU General Public License as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
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* The full GNU General Public License is included in this distribution
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* in the file called LICENSE.GPL.
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*
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* BSD LICENSE
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*
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* Copyright(c) 2008 - 2011 Intel Corporation. All rights reserved.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* * Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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/**
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* @file
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*
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* @brief This file contains the implementation of the
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* SCIC_SDS_REMOTE_NODE_TABLE public, protected, and private methods.
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*/
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#include <dev/isci/scil/scic_sds_remote_node_table.h>
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#include <dev/isci/scil/scic_sds_remote_node_context.h>
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/**
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* This routine will find the bit position in absolute bit terms of the next
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* available bit for selection. The absolute bit is index * 32 + bit
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* position. If there are available bits in the first U32 then it is just bit
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* position.
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* @param[in] remote_node_table This is the remote node index table from
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* which the selection will be made.
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* @param[in] group_table_index This is the index to the group table from
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* which to search for an available selection.
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*
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* @return U32 This is the absolute bit position for an available group.
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*/
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static
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U32 scic_sds_remote_node_table_get_group_index(
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SCIC_REMOTE_NODE_TABLE_T * remote_node_table,
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U32 group_table_index
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)
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{
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U32 dword_index;
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U32 * group_table;
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U32 bit_index;
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group_table = remote_node_table->remote_node_groups[group_table_index];
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for (dword_index = 0; dword_index < remote_node_table->group_array_size; dword_index++)
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{
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if (group_table[dword_index] != 0)
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{
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for (bit_index = 0; bit_index < 32; bit_index++)
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{
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if ((group_table[dword_index] & (1 << bit_index)) != 0)
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{
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return (dword_index * 32) + bit_index;
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}
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}
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}
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}
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return SCIC_SDS_REMOTE_NODE_TABLE_INVALID_INDEX;
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}
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/**
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* This method will clear the group index entry in the specified group index
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* table.
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*
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* @param[in out] remote_node_table This the remote node table in which to
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* clear the selector.
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* @param[in] set_index This is the remote node selector in which the change
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* will be made.
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* @param[in] group_index This is the bit index in the table to be modified.
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*
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* @return none
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*/
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static
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void scic_sds_remote_node_table_clear_group_index(
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SCIC_REMOTE_NODE_TABLE_T * remote_node_table,
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U32 group_table_index,
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U32 group_index
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)
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{
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U32 dword_index;
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U32 bit_index;
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U32 * group_table;
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ASSERT(group_table_index < SCU_STP_REMOTE_NODE_COUNT);
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ASSERT(group_index < (U32)(remote_node_table->group_array_size * 32));
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dword_index = group_index / 32;
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bit_index = group_index % 32;
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group_table = remote_node_table->remote_node_groups[group_table_index];
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group_table[dword_index] = group_table[dword_index] & ~(1 << bit_index);
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}
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/**
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* This method will set the group index bit entry in the specified group index
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* table.
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*
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* @param[in out] remote_node_table This the remote node table in which to set
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* the selector.
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* @param[in] group_table_index This is the remote node selector in which the
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* change will be made.
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* @param[in] group_index This is the bit position in the table to be
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* modified.
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*
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* @return none
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*/
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static
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void scic_sds_remote_node_table_set_group_index(
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SCIC_REMOTE_NODE_TABLE_T * remote_node_table,
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U32 group_table_index,
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U32 group_index
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)
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{
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U32 dword_index;
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U32 bit_index;
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U32 * group_table;
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ASSERT(group_table_index < SCU_STP_REMOTE_NODE_COUNT);
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ASSERT(group_index < (U32)(remote_node_table->group_array_size * 32));
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dword_index = group_index / 32;
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bit_index = group_index % 32;
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group_table = remote_node_table->remote_node_groups[group_table_index];
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group_table[dword_index] = group_table[dword_index] | (1 << bit_index);
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}
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/**
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* This method will set the remote to available in the remote node allocation
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* table.
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*
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* @param[in out] remote_node_table This is the remote node table in which to
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* modify the remote node availability.
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* @param[in] remote_node_index This is the remote node index that is being
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* returned to the table.
