diff options
Diffstat (limited to 'drivers/scsi/isci/remote_node_table.h')
| -rw-r--r-- | drivers/scsi/isci/remote_node_table.h | 188 |
1 files changed, 188 insertions, 0 deletions
diff --git a/drivers/scsi/isci/remote_node_table.h b/drivers/scsi/isci/remote_node_table.h new file mode 100644 index 000000000..0ddfdda2b --- /dev/null +++ b/drivers/scsi/isci/remote_node_table.h @@ -0,0 +1,188 @@ +/* + * This file is provided under a dual BSD/GPLv2 license. When using or + * redistributing this file, you may do so under either license. + * + * GPL LICENSE SUMMARY + * + * Copyright(c) 2008 - 2011 Intel Corporation. All rights reserved. + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of version 2 of the GNU General Public License as + * published by the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, but + * WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA. + * The full GNU General Public License is included in this distribution + * in the file called LICENSE.GPL. + * + * BSD LICENSE + * + * Copyright(c) 2008 - 2011 Intel Corporation. All rights reserved. + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * + * * Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * * Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in + * the documentation and/or other materials provided with the + * distribution. + * * Neither the name of Intel Corporation nor the names of its + * contributors may be used to endorse or promote products derived + * from this software without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS + * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT + * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR + * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT + * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, + * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT + * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, + * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY + * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT + * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE + * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + */ + +#ifndef _SCIC_SDS_REMOTE_NODE_TABLE_H_ +#define _SCIC_SDS_REMOTE_NODE_TABLE_H_ + +#include "isci.h" + +/** + * + * + * Remote node sets are sets of remote node index in the remote node table. The + * SCU hardware requires that STP remote node entries take three consecutive + * remote node index so the table is arranged in sets of three. The bits are + * used as 0111 0111 to make a byte and the bits define the set of three remote + * nodes to use as a sequence. + */ +#define SCIC_SDS_REMOTE_NODE_SETS_PER_BYTE 2 + +/** + * + * + * Since the remote node table is organized as DWORDS take the remote node sets + * in bytes and represent them in DWORDs. The lowest ordered bits are the ones + * used in case full DWORD is not being used. i.e. 0000 0000 0000 0000 0111 + * 0111 0111 0111 // if only a single WORD is in use in the DWORD. + */ +#define SCIC_SDS_REMOTE_NODE_SETS_PER_DWORD \ + (sizeof(u32) * SCIC_SDS_REMOTE_NODE_SETS_PER_BYTE) +/** + * + * + * This is a count of the numeber of remote nodes that can be represented in a + * byte + */ +#define SCIC_SDS_REMOTE_NODES_PER_BYTE \ + (SCU_STP_REMOTE_NODE_COUNT * SCIC_SDS_REMOTE_NODE_SETS_PER_BYTE) + +/** + * + * + * This is a count of the number of remote nodes that can be represented in a + * DWROD + */ +#define SCIC_SDS_REMOTE_NODES_PER_DWORD \ + (sizeof(u32) * SCIC_SDS_REMOTE_NODES_PER_BYTE) + +/** + * + * + * This is the number of bits in a remote node group + */ +#define SCIC_SDS_REMOTE_NODES_BITS_PER_GROUP 4 + +#define SCIC_SDS_REMOTE_NODE_TABLE_INVALID_INDEX (0xFFFFFFFF) +#define SCIC_SDS_REMOTE_NODE_TABLE_FULL_SLOT_VALUE (0x07) +#define SCIC_SDS_REMOTE_NODE_TABLE_EMPTY_SLOT_VALUE (0x00) + +/** + * + * + * Expander attached sata remote node count + */ +#define SCU_STP_REMOTE_NODE_COUNT 3 + +/** + * + * + * Expander or direct attached ssp remote node count + */ +#define SCU_SSP_REMOTE_NODE_COUNT 1 + +/** + * + * + * Direct attached STP remote node count + */ +#define SCU_SATA_REMOTE_NODE_COUNT 1 + +/** + * struct sci_remote_node_table - + * + * + */ +struct sci_remote_node_table { + /** + * This field contains the array size in dwords + */ + u16 available_nodes_array_size; + + /** + * This field contains the array size of the + */ + u16 group_array_size; + + /** + * This field is the array of available remote node entries in bits. + * Because of the way STP remote node data is allocated on the SCU hardware + * the remote nodes must occupy three consecutive remote node context + * entries. For ease of allocation and de-allocation we have broken the + * sets of three into a single nibble. When the STP RNi is allocated all + * of the bits in the nibble are cleared. This math results in a table size + * of MAX_REMOTE_NODES / CONSECUTIVE RNi ENTRIES for STP / 2 entries per byte. + */ + u32 available_remote_nodes[ + (SCI_MAX_REMOTE_DEVICES / SCIC_SDS_REMOTE_NODES_PER_DWORD) + + ((SCI_MAX_REMOTE_DEVICES % SCIC_SDS_REMOTE_NODES_PER_DWORD) != 0)]; + + /** + * This field is the nibble selector for the above table. There are three + * possible selectors each for fast lookup when trying to find one, two or + * three remote node entries. + */ + u32 remote_node_groups[ + SCU_STP_REMOTE_NODE_COUNT][ + (SCI_MAX_REMOTE_DEVICES / (32 * SCU_STP_REMOTE_NODE_COUNT)) + + ((SCI_MAX_REMOTE_DEVICES % (32 * SCU_STP_REMOTE_NODE_COUNT)) != 0)]; + +}; + +/* --------------------------------------------------------------------------- */ + +void sci_remote_node_table_initialize( + struct sci_remote_node_table *remote_node_table, + u32 remote_node_entries); + +u16 sci_remote_node_table_allocate_remote_node( + struct sci_remote_node_table *remote_node_table, + u32 remote_node_count); + +void sci_remote_node_table_release_remote_node_index( + struct sci_remote_node_table *remote_node_table, + u32 remote_node_count, + u16 remote_node_index); + +#endif /* _SCIC_SDS_REMOTE_NODE_TABLE_H_ */ |