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| Current File : //sys/dev/isci/scil/scic_sds_remote_node_table.c |
/*-
* This file is provided under a dual BSD/GPLv2 license. When using or
* redistributing this file, you may do so under either license.
*
* GPL LICENSE SUMMARY
*
* Copyright(c) 2008 - 2011 Intel Corporation. All rights reserved.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of version 2 of the GNU General Public License as
* published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
* The full GNU General Public License is included in this distribution
* in the file called LICENSE.GPL.
*
* BSD LICENSE
*
* Copyright(c) 2008 - 2011 Intel Corporation. All rights reserved.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD: release/9.1.0/sys/dev/isci/scil/scic_sds_remote_node_table.c 231689 2012-02-14 15:58:49Z jimharris $");
/**
* @file
*
* @brief This file contains the implementation of the
* SCIC_SDS_REMOTE_NODE_TABLE public, protected, and private methods.
*/
#include <dev/isci/scil/scic_sds_remote_node_table.h>
#include <dev/isci/scil/scic_sds_remote_node_context.h>
/**
* This routine will find the bit position in absolute bit terms of the next
* available bit for selection. The absolute bit is index * 32 + bit
* position. If there are available bits in the first U32 then it is just bit
* position.
* @param[in] remote_node_table This is the remote node index table from
* which the selection will be made.
* @param[in] group_table_index This is the index to the group table from
* which to search for an available selection.
*
* @return U32 This is the absolute bit position for an available group.
*/
static
U32 scic_sds_remote_node_table_get_group_index(
SCIC_REMOTE_NODE_TABLE_T * remote_node_table,
U32 group_table_index
)
{
U32 dword_index;
U32 * group_table;
U32 bit_index;
group_table = remote_node_table->remote_node_groups[group_table_index];
for (dword_index = 0; dword_index < remote_node_table->group_array_size; dword_index++)
{
if (group_table[dword_index] != 0)
{
for (bit_index = 0; bit_index < 32; bit_index++)
{
if ((group_table[dword_index] & (1 << bit_index)) != 0)
{
return (dword_index * 32) + bit_index;
}
}
}
}
return SCIC_SDS_REMOTE_NODE_TABLE_INVALID_INDEX;
}
/**
* This method will clear the group index entry in the specified group index
* table.
*
* @param[in out] remote_node_table This the remote node table in which to
* clear the selector.
* @param[in] set_index This is the remote node selector in which the change
* will be made.
* @param[in] group_index This is the bit index in the table to be modified.
*
* @return none
*/
static
void scic_sds_remote_node_table_clear_group_index(
SCIC_REMOTE_NODE_TABLE_T * remote_node_table,
U32 group_table_index,
U32 group_index
)
{
U32 dword_index;
U32 bit_index;
U32 * group_table;
ASSERT(group_table_index < SCU_STP_REMOTE_NODE_COUNT);
ASSERT(group_index < (U32)(remote_node_table->group_array_size * 32));
dword_index = group_index / 32;
bit_index = group_index % 32;
group_table = remote_node_table->remote_node_groups[group_table_index];
group_table[dword_index] = group_table[dword_index] & ~(1 << bit_index);
}
/**
* This method will set the group index bit entry in the specified gropu index
* table.
*
* @param[in out] remote_node_table This the remote node table in which to set
* the selector.
* @param[in] group_table_index This is the remote node selector in which the
* change will be made.
* @param[in] group_index This is the bit position in the table to be
* modified.
*
* @return none
*/
static
void scic_sds_remote_node_table_set_group_index(
SCIC_REMOTE_NODE_TABLE_T * remote_node_table,
U32 group_table_index,
U32 group_index
)
{
U32 dword_index;
U32 bit_index;
U32 * group_table;
ASSERT(group_table_index < SCU_STP_REMOTE_NODE_COUNT);
ASSERT(group_index < (U32)(remote_node_table->group_array_size * 32));
dword_index = group_index / 32;
bit_index = group_index % 32;
group_table = remote_node_table->remote_node_groups[group_table_index];
group_table[dword_index] = group_table[dword_index] | (1 << bit_index);
}
/**
* This method will set the remote to available in the remote node allocation
* table.
*
* @param[in out] remote_node_table This is the remote node table in which to
* modify the remote node availability.
* @param[in] remote_node_index This is the remote node index that is being
* returned to the table.