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*
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* @return none
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*/
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static
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void scic_sds_remote_node_table_set_node_index(
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SCIC_REMOTE_NODE_TABLE_T * remote_node_table,
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U32 remote_node_index
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)
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{
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U32 dword_location;
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U32 dword_remainder;
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U32 slot_normalized;
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U32 slot_position;
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ASSERT(
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(remote_node_table->available_nodes_array_size * SCIC_SDS_REMOTE_NODE_SETS_PER_DWORD)
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> (remote_node_index / SCU_STP_REMOTE_NODE_COUNT)
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);
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dword_location = remote_node_index / SCIC_SDS_REMOTE_NODES_PER_DWORD;
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dword_remainder = remote_node_index % SCIC_SDS_REMOTE_NODES_PER_DWORD;
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slot_normalized = (dword_remainder / SCU_STP_REMOTE_NODE_COUNT) * sizeof(U32);
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slot_position = remote_node_index % SCU_STP_REMOTE_NODE_COUNT;
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remote_node_table->available_remote_nodes[dword_location] |=
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1 << (slot_normalized + slot_position);
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}
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/**
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* This method clears the remote node index from the table of available remote
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* nodes.
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*
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* @param[in out] remote_node_table This is the remote node table from which
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* to clear the available remote node bit.
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* @param[in] remote_node_index This is the remote node index which is to be
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* cleared from the table.
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*
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* @return none
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*/
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static
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void scic_sds_remote_node_table_clear_node_index(
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SCIC_REMOTE_NODE_TABLE_T * remote_node_table,
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U32 remote_node_index
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)
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{
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U32 dword_location;
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U32 dword_remainder;
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U32 slot_position;
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U32 slot_normalized;
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ASSERT(
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(remote_node_table->available_nodes_array_size * SCIC_SDS_REMOTE_NODE_SETS_PER_DWORD)
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> (remote_node_index / SCU_STP_REMOTE_NODE_COUNT)
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);
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dword_location = remote_node_index / SCIC_SDS_REMOTE_NODES_PER_DWORD;
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dword_remainder = remote_node_index % SCIC_SDS_REMOTE_NODES_PER_DWORD;
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slot_normalized = (dword_remainder / SCU_STP_REMOTE_NODE_COUNT) * sizeof(U32);
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slot_position = remote_node_index % SCU_STP_REMOTE_NODE_COUNT;
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remote_node_table->available_remote_nodes[dword_location] &=
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~(1 << (slot_normalized + slot_position));
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}
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/**
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* This method clears the entire table slot at the specified slot index.
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*
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* @param[in out] remote_node_table The remote node table from which the slot
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* will be cleared.
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* @param[in] group_index The index for the slot that is to be cleared.
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*
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* @return none
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*/
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static
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void scic_sds_remote_node_table_clear_group(
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SCIC_REMOTE_NODE_TABLE_T * remote_node_table,
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U32 group_index
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)
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{
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U32 dword_location;
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U32 dword_remainder;
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U32 dword_value;
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ASSERT(
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(remote_node_table->available_nodes_array_size * SCIC_SDS_REMOTE_NODE_SETS_PER_DWORD)
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> (group_index / SCU_STP_REMOTE_NODE_COUNT)
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);
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dword_location = group_index / SCIC_SDS_REMOTE_NODE_SETS_PER_DWORD;
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dword_remainder = group_index % SCIC_SDS_REMOTE_NODE_SETS_PER_DWORD;
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dword_value = remote_node_table->available_remote_nodes[dword_location];
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dword_value &= ~(SCIC_SDS_REMOTE_NODE_TABLE_FULL_SLOT_VALUE << (dword_remainder * 4));
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remote_node_table->available_remote_nodes[dword_location] = dword_value;
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}
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/**
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* THis method sets an entire remote node group in the remote node table.
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*
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* @param[in] remote_node_table
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* @param[in] group_index
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*/
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static
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void scic_sds_remote_node_table_set_group(
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SCIC_REMOTE_NODE_TABLE_T * remote_node_table,
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U32 group_index
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)
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{
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U32 dword_location;
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U32 dword_remainder;
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U32 dword_value;
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ASSERT(
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(remote_node_table->available_nodes_array_size * SCIC_SDS_REMOTE_NODE_SETS_PER_DWORD)
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> (group_index / SCU_STP_REMOTE_NODE_COUNT)
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);
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dword_location = group_index / SCIC_SDS_REMOTE_NODE_SETS_PER_DWORD;
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dword_remainder = group_index % SCIC_SDS_REMOTE_NODE_SETS_PER_DWORD;
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dword_value = remote_node_table->available_remote_nodes[dword_location];
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dword_value |= (SCIC_SDS_REMOTE_NODE_TABLE_FULL_SLOT_VALUE << (dword_remainder * 4));
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remote_node_table->available_remote_nodes[dword_location] = dword_value;
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}
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/**
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* This method will return the group value for the specified group index.
