drivers/edac: add new nmi rescan
Provides a way for NMI reported errors on x86 to notify the EDAC
subsystem pending ECC errors by writing to a software state variable.
Here's the reworked patch. I added an EDAC stub to the kernel so we can
have variables that are in the kernel even if EDAC is a module. I also
implemented the idea of using the chip driver to select error detection
mode via module parameter and eliminate the kernel compile option.
Please review/test. Thx!
Also, I only made changes to some of the chipset drivers since I am
unfamiliar with the other ones. We can add similar changes as we go.
Signed-off-by: Dave Jiang <djiang@mvista.com>
Signed-off-by: Douglas Thompson <dougthompson@xmission.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
diff --git a/drivers/edac/edac_module.c b/drivers/edac/edac_module.c
index 3cd3a23..89c96ec 100644
--- a/drivers/edac/edac_module.c
+++ b/drivers/edac/edac_module.c
@@ -1,6 +1,7 @@
#include <linux/freezer.h>
#include <linux/kthread.h>
+#include <linux/edac.h>
#include "edac_mc.h"
#include "edac_module.h"
@@ -102,6 +103,25 @@
}
/*
+ * handler for EDAC to check if NMI type handler has asserted interrupt
+ */
+static int edac_assert_error_check_and_clear(void)
+{
+ int vreg;
+
+ if(edac_op_state == EDAC_OPSTATE_POLL)
+ return 1;
+
+ vreg = atomic_read(&edac_err_assert);
+ if(vreg) {
+ atomic_set(&edac_err_assert, 0);
+ return 1;
+ }
+
+ return 0;
+}
+
+/*
* Action thread for EDAC to perform the POLL operations
*/
static int edac_kernel_thread(void *arg)
@@ -109,8 +129,8 @@
int msec;
while (!kthread_should_stop()) {
-
- do_edac_check();
+ if(edac_assert_error_check_and_clear())
+ do_edac_check();
/* goto sleep for the interval */
msec = (HZ * edac_get_poll_msec()) / 1000;