![Lv Zheng](/assets/img/avatar_default.png)
It is reported that Linux x86 kernel cannot map large tables. The following
large SSDT table on such platform fails to pass checksum verification and
cannot be installed:
ACPI: SSDT 0x00000000B9638018 07A0C4 (v02 INTEL S2600CP 00004000 INTL 20100331)
It sounds strange that in the 64-bit virtual memory address space, we
cannot map a single ACPI table to do checksum verification. The root cause
is:
1. ACPICA doesn't split IO memory mapping and table mapping;
2. Linux x86 OSL implements acpi_os_map_memory() using a size limited fix-map
mechanism during early boot stage, which is more suitable for only IO
mappings.
ACPICA originally only mapped table header for signature validation, and
this header mapping is required by OSL override mechanism. There was no
checksum verification because we could not map the whole table using this
OSL. While the following ACPICA commit enforces checksum verification by
mapping the whole table during Linux boot stage and it finally triggers
this issue on some platforms:
Commit: 86dfc6f339
Subject: ACPICA: Tables: Fix table checksums verification before installation.
Before doing further cleanups for the OSL table mapping and override
implementation, this patch introduces an option for such OSPMs to
temporarily discard the checksum verification feature. It then can be
re-enabled easily when the ACPICA and the underlying OSL is ready.
This patch also deletes a comment around the limitation of mappings because
it is not correct. The limitation is not how many times we can map in the
early stage, but the OSL mapping facility may not be suitable for mapping
the ACPI tables and thus may complain us the size limitation.
The acpi_tb_verify_table() is renamed to acpi_tb_verify_temp_table() due to the
work around added, it now only applies to the table descriptor that hasn't
been installed and cannot be used in other cases. Lv Zheng.
Tested-by: Yuanhan Liu <yuanhan.liu@linux.intel.com>
Signed-off-by: Lv Zheng <lv.zheng@intel.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
402 lines
12 KiB
C
402 lines
12 KiB
C
/******************************************************************************
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*
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* Module Name: tbutils - ACPI Table utilities
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*
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*****************************************************************************/
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/*
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* Copyright (C) 2000 - 2014, Intel Corp.
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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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* 1. 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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* without modification.
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* 2. Redistributions in binary form must reproduce at minimum a disclaimer
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* substantially similar to the "NO WARRANTY" disclaimer below
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* ("Disclaimer") and any redistribution must be conditioned upon
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* including a substantially similar Disclaimer requirement for further
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* binary redistribution.
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* 3. Neither the names of the above-listed copyright holders nor the names
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* of any 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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* Alternatively, this software may be distributed under the terms of the
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* GNU General Public License ("GPL") version 2 as published by the Free
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* Software Foundation.
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*
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* NO WARRANTY
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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 MERCHANTIBILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
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* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGES.
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*/
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#include <acpi/acpi.h>
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#include "accommon.h"
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#include "actables.h"
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#define _COMPONENT ACPI_TABLES
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ACPI_MODULE_NAME("tbutils")
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/* Local prototypes */
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static acpi_physical_address
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acpi_tb_get_root_table_entry(u8 *table_entry, u32 table_entry_size);
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#if (!ACPI_REDUCED_HARDWARE)
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/*******************************************************************************
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*
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* FUNCTION: acpi_tb_initialize_facs
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*
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* PARAMETERS: None
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*
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* RETURN: Status
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*
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* DESCRIPTION: Create a permanent mapping for the FADT and save it in a global
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* for accessing the Global Lock and Firmware Waking Vector
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*
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******************************************************************************/
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acpi_status acpi_tb_initialize_facs(void)
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{
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acpi_status status;
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/* If Hardware Reduced flag is set, there is no FACS */
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if (acpi_gbl_reduced_hardware) {
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acpi_gbl_FACS = NULL;
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return (AE_OK);
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}
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status = acpi_get_table_by_index(ACPI_TABLE_INDEX_FACS,
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ACPI_CAST_INDIRECT_PTR(struct
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acpi_table_header,
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&acpi_gbl_FACS));
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return (status);
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}
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#endif /* !ACPI_REDUCED_HARDWARE */
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/*******************************************************************************
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*
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* FUNCTION: acpi_tb_tables_loaded
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*
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* PARAMETERS: None
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*
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* RETURN: TRUE if required ACPI tables are loaded
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*
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* DESCRIPTION: Determine if the minimum required ACPI tables are present
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* (FADT, FACS, DSDT)
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*
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******************************************************************************/
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u8 acpi_tb_tables_loaded(void)
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{
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if (acpi_gbl_root_table_list.current_table_count >= 3) {
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return (TRUE);
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}
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return (FALSE);
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}
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/*******************************************************************************
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*
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* FUNCTION: acpi_tb_check_dsdt_header
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*
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* PARAMETERS: None
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*
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* RETURN: None
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*
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* DESCRIPTION: Quick compare to check validity of the DSDT. This will detect
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* if the DSDT has been replaced from outside the OS and/or if
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* the DSDT header has been corrupted.