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*
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* @param[in] remote_node_table This is the remote node table that for which
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* the group value is to be returned.
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* @param[in] group_index This is the group index to use to find the group
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* value.
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*
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* @return The bit values at the specified remote node group index.
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*/
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static
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U8 scic_sds_remote_node_table_get_group_value(
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SCIC_REMOTE_NODE_TABLE_T * remote_node_table,
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U32 group_index
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)
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{
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U32 dword_location;
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U32 dword_remainder;
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U32 dword_value;
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dword_location = group_index / SCIC_SDS_REMOTE_NODE_SETS_PER_DWORD;
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dword_remainder = group_index % SCIC_SDS_REMOTE_NODE_SETS_PER_DWORD;
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dword_value = remote_node_table->available_remote_nodes[dword_location];
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dword_value &= (SCIC_SDS_REMOTE_NODE_TABLE_FULL_SLOT_VALUE << (dword_remainder * 4));
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dword_value = dword_value >> (dword_remainder * 4);
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return (U8)dword_value;
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}
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/**
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* This method will initialize the remote node table for use.
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*
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* @param[in out] remote_node_table The remote that which is to be
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* initialized.
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* @param[in] remote_node_entries The number of entries to put in the table.
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*
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* @return none
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*/
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void scic_sds_remote_node_table_initialize(
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SCIC_REMOTE_NODE_TABLE_T * remote_node_table,
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U32 remote_node_entries
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)
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{
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U32 index;
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// Initialize the raw data we could improve the speed by only initializing
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// those entries that we are actually going to be used
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memset(
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remote_node_table->available_remote_nodes,
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0x00,
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sizeof(remote_node_table->available_remote_nodes)
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);
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memset(
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remote_node_table->remote_node_groups,
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0x00,
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sizeof(remote_node_table->remote_node_groups)
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);
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// Initialize the available remote node sets
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remote_node_table->available_nodes_array_size = (U16)
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(remote_node_entries / SCIC_SDS_REMOTE_NODES_PER_DWORD)
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+ ((remote_node_entries % SCIC_SDS_REMOTE_NODES_PER_DWORD) != 0);
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// Initialize each full DWORD to a FULL SET of remote nodes
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for (index = 0; index < remote_node_entries; index++)
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{
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scic_sds_remote_node_table_set_node_index(remote_node_table, index);
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}
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remote_node_table->group_array_size = (U16)
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(remote_node_entries / (SCU_STP_REMOTE_NODE_COUNT * 32))
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+ ((remote_node_entries % (SCU_STP_REMOTE_NODE_COUNT * 32)) != 0);
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for (index = 0; index < (remote_node_entries / SCU_STP_REMOTE_NODE_COUNT); index++)
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{
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// These are all guaranteed to be full slot values so fill them in the
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// available sets of 3 remote nodes
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scic_sds_remote_node_table_set_group_index(remote_node_table, 2, index);
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}
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// Now fill in any remainders that we may find
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if ((remote_node_entries % SCU_STP_REMOTE_NODE_COUNT) == 2)
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{
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scic_sds_remote_node_table_set_group_index(remote_node_table, 1, index);
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}
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else if ((remote_node_entries % SCU_STP_REMOTE_NODE_COUNT) == 1)
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{
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scic_sds_remote_node_table_set_group_index(remote_node_table, 0, index);
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}
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}
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/**
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* This method will allocate a single RNi from the remote node table. The
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* table index will determine from which remote node group table to search.
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* This search may fail and another group node table can be specified. The
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* function is designed to allow a serach of the available single remote node
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* group up to the triple remote node group. If an entry is found in the
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* specified table the remote node is removed and the remote node groups are
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* updated.
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*
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* @param[in out] remote_node_table The remote node table from which to
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* allocate a remote node.
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* @param[in] table_index The group index that is to be used for the search.
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*
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* @return The RNi value or an invalid remote node context if an RNi can not
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* be found.
