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authorDave Jiang <djiang@mvista.com>2007-07-19 01:49:46 -0700
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2007-07-19 10:04:53 -0700
commitc0d121720220584bba2876b032e58a076b843fa1 (patch)
tree13ba24c6d875ded1494e1560f336b8551c663ef1 /drivers/edac/edac_module.c
parent28f96eeafc89643d411d54c258788a8573576127 (diff)
downloadlinux-c0d121720220584bba2876b032e58a076b843fa1.tar.bz2
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>
Diffstat (limited to 'drivers/edac/edac_module.c')
-rw-r--r--drivers/edac/edac_module.c24
1 files changed, 22 insertions, 2 deletions
diff --git a/drivers/edac/edac_module.c b/drivers/edac/edac_module.c
index 3cd3a236821c..89c96ecbf04e 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 @@ static void do_edac_check(void)
}
/*
+ * 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 @@ static int edac_kernel_thread(void *arg)
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;