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Date: Mon, 12 May 2014 02:11:48 +0200
From: "Rafael J. Wysocki" <rjw@...ysocki.net>
To: ACPI Devel Maling List <linux-acpi@...r.kernel.org>
Cc: Lv Zheng <lv.zheng@...el.com>,
Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
Oswald Buddenhagen <ossi@....org>
Subject: [PATCH] ACPICA: Revert "ACPICA: Add option to favor 32-bit FADT addresses."
From: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
Revert commit 0249ed2444d6 (ACPICA: Add option to favor 32-bit FADT
addresses.) that breaks resume from system suspend on the Intel DP45SG
board.
Fixes: 0249ed2444d6 (ACPICA: Add option to favor 32-bit FADT addresses.)
References: https://bugzilla.kernel.org/show_bug.cgi?id=74021
Reported-and-tested-by: Oswald Buddenhagen <ossi@....org>
Cc: 3.14+ <stable@...r.kernel.org> # 3.14+
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
---
drivers/acpi/acpica/acglobal.h | 10 --
drivers/acpi/acpica/tbfadt.c | 335 +++++++++++++++++++----------------------
include/acpi/acpixf.h | 1 -
3 files changed, 152 insertions(+), 194 deletions(-)
diff --git a/drivers/acpi/acpica/acglobal.h b/drivers/acpi/acpica/acglobal.h
index 49bbc71fad54..72578a4b8212 100644
--- a/drivers/acpi/acpica/acglobal.h
+++ b/drivers/acpi/acpica/acglobal.h
@@ -136,16 +136,6 @@ ACPI_INIT_GLOBAL(u8, acpi_gbl_copy_dsdt_locally, FALSE);
ACPI_INIT_GLOBAL(u8, acpi_gbl_do_not_use_xsdt, FALSE);
/*
- * Optionally use 32-bit FADT addresses if and when there is a conflict
- * (address mismatch) between the 32-bit and 64-bit versions of the
- * address. Although ACPICA adheres to the ACPI specification which
- * requires the use of the corresponding 64-bit address if it is non-zero,
- * some machines have been found to have a corrupted non-zero 64-bit
- * address. Default is FALSE, do not favor the 32-bit addresses.
- */
-ACPI_INIT_GLOBAL(u8, acpi_gbl_use32_bit_fadt_addresses, FALSE);
-
-/*
* Optionally truncate I/O addresses to 16 bits. Provides compatibility
* with other ACPI implementations. NOTE: During ACPICA initialization,
* this value is set to TRUE if any Windows OSI strings have been
diff --git a/drivers/acpi/acpica/tbfadt.c b/drivers/acpi/acpica/tbfadt.c
index ec14588254d4..6dd5c590e0bb 100644
--- a/drivers/acpi/acpica/tbfadt.c
+++ b/drivers/acpi/acpica/tbfadt.c
@@ -56,10 +56,9 @@ acpi_tb_init_generic_address(struct acpi_generic_address *generic_address,
static void acpi_tb_convert_fadt(void);
-static void acpi_tb_setup_fadt_registers(void);
+static void acpi_tb_validate_fadt(void);
-static u64
-acpi_tb_select_address(char *register_name, u32 address32, u64 address64);
+static void acpi_tb_setup_fadt_registers(void);
/* Table for conversion of FADT to common internal format and FADT validation */
@@ -176,7 +175,6 @@ 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
*
@@ -222,68 +220,6 @@ 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
@@ -395,6 +331,10 @@ 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();
@@ -404,55 +344,66 @@ void acpi_tb_create_local_fadt(struct acpi_table_header *table, u32 length)
*
* FUNCTION: acpi_tb_convert_fadt
*
- * PARAMETERS: none - acpi_gbl_FADT is used.
+ * PARAMETERS: None, uses acpi_gbl_FADT
*
* 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.
+ * Expand 32-bit addresses to 64-bit as necessary.
*
- * NOTE: acpi_gbl_FADT must be of size (struct acpi_table_fadt), and must
- * contain a copy of the actual BIOS-provided FADT.
+ * NOTE: acpi_gbl_FADT must be of size (struct acpi_table_fadt),
+ * and must contain a copy of the actual 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 to the 64-bit X fields if the the 64-bit X field is
- * originally zero.
+ * 32-bit V1.0 fields if the corresponding X field is 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 1.0 FADTs, all 32-bit address fields are expanded to the
+ * corresponding "X" fields in the internal 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
+ * 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.
*
******************************************************************************/
static void acpi_tb_convert_fadt(void)
{
- char *name;
struct acpi_generic_address *address64;
u32 address32;
- u8 length;
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.
@@ -470,24 +421,119 @@ 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);
+
/*
- * 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.
+ * 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.
*/
- acpi_gbl_FADT.header.length = sizeof(struct acpi_table_fadt);
+ 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;
/*
- * Expand the 32-bit FACS and DSDT addresses to 64-bit as necessary.
- * Later ACPICA code will always use the X 64-bit field.
+ * 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.
*/
- acpi_gbl_FADT.Xfacs = acpi_tb_select_address("FACS",
- acpi_gbl_FADT.facs,
- acpi_gbl_FADT.Xfacs);
+ 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;
+ }
+
+ 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 = acpi_tb_select_address("DSDT",
- acpi_gbl_FADT.dsdt,
- acpi_gbl_FADT.Xdsdt);
+ acpi_gbl_FADT.Xdsdt = (u64)acpi_gbl_FADT.dsdt;
+ }
/* If Hardware Reduced flag is set, we are all done */
@@ -499,95 +545,18 @@ static void acpi_tb_convert_fadt(void)
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.
+ * Generate pointer to the 64-bit address, get the register
+ * length (width) and the 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;
/*
- * 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);
- } 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);
- }
- }
- }
-
- /*
* 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
diff --git a/include/acpi/acpixf.h b/include/acpi/acpixf.h
index 44f5e9749601..40d1bc88cc14 100644
--- a/include/acpi/acpixf.h
+++ b/include/acpi/acpixf.h
@@ -82,7 +82,6 @@ extern u8 acpi_gbl_enable_interpreter_slack;
extern u32 acpi_gbl_trace_flags;
extern acpi_name acpi_gbl_trace_method_name;
extern u8 acpi_gbl_truncate_io_addresses;
-extern u8 acpi_gbl_use32_bit_fadt_addresses;
extern u8 acpi_gbl_use_default_register_widths;
/*
--
1.8.4.5
--
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