EDAC: Add an edac_report parameter to EDAC

This new parameter is used to control how to report HW error reporting,
especially for newer Intel platform, like Ivybridge-EX, which contains
an enhanced error decoding functionality in the firmware, i.e. eMCA.

Signed-off-by: Chen, Gong <gong.chen@linux.intel.com>
Acked-by: Tony Luck <tony.luck@intel.com>
Link: http://lkml.kernel.org/r/1386310630-12529-2-git-send-email-gong.chen@linux.intel.com
[ Boris: massage commit message. ]
Signed-off-by: Borislav Petkov <bp@suse.de>

3 files changed, 55 insertions, 0 deletions

diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt
index 50680a59a2ff..453092c822f1 100644
--- a/Documentation/kernel-parameters.txt
+++ b/Documentation/kernel-parameters.txt
@@ -881,6 +881,14 @@ bytes respectively. Such letter suffixes can also be entirely omitted.
 
                         The xen output can only be used by Xen PV guests.
 
+        edac_report=    [HW,EDAC] Control how to report EDAC event
+                        Format: {"on" | "off" | "force"}
+                        on: enable EDAC to report H/W event. May be overridden
+                        by other higher priority error reporting module.
+                        off: disable H/W event reporting through EDAC.
+                        force: enforce the use of EDAC to report H/W event.
+                        default: on.
+
         ekgdboc=        [X86,KGDB] Allow early kernel console debugging
                         ekgdboc=kbd
 
diff --git a/drivers/edac/edac_stub.c b/drivers/edac/edac_stub.c
index 351945fa2ecd..9d9e18aefaaa 100644
--- a/drivers/edac/edac_stub.c
+++ b/drivers/edac/edac_stub.c
@@ -29,6 +29,25 @@ EXPORT_SYMBOL_GPL(edac_err_assert);
 
 static atomic_t edac_subsys_valid = ATOMIC_INIT(0);
 
+int edac_report_status = EDAC_REPORTING_ENABLED;
+EXPORT_SYMBOL_GPL(edac_report_status);
+
+static int __init edac_report_setup(char *str)
+{
+        if (!str)
+                return -EINVAL;
+
+        if (!strncmp(str, "on", 2))
+                set_edac_report_status(EDAC_REPORTING_ENABLED);
+        else if (!strncmp(str, "off", 3))
+                set_edac_report_status(EDAC_REPORTING_DISABLED);
+        else if (!strncmp(str, "force", 5))
+                set_edac_report_status(EDAC_REPORTING_FORCE);
+
+        return 0;
+}
+__setup("edac_report=", edac_report_setup);
+
 /*
  * called to determine if there is an EDAC driver interested in
  * knowing an event (such as NMI) occurred
diff --git a/include/linux/edac.h b/include/linux/edac.h
index dbdffe8d4469..8e6c20af11a2 100644
--- a/include/linux/edac.h
+++ b/include/linux/edac.h
@@ -35,6 +35,34 @@ extern void edac_atomic_assert_error(void);
 extern struct bus_type *edac_get_sysfs_subsys(void);
 extern void edac_put_sysfs_subsys(void);
 
+enum {
+        EDAC_REPORTING_ENABLED,
+        EDAC_REPORTING_DISABLED,
+        EDAC_REPORTING_FORCE
+};
+
+extern int edac_report_status;
+#ifdef CONFIG_EDAC
+static inline int get_edac_report_status(void)
+{
+        return edac_report_status;
+}
+
+static inline void set_edac_report_status(int new)
+{
+        edac_report_status = new;
+}
+#else
+static inline int get_edac_report_status(void)
+{
+        return EDAC_REPORTING_DISABLED;
+}
+
+static inline void set_edac_report_status(int new)
+{
+}
+#endif
+
 static inline void opstate_init(void)
 {
         switch (edac_op_state) {