diff options
Diffstat (limited to 'drivers/acpi/acpica/tbfadt.c')
| -rw-r--r-- | drivers/acpi/acpica/tbfadt.c | 722 |
1 files changed, 722 insertions, 0 deletions
diff --git a/drivers/acpi/acpica/tbfadt.c b/drivers/acpi/acpica/tbfadt.c new file mode 100644 index 000000000..907edc5ed --- /dev/null +++ b/drivers/acpi/acpica/tbfadt.c @@ -0,0 +1,722 @@ +// SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0 +/****************************************************************************** + * + * Module Name: tbfadt - FADT table utilities + * + * Copyright (C) 2000 - 2020, Intel Corp. + * + *****************************************************************************/ + +#include <acpi/acpi.h> +#include "accommon.h" +#include "actables.h" + +#define _COMPONENT ACPI_TABLES +ACPI_MODULE_NAME("tbfadt") + +/* Local prototypes */ +static void +acpi_tb_init_generic_address(struct acpi_generic_address *generic_address, + u8 space_id, + u8 byte_width, + u64 address, const char *register_name, u8 flags); + +static void acpi_tb_convert_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 { + const char *name; + u16 address64; + u16 address32; + u16 length; + u8 default_length; + 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", + ACPI_FADT_OFFSET(xpm1a_event_block), + ACPI_FADT_OFFSET(pm1a_event_block), + ACPI_FADT_OFFSET(pm1_event_length), + ACPI_PM1_REGISTER_WIDTH * 2, /* Enable + Status register */ + ACPI_FADT_REQUIRED}, + + {"Pm1bEventBlock", + ACPI_FADT_OFFSET(xpm1b_event_block), + ACPI_FADT_OFFSET(pm1b_event_block), + ACPI_FADT_OFFSET(pm1_event_length), + ACPI_PM1_REGISTER_WIDTH * 2, /* Enable + Status register */ + ACPI_FADT_OPTIONAL}, + + {"Pm1aControlBlock", + ACPI_FADT_OFFSET(xpm1a_control_block), + ACPI_FADT_OFFSET(pm1a_control_block), + ACPI_FADT_OFFSET(pm1_control_length), + ACPI_PM1_REGISTER_WIDTH, + ACPI_FADT_REQUIRED}, + + {"Pm1bControlBlock", + ACPI_FADT_OFFSET(xpm1b_control_block), + ACPI_FADT_OFFSET(pm1b_control_block), + ACPI_FADT_OFFSET(pm1_control_length), + ACPI_PM1_REGISTER_WIDTH, + ACPI_FADT_OPTIONAL}, + + {"Pm2ControlBlock", + ACPI_FADT_OFFSET(xpm2_control_block), + ACPI_FADT_OFFSET(pm2_control_block), + ACPI_FADT_OFFSET(pm2_control_length), + ACPI_PM2_REGISTER_WIDTH, + ACPI_FADT_SEPARATE_LENGTH}, + + {"PmTimerBlock", + ACPI_FADT_OFFSET(xpm_timer_block), + ACPI_FADT_OFFSET(pm_timer_block), + ACPI_FADT_OFFSET(pm_timer_length), + ACPI_PM_TIMER_WIDTH, + ACPI_FADT_SEPARATE_LENGTH}, /* ACPI 5.0A: Timer is optional */ + + {"Gpe0Block", + ACPI_FADT_OFFSET(xgpe0_block), + ACPI_FADT_OFFSET(gpe0_block), + ACPI_FADT_OFFSET(gpe0_block_length), + 0, + 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_GPE_REGISTER} +}; + +#define ACPI_FADT_INFO_ENTRIES \ + (sizeof (fadt_info_table) / sizeof (struct acpi_fadt_info)) + +/* Table used to split Event Blocks into separate status/enable registers */ + +typedef struct acpi_fadt_pm_info { + struct acpi_generic_address *target; + u16 source; + u8 register_num; + +} acpi_fadt_pm_info; + +static struct acpi_fadt_pm_info fadt_pm_info_table[] = { + {&acpi_gbl_xpm1a_status, + ACPI_FADT_OFFSET(xpm1a_event_block), + 0}, + + {&acpi_gbl_xpm1a_enable, + ACPI_FADT_OFFSET(xpm1a_event_block), + 1}, + + {&acpi_gbl_xpm1b_status, + ACPI_FADT_OFFSET(xpm1b_event_block), + 0}, + + {&acpi_gbl_xpm1b_enable, + ACPI_FADT_OFFSET(xpm1b_event_block), + 1} +}; + +#define ACPI_FADT_PM_INFO_ENTRIES \ + (sizeof (fadt_pm_info_table) / sizeof (struct acpi_fadt_pm_info)) + +/******************************************************************************* + * + * FUNCTION: acpi_tb_init_generic_address + * + * PARAMETERS: generic_address - GAS struct to be initialized + * 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 + * + * DESCRIPTION: Initialize a Generic Address Structure (GAS) + * See the ACPI specification for a full