edac_mce: Add an interface driver to report mce errors via edac

edac_mce module is an interface module that gets mcelog data and
forwards to any registered edac module that expects to receive data via
mce.

Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

diff --git a/arch/x86/kernel/cpu/mcheck/mce.c b/arch/x86/kernel/cpu/mcheck/mce.c
index 8a6f0af..6585ff0 100644 (file)
--- a/arch/x86/kernel/cpu/mcheck/mce.c
+++ b/arch/x86/kernel/cpu/mcheck/mce.c
@@ -36,6 +36,7 @@
 #include <linux/fs.h>
 #include <linux/mm.h>
 #include <linux/debugfs.h>
+#include <linux/edac_mce.h>
 
 #include <asm/processor.h>
 #include <asm/hw_irq.h>
@@ -168,6 +169,15 @@ void mce_log(struct mce *mce)
        for (;;) {
                entry = rcu_dereference_check_mce(mcelog.next);
                for (;;) {
+                       /*
+                        * If edac_mce is enabled, it will check the error type
+                        * and will process it, if it is a known error.
+                        * Otherwise, the error will be sent through mcelog
+                        * interface
+                        */
+                       if (edac_mce_parse(mce))
+                               return;
+
                        /*
                         * When the buffer fills up discard new entries.
                         * Assume that the earlier errors are the more

diff --git a/drivers/edac/Kconfig b/drivers/edac/Kconfig
index 391ddbf..5b7fbc5 100644 (file)
--- a/drivers/edac/Kconfig
+++ b/drivers/edac/Kconfig
@@ -69,6 +69,9 @@ config EDAC_MM_EDAC
          occurred so that a particular failing memory module can be
          replaced.  If unsure, select 'Y'.
 
+config EDAC_MCE
+       tristate
+
 config EDAC_AMD64
        tristate "AMD64 (Opteron, Athlon64) K8, F10h, F11h"
        depends on EDAC_MM_EDAC && K8_NB && X86_64 && PCI && EDAC_DECODE_MCE
@@ -169,9 +172,12 @@ config EDAC_I5400
 config EDAC_I7CORE
        tristate "Intel i7 Core (Nehalem) processors"
        depends on EDAC_MM_EDAC && PCI && X86
+       select EDAC_MCE
        help
          Support for error detection and correction the Intel
-         i7 Core (Nehalem) Integrated Memory Controller
+         i7 Core (Nehalem) Integrated Memory Controller that exists on
+         newer processors like i7 Core, i7 Core Extreme, Xeon 35xx
+         and Xeon 55xx processors.
 
 config EDAC_I82860
        tristate "Intel 82860"

diff --git a/drivers/edac/Makefile b/drivers/edac/Makefile
index b999619..ca6b1bb 100644 (file)
--- a/drivers/edac/Makefile
+++ b/drivers/edac/Makefile
@@ -8,6 +8,7 @@
 
 obj-$(CONFIG_EDAC)                     := edac_stub.o
 obj-$(CONFIG_EDAC_MM_EDAC)             += edac_core.o
+obj-$(CONFIG_EDAC_MCE)                 += edac_mce.o
 
 edac_core-objs := edac_mc.o edac_device.o edac_mc_sysfs.o edac_pci_sysfs.o
 edac_core-objs += edac_module.o edac_device_sysfs.o

diff --git a/drivers/edac/edac_mce.c b/drivers/edac/edac_mce.c
new file mode 100644 (file)
index 0000000..b1efa8e
--- /dev/null
+++ b/drivers/edac/edac_mce.c
@@ -0,0 +1,58 @@
+/* Provides edac interface to mcelog events
+ *
+ * This file may be distributed under the terms of the
+ * GNU General Public License version 2.
+ *
+ * Copyright (c) 2009 by:
+ *      Mauro Carvalho Chehab <mchehab@redhat.com>
+ *
+ * Red Hat Inc. http://www.redhat.com
+ */
+
+#include <linux/module.h>
+#include <linux/edac_mce.h>
+#include <asm/mce.h>
+
+int edac_mce_enabled;
+EXPORT_SYMBOL_GPL(edac_mce_enabled);
+
+
+/*
+ * Extension interface
+ */
+
+static LIST_HEAD(edac_mce_list);
+static DEFINE_MUTEX(edac_mce_lock);
+
+int edac_mce_register(struct edac_mce *edac_mce)
+{
+       mutex_lock(&edac_mce_lock);
+       list_add_tail(&edac_mce->list, &edac_mce_list);
+       mutex_unlock(&edac_mce_lock);
+       return 0;
+}
+EXPORT_SYMBOL(edac_mce_register);
+
+void edac_mce_unregister(struct edac_mce *edac_mce)
+{
+       mutex_lock(&edac_mce_lock);
+       list_del(&edac_mce->list);
+       mutex_unlock(&edac_mce_lock);
+}
+EXPORT_SYMBOL(edac_mce_unregister);
+
+
+
+int edac_mce_queue(struct mce *mce)
+{
+       struct edac_mce *edac_mce;
+
+       list_for_each_entry(edac_mce, &edac_mce_list, list) {
+               if (edac_mce->check_error(edac_mce->priv, mce))
+                       return 1;
+       }
+
+       /* Nobody queued the error */
+       return 0;
+}
+EXPORT_SYMBOL_GPL(edac_mce_queue);

diff --git a/include/linux/edac_mce.h b/include/linux/edac_mce.h
new file mode 100644 (file)
index 0000000..f974fc0
--- /dev/null
+++ b/include/linux/edac_mce.h
@@ -0,0 +1,31 @@
+/* Provides edac interface to mcelog events
+ *
+ * This file may be distributed under the terms of the
+ * GNU General Public License version 2.
+ *
+ * Copyright (c) 2009 by:
+ *      Mauro Carvalho Chehab <mchehab@redhat.com>
+ *
+ * Red Hat Inc. http://www.redhat.com
+ */
+
+#if defined(CONFIG_EDAC_MCE) || \
+                       (defined(CONFIG_EDAC_MCE_MODULE) && defined(MODULE))
+
+#include <asm/mce.h>
+#include <linux/list.h>
+
+struct edac_mce {
+       struct list_head list;
+
+       void *priv;
+       int (*check_error)(void *priv, struct mce *mce);
+};
+
+int edac_mce_register(struct edac_mce *edac_mce);
+void edac_mce_unregister(struct edac_mce *edac_mce);
+int edac_mce_parse(struct mce *mce);
+
+#else
+#define edac_mce_parse(mce) (0)
+#endif