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*/
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static
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U16 scic_sds_remote_node_table_allocate_single_remote_node(
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SCIC_REMOTE_NODE_TABLE_T * remote_node_table,
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U32 group_table_index
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)
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{
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U8 index;
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U8 group_value;
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U32 group_index;
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U16 remote_node_index = SCIC_SDS_REMOTE_NODE_CONTEXT_INVALID_INDEX;
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group_index = scic_sds_remote_node_table_get_group_index(
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remote_node_table, group_table_index);
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// We could not find an available slot in the table selector 0
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if (group_index != SCIC_SDS_REMOTE_NODE_TABLE_INVALID_INDEX)
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{
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group_value = scic_sds_remote_node_table_get_group_value(
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remote_node_table, group_index);
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for (index = 0; index < SCU_STP_REMOTE_NODE_COUNT; index++)
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{
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if (((1 << index) & group_value) != 0)
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{
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// We have selected a bit now clear it
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remote_node_index = (U16) (group_index * SCU_STP_REMOTE_NODE_COUNT
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+ index);
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scic_sds_remote_node_table_clear_group_index(
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remote_node_table, group_table_index, group_index
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);
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scic_sds_remote_node_table_clear_node_index(
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remote_node_table, remote_node_index
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);
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if (group_table_index > 0)
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{
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scic_sds_remote_node_table_set_group_index(
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remote_node_table, group_table_index - 1, group_index
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);
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}
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break;
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}
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}
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}
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return remote_node_index;
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}
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/**
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* This method will allocate three consecutive remote node context entries. If
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* there are no remaining triple entries the function will return a failure.
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*
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* @param[in] remote_node_table This is the remote node table from which to
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* allocate the remote node entries.
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* @param[in] group_table_index THis is the group table index which must equal
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* two (2) for this operation.
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*
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* @return The remote node index that represents three consecutive remote node
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|
* entries or an invalid remote node context if none can be found.
|
|
*/
|
|
static
|
|
U16 scic_sds_remote_node_table_allocate_triple_remote_node(
|
|
SCIC_REMOTE_NODE_TABLE_T * remote_node_table,
|
|
U32 group_table_index
|
|
)
|
|
{
|
|
U32 group_index;
|
|
U16 remote_node_index = SCIC_SDS_REMOTE_NODE_CONTEXT_INVALID_INDEX;
|
|
|
|
group_index = scic_sds_remote_node_table_get_group_index(
|
|
remote_node_table, group_table_index);
|
|
|
|
if (group_index != SCIC_SDS_REMOTE_NODE_TABLE_INVALID_INDEX)
|
|
{
|
|
remote_node_index = (U16) group_index * SCU_STP_REMOTE_NODE_COUNT;
|
|
|
|
scic_sds_remote_node_table_clear_group_index(
|
|
remote_node_table, group_table_index, group_index
|
|
);
|
|
|
|
scic_sds_remote_node_table_clear_group(
|
|
remote_node_table, group_index
|
|
);
|
|
}
|
|
|
|
return remote_node_index;
|
|
}
|
|
|
|
/**
|
|
* This method will allocate a remote node that mataches the remote node count
|
|
* specified by the caller. Valid values for remote node count is
|
|
* SCU_SSP_REMOTE_NODE_COUNT(1) or SCU_STP_REMOTE_NODE_COUNT(3).
|
|
*
|
|
* @param[in] remote_node_table This is the remote node table from which the
|
|
* remote node allocation is to take place.
|
|
* @param[in] remote_node_count This is ther remote node count which is one of
|
|
* SCU_SSP_REMOTE_NODE_COUNT(1) or SCU_STP_REMOTE_NODE_COUNT(3).
|
|
*
|
|
* @return U16 This is the remote node index that is returned or an invalid
|
|
* remote node context.
|
|
*/
|
|
U16 scic_sds_remote_node_table_allocate_remote_node(
|
|
SCIC_REMOTE_NODE_TABLE_T * remote_node_table,
|
|
U32 remote_node_count
|
|
)
|
|
{
|
|
U16 remote_node_index = SCIC_SDS_REMOTE_NODE_CONTEXT_INVALID_INDEX;
|
|
|
|
if (remote_node_count == SCU_SSP_REMOTE_NODE_COUNT)
|
|
{
|
|
remote_node_index =
|
|
scic_sds_remote_node_table_allocate_single_remote_node(
|
|
remote_node_table, 0);
|
|
|
|
if (remote_node_index == SCIC_SDS_REMOTE_NODE_CONTEXT_INVALID_INDEX)
|
|
{
|
|
remote_node_index =
|
|
scic_sds_remote_node_table_allocate_single_remote_node(
|
|
remote_node_table, 1);
|
|
}
|
|
|
|
if (remote_node_index == SCIC_SDS_REMOTE_NODE_CONTEXT_INVALID_INDEX)
|
|
{
|
|
remote_node_index =
|
|
scic_sds_remote_node_table_allocate_single_remote_node(
|
|
remote_node_table, 2);
|
|
}
|
|
}
|
|
else if (remote_node_count == SCU_STP_REMOTE_NODE_COUNT)
|
|
{
|
|
remote_node_index =
|
|
scic_sds_remote_node_table_allocate_triple_remote_node(
|
|
remote_node_table, 2);
|
|
}
|
|
|
|
return remote_node_index;
|
|
}
|
|
|
|
/**
|
|
* This method will free a single remote node index back to the remote node
|
|
* table. This routine will update the remote node groups
|
|
*
|
|
* @param[in] remote_node_table
|
|
* @param[in] remote_node_index
|
|
*/
|
|
static
|
|
void scic_sds_remote_node_table_release_single_remote_node(
|
|
SCIC_REMOTE_NODE_TABLE_T * remote_node_table,
|
|
U16 remote_node_index
|
|
)
|
|
{
|
|
U32 group_index;
|
|
U8 group_value;
|
|
|
|
group_index = remote_node_index / SCU_STP_REMOTE_NODE_COUNT;
|
|
|
|
group_value = scic_sds_remote_node_table_get_group_value(remote_node_table, group_index);
|
|
|
|
// Assert that we are not trying to add an entry to a slot that is already
|
|
// full.