description and + * definition of this structure. + * + ******************************************************************************/ + +static void +acpi_tb_init_generic_address(struct acpi_generic_address *generic_address, + u8 space_id, + u8 byte_width, + u64 address, const char *register_name, u8 flags) +{ + u8 bit_width; + + /* + * 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, (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; + } + + /* + * The 64-bit Address field is non-aligned in the byte packed + * GAS struct. + */ + ACPI_MOVE_64_TO_64(&generic_address->address, &address); + + /* All other fields are byte-wide */ + + generic_address->space_id = space_id; + generic_address->bit_width = bit_width; + generic_address->bit_offset = 0; + generic_address->access_width = 0; /* Access width ANY */ +} + +/******************************************************************************* + * + * 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: None + * + * RETURN: None + * + * DESCRIPTION: Initialize the FADT, DSDT and FACS tables + * (FADT contains the addresses of the DSDT and FACS) + * + ******************************************************************************/ + +void acpi_tb_parse_fadt(void) +{ + u32 length; + struct acpi_table_header *table; + struct acpi_table_desc *fadt_desc; + acpi_status status; + + /* + * The FADT has multiple versions with different lengths, + * and it contains pointers to both the DSDT and FACS tables. + * + * Get a local copy of the FADT and convert it to a common format + * Map entire FADT, assumed to be smaller than one page. + */ + fadt_desc = &acpi_gbl_root_table_list.tables[acpi_gbl_fadt_index]; + status = acpi_tb_get_table(fadt_desc, &table); + if (ACPI_FAILURE(status)) { + return; + } + length = fadt_desc->length; + + /* + * Validate the FADT checksum before we copy the table. Ignore + * checksum error as we want to try to get the DSDT and FACS. + */ + (void)acpi_tb_verify_checksum(table, length); + + /* Create a local copy of the FADT in common ACPI 2.0+ format */ + + acpi_tb_create_local_fadt(table, length); + + /* All done with the real FADT, unmap it */ + + acpi_tb_put_table(fadt_desc); + + /* Obtain the DSDT and FACS tables via their addresses within the FADT */ + + acpi_tb_install_standard_table((acpi_physical_address)acpi_gbl_FADT. + Xdsdt, + ACPI_TABLE_ORIGIN_INTERNAL_PHYSICAL, + FALSE, TRUE, &acpi_gbl_dsdt_index); + + /* If Hardware Reduced flag is set, there is no FACS */ + + if (!acpi_gbl_reduced_hardware) { + if (acpi_gbl_FADT.facs) { + acpi_tb_install_standard_table((acpi_physical_address) + acpi_gbl_FADT.facs, + ACPI_TABLE_ORIGIN_INTERNAL_PHYSICAL, + FALSE, TRUE, + &acpi_gbl_facs_index); + } + if (acpi_gbl_FADT.Xfacs) { + acpi_tb_install_standard_table((acpi_physical_address) + acpi_gbl_FADT.Xfacs, + ACPI_TABLE_ORIGIN_INTERNAL_PHYSICAL, + FALSE, TRUE, + &acpi_gbl_xfacs_index); + } + } +} + +/******************************************************************************* + * + * FUNCTION: acpi_tb_create_local_fadt + * + * PARAMETERS: table - Pointer to BIOS FADT + * length - Length of the table + * + * RETURN: None + * + * DESCRIPTION: Get a local copy of the FADT and convert it to a common format. + * Performs validation on some important FADT fields. + * + * NOTE: We create a local copy of the FADT regardless of the version. + * + ******************************************************************************/ + +void acpi_tb_create_local_fadt(struct acpi_table_header *table, u32 length) +{ + /* + * Check if the FADT is larger than the largest table that we expect + * (typically the current ACPI specification version). If so, truncate + * the table, and issue a warning. + */ + if (length > sizeof(struct acpi_table_fadt)) { + ACPI_BIOS_WARNING((AE_INFO, + "FADT (revision %u) is longer than %s length, " + "truncating length %u to %u", + table->revision, ACPI_FADT_CONFORMANCE, + length, + (u32)sizeof(struct acpi_table_fadt))); + } + + /* Clear the entire local FADT */ + + memset(&acpi_gbl_FADT, 0, sizeof(struct acpi_table_fadt)); + + /* Copy the original FADT, up to sizeof (struct acpi_table_fadt) */ + + memcpy(&acpi_gbl_FADT, table, + ACPI_MIN(length, sizeof(struct acpi_table_fadt))); + + /* Take a copy of the Hardware Reduced flag */ + + acpi_gbl_reduced_hardware = FALSE; + if (acpi_gbl_FADT.flags & ACPI_FADT_HW_REDUCED) { + acpi_gbl_reduced_hardware = TRUE; + } + + /* Convert the local copy of the FADT to the common internal format */ + + acpi_tb_convert_fadt(); + + /* Initialize the global ACPI register structures */ + + acpi_tb_setup_fadt_registers(); +} + +/******************************************************************************* + * + * FUNCTION: acpi_tb_convert_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. 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 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 + * 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 to the 64-bit X fields if the 64-bit X field is originally + * zero. + * + * 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, 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) +{ + const char *name; + struct acpi_generic_address *address64; + u32 address32; + u8 length; + u8 flags; + u32 i; + + /* + * 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. + * + * The ACPI 1.0 reserved fields that will be zeroed are the bytes located + * at offset 45, 55, 95, and the word located at offset 109, 110. + * + * Note: The FADT revision value is unreliable. Only the length can be + * trusted. + */ + if (acpi_gbl_FADT.header.length <= ACPI_FADT_V2_SIZE) { + acpi_gbl_FADT.preferred_profile = 0; + acpi_gbl_FADT.pstate_control = 0; + acpi_gbl_FADT.cst_control = 0; + acpi_gbl_FADT.boot_flags = 0; + } + + /* + * 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. + */ + acpi_gbl_FADT.header.length = sizeof(struct acpi_table_fadt); + + /* + * Expand the 32-bit DSDT addresses to 64-bit as necessary. + * Later ACPICA code will always use the X 64-bit field. + */ + 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 */ + + if (acpi_gbl_reduced_hardware) { + return; + } + + /* Examine all of the 64-bit extended address fields (X fields) */ + + for (i = 0; i < ACPI_FADT_INFO_ENTRIES; i++) { + /* + * 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); + + 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 + * + * No override: if acpi_gbl_use32_bit_fadt_addresses is FALSE, and: + * 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 zero - Copy/use Address32 + * Address32 non-zero == Address64 non-zero - Copy/use Address32 + * 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) { + 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)); + } + + /* + * For each extended field, check for length mismatch + * between the legacy length field and the corresponding + * 64-bit X length field. + * Note: If the legacy length field is > 0xFF bits, ignore + * this check. (GPE registers can be larger than the + * 64-bit GAS structure can accommodate, 0xFF bits). + */ + if ((ACPI_MUL_8(length) <= ACPI_UINT8_MAX) && + (address64->bit_width != + ACPI_MUL_8(length))) { + ACPI_BIOS_WARNING((AE_INFO, + "32/64X length mismatch in FADT/%s: %u/%u", + name, + ACPI_MUL_8(length), + address64-> + bit_width)); + } + } + + /* + * Hardware register access code always uses the 64-bit fields. + * So if the 64-bit field is zero or is to be overridden, + * initialize it with the 32-bit fields. + * Note that when the 32-bit address favor is specified, the + * 64-bit fields are always re-initialized so that + * access_size/bit_width/bit_offset fields can be