diff options
Diffstat (limited to 'drivers/acpi/acpica/tbfadt.c')
| -rw-r--r-- | drivers/acpi/acpica/tbfadt.c | 394 |
1 files changed, 220 insertions, 174 deletions
diff --git a/drivers/acpi/acpica/tbfadt.c b/drivers/acpi/acpica/tbfadt.c index 9d99f218969..41519a95808 100644 --- a/drivers/acpi/acpica/tbfadt.c +++ b/drivers/acpi/acpica/tbfadt.c @@ -5,7 +5,7 @@ *****************************************************************************/ /* - * Copyright (C) 2000 - 2013, Intel Corp. + * Copyright (C) 2000 - 2014, Intel Corp. * All rights reserved. * * Redistribution and use in source and binary forms, with or without @@ -52,14 +52,16 @@ ACPI_MODULE_NAME("tbfadt") static void acpi_tb_init_generic_address(struct acpi_generic_address *generic_address, u8 space_id, - u8 byte_width, u64 address, char *register_name); + u8 byte_width, + u64 address, char *register_name, u8 flags); static void acpi_tb_convert_fadt(void); -static void acpi_tb_validate_fadt(void); - static void acpi_tb_setup_fadt_registers(void); +static u64 +acpi_tb_select_address(char *register_name, u32 address32, u64 address64); + /* Table for conversion of FADT to common internal format and FADT validation */ typedef struct acpi_fadt_info { @@ -68,13 +70,14 @@ typedef struct acpi_fadt_info { u16 address32; u16 length; u8 default_length; - u8 type; + u8 flags; } acpi_fadt_info; #define ACPI_FADT_OPTIONAL 0 #define ACPI_FADT_REQUIRED 1 #define ACPI_FADT_SEPARATE_LENGTH 2 +#define ACPI_FADT_GPE_REGISTER 4 static struct acpi_fadt_info fadt_info_table[] = { {"Pm1aEventBlock", @@ -124,14 +127,14 @@ static struct acpi_fadt_info fadt_info_table[] = { ACPI_FADT_OFFSET(gpe0_block), ACPI_FADT_OFFSET(gpe0_block_length), 0, - ACPI_FADT_SEPARATE_LENGTH}, + ACPI_FADT_SEPARATE_LENGTH | ACPI_FADT_GPE_REGISTER}, {"Gpe1Block", ACPI_FADT_OFFSET(xgpe1_block), ACPI_FADT_OFFSET(gpe1_block), ACPI_FADT_OFFSET(gpe1_block_length), 0, - ACPI_FADT_SEPARATE_LENGTH} + ACPI_FADT_SEPARATE_LENGTH | ACPI_FADT_GPE_REGISTER} }; #define ACPI_FADT_INFO_ENTRIES \ @@ -175,6 +178,7 @@ static struct acpi_fadt_pm_info fadt_pm_info_table[] = { * space_id - ACPI Space ID for this register * byte_width - Width of this register * address - Address of the register + * register_name - ASCII name of the ACPI register * * RETURN: None * @@ -187,19 +191,29 @@ static struct acpi_fadt_pm_info fadt_pm_info_table[] = { static void acpi_tb_init_generic_address(struct acpi_generic_address *generic_address, u8 space_id, - u8 byte_width, u64 address, char *register_name) + u8 byte_width, + u64 address, char *register_name, u8 flags) { u8 bit_width; - /* Bit width field in the GAS is only one byte long, 255 max */ - + /* + * Bit width field in the GAS is only one byte long, 255 max. + * Check for bit_width overflow in GAS. + */ bit_width = (u8)(byte_width * 8); - - if (byte_width > 31) { /* (31*8)=248 */ - ACPI_ERROR((AE_INFO, - "%s - 32-bit FADT register is too long (%u bytes, %u bits) " - "to convert to GAS struct - 255 bits max, truncating", - register_name, byte_width, (byte_width * 8))); + if (byte_width > 31) { /* (31*8)=248, (32*8)=256 */ + /* + * No error for GPE blocks, because we do not use the bit_width + * for GPEs, the legacy length (byte_width) is used instead to + * allow for a large number of GPEs. + */ + if (!