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authorLv Zheng <lv.zheng@intel.com>2015-07-01 09:43:18 +0300
committerRafael J. Wysocki <rafael.j.wysocki@intel.com>2015-07-02 00:17:52 +0300
commitf06147f9fbf134c0258bd53aebeb4ed5efea5a25 (patch)
treefc307fd7b60a4d96c7b64590171fff5affb09f24 /drivers/acpi
parentc04e1fb4396d27f18296db0f914760fa7fe8223a (diff)
downloadlinux-f06147f9fbf134c0258bd53aebeb4ed5efea5a25.tar.xz
ACPICA: Hardware: Enable firmware waking vector for both 32-bit and 64-bit FACS
ACPICA commit 368eb60778b27b6ae94d3658ddc902ca1342a963 ACPICA commit 70f62a80d65515e1285fdeeb50d94ee6f07df4bd ACPICA commit a04dbfa308a48ab0b2d10519c54a6c533c5c8949 ACPICA commit ebd544ed24c5a4faba11f265e228b7a821a729f5 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 Link: https://github.com/acpica/acpica/commit/a04dbfa3 Link: https://github.com/acpica/acpica/commit/ebd544ed 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> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Diffstat (limited to 'drivers/acpi')
-rw-r--r--drivers/acpi/acpica/acglobal.h2
-rw-r--r--drivers/acpi/acpica/hwxfsleep.c74
-rw-r--r--drivers/acpi/acpica/tbutils.c17
3 files changed, 73 insertions, 20 deletions
diff --git a/drivers/acpi/acpica/acglobal.h b/drivers/acpi/acpica/acglobal.h
index a0c478784314..53f96a370762 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 25cd9783b640..52dfd0d050fa 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_vectors(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);
/*
@@ -81,9 +88,10 @@ static struct acpi_sleep_functions acpi_sleep_dispatch[] = {
#if (!ACPI_REDUCED_HARDWARE)
/*******************************************************************************
*
- * FUNCTION: acpi_set_firmware_waking_vectors
+ * FUNCTION: acpi_hw_set_firmware_waking_vectors
*
- * 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
* mode entry point.
@@ -94,11 +102,12 @@ static struct acpi_sleep_functions acpi_sleep_dispatch[] = {
*
******************************************************************************/
-acpi_status
-acpi_set_firmware_waking_vectors(acpi_physical_address physical_address,
- acpi_physical_address physical_address64)
+static acpi_status
+acpi_hw_set_firmware_waking_vectors(struct acpi_table_facs *facs,
+ acpi_physical_address physical_address,
+ acpi_physical_address physical_address64)
{
- ACPI_FUNCTION_TRACE(acpi_set_firmware_waking_vectors);
+ ACPI_FUNCTION_TRACE(acpi_hw_set_firmware_waking_vectors);
/*
@@ -111,25 +120,66 @@ acpi_set_firmware_waking_vectors(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_vectors
+ *
+ * PARAMETERS: physical_address - 32-bit physical address of ACPI real mode
+ * entry point.
+ * physical_address64 - 64-bit physical address of ACPI protected
+ * mode entry point.
+ *
+ * RETURN: Status
+ *
+ * DESCRIPTION: Sets the firmware_waking_vector fields of the FACS
+ *
+ ******************************************************************************/
+
+acpi_status
+acpi_set_firmware_waking_vectors(acpi_physical_address physical_address,
+ acpi_physical_address physical_address64)
+{
+
+ ACPI_FUNCTION_TRACE(acpi_set_firmware_waking_vectors);
+
+ /* If Hardware Reduced flag is set, there is no FACS */
+
+ if (acpi_gbl_reduced_hardware) {
+ return_ACPI_STATUS (AE_OK);
+ }
+
+ if (acpi_gbl_facs32) {
+ (void)acpi_hw_set_firmware_waking_vectors(acpi_gbl_facs32,
+ physical_address,
+ physical_address64);
+ }
+ if (acpi_gbl_facs64) {
+ (void)acpi_hw_set_firmware_waking_vectors(acpi_gbl_facs64,
+ physical_address,
+ physical_address64);
+ }
+
+ return_ACPI_STATUS(AE_OK);
+}
+
ACPI_EXPORT_SYMBOL(acpi_set_firmware_waking_vectors)
/*******************************************************************************
diff --git a/drivers/acpi/acpica/tbutils.c b/drivers/acpi/acpica/tbutils.c
index 2fb1afaacc6d..2bb6a117c840 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 */
@@ -81,18 +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));
+ &acpi_gbl_facs64));
- if (acpi_gbl_use32_bit_facs_addresses) {
- acpi_gbl_FACS = facs32 ? facs32 : facs64;
- } else {
- acpi_gbl_FACS = facs64 ? facs64 : facs32;
+ if (acpi_gbl_facs64
+ && (!acpi_gbl_facs32 || !acpi_gbl_use32_bit_facs_addresses)) {
+ acpi_gbl_FACS = acpi_gbl_facs64;
+ } else if (acpi_gbl_facs32) {
+ acpi_gbl_FACS = acpi_gbl_facs32;
}
+ /* If there is no FACS, just continue. There was already an error msg */
+
return (AE_OK);
}
#endif /* !ACPI_REDUCED_HARDWARE */