[PATCH v2 05/28] ACPICA: Hardware: Enable firmware waking vector for both 32-bit and 64-bit FACS.

Lv Zheng
2015-06-24T03:03:17Z

ACPICA commit 368eb60778b27b6ae94d3658ddc902ca1342a963
ACPICA commit 70f62a80d65515e1285fdeeb50d94ee6f07df4bd

The following commit is reported to have broken s2ram on some platforms:
Commit: 0249ed2444d65d65fc3f3f64f398f1ad0b7e54cd
ACPICA: Add option to favor 32-bit FADT addresses.
The platform reports 2 FACS tables (which is not allowed by ACPI
specification) and the new 32-bit address favor rule forces OSPMs to use
the FACS table reported via FADT's X_FIRMWARE_CTRL field.

The root cause of the reported bug might be one of the followings:
1. BIOS may favor the 64-bit firmware waking vector address when the
version of the FACS is greater than 0 and Linux currently only supports
resuming from the real mode, so the 64-bit firmware waking vector has
never been set and might be invalid to BIOS while the commit enables
higher version FACS.
2. BIOS may favor the FACS reported via the "FIRMWARE_CTRL" field in the
FADT while the commit doesn't set the firmware waking vector address of
the FACS reported by "FIRMWARE_CTRL", it only sets the firware waking
vector address of the FACS reported by "X_FIRMWARE_CTRL".

This patch excludes the cases that can trigger the bugs caused by the root
cause 2.

There is no handshaking mechanism can be used by OSPM to tell BIOS which
FACS is currently used. Thus the FACS reported by "FIRMWARE_CTRL" may still
be used by BIOS and the 0 value of the 32-bit firmware waking vector might
trigger such failure.

This patch enables the firmware waking vectors for both 32bit/64bit FACS
tables in order to ensure we can exclude the cases that trigger the bugs
caused by the root cause 2. The exclusion is split into 2 commits so that
if it turns out not to be necessary, this single commit can be reverted
without affecting the useful one. Lv Zheng, Bob Moore.

Link: https://bugzilla.kernel.org/show_bug.cgi?id=74021
Link: https://github.com/acpica/acpica/commit/368eb607
Link: https://github.com/acpica/acpica/commit/70f62a80
Reported-and-tested-by: Oswald Buddenhagen <ossi@kde.org>
Signed-off-by: Lv Zheng <lv.zheng@intel.com>
Signed-off-by: Bob Moore <robert.moore@intel.com>
---
drivers/acpi/acpica/acglobal.h | 2 ++
drivers/acpi/acpica/hwxfsleep.c | 74 ++++++++++++++++++++++++++++++++-------
drivers/acpi/acpica/tbutils.c | 14 ++++----
3 files changed, 71 insertions(+), 19 deletions(-)

diff --git a/drivers/acpi/acpica/acglobal.h b/drivers/acpi/acpica/acglobal.h
index a0c4787..53f96a3 100644
--- a/drivers/acpi/acpica/acglobal.h
+++ b/drivers/acpi/acpica/acglobal.h
@@ -61,6 +61,8 @@ ACPI_GLOBAL(struct acpi_table_header, acpi_gbl_original_dsdt_header);

#if (!ACPI_REDUCED_HARDWARE)
ACPI_GLOBAL(struct acpi_table_facs *, acpi_gbl_FACS);
+ACPI_GLOBAL(struct acpi_table_facs *, acpi_gbl_facs32);
+ACPI_GLOBAL(struct acpi_table_facs *, acpi_gbl_facs64);

#endif /* !ACPI_REDUCED_HARDWARE */

diff --git a/drivers/acpi/acpica/hwxfsleep.c b/drivers/acpi/acpica/hwxfsleep.c
index c67cd32..e273b2e 100644
--- a/drivers/acpi/acpica/hwxfsleep.c
+++ b/drivers/acpi/acpica/hwxfsleep.c
@@ -50,6 +50,13 @@
ACPI_MODULE_NAME("hwxfsleep")

/* Local prototypes */
+#if (!ACPI_REDUCED_HARDWARE)
+static acpi_status
+acpi_hw_set_firmware_waking_vector(struct acpi_table_facs *facs,
+ acpi_physical_address physical_address,
+ acpi_physical_address physical_address64);
+#endif
+
static acpi_status acpi_hw_sleep_dispatch(u8 sleep_state, u32 function_id);

/*
@@ -79,9 +86,10 @@ static struct acpi_sleep_functions acpi_sleep_dispatch[] = {
#if (!ACPI_REDUCED_HARDWARE)
/*******************************************************************************
*
- * FUNCTION: acpi_set_firmware_waking_vector
+ * FUNCTION: acpi_hw_set_firmware_waking_vector
*
- * PARAMETERS: physical_address - 32-bit physical address of ACPI real mode
+ * PARAMETERS: facs - Pointer to FACS table
+ * physical_address - 32-bit physical address of ACPI real mode
* entry point
* physical_address64 - 64-bit physical address of ACPI protected
* entry point
@@ -92,11 +100,12 @@ static struct acpi_sleep_functions acpi_sleep_dispatch[] = {
*
******************************************************************************/

