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x86/mce: Add mce=print_all option 

Sometimes, when logs are getting lost, it's nice to just
have everything dumped to the serial console.

Signed-off-by: Tony Luck <tony.luck@intel.com>
Signed-off-by: Borislav Petkov <bp@suse.de>
Tested-by: Tony Luck <tony.luck@intel.com>
Link: https://lkml.kernel.org/r/20200214222720.13168-7-tony.luck@intel.com
This commit is contained in:
Tony Luck 2020-02-14 14:27:19 -08:00 committed by Borislav Petkov
parent 925946cfa7
commit 4350564694
2 changed files with 7 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

7
arch/x86/kernel/cpu/mce/core.c
View File

@ -591,7 +591,7 @@ static int mce_default_notifier(struct notifier_block *nb, unsigned long val,
if (!m)
return NOTIFY_DONE;
if (!m->kflags)
if (mca_cfg.print_all || !m->kflags)
__print_mce(m);
return NOTIFY_DONE;
@ -1962,6 +1962,7 @@ void mce_disable_bank(int bank)
* mce=no_cmci Disables CMCI
* mce=no_lmce Disables LMCE
* mce=dont_log_ce Clears corrected events silently, no log created for CEs.
* mce=print_all Print all machine check logs to console
* 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
@ -1990,6 +1991,8 @@ static int __init mcheck_enable(char *str)
cfg->lmce_disabled = 1;
else if (!strcmp(str, "dont_log_ce"))
cfg->dont_log_ce = true;
else if (!strcmp(str, "print_all"))
cfg->print_all = true;
else if (!strcmp(str, "ignore_ce"))
cfg->ignore_ce = true;
else if (!strcmp(str, "bootlog") || !strcmp(str, "nobootlog"))
@ -2256,6 +2259,7 @@ static ssize_t store_int_with_restart(struct device *s,
static DEVICE_INT_ATTR(tolerant, 0644, mca_cfg.tolerant);
static DEVICE_INT_ATTR(monarch_timeout, 0644, mca_cfg.monarch_timeout);
static DEVICE_BOOL_ATTR(dont_log_ce, 0644, mca_cfg.dont_log_ce);
static DEVICE_BOOL_ATTR(print_all, 0644, mca_cfg.print_all);
static struct dev_ext_attribute dev_attr_check_interval = {
__ATTR(check_interval, 0644, device_show_int, store_int_with_restart),
@ -2280,6 +2284,7 @@ static struct device_attribute *mce_device_attrs[] = {
#endif
&dev_attr_monarch_timeout.attr,
&dev_attr_dont_log_ce.attr,
&dev_attr_print_all.attr,
&dev_attr_ignore_ce.attr,
&dev_attr_cmci_disabled.attr,
NULL

1
arch/x86/kernel/cpu/mce/internal.h
View File

@ -119,6 +119,7 @@ struct mca_config {
bool dont_log_ce;
bool cmci_disabled;
bool ignore_ce;
bool print_all;
__u64 lmce_disabled : 1,
disabled : 1,