(flags & ACPI_FADT_GPE_REGISTER)) { + ACPI_ERROR((AE_INFO, + "%s - 32-bit FADT register is too long (%u bytes, %u bits) " + "to convert to GAS struct - 255 bits max, truncating", + register_name, byte_width, + (byte_width * 8))); + } bit_width = 255; } @@ -220,6 +234,68 @@ acpi_tb_init_generic_address(struct acpi_generic_address *generic_address, /******************************************************************************* * + * FUNCTION: acpi_tb_select_address + * + * PARAMETERS: register_name - ASCII name of the ACPI register + * address32 - 32-bit address of the register + * address64 - 64-bit address of the register + * + * RETURN: The resolved 64-bit address + * + * DESCRIPTION: Select between 32-bit and 64-bit versions of addresses within + * the FADT. Used for the FACS and DSDT addresses. + * + * NOTES: + * + * Check for FACS and DSDT address mismatches. An address mismatch between + * the 32-bit and 64-bit address fields (FIRMWARE_CTRL/X_FIRMWARE_CTRL and + * DSDT/X_DSDT) could be a corrupted address field or it might indicate + * the presence of two FACS or two DSDT tables. + * + * November 2013: + * By default, as per the ACPICA specification, a valid 64-bit address is + * used regardless of the value of the 32-bit address. However, this + * behavior can be overridden via the acpi_gbl_use32_bit_fadt_addresses flag. + * + ******************************************************************************/ + +static u64 +acpi_tb_select_address(char *register_name, u32 address32, u64 address64) +{ + + if (!address64) { + + /* 64-bit address is zero, use 32-bit address */ + + return ((u64)address32); + } + + if (address32 && (address64 != (u64)address32)) { + + /* Address mismatch between 32-bit and 64-bit versions */ + + ACPI_BIOS_WARNING((AE_INFO, + "32/64X %s address mismatch in FADT: " + "0x%8.8X/0x%8.8X%8.8X, using %u-bit address", + register_name, address32, + ACPI_FORMAT_UINT64(address64), + acpi_gbl_use32_bit_fadt_addresses ? 32 : + 64)); + + /* 32-bit address override */ + + if (acpi_gbl_use32_bit_fadt_addresses) { + return ((u64)address32); + } + } + + /* Default is to use the 64-bit address */ + + return (address64); +} + +/******************************************************************************* + * * FUNCTION: acpi_tb_parse_fadt * * PARAMETERS: table_index - Index for the FADT @@ -268,15 +344,15 @@ void acpi_tb_parse_fadt(u32 table_index) /* Obtain the DSDT and FACS tables via their addresses within the FADT */ - acpi_tb_install_table((acpi_physical_address) acpi_gbl_FADT.Xdsdt, - ACPI_SIG_DSDT, ACPI_TABLE_INDEX_DSDT); + acpi_tb_install_fixed_table((acpi_physical_address) acpi_gbl_FADT.Xdsdt, + ACPI_SIG_DSDT, ACPI_TABLE_INDEX_DSDT); /* If Hardware Reduced flag is set, there is no FACS */ if (!acpi_gbl_reduced_hardware) { - acpi_tb_install_table((acpi_physical_address) acpi_gbl_FADT. - Xfacs, ACPI_SIG_FACS, - ACPI_TABLE_INDEX_FACS); + acpi_tb_install_fixed_table((acpi_physical_address) + acpi_gbl_FADT.Xfacs, ACPI_SIG_FACS, + ACPI_TABLE_INDEX_FACS); } } @@ -331,10 +407,6 @@ void acpi_tb_create_local_fadt(struct acpi_table_header *table, u32 length) acpi_tb_convert_fadt(); - /* Validate FADT values now, before we make any changes */ - - acpi_tb_validate_fadt(); - /* Initialize the global ACPI register structures */ acpi_tb_setup_fadt_registers(); @@ -344,66 +416,56 @@ void acpi_tb_create_local_fadt(struct acpi_table_header *table, u32 length) * * FUNCTION: acpi_tb_convert_fadt * - * PARAMETERS: None, uses acpi_gbl_FADT + * PARAMETERS: none - acpi_gbl_FADT is used. * * RETURN: None * * DESCRIPTION: Converts all versions of the FADT to a common internal format. - * Expand 32-bit addresses to 64-bit as necessary. + * Expand 32-bit addresses to 64-bit as necessary. Also validate + * important fields within the FADT. * - * NOTE: acpi_gbl_FADT must be of size (struct acpi_table_fadt), - * and must contain a copy of the actual FADT. + * NOTE: acpi_gbl_FADT must be of size (struct acpi_table_fadt), and must + * contain a copy of the actual BIOS-provided FADT. * * Notes on 64-bit register addresses: * * After this FADT conversion, later ACPICA code will only use the 64-bit "X" * fields of the FADT for all ACPI register addresses. * - * The 64-bit "X" fields are optional extensions to the original 32-bit FADT + * The 64-bit X fields are optional extensions to the original 32-bit FADT * V1.0 fields. Even if they are present in the FADT, they are optional and * are unused if the BIOS sets them to zero. Therefore, we must copy/expand - * 32-bit V1.0 fields if the corresponding X field is zero. + * 32-bit V1.0 fields to the 64-bit X fields if the the 64-bit X field is + * originally zero. * - * For ACPI 1.0 FADTs, all 32-bit address fields are expanded to the - * corresponding "X" fields in the internal FADT. + * For ACPI 1.0 FADTs (that contain no 64-bit addresses), all 32-bit address + * fields are expanded to the corresponding 64-bit X fields in the internal + * common FADT. * * For ACPI 2.0+ FADTs, all valid (non-zero) 32-bit address fields are expanded - * to the corresponding 64-bit X fields. For compatibility with other ACPI - * implementations, we ignore the 64-bit field if the 32-bit field is valid, - * regardless of whether the host OS is 32-bit or 64-bit. + * to the corresponding 64-bit X fields, if the 64-bit field is originally + * zero. Adhering to the ACPI specification, we completely ignore the 32-bit + * field if the 64-bit field is valid, regardless of whether the host OS is + * 32-bit or 64-bit. + * + * Possible additional checks: + * (acpi_gbl_FADT.pm1_event_length >= 4) + * (acpi_gbl_FADT.pm1_control_length >= 2) + * (acpi_gbl_FADT.pm_timer_length >= 4) + * Gpe block lengths must be multiple of 2 * ******************************************************************************/ static void acpi_tb_convert_fadt(void) { + char *name; struct acpi_generic_address *address64; u32 address32; + u8 length; + u8 flags; u32 i; /* - * Expand the 32-bit FACS and DSDT addresses to 64-bit as necessary. - * Later code will always use the X 64-bit field. Also, check for an - * address mismatch between the 32-bit and 64-bit address fields - * (FIRMWARE_CTRL/X_FIRMWARE_CTRL, DSDT/X_DSDT) which would indicate - * the presence of two FACS or two DSDT tables. - */ - if (!acpi_gbl_FADT.Xfacs) { - acpi_gbl_FADT.Xfacs = (u64) acpi_gbl_FADT.facs; - } else if (acpi_gbl_FADT.facs && - (acpi_gbl_FADT.Xfacs != (u64) acpi_gbl_FADT.facs)) { - ACPI_WARNING((AE_INFO, - "32/64 FACS address mismatch in FADT - two FACS tables!")); - } - - if (!acpi_gbl_FADT.Xdsdt) { - acpi_gbl_FADT.Xdsdt = (u64) acpi_gbl_FADT.dsdt; - } else if (acpi_gbl_FADT.dsdt && - (acpi_gbl_FADT.Xdsdt != (u64) acpi_gbl_FADT.dsdt)) { - ACPI_WARNING((AE_INFO, - "32/64 DSDT address mismatch in FADT - two DSDT tables!")); - } - - /* * For ACPI 1.0 FADTs (revision 1 or 2), ensure that reserved fields which * should be zero are indeed zero. This will workaround BIOSs that * inadvertently place values in these fields. @@ -421,119 +483,24 @@ static void acpi_tb_convert_fadt(void) acpi_gbl_FADT.boot_flags = 0; } - /* Update the local FADT table header length */ - - acpi_gbl_FADT.header.length = sizeof(struct acpi_table_fadt); - /* - * Expand the ACPI 1.0 32-bit addresses to the ACPI 2.0 64-bit "X" - * generic address structures as necessary. Later code will always use - * the 64-bit address structures. - * - * March 2009: - * We now always use the 32-bit address if it is valid (non-null). This - * is not in accordance with the ACPI specification