|
|
ASSERT(group_value != SCIC_SDS_REMOTE_NODE_TABLE_FULL_SLOT_VALUE);
|
|
|
|
if (group_value == 0x00)
|
|
{
|
|
// There are no entries in this slot so it must be added to the single
|
|
// slot table.
|
|
scic_sds_remote_node_table_set_group_index(remote_node_table, 0, group_index);
|
|
}
|
|
else if ((group_value & (group_value -1)) == 0)
|
|
{
|
|
// There is only one entry in this slot so it must be moved from the
|
|
// single slot table to the dual slot table
|
|
scic_sds_remote_node_table_clear_group_index(remote_node_table, 0, group_index);
|
|
scic_sds_remote_node_table_set_group_index(remote_node_table, 1, group_index);
|
|
}
|
|
else
|
|
{
|
|
// There are two entries in the slot so it must be moved from the dual
|
|
// slot table to the tripple slot table.
|
|
scic_sds_remote_node_table_clear_group_index(remote_node_table, 1, group_index);
|
|
scic_sds_remote_node_table_set_group_index(remote_node_table, 2, group_index);
|
|
}
|
|
|
|
scic_sds_remote_node_table_set_node_index(remote_node_table, remote_node_index);
|
|
}
|
|
|
|
/**
|
|
* This method will release a group of three consecutive remote nodes back to
|
|
* the free remote nodes.
|
|
*
|
|
* @param[in] remote_node_table This is the remote node table to which the
|
|
* remote node index is to be freed.
|
|
* @param[in] remote_node_index This is the remote node index which is being
|
|
* freed.
|
|
*/
|
|
static
|
|
void scic_sds_remote_node_table_release_triple_remote_node(
|
|
SCIC_REMOTE_NODE_TABLE_T * remote_node_table,
|
|
U16 remote_node_index
|
|
)
|
|
{
|
|
U32 group_index;
|
|
|
|
group_index = remote_node_index / SCU_STP_REMOTE_NODE_COUNT;
|
|
|
|
scic_sds_remote_node_table_set_group_index(
|
|
remote_node_table, 2, group_index
|
|
);
|
|
|
|
scic_sds_remote_node_table_set_group(remote_node_table, group_index);
|
|
}
|
|
|
|
/**
|
|
* This method will release the remote node index back into the remote node
|
|
* table free pool.
|
|
*
|
|
* @param[in] remote_node_table The remote node table to which the remote node
|
|
* index is to be freed.
|
|
* @param[in] remote_node_count This is the count of consecutive remote nodes
|
|
* that are to be freed.
|
|
* @param[in] remote_node_index This is the remote node index of the start of
|
|
* the number of remote nodes to be freed.
|
|
*/
|
|
void scic_sds_remote_node_table_release_remote_node_index(
|
|
SCIC_REMOTE_NODE_TABLE_T * remote_node_table,
|
|
U32 remote_node_count,
|
|
U16 remote_node_index
|
|
)
|
|
{
|
|
if (remote_node_count == SCU_SSP_REMOTE_NODE_COUNT)
|
|
{
|
|
scic_sds_remote_node_table_release_single_remote_node(
|
|
remote_node_table, remote_node_index);
|
|
}
|
|
else if (remote_node_count == SCU_STP_REMOTE_NODE_COUNT)
|
|
{
|
|
scic_sds_remote_node_table_release_triple_remote_node(
|
|
remote_node_table, remote_node_index);
|
|
}
|
|
}
|
|
|