*
* @return none
*/
static
void scic_sds_remote_node_table_set_node_index(
SCIC_REMOTE_NODE_TABLE_T * remote_node_table,
U32 remote_node_index
)
{
U32 dword_location;
U32 dword_remainder;
U32 slot_normalized;
U32 slot_position;
ASSERT(
(remote_node_table->available_nodes_array_size * SCIC_SDS_REMOTE_NODE_SETS_PER_DWORD)
> (remote_node_index / SCU_STP_REMOTE_NODE_COUNT)
);
dword_location = remote_node_index / SCIC_SDS_REMOTE_NODES_PER_DWORD;
dword_remainder = remote_node_index % SCIC_SDS_REMOTE_NODES_PER_DWORD;
slot_normalized = (dword_remainder / SCU_STP_REMOTE_NODE_COUNT) * sizeof(U32);
slot_position = remote_node_index % SCU_STP_REMOTE_NODE_COUNT;
remote_node_table->available_remote_nodes[dword_location] |=
1 << (slot_normalized + slot_position);
}
/**
* This method clears the remote node index from the table of available remote
* nodes.
*
* @param[in out] remote_node_table This is the remote node table from which
* to clear the available remote node bit.
* @param[in] remote_node_index This is the remote node index which is to be
* cleared from the table.
*
* @return none
*/
static
void scic_sds_remote_node_table_clear_node_index(
SCIC_REMOTE_NODE_TABLE_T * remote_node_table,
U32 remote_node_index
)
{
U32 dword_location;
U32 dword_remainder;
U32 slot_position;
U32 slot_normalized;
ASSERT(
(remote_node_table->available_nodes_array_size * SCIC_SDS_REMOTE_NODE_SETS_PER_DWORD)
> (remote_node_index / SCU_STP_REMOTE_NODE_COUNT)
);
dword_location = remote_node_index / SCIC_SDS_REMOTE_NODES_PER_DWORD;
dword_remainder = remote_node_index % SCIC_SDS_REMOTE_NODES_PER_DWORD;
slot_normalized = (dword_remainder / SCU_STP_REMOTE_NODE_COUNT) * sizeof(U32);
slot_position = remote_node_index % SCU_STP_REMOTE_NODE_COUNT;
remote_node_table->available_remote_nodes[dword_location] &=
~(1 << (slot_normalized + slot_position));
}
/**
* This method clears the entire table slot at the specified slot index.
*
* @param[in out] remote_node_table The remote node table from which the slot
* will be cleared.
* @param[in] group_index The index for the slot that is to be cleared.
*
* @return none
*/
static
void scic_sds_remote_node_table_clear_group(
SCIC_REMOTE_NODE_TABLE_T * remote_node_table,
U32 group_index
)
{
U32 dword_location;
U32 dword_remainder;
U32 dword_value;
ASSERT(
(remote_node_table->available_nodes_array_size * SCIC_SDS_REMOTE_NODE_SETS_PER_DWORD)
> (group_index / SCU_STP_REMOTE_NODE_COUNT)
);
dword_location = group_index / SCIC_SDS_REMOTE_NODE_SETS_PER_DWORD;
dword_remainder = group_index % SCIC_SDS_REMOTE_NODE_SETS_PER_DWORD;
dword_value = remote_node_table->available_remote_nodes[dword_location];
dword_value &= ~(SCIC_SDS_REMOTE_NODE_TABLE_FULL_SLOT_VALUE << (dword_remainder * 4));
remote_node_table->available_remote_nodes[dword_location] = dword_value;
}
/**
* THis method sets an entire remote node group in the remote node table.
*
* @param[in] remote_node_table
* @param[in] group_index
*/
static
void scic_sds_remote_node_table_set_group(
SCIC_REMOTE_NODE_TABLE_T * remote_node_table,
U32 group_index
)
{
U32 dword_location;
U32 dword_remainder;
U32 dword_value;
ASSERT(
(remote_node_table->available_nodes_array_size * SCIC_SDS_REMOTE_NODE_SETS_PER_DWORD)
> (group_index / SCU_STP_REMOTE_NODE_COUNT)
);
dword_location = group_index / SCIC_SDS_REMOTE_NODE_SETS_PER_DWORD;
dword_remainder = group_index % SCIC_SDS_REMOTE_NODE_SETS_PER_DWORD;
dword_value = remote_node_table->available_remote_nodes[dword_location];
dword_value |= (SCIC_SDS_REMOTE_NODE_TABLE_FULL_SLOT_VALUE << (dword_remainder * 4));
remote_node_table->available_remote_nodes[dword_location] = dword_value;
}
/**
* This method will return the group value for the specified group index.
*
* @param[in] remote_node_table This is the remote node table that for which
* the group value is to be returned.
* @param[in] group_index This is the group index to use to find the group
* value.
*
* @return The bit values at the specified remote node group index.
