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authorHidetoshi Seto <seto.hidetoshi@jp.fujitsu.com>2009-06-11 16:06:07 +0900
committerIngo Molnar <mingo@elte.hu>2009-06-11 11:42:18 +0200
commit62fdac5913f71f8f200bd2c9bd59a02e9a1498e9 (patch)
tree9ba4cce91bf53198a295ca7909b027ca17b637fa /arch/x86/kernel/cpu/mcheck/mce.c
parent77e26cca20013e9352a8df86a54640543304a23a (diff)
x86, mce: Add boot options for corrected errors
This patch introduces three boot options (no_cmci, dont_log_ce and ignore_ce) to control handling for corrected errors. The "mce=no_cmci" boot option disables the CMCI feature. Since CMCI is a new feature so having boot controls to disable it will be a help if the hardware is misbehaving. The "mce=dont_log_ce" boot option disables logging for corrected errors. All reported corrected errors will be cleared silently. This option will be useful if you never care about corrected errors. The "mce=ignore_ce" boot option disables features for corrected errors, i.e. polling timer and cmci. All corrected events are not cleared and kept in bank MSRs. Usually this disablement is not recommended, however it will be a help if there are some conflict with the BIOS or hardware monitoring applications etc., that clears corrected events in banks instead of OS. [ And trivial cleanup (space -> tab) for doc is included. ] Signed-off-by: Hidetoshi Seto <seto.hidetoshi@jp.fujitsu.com> Reviewed-by: Andi Kleen <ak@linux.intel.com> LKML-Reference: <4A30ACDF.5030408@jp.fujitsu.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'arch/x86/kernel/cpu/mcheck/mce.c')
-rw-r--r--arch/x86/kernel/cpu/mcheck/mce.c19
1 files changed, 17 insertions, 2 deletions
diff --git a/arch/x86/kernel/cpu/mcheck/mce.c b/arch/x86/kernel/cpu/mcheck/mce.c
index 6a3127ecb5c..fabba15e455 100644
--- a/arch/x86/kernel/cpu/mcheck/mce.c
+++ b/arch/x86/kernel/cpu/mcheck/mce.c
@@ -84,6 +84,9 @@ static int rip_msr;
static int mce_bootlog = -1;
static int monarch_timeout = -1;
static int mce_panic_timeout;
+static int mce_dont_log_ce;
+int mce_cmci_disabled;
+int mce_ignore_ce;
int mce_ser;
static char trigger[128];
@@ -526,7 +529,7 @@ void machine_check_poll(enum mcp_flags flags, mce_banks_t *b)
* Don't get the IP here because it's unlikely to
* have anything to do with the actual error location.
*/
- if (!(flags & MCP_DONTLOG)) {
+ if (!(flags & MCP_DONTLOG) && !mce_dont_log_ce) {
mce_log(&m);
add_taint(TAINT_MACHINE_CHECK);
}
@@ -1307,6 +1310,9 @@ static void mce_init_timer(void)
struct timer_list *t = &__get_cpu_var(mce_timer);
int *n = &__get_cpu_var(next_interval);
+ if (mce_ignore_ce)
+ return;
+
*n = check_interval * HZ;
if (!*n)
return;
@@ -1517,7 +1523,10 @@ static struct miscdevice mce_log_device = {
};
/*
- * mce=off disables machine check
+ * mce=off Disables machine check
+ * mce=no_cmci Disables CMCI
+ * mce=dont_log_ce Clears corrected events silently, no log created for CEs.
+ * mce=ignore_ce Disables polling and CMCI, corrected events are not cleared.
* mce=TOLERANCELEVEL[,monarchtimeout] (number, see above)
* monarchtimeout is how long to wait for other CPUs on machine
* check, or 0 to not wait
@@ -1532,6 +1541,12 @@ static int __init mcheck_enable(char *str)
str++;
if (!strcmp(str, "off"))
mce_disabled = 1;
+ else if (!strcmp(str, "no_cmci"))
+ mce_cmci_disabled = 1;
+ else if (!strcmp(str, "dont_log_ce"))
+ mce_dont_log_ce = 1;
+ else if (!strcmp(str, "ignore_ce"))
+ mce_ignore_ce = 1;
else if (!strcmp(str, "bootlog") || !strcmp(str, "nobootlog"))
mce_bootlog = (str[0] == 'b');
else if (isdigit(str[0])) {