599 lines
20 KiB
C
599 lines
20 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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* * Neither the name of Intel Corporation nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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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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/**
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* This file contains the implementation of the SCIC_SDS_REMOTE_NODE_TABLE
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* public, protected, and private methods.
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*
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*
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*/
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#include "remote_node_table.h"
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#include "remote_node_context.h"
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/**
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*
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* @remote_node_table: This is the remote node index table from which the
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* selection will be made.
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* @group_table_index: This is the index to the group table from which to
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* search for an available selection.
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*
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* This routine will find the bit position in absolute bit terms of the next 32
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* + bit position. If there are available bits in the first u32 then it is
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* just bit position. u32 This is the absolute bit position for an available
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* group.
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*/
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static u32 sci_remote_node_table_get_group_index(
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struct sci_remote_node_table *remote_node_table,
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u32 group_table_index)
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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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if (group_table[dword_index] != 0) {
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for (bit_index = 0; bit_index < 32; bit_index++) {
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if ((group_table[dword_index] & (1 << bit_index)) != 0) {
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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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*
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* @out]: remote_node_table This the remote node table in which to clear the
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* selector.
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* @set_index: This is the remote node selector in which the change will be
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* made.
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* @group_index: This is the bit index in the table to be modified.
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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. none
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*/
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static void sci_remote_node_table_clear_group_index(
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struct sci_remote_node_table *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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u32 dword_index;
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u32 bit_index;
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u32 *group_table;
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BUG_ON(group_table_index >= SCU_STP_REMOTE_NODE_COUNT);
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BUG_ON(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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*
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* @out]: remote_node_table This the remote node table in which to set the
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* selector.
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* @group_table_index: This is the remote node selector in which the change
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* will be made.
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* @group_index: This is the bit position in the table to be modified.
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*
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* This method will set the group index bit entry in the specified gropu index
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* table. none
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*/
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static void sci_remote_node_table_set_group_index(
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struct sci_remote_node_table *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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u32 dword_index;
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u32 bit_index;
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u32 *group_table;
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BUG_ON(group_table_index >= SCU_STP_REMOTE_NODE_COUNT);
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BUG_ON(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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*
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* @out]: remote_node_table This is the remote node table in which to modify
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* the remote node availability.
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* @remote_node_index: This is the remote node index that is being returned to
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* the table.
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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. none
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*/
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static void sci_remote_node_table_set_node_index(
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struct sci_remote_node_table *remote_node_table,
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u32 remote_node_index)
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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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BUG_ON(
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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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*
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* @out]: remote_node_table This is the remote node table from which to clear
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* the available remote node bit.
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* @remote_node_index: This is the remote node index which is to be cleared
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* from the table.
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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. none
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*/
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static void sci_remote_node_table_clear_node_index(
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struct sci_remote_node_table *remote_node_table,
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u32 remote_node_index)
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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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BUG_ON(
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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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*
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* @out]: remote_node_table The remote node table from which the slot will be
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* cleared.
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* @group_index: The index for the slot that is to be cleared.
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*
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* This method clears the entire table slot at the specified slot index. none
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*/
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static void sci_remote_node_table_clear_group(
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struct sci_remote_node_table *remote_node_table,
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u32 group_index)
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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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BUG_ON(
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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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*
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* @remote_node_table:
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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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static void sci_remote_node_table_set_group(
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struct sci_remote_node_table *remote_node_table,
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u32 group_index)
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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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BUG_ON(
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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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*
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* @remote_node_table: This is the remote node table that for which the group
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* value is to be returned.
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* @group_index: This is the group index to use to find the group value.
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*
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* This method will return the group value for the specified group index. The
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* bit values at the specified remote node group index.
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*/
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static u8 sci_remote_node_table_get_group_value(
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struct sci_remote_node_table *remote_node_table,
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u32 group_index)
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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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*
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* @out]: remote_node_table The remote that which is to be initialized.
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* @remote_node_entries: The number of entries to put in the table.
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*
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* This method will initialize the remote node table for use. none
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*/
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void sci_remote_node_table_initialize(
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struct sci_remote_node_table *remote_node_table,
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u32 remote_node_entries)
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{
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u32 index;
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/*
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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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sci_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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sci_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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sci_remote_node_table_set_group_index(remote_node_table, 1, index);
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} else if ((remote_node_entries % SCU_STP_REMOTE_NODE_COUNT) == 1) {
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sci_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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*
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* @out]: remote_node_table The remote node table from which to allocate a
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* remote node.
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* @table_index: The group index that is to be used for the search.