*/
static
U8 scic_sds_remote_node_table_get_group_value(
SCIC_REMOTE_NODE_TABLE_T * remote_node_table,
U32 group_index
)
{
U32 dword_location;
U32 dword_remainder;
U32 dword_value;
dword_location = group_index / SCIC_SDS_REMOTE_NODE_SETS_PER_DWORD;
dword_remainder = group_index % SCIC_SDS_REMOTE_NODE_SETS_PER_DWORD;
dword_value = remote_node_table->available_remote_nodes[dword_location];
dword_value &= (SCIC_SDS_REMOTE_NODE_TABLE_FULL_SLOT_VALUE << (dword_remainder * 4));
dword_value = dword_value >> (dword_remainder * 4);
return (U8)dword_value;
}
/**
* This method will initialize the remote node table for use.
*
* @param[in out] remote_node_table The remote that which is to be
* initialized.
* @param[in] remote_node_entries The number of entries to put in the table.
*
* @return none
*/
void scic_sds_remote_node_table_initialize(
SCIC_REMOTE_NODE_TABLE_T * remote_node_table,
U32 remote_node_entries
)
{
U32 index;
// Initialize the raw data we could improve the speed by only initializing
// those entries that we are actually going to be used
memset(
remote_node_table->available_remote_nodes,
0x00,
sizeof(remote_node_table->available_remote_nodes)
);
memset(
remote_node_table->remote_node_groups,
0x00,
sizeof(remote_node_table->remote_node_groups)
);
// Initialize the available remote node sets
remote_node_table->available_nodes_array_size = (U16)
(remote_node_entries / SCIC_SDS_REMOTE_NODES_PER_DWORD)
+ ((remote_node_entries % SCIC_SDS_REMOTE_NODES_PER_DWORD) != 0);
// Initialize each full DWORD to a FULL SET of remote nodes
for (index = 0; index < remote_node_entries; index++)
{
scic_sds_remote_node_table_set_node_index(remote_node_table, index);
}
remote_node_table->group_array_size = (U16)
(remote_node_entries / (SCU_STP_REMOTE_NODE_COUNT * 32))
+ ((remote_node_entries % (SCU_STP_REMOTE_NODE_COUNT * 32)) != 0);
for (index = 0; index < (remote_node_entries / SCU_STP_REMOTE_NODE_COUNT); index++)
{
// These are all guaranteed to be full slot values so fill them in the
// available sets of 3 remote nodes
scic_sds_remote_node_table_set_group_index(remote_node_table, 2, index);
}
// Now fill in any remainders that we may find
if ((remote_node_entries % SCU_STP_REMOTE_NODE_COUNT) == 2)
{
scic_sds_remote_node_table_set_group_index(remote_node_table, 1, index);
}
else if ((remote_node_entries % SCU_STP_REMOTE_NODE_COUNT) == 1)
{
scic_sds_remote_node_table_set_group_index(remote_node_table, 0, index);
}
}
/**
* This method will allocate a single RNi from the remote node table. The
* table index will determine from which remote node group table to search.
* This search may fail and another group node table can be specified. The
* function is designed to allow a serach of the available single remote node
* group up to the triple remote node group. If an entry is found in the
* specified table the remote node is removed and the remote node groups are
* updated.
*
* @param[in out] remote_node_table The remote node table from which to
* allocate a remote node.
* @param[in] table_index The group index that is to be used for the search.
*
* @return The RNi value or an invalid remote node context if an RNi can not
* be found.
*/
static
U16 scic_sds_remote_node_table_allocate_single_remote_node(
SCIC_REMOTE_NODE_TABLE_T * remote_node_table,
U32 group_table_index
)
{
U8 index;
U8 group_value;
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);
// We could not find an available slot in the table selector 0
if (group_index != SCIC_SDS_REMOTE_NODE_TABLE_INVALID_INDEX)
{
group_value = scic_sds_remote_node_table_get_group_value(
remote_node_table, group_index);
for (index = 0; index < SCU_STP_REMOTE_NODE_COUNT; index++)
{
if (((1 << index) & group_value) != 0)
{
// We have selected a bit now clear it
remote_node_index = (U16) (group_index * SCU_STP_REMOTE_NODE_COUNT
+ index);
scic_sds_remote_node_table_clear_group_index(
remote_node_table, group_table_index, group_index
);
scic_sds_remote_node_table_clear_node_index(
remote_node_table, remote_node_index
);
if (group_table_index > 0)
{
scic_sds_remote_node_table_set_group_index(
remote_node_table, group_table_index - 1, group_index
);
}
break;
}
}
}
return remote_node_index;
}
/**
* This method will allocate three consecutive remote node context entries. If
* there are no remaining triple entries the function will return a failure.
*
* @param[in] remote_node_table This is the remote node table from which to
* allocate the remote node entries.
* @param[in] group_table_index THis is the group table index which must equal
* two (2) for this operation.
*
* @return The remote node index that represents three consecutive remote node
* 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);
}
}