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*
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******************************************************************************/
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void acpi_tb_check_dsdt_header(void)
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{
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/* Compare original length and checksum to current values */
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if (acpi_gbl_original_dsdt_header.length != acpi_gbl_DSDT->length ||
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acpi_gbl_original_dsdt_header.checksum != acpi_gbl_DSDT->checksum) {
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ACPI_BIOS_ERROR((AE_INFO,
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"The DSDT has been corrupted or replaced - "
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"old, new headers below"));
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acpi_tb_print_table_header(0, &acpi_gbl_original_dsdt_header);
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acpi_tb_print_table_header(0, acpi_gbl_DSDT);
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ACPI_ERROR((AE_INFO,
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"Please send DMI info to linux-acpi@vger.kernel.org\n"
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"If system does not work as expected, please boot with acpi=copy_dsdt"));
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/* Disable further error messages */
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acpi_gbl_original_dsdt_header.length = acpi_gbl_DSDT->length;
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acpi_gbl_original_dsdt_header.checksum =
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acpi_gbl_DSDT->checksum;
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}
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}
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/*******************************************************************************
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*
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* FUNCTION: acpi_tb_copy_dsdt
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*
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* PARAMETERS: table_desc - Installed table to copy
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*
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* RETURN: None
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*
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* DESCRIPTION: Implements a subsystem option to copy the DSDT to local memory.
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* Some very bad BIOSs are known to either corrupt the DSDT or
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* install a new, bad DSDT. This copy works around the problem.
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*
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******************************************************************************/
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struct acpi_table_header *acpi_tb_copy_dsdt(u32 table_index)
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{
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struct acpi_table_header *new_table;
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struct acpi_table_desc *table_desc;
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table_desc = &acpi_gbl_root_table_list.tables[table_index];
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new_table = ACPI_ALLOCATE(table_desc->length);
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if (!new_table) {
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ACPI_ERROR((AE_INFO, "Could not copy DSDT of length 0x%X",
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table_desc->length));
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return (NULL);
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}
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ACPI_MEMCPY(new_table, table_desc->pointer, table_desc->length);
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acpi_tb_uninstall_table(table_desc);
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acpi_tb_init_table_descriptor(&acpi_gbl_root_table_list.
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tables[ACPI_TABLE_INDEX_DSDT],
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ACPI_PTR_TO_PHYSADDR(new_table),
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ACPI_TABLE_ORIGIN_INTERNAL_VIRTUAL,
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new_table);
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ACPI_INFO((AE_INFO,
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"Forced DSDT copy: length 0x%05X copied locally, original unmapped",
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new_table->length));
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return (new_table);
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}
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/*******************************************************************************
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*
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* FUNCTION: acpi_tb_get_root_table_entry
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*
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* PARAMETERS: table_entry - Pointer to the RSDT/XSDT table entry
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* table_entry_size - sizeof 32 or 64 (RSDT or XSDT)
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*
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* RETURN: Physical address extracted from the root table
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*
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* DESCRIPTION: Get one root table entry. Handles 32-bit and 64-bit cases on
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* both 32-bit and 64-bit platforms
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*
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* NOTE: acpi_physical_address is 32-bit on 32-bit platforms, 64-bit on
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* 64-bit platforms.
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*
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******************************************************************************/
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static acpi_physical_address
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acpi_tb_get_root_table_entry(u8 *table_entry, u32 table_entry_size)
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{
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u64 address64;
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/*
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* Get the table physical address (32-bit for RSDT, 64-bit for XSDT):
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* Note: Addresses are 32-bit aligned (not 64) in both RSDT and XSDT
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*/
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if (table_entry_size == ACPI_RSDT_ENTRY_SIZE) {
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/*
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* 32-bit platform, RSDT: Return 32-bit table entry
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* 64-bit platform, RSDT: Expand 32-bit to 64-bit and return
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*/
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return ((acpi_physical_address)
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(*ACPI_CAST_PTR(u32, table_entry)));
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} else {
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/*
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* 32-bit platform, XSDT: Truncate 64-bit to 32-bit and return
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* 64-bit platform, XSDT: Move (unaligned) 64-bit to local,
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* return 64-bit
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*/
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ACPI_MOVE_64_TO_64(&address64, table_entry);
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#if ACPI_MACHINE_WIDTH == 32
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if (address64 > ACPI_UINT32_MAX) {
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/* Will truncate 64-bit address to 32 bits, issue warning */
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ACPI_BIOS_WARNING((AE_INFO,
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"64-bit Physical Address in XSDT is too large (0x%8.8X%8.8X),"
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" truncating",
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ACPI_FORMAT_UINT64(address64)));
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}
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#endif
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return ((acpi_physical_address) (address64));
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}
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}
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/*******************************************************************************
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*
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* FUNCTION: acpi_tb_parse_root_table
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*
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* PARAMETERS: rsdp - Pointer to the RSDP
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*
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* RETURN: Status
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*
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* DESCRIPTION: This function is called to parse the Root System Description
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* Table (RSDT or XSDT)
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*
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* NOTE: Tables are mapped (not copied) for efficiency. The FACS must
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* be mapped and cannot be copied because it contains the actual
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* memory location of the ACPI Global Lock.
