[PATCH v3 2/3] mce: acpi/apei: Add a boot option to disable ff mode for corrected errors

Naveen N. Rao
2013-07-01T15:39:07Z

Add a boot option to disable firmware first mode for corrected errors.

Signed-off-by: Naveen N. Rao <naveen.n.rao@linux.vnet.ibm.com>
---
Documentation/x86/x86_64/boot-options.txt | 5 +++++
arch/x86/include/asm/acpi.h | 2 ++
arch/x86/kernel/acpi/boot.c | 5 +++++
drivers/acpi/apei/hest.c | 3 ++-
4 files changed, 14 insertions(+), 1 deletion(-)

diff --git a/Documentation/x86/x86_64/boot-options.txt b/Documentation/x86/x86_64/boot-options.txt
index e9e8ddb..1228b22 100644
--- a/Documentation/x86/x86_64/boot-options.txt
+++ b/Documentation/x86/x86_64/boot-options.txt
@@ -176,6 +176,11 @@ ACPI

acpi=noirq Don't route interrupts

+ acpi=nocmcff Disable firmware first mode for corrected errors. This
+ disables parsing the HEST CMC error source to check if
+ firmware has set the FF flag. This may result in
+ duplicate corrected error reports.
+
PCI

pci=off Don't use PCI
diff --git a/arch/x86/include/asm/acpi.h b/arch/x86/include/asm/acpi.h
index b31bf97..42db2b8 100644
--- a/arch/x86/include/asm/acpi.h
+++ b/arch/x86/include/asm/acpi.h
@@ -86,6 +86,7 @@ extern int acpi_pci_disabled;
extern int acpi_skip_timer_override;
extern int acpi_use_timer_override;
extern int acpi_fix_pin2_polarity;
+extern int acpi_disable_cmcff;

extern u8 acpi_sci_flags;
extern int acpi_sci_override_gsi;
@@ -168,6 +169,7 @@ static inline void arch_acpi_set_pdc_bits(u32 *buf)

#define acpi_lapic 0
#define acpi_ioapic 0
+#define acpi_disable_cmcff 0
static inline void acpi_noirq_set(void) { }
static inline void acpi_disable_pci(void) { }
static inline void disable_acpi(void) { }
diff --git a/arch/x86/kernel/acpi/boot.c b/arch/x86/kernel/acpi/boot.c
index 230c8ea..d1998d5 100644
--- a/arch/x86/kernel/acpi/boot.c
+++ b/arch/x86/kernel/acpi/boot.c
@@ -66,6 +66,7 @@ EXPORT_SYMBOL(acpi_pci_disabled);
int acpi_lapic;
int acpi_ioapic;
int acpi_strict;
+int acpi_disable_cmcff;

u8 acpi_sci_flags __initdata;
int acpi_sci_override_gsi __initdata;
@@ -1619,6 +1620,10 @@ static int __init parse_acpi(char *arg)
/* "acpi=copy_dsdt" copys DSDT */
else if (strcmp(arg, "copy_dsdt") == 0) {
acpi_gbl_copy_dsdt_locally = 1;
+ }
+ /* "acpi=nocmcff" disables FF mode for corrected errors */
+ else if (strcmp(arg, "nocmcff") == 0) {
+ acpi_disable_cmcff = 1;
} else {
/* Core will printk when we return error. */
return -EINVAL;
diff --git a/drivers/acpi/apei/hest.c b/drivers/acpi/apei/hest.c
index b108b11..5020245 100644
--- a/drivers/acpi/apei/hest.c
+++ b/drivers/acpi/apei/hest.c
@@ -262,7 +262,8 @@ void __init acpi_hest_init(void)
goto err;
}

- apei_hest_parse(hest_parse_cmc, NULL);
+ if (!acpi_disable_cmcff)
+ apei_hest_parse(hest_parse_cmc, NULL);

if (!ghes_disable) {
rc = apei_hest_parse(hest_parse_ghes_count, &ghes_count);