-acpi_status
-acpi_set_firmware_waking_vector(acpi_physical_address physical_address,
- acpi_physical_address physical_address64)
+static acpi_status
+acpi_hw_set_firmware_waking_vector(struct acpi_table_facs *facs,
+ acpi_physical_address physical_address,
+ acpi_physical_address physical_address64)
{
- ACPI_FUNCTION_TRACE(acpi_set_firmware_waking_vector);
+ ACPI_FUNCTION_TRACE(acpi_hw_set_firmware_waking_vector);

/*
@@ -109,25 +118,66 @@ acpi_set_firmware_waking_vector(acpi_physical_address physical_address,

/* Set the 32-bit vector */

- acpi_gbl_FACS->firmware_waking_vector = (u32)physical_address;
+ facs->firmware_waking_vector = (u32)physical_address;

- if (acpi_gbl_FACS->length > 32) {
- if (acpi_gbl_FACS->version >= 1) {
+ if (facs->length > 32) {
+ if (facs->version >= 1) {

/* Set the 64-bit vector */

- acpi_gbl_FACS->xfirmware_waking_vector =
- physical_address64;
+ facs->xfirmware_waking_vector = physical_address64;
} else {
/* Clear the 64-bit vector if it exists */

- acpi_gbl_FACS->xfirmware_waking_vector = 0;
+ facs->xfirmware_waking_vector = 0;
}
}

return_ACPI_STATUS(AE_OK);
}

+/*******************************************************************************
+ *
+ * FUNCTION: acpi_set_firmware_waking_vector
+ *
+ * PARAMETERS: physical_address - 32-bit physical address of ACPI real mode
+ * entry point
+ * physical_address64 - 64-bit physical address of ACPI protected
+ * entry point
+ *
+ * RETURN: Status
+ *
+ * DESCRIPTION: Sets the firmware_waking_vector fields of the FACS
+ *
+ ******************************************************************************/
+
+acpi_status
+acpi_set_firmware_waking_vector(acpi_physical_address physical_address,
+ acpi_physical_address physical_address64)
+{
+
+ ACPI_FUNCTION_TRACE(acpi_set_firmware_waking_vector);
+
+ /* If Hardware Reduced flag is set, there is no FACS */
+
+ if (acpi_gbl_reduced_hardware) {
+ return (AE_OK);
+ }
+
+ if (acpi_gbl_facs32) {
+ (void)acpi_hw_set_firmware_waking_vector(acpi_gbl_facs32,
+ physical_address,
+ physical_address64);
+ }
+ if (acpi_gbl_facs64) {
+ (void)acpi_hw_set_firmware_waking_vector(acpi_gbl_facs64,
+ physical_address,
+ physical_address64);
+ }
+
+ return_ACPI_STATUS(AE_OK);
+}
+
ACPI_EXPORT_SYMBOL(acpi_set_firmware_waking_vector)

/*******************************************************************************
diff --git a/drivers/acpi/acpica/tbutils.c b/drivers/acpi/acpica/tbutils.c
index a4e6dab..6a6c5be 100644
--- a/drivers/acpi/acpica/tbutils.c
+++ b/drivers/acpi/acpica/tbutils.c
@@ -68,8 +68,6 @@ acpi_tb_get_root_table_entry(u8 *table_entry, u32 table_entry_size);

acpi_status acpi_tb_initialize_facs(void)
{
- struct acpi_table_facs *facs32;
- struct acpi_table_facs *facs64;

/* If Hardware Reduced flag is set, there is no FACS */

@@ -81,19 +79,21 @@ acpi_status acpi_tb_initialize_facs(void)
(void)acpi_get_table_by_index(ACPI_TABLE_INDEX_FACS,
ACPI_CAST_INDIRECT_PTR(struct
acpi_table_header,
- &facs32));
+ &acpi_gbl_facs32));
(void)acpi_get_table_by_index(ACPI_TABLE_INDEX_X_FACS,
ACPI_CAST_INDIRECT_PTR(struct
acpi_table_header,
- &facs64));
- if (!facs32 && !facs64) {
+ &acpi_gbl_facs64));
+ if (!acpi_gbl_facs32 && !acpi_gbl_facs64) {
return (AE_NO_MEMORY);
}

if (acpi_gbl_use32_bit_facs_addresses) {
- acpi_gbl_FACS = facs32 ? facs32 : facs64;
+ acpi_gbl_FACS =
+ acpi_gbl_facs32 ? acpi_gbl_facs32 : acpi_gbl_facs64;
} else {
- acpi_gbl_FACS = facs64 ? facs64 : facs32;
+ acpi_gbl_FACS =
+ acpi_gbl_facs64 ? acpi_gbl_facs64 : acpi_gbl_facs32;
}

return (AE_OK);
--
1.7.10