SFI: add capability to parse ACPI tables
Extend SFI to access standard ACPI tables. (eg. the PCI MCFG) using sfi_acpi_table_parse(). Note that this is _not_ a hybrid ACPI + SFI mode. The platform boots in either ACPI mode or SFI mode. SFI runs only with acpi_disabled=1, which can be set at build-time via CONFIG_ACPI=n, or at boot time by the failure to find ACPI platform support. So this extension simply allows SFI-platforms to re-use existing standard table formats that happen to be defined to live in ACPI envelopes. Signed-off-by: Feng Tang <feng.tang@intel.com> Signed-off-by: Len Brown <len.brown@intel.com>
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Feng Tang
Len Brown
parent
6ae6996a46
commit
13e82d023c
175
drivers/sfi/sfi_acpi.c
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175
drivers/sfi/sfi_acpi.c
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/* sfi_acpi.c Simple Firmware Interface - ACPI extensions */
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/*
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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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GPL LICENSE SUMMARY
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Copyright(c) 2009 Intel Corporation. All rights reserved.
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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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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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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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BSD LICENSE
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Copyright(c) 2009 Intel Corporation. All rights reserved.
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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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* 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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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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#define KMSG_COMPONENT "SFI"
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#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
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#include <linux/kernel.h>
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#include <acpi/acpi.h>
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#include <linux/sfi.h>
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#include "sfi_core.h"
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/*
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* SFI can access ACPI-defined tables via an optional ACPI XSDT.
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*
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* This allows re-use, and avoids re-definition, of standard tables.
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* For example, the "MCFG" table is defined by PCI, reserved by ACPI,
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* and is expected to be present many SFI-only systems.
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*/
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static struct acpi_table_xsdt *xsdt_va __read_mostly;
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#define XSDT_GET_NUM_ENTRIES(ptable, entry_type) \
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((ptable->header.length - sizeof(struct acpi_table_header)) / \
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(sizeof(entry_type)))
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static inline struct sfi_table_header *acpi_to_sfi_th(
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struct acpi_table_header *th)
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{
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return (struct sfi_table_header *)th;
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}
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static inline struct acpi_table_header *sfi_to_acpi_th(
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struct sfi_table_header *th)
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{
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return (struct acpi_table_header *)th;
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}
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/*
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* sfi_acpi_parse_xsdt()
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*
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* Parse the ACPI XSDT for later access by sfi_acpi_table_parse().
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*/
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static int __init sfi_acpi_parse_xsdt(struct sfi_table_header *th)
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{
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struct sfi_table_key key = SFI_ANY_KEY;
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int tbl_cnt, i;
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void *ret;
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xsdt_va = (struct acpi_table_xsdt *)th;
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tbl_cnt = XSDT_GET_NUM_ENTRIES(xsdt_va, u64);
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for (i = 0; i < tbl_cnt; i++) {
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ret = sfi_check_table(xsdt_va->table_offset_entry[i], &key);
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if (IS_ERR(ret)) {
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disable_sfi();
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return -1;
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}
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}
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return 0;
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}
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int __init sfi_acpi_init(void)
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{
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struct sfi_table_key xsdt_key = { .sig = SFI_SIG_XSDT };
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sfi_table_parse(SFI_SIG_XSDT, NULL, NULL, sfi_acpi_parse_xsdt);
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/* Only call the get_table to keep the table mapped */
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xsdt_va = (struct acpi_table_xsdt *)sfi_get_table(&xsdt_key);
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return 0;
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}
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static struct acpi_table_header *sfi_acpi_get_table(struct sfi_table_key *key)
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{
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u32 tbl_cnt, i;
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void *ret;
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tbl_cnt = XSDT_GET_NUM_ENTRIES(xsdt_va, u64);
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for (i = 0; i < tbl_cnt; i++) {
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ret = sfi_check_table(xsdt_va->table_offset_entry[i], key);
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if (!IS_ERR(ret) && ret)
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return sfi_to_acpi_th(ret);
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}
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return NULL;
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}
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static void sfi_acpi_put_table(struct acpi_table_header *table)
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{
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sfi_put_table(acpi_to_sfi_th(table));
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}
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/*
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* sfi_acpi_table_parse()
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*
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* Find specified table in XSDT, run handler on it and return its return value
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*/
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int sfi_acpi_table_parse(char *signature, char *oem_id, char *oem_table_id,
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int(*handler)(struct acpi_table_header *))
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{
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struct acpi_table_header *table = NULL;
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struct sfi_table_key key;
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int ret = 0;
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if (sfi_disabled)
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return -1;
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key.sig = signature;
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key.oem_id = oem_id;
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key.oem_table_id = oem_table_id;
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table = sfi_acpi_get_table(&key);
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if (!table)
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return -EINVAL;
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ret = handler(table);
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sfi_acpi_put_table(table);
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return ret;
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}
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93
include/linux/sfi_acpi.h
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93
include/linux/sfi_acpi.h
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@ -0,0 +1,93 @@
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/* sfi.h Simple Firmware Interface */
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/*
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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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GPL LICENSE SUMMARY
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Copyright(c) 2009 Intel Corporation. All rights reserved.
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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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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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BSD LICENSE
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Copyright(c) 2009 Intel Corporation. All rights reserved.
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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
|
||||
are met:
|
||||
|
||||
* Redistributions of source code must retain the above copyright
|
||||
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,
|
||||
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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#ifndef _LINUX_SFI_ACPI_H
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#define _LINUX_SFI_ACPI_H
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#ifdef CONFIG_SFI
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#include <acpi/acpi.h> /* struct acpi_table_header */
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extern int sfi_acpi_table_parse(char *signature, char *oem_id,
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char *oem_table_id,
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int (*handler)(struct acpi_table_header *));
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static inline int acpi_sfi_table_parse(char *signature,
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int (*handler)(struct acpi_table_header *))
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{
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if (!acpi_table_parse(signature, handler))
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return 0;
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return sfi_acpi_table_parse(signature, NULL, NULL, handler);
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}
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#else /* !CONFIG_SFI */
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static inline int sfi_acpi_table_parse(char *signature, char *oem_id,
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char *oem_table_id,
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int (*handler)(struct acpi_table_header *))
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{
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return -1;
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}
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static inline int acpi_sfi_table_parse(char *signature,
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int (*handler)(struct acpi_table_header *))
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{
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return acpi_table_parse(signature, handler);
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}
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#endif /* !CONFIG_SFI */
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#endif /*_LINUX_SFI_ACPI_H*/
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