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*
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******************************************************************************/
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acpi_status __init acpi_tb_parse_root_table(acpi_physical_address rsdp_address)
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{
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struct acpi_table_rsdp *rsdp;
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u32 table_entry_size;
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u32 i;
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u32 table_count;
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struct acpi_table_header *table;
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acpi_physical_address address;
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u32 length;
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u8 *table_entry;
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acpi_status status;
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u32 table_index;
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ACPI_FUNCTION_TRACE(tb_parse_root_table);
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/* Map the entire RSDP and extract the address of the RSDT or XSDT */
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rsdp = acpi_os_map_memory(rsdp_address, sizeof(struct acpi_table_rsdp));
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if (!rsdp) {
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return_ACPI_STATUS(AE_NO_MEMORY);
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}
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acpi_tb_print_table_header(rsdp_address,
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ACPI_CAST_PTR(struct acpi_table_header,
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rsdp));
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/* Use XSDT if present and not overridden. Otherwise, use RSDT */
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if ((rsdp->revision > 1) &&
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rsdp->xsdt_physical_address && !acpi_gbl_do_not_use_xsdt) {
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/*
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* RSDP contains an XSDT (64-bit physical addresses). We must use
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* the XSDT if the revision is > 1 and the XSDT pointer is present,
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* as per the ACPI specification.
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*/
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address = (acpi_physical_address) rsdp->xsdt_physical_address;
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table_entry_size = ACPI_XSDT_ENTRY_SIZE;
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} else {
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/* Root table is an RSDT (32-bit physical addresses) */
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address = (acpi_physical_address) rsdp->rsdt_physical_address;
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table_entry_size = ACPI_RSDT_ENTRY_SIZE;
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}
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/*
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* It is not possible to map more than one entry in some environments,
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* so unmap the RSDP here before mapping other tables
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*/
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acpi_os_unmap_memory(rsdp, sizeof(struct acpi_table_rsdp));
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/* Map the RSDT/XSDT table header to get the full table length */
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table = acpi_os_map_memory(address, sizeof(struct acpi_table_header));
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if (!table) {
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return_ACPI_STATUS(AE_NO_MEMORY);
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}
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acpi_tb_print_table_header(address, table);
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/*
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* Validate length of the table, and map entire table.
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* Minimum length table must contain at least one entry.
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*/
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length = table->length;
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acpi_os_unmap_memory(table, sizeof(struct acpi_table_header));
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if (length < (sizeof(struct acpi_table_header) + table_entry_size)) {
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ACPI_BIOS_ERROR((AE_INFO,
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"Invalid table length 0x%X in RSDT/XSDT",
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length));
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return_ACPI_STATUS(AE_INVALID_TABLE_LENGTH);
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}
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table = acpi_os_map_memory(address, length);
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if (!table) {
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return_ACPI_STATUS(AE_NO_MEMORY);
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}
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/* Validate the root table checksum */
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status = acpi_tb_verify_checksum(table, length);
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if (ACPI_FAILURE(status)) {
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acpi_os_unmap_memory(table, length);
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return_ACPI_STATUS(status);
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}
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/* Get the number of entries and pointer to first entry */
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table_count = (u32)((table->length - sizeof(struct acpi_table_header)) /
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table_entry_size);
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table_entry = ACPI_ADD_PTR(u8, table, sizeof(struct acpi_table_header));
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/*
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* First two entries in the table array are reserved for the DSDT
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* and FACS, which are not actually present in the RSDT/XSDT - they
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* come from the FADT
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*/
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acpi_gbl_root_table_list.current_table_count = 2;
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/* Initialize the root table array from the RSDT/XSDT */
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for (i = 0; i < table_count; i++) {
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/* Get the table physical address (32-bit for RSDT, 64-bit for XSDT) */
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address =
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acpi_tb_get_root_table_entry(table_entry, table_entry_size);
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/* Skip NULL entries in RSDT/XSDT */
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if (!address) {
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goto next_table;
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}
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status = acpi_tb_install_standard_table(address,
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ACPI_TABLE_ORIGIN_INTERNAL_PHYSICAL,
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FALSE, TRUE,
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&table_index);
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if (ACPI_SUCCESS(status) &&
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ACPI_COMPARE_NAME(&acpi_gbl_root_table_list.
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tables[table_index].signature,
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ACPI_SIG_FADT)) {
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acpi_tb_parse_fadt(table_index);
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}
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next_table:
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table_entry += table_entry_size;
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}
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acpi_os_unmap_memory(table, length);
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return_ACPI_STATUS(AE_OK);
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}
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