[tip:x86/urgent] x86: EDAC: carve out AMD MCE decoding logic

tip-bot for Borislav Petkov
2009-10-02T14:02:42Z

Commit-ID: 0d18b2e34bd1ad8f5bd3f3a17b5e7df132e511a9
Gitweb: http://git.kernel.org/tip/0d18b2e34bd1ad8f5bd3f3a17b5e7df132e511a9
Author: Borislav Petkov <borislav.petkov@amd.com>
AuthorDate: Fri, 2 Oct 2009 15:31:48 +0200
Committer: Ingo Molnar <mingo@elte.hu>
CommitDate: Fri, 2 Oct 2009 15:42:19 +0200

x86: EDAC: carve out AMD MCE decoding logic

This converts the MCE decoding logic into a standalone config
option which can be built-in or a module, the first one being the
default for MCEs happening early on in the boot process.

This, beyond being separated in a cleaner way, also saves RAM by
making the decoding logic modular.

Signed-off-by: Borislav Petkov <borislav.petkov@amd.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Andi Kleen <andi@firstfloor.org>
LKML-Reference: <20091002133148.GD28682@aftab>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

---
drivers/edac/Kconfig | 14 +++++++++++++-
drivers/edac/Makefile | 5 +----
drivers/edac/edac_mce_amd.c | 19 ++++++++++++++++++-
3 files changed, 32 insertions(+), 6 deletions(-)

diff --git a/drivers/edac/Kconfig b/drivers/edac/Kconfig
index 02127e5..55c9c59 100644
--- a/drivers/edac/Kconfig
+++ b/drivers/edac/Kconfig
@@ -47,6 +47,18 @@ config EDAC_DEBUG_VERBOSE
Source file name and line number where debugging message
printed will be added to debugging message.

+ config EDAC_DECODE_MCE
+ tristate "Decode MCEs in human-readable form (only on AMD for now)"
+ depends on CPU_SUP_AMD && X86_MCE
+ default y
+ ---help---
+ Enable this option if you want to decode Machine Check Exceptions
+ occuring on your machine in human-readable form.
+
+ You should definitely say Y here in case you want to decode MCEs
+ which occur really early upon boot, before the module infrastructure
+ has been initialized.
+
config EDAC_MM_EDAC
tristate "Main Memory EDAC (Error Detection And Correction) reporting"
help
@@ -59,7 +71,7 @@ config EDAC_MM_EDAC

config EDAC_AMD64
tristate "AMD64 (Opteron, Athlon64) K8, F10h, F11h"
- depends on EDAC_MM_EDAC && K8_NB && X86_64 && PCI && CPU_SUP_AMD
+ depends on EDAC_MM_EDAC && K8_NB && X86_64 && PCI && EDAC_DECODE_MCE
help
Support for error detection and correction on the AMD 64
Families of Memory Controllers (K8, F10h and F11h)
diff --git a/drivers/edac/Makefile b/drivers/edac/Makefile
index 8701cd7..bc5dc23 100644
--- a/drivers/edac/Makefile
+++ b/drivers/edac/Makefile
@@ -6,7 +6,6 @@
# GNU General Public License.
#

-
obj-$(CONFIG_EDAC) := edac_stub.o
obj-$(CONFIG_EDAC_MM_EDAC) += edac_core.o

@@ -17,9 +16,7 @@ ifdef CONFIG_PCI
edac_core-objs += edac_pci.o edac_pci_sysfs.o
endif

-ifdef CONFIG_CPU_SUP_AMD
-obj-$(CONFIG_X86_MCE) += edac_mce_amd.o
-endif
+obj-$(CONFIG_EDAC_DECODE_MCE) += edac_mce_amd.o

obj-$(CONFIG_EDAC_AMD76X) += amd76x_edac.o
obj-$(CONFIG_EDAC_CPC925) += cpc925_edac.o
diff --git a/drivers/edac/edac_mce_amd.c b/drivers/edac/edac_mce_amd.c
index 83a01a1..713ed7d 100644
--- a/drivers/edac/edac_mce_amd.c
+++ b/drivers/edac/edac_mce_amd.c
@@ -3,6 +3,7 @@

static bool report_gart_errors;
static void (*nb_bus_decoder)(int node_id, struct err_regs *regs);
+static void (*orig_mce_callback)(struct mce *m);

void amd_report_gart_errors(bool v)
{
@@ -427,9 +428,25 @@ static int __init mce_amd_init(void)
* We can decode MCEs for Opteron and later CPUs:
*/
if ((boot_cpu_data.x86_vendor == X86_VENDOR_AMD) &&
- (boot_cpu_data.x86 >= 0xf))
+ (boot_cpu_data.x86 >= 0xf)) {
+ /* safe the default decode mce callback */
+ orig_mce_callback = x86_mce_decode_callback;
+
x86_mce_decode_callback = amd_decode_mce;
+ }

return 0;
}
early_initcall(mce_amd_init);
+
+#ifdef MODULE
+static void __exit mce_amd_exit(void)
+{
+ x86_mce_decode_callback = orig_mce_callback;
+}
+
+MODULE_DESCRIPTION("AMD MCE decoder");
+MODULE_ALIAS("edac-mce-amd");
+MODULE_LICENSE("GPL");
+module_exit(mce_amd_exit);
+#endif