correctly + * configured to the values to trigger a 32-bit compatible + * access mode in the hardware register access code. + */ + if (!address64->address + || acpi_gbl_use32_bit_fadt_addresses) { + acpi_tb_init_generic_address(address64, + ACPI_ADR_SPACE_SYSTEM_IO, + length, + (u64)address32, + name, flags); + } + } + + 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. + */ + if (!address64->address || !length) { + ACPI_BIOS_ERROR((AE_INFO, + "Required FADT field %s has zero address and/or length: " + "0x%8.8X%8.8X/0x%X", + name, + ACPI_FORMAT_UINT64(address64-> + address), + 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 + * be valid. + */ + if ((address64->address && !length) || + (!address64->address && length)) { + ACPI_BIOS_WARNING((AE_INFO, + "Optional FADT field %s has valid %s but zero %s: " + "0x%8.8X%8.8X/0x%X", name, + (length ? "Length" : + "Address"), + (length ? "Address" : + "Length"), + ACPI_FORMAT_UINT64 + (address64->address), + length)); + } + } + } +} + +/******************************************************************************* + * + * FUNCTION: acpi_tb_setup_fadt_registers + * + * PARAMETERS: None, uses acpi_gbl_FADT. + * + * RETURN: None + * + * DESCRIPTION: Initialize global ACPI PM1 register definitions. Optionally, + * force FADT register definitions to their default lengths. + * + ******************************************************************************/ + +static void acpi_tb_setup_fadt_registers(void) +{ + struct acpi_generic_address *target64; + struct acpi_generic_address *source64; + u8 pm1_register_byte_width; + u32 i; + + /* + * Optionally check all register lengths against the default values and + * update them if they are incorrect. + */ + if (acpi_gbl_use_default_register_widths) { + for (i = 0; i < ACPI_FADT_INFO_ENTRIES; i++) { + target64 = + ACPI_ADD_PTR(struct acpi_generic_address, + &acpi_gbl_FADT, + fadt_info_table[i].address64); + + /* + * If a valid register (Address != 0) and the (default_length > 0) + * (Not a GPE register), then check the width against the default. + */ + if ((target64->address) && + (fadt_info_table[i].default_length > 0) && + (fadt_info_table[i].default_length != + target64->bit_width)) { + ACPI_BIOS_WARNING((AE_INFO, + "Invalid length for FADT/%s: %u, using default %u", + fadt_info_table[i].name, + target64->bit_width, + fadt_info_table[i]. + default_length)); + + /* Incorrect size, set width to the default */ + + target64->bit_width = + fadt_info_table[i].default_length; + } + } + } + + /* + * Get the length of the individual PM1 registers (enable and status). + * Each register is defined to be (event block length / 2). Extra divide + * by 8 converts bits to bytes. + */ + pm1_register_byte_width = (u8) + ACPI_DIV_16(acpi_gbl_FADT.xpm1a_event_block.bit_width); + + /* + * Calculate separate GAS structs for the PM1x (A/B) Status and Enable + * registers. These addresses do not appear (directly) in the FADT, so it + * is useful to pre-calculate them from the PM1 Event Block definitions. + * + * The PM event blocks are split into two register blocks, first is the + * PM Status Register block, followed immediately by the PM Enable + * Register block. Each is of length (pm1_event_length/2) + * + * Note: The PM1A event block is required by the ACPI specification. + * However, the PM1B event block is optional and is rarely, if ever, + * used. + */ + + for (i = 0; i < ACPI_FADT_PM_INFO_ENTRIES; i++) { + source64 = + ACPI_ADD_PTR(struct acpi_generic_address, &acpi_gbl_FADT, + fadt_pm_info_table[i].source); + + if (source64->address) { + acpi_tb_init_generic_address(fadt_pm_info_table[i]. + target, source64->space_id, + pm1_register_byte_width, + source64->address + + (fadt_pm_info_table[i]. + register_num * + pm1_register_byte_width), + "PmRegisters", 0); + } + } +} |