which states that - * the 64-bit address supersedes the 32-bit version, but we do this for - * compatibility with other ACPI implementations. Most notably, in the - * case where both the 32 and 64 versions are non-null, we use the 32-bit - * version. This is the only address that is guaranteed to have been - * tested by the BIOS manufacturer. + * Now we can update the local FADT length to the length of the + * current FADT version as defined by the ACPI specification. + * Thus, we will have a common FADT internally. */ - for (i = 0; i < ACPI_FADT_INFO_ENTRIES; i++) { - address32 = *ACPI_ADD_PTR(u32, - &acpi_gbl_FADT, - fadt_info_table[i].address32); - - address64 = ACPI_ADD_PTR(struct acpi_generic_address, - &acpi_gbl_FADT, - fadt_info_table[i].address64); - - /* - * If both 32- and 64-bit addresses are valid (non-zero), - * they must match. - */ - if (address64->address && address32 && - (address64->address != (u64)address32)) { - ACPI_BIOS_ERROR((AE_INFO, - "32/64X address mismatch in FADT/%s: " - "0x%8.8X/0x%8.8X%8.8X, using 32", - fadt_info_table[i].name, address32, - ACPI_FORMAT_UINT64(address64-> - address))); - } - - /* Always use 32-bit address if it is valid (non-null) */ - - if (address32) { - /* - * Copy the 32-bit address to the 64-bit GAS structure. The - * Space ID is always I/O for 32-bit legacy address fields - */ - acpi_tb_init_generic_address(address64, - ACPI_ADR_SPACE_SYSTEM_IO, - *ACPI_ADD_PTR(u8, - &acpi_gbl_FADT, - fadt_info_table - [i].length), - (u64) address32, - fadt_info_table[i].name); - } - } -} - -/******************************************************************************* - * - * FUNCTION: acpi_tb_validate_fadt - * - * PARAMETERS: table - Pointer to the FADT to be validated - * - * RETURN: None - * - * DESCRIPTION: Validate various important fields within the FADT. If a problem - * is found, issue a message, but no status is returned. - * Used by both the table manager and the disassembler. - * - * Possible additional checks: - * (acpi_gbl_FADT.pm1_event_length >= 4) - * (acpi_gbl_FADT.pm1_control_length >= 2) - * (acpi_gbl_FADT.pm_timer_length >= 4) - * Gpe block lengths must be multiple of 2 - * - ******************************************************************************/ - -static void acpi_tb_validate_fadt(void) -{ - char *name; - struct acpi_generic_address *address64; - u8 length; - u32 i; + acpi_gbl_FADT.header.length = sizeof(struct acpi_table_fadt); /* - * Check for FACS and DSDT address mismatches. An address mismatch between - * the 32-bit and 64-bit address fields (FIRMWARE_CTRL/X_FIRMWARE_CTRL and - * DSDT/X_DSDT) would indicate the presence of two FACS or two DSDT tables. + * Expand the 32-bit FACS and DSDT addresses to 64-bit as necessary. + * Later ACPICA code will always use the X 64-bit field. */ - if (acpi_gbl_FADT.facs && - (acpi_gbl_FADT.Xfacs != (u64)acpi_gbl_FADT.facs)) { - ACPI_BIOS_WARNING((AE_INFO, - "32/64X FACS address mismatch in FADT - " - "0x%8.8X/0x%8.8X%8.8X, using 32", - acpi_gbl_FADT.facs, - ACPI_FORMAT_UINT64(acpi_gbl_FADT.Xfacs))); - - acpi_gbl_FADT.Xfacs = (u64)acpi_gbl_FADT.facs; - } + acpi_gbl_FADT.Xfacs = acpi_tb_select_address("FACS", + acpi_gbl_FADT.facs, + acpi_gbl_FADT.Xfacs); - if (acpi_gbl_FADT.dsdt && - (acpi_gbl_FADT.Xdsdt != (u64)acpi_gbl_FADT.dsdt)) { - ACPI_BIOS_WARNING((AE_INFO, - "32/64X DSDT address mismatch in FADT - " - "0x%8.8X/0x%8.8X%8.8X, using 32", - acpi_gbl_FADT.dsdt, - ACPI_FORMAT_UINT64(acpi_gbl_FADT.Xdsdt))); - - acpi_gbl_FADT.Xdsdt = (u64)acpi_gbl_FADT.dsdt; - } + acpi_gbl_FADT.Xdsdt = acpi_tb_select_address("DSDT", + acpi_gbl_FADT.dsdt, + acpi_gbl_FADT.Xdsdt); /* If