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drivers/edac: add new nmi rescan

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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>
This commit is contained in:
Dave Jiang
2007-07-19 01:49:46 -07:00
committed by Linus Torvalds
parent 28f96eeafc
commit c0d1217202
11 changed files with 160 additions and 15 deletions
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24
drivers/edac/edac_module.c
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@ -1,6 +1,7 @@
#include <linux/freezer.h>
#include <linux/kthread.h>
#include <linux/edac.h>
#include "edac_mc.h"
#include "edac_module.h"
@ -101,6 +102,25 @@ static void do_edac_check(void)
edac_pci_do_parity_check();
}
/*
* 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
*/
@ -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;