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

Commit Message

Naveen N. Rao July 1, 2013, 3:38 p.m. UTC

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


Signed-off-by: Naveen N. Rao <[e-mail]>
---
 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(-)


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Comments

Borislav Petkov July 1, 2013, 10:49 p.m. UTC | #1

On Mon, Jul 01, 2013 at 09:08:54PM +0530, Naveen N. Rao wrote:
> Add a boot option to disable firmware first mode for corrected errors.
> 
> 
> Signed-off-by: Naveen N. Rao <[e-mail]>

Acked-by: Borislav Petkov <[e-mail]>

Patch

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);