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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. 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 u16 sci_remote_node_table_allocate_single_remote_node(
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struct sci_remote_node_table *remote_node_table,
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u32 group_table_index)
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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 = sci_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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group_value = sci_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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if (((1 << index) & group_value) != 0) {
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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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sci_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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sci_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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sci_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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*
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* @remote_node_table: This is the remote node table from which to allocate the
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* remote node entries.
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* @group_table_index: THis is the group table index which must equal two (2)
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* for this operation.
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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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* The remote node index that represents three consecutive remote node entries
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* or an invalid remote node context if none can be found.
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*/
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static u16 sci_remote_node_table_allocate_triple_remote_node(
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struct sci_remote_node_table *remote_node_table,
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u32 group_table_index)
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{
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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 = sci_remote_node_table_get_group_index(
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remote_node_table, group_table_index);
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if (group_index != SCIC_SDS_REMOTE_NODE_TABLE_INVALID_INDEX) {
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remote_node_index = (u16)group_index * SCU_STP_REMOTE_NODE_COUNT;
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sci_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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sci_remote_node_table_clear_group(
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remote_node_table, group_index
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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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*
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* @remote_node_table: This is the remote node table from which the remote node
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* allocation is to take place.
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* @remote_node_count: This is ther remote node count which is one of
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* SCU_SSP_REMOTE_NODE_COUNT(1) or SCU_STP_REMOTE_NODE_COUNT(3).
|
|
*
|
|
* 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). u16 This is
|
|
* the remote node index that is returned or an invalid remote node context.
|
|
*/
|
|
u16 sci_remote_node_table_allocate_remote_node(
|
|
struct sci_remote_node_table *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 =
|
|
sci_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 =
|
|
sci_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 =
|
|
sci_remote_node_table_allocate_single_remote_node(
|
|
remote_node_table, 2);
|
|
}
|
|
} else if (remote_node_count == SCU_STP_REMOTE_NODE_COUNT) {
|
|
remote_node_index =
|
|
sci_remote_node_table_allocate_triple_remote_node(
|
|
remote_node_table, 2);
|
|
}
|
|
|
|
return remote_node_index;
|
|
}
|
|
|
|
/**
|
|
*
|
|
* @remote_node_table:
|
|
*
|
|
* This method will free a single remote node index back to the remote node
|
|
* table. This routine will update the remote node groups
|
|
*/
|
|
static void sci_remote_node_table_release_single_remote_node(
|
|
struct sci_remote_node_table *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 = sci_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. */
|
|
BUG_ON(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. */
|
|
sci_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 */
|
|
sci_remote_node_table_clear_group_index(remote_node_table, 0, group_index);
|
|
sci_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. */
|
|
sci_remote_node_table_clear_group_index(remote_node_table, 1, group_index);
|
|
sci_remote_node_table_set_group_index(remote_node_table, 2, group_index);
|
|
}
|
|
|
|
sci_remote_node_table_set_node_index(remote_node_table, remote_node_index);
|
|
}
|
|
|
|
/**
|
|
*
|
|
* @remote_node_table: This is the remote node table to which the remote node
|
|
* index is to be freed.
|
|
*
|
|
* This method will release a group of three consecutive remote nodes back to
|
|
* the free remote nodes.
|
|
*/
|
|
static void sci_remote_node_table_release_triple_remote_node(
|
|
struct sci_remote_node_table *remote_node_table,
|
|
u16 remote_node_index)
|
|
{
|
|
u32 group_index;
|
|
|
|
group_index = remote_node_index / SCU_STP_REMOTE_NODE_COUNT;
|
|
|
|
sci_remote_node_table_set_group_index(
|
|
remote_node_table, 2, group_index
|
|
);
|
|
|
|
sci_remote_node_table_set_group(remote_node_table, group_index);
|
|
}
|
|
|
|
/**
|
|
*
|
|
* @remote_node_table: The remote node table to which the remote node index is
|
|
* to be freed.
|
|
* @remote_node_count: This is the count of consecutive remote nodes that are
|
|
* to be freed.
|
|
*
|
|
* This method will release the remote node index back into the remote node
|
|
* table free pool.
|
|
*/
|
|
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)
|
|
{
|
|
if (remote_node_count == SCU_SSP_REMOTE_NODE_COUNT) {
|
|
sci_remote_node_table_release_single_remote_node(
|
|
remote_node_table, remote_node_index);
|
|
} else if (remote_node_count == SCU_STP_REMOTE_NODE_COUNT) {
|
|
sci_remote_node_table_release_triple_remote_node(
|
|
remote_node_table, remote_node_index);
|
|
}
|
|
}
|
|
|