Hardware Reduced flag is set, we are all done */ @@ -545,16 +512,95 @@ static void acpi_tb_validate_fadt(void) for (i = 0; i < ACPI_FADT_INFO_ENTRIES; i++) { /* - * Generate pointer to the 64-bit address, get the register - * length (width) and the register name + * Get the 32-bit and 64-bit addresses, as well as the register + * length and register name. */ + address32 = *ACPI_ADD_PTR(u32, + &acpi_gbl_FADT, + fadt_info_table[i].address32); + address64 = ACPI_ADD_PTR(struct acpi_generic_address, &acpi_gbl_FADT, fadt_info_table[i].address64); - length = - *ACPI_ADD_PTR(u8, &acpi_gbl_FADT, - fadt_info_table[i].length); + + length = *ACPI_ADD_PTR(u8, + &acpi_gbl_FADT, + fadt_info_table[i].length); + name = fadt_info_table[i].name; + flags = fadt_info_table[i].flags; + + /* + * Expand the ACPI 1.0 32-bit addresses to the ACPI 2.0 64-bit "X" + * generic address structures as necessary. Later code will always use + * the 64-bit address structures. + * + * November 2013: + * Now always use the 64-bit address if it is valid (non-zero), in + * accordance with the ACPI specification which states that a 64-bit + * address supersedes the 32-bit version. This behavior can be + * overridden by the acpi_gbl_use32_bit_fadt_addresses flag. + * + * During 64-bit address construction and verification, + * these cases are handled: + * + * Address32 zero, Address64 [don't care] - Use Address64 + * + * Address32 non-zero, Address64 zero - Copy/use Address32 + * Address32 non-zero == Address64 non-zero - Use Address64 + * Address32 non-zero != Address64 non-zero - Warning, use Address64 + * + * Override: if acpi_gbl_use32_bit_fadt_addresses is TRUE, and: + * Address32 non-zero != Address64 non-zero - Warning, copy/use Address32 + * + * Note: space_id is always I/O for 32-bit legacy address fields + */ + if (address32) { + if (!address64->address) { + + /* 64-bit address is zero, use 32-bit address */ + + acpi_tb_init_generic_address(address64, + ACPI_ADR_SPACE_SYSTEM_IO, + *ACPI_ADD_PTR(u8, + &acpi_gbl_FADT, + fadt_info_table + [i]. + length), + (u64)address32, + name, flags); + } else if (address64->address != (u64)address32) { + + /* Address mismatch */ + + ACPI_BIOS_WARNING((AE_INFO, + "32/64X address mismatch in FADT/%s: " + "0x%8.8X/0x%8.8X%8.8X, using %u-bit address", + name, address32, + ACPI_FORMAT_UINT64 + (address64->address), + acpi_gbl_use32_bit_fadt_addresses + ? 32 : 64)); + + if (acpi_gbl_use32_bit_fadt_addresses) { + + /* 32-bit address override */ + + acpi_tb_init_generic_address(address64, + ACPI_ADR_SPACE_SYSTEM_IO, + *ACPI_ADD_PTR + (u8, + &acpi_gbl_FADT, + fadt_info_table + [i]. + length), + (u64) + address32, + name, + flags); + } + } + } /* * For each extended field, check for length mismatch between the @@ -572,7 +618,7 @@ static void acpi_tb_validate_fadt(void) address64->bit_width)); } - if (fadt_info_table[i].type & ACPI_FADT_REQUIRED) { + if (fadt_info_table[i].flags & ACPI_FADT_REQUIRED) { /* * Field is required (Pm1a_event, Pm1a_control). * Both the address and length must be non-zero. @@ -586,7 +632,7 @@ static void acpi_tb_validate_fadt(void) address), length)); } - } else if (fadt_info_table[i].type & ACPI_FADT_SEPARATE_LENGTH) { + } else if (fadt_info_table[i].flags & ACPI_FADT_SEPARATE_LENGTH) { /* * Field is optional (Pm2_control, GPE0, GPE1) AND has its own * length field. If present, both the address and length must @@ -695,7 +741,7 @@ static void acpi_tb_setup_fadt_registers(void) (fadt_pm_info_table[i]. register_num * pm1_register_byte_width), - "PmRegisters"); + "PmRegisters", 0); } } } |