x86, mce: sysfs entries for new mce options

Add sysfs interface for admins who want to tweak these options without
rebooting the system.

Signed-off-by: Hidetoshi Seto <seto.hidetoshi@jp.fujitsu.com>
Signed-off-by: H. Peter Anvin <hpa@zytor.com>

1 files changed, 83 insertions, 1 deletions

diff --git a/arch/x86/kernel/cpu/mcheck/mce.c b/arch/x86/kernel/cpu/mcheck/mce.c
index e8b893e880ed..4b62443b6e72 100644
--- a/arch/x86/kernel/cpu/mcheck/mce.c
+++ b/arch/x86/kernel/cpu/mcheck/mce.c
@@ -1626,6 +1626,26 @@ static void mce_restart(void)
         on_each_cpu(mce_cpu_restart, NULL, 1);
 }
 
+/* Toggle features for corrected errors */
+static void mce_disable_ce(void *all)
+{
+        if (!mce_available(&current_cpu_data))
+                return;
+        if (all)
+                del_timer_sync(&__get_cpu_var(mce_timer));
+        cmci_clear();
+}
+
+static void mce_enable_ce(void *all)
+{
+        if (!mce_available(&current_cpu_data))
+                return;
+        cmci_reenable();
+        cmci_recheck();
+        if (all)
+                mce_init_timer();
+}
+
 static struct sysdev_class mce_sysclass = {
         .suspend        = mce_suspend,
         .shutdown       = mce_shutdown,
@@ -1687,6 +1707,52 @@ static ssize_t set_trigger(struct sys_device *s, struct sysdev_attribute *attr,
         return len;
 }
 
+static ssize_t set_ignore_ce(struct sys_device *s,
+                             struct sysdev_attribute *attr,
+                             const char *buf, size_t size)
+{
+        u64 new;
+
+        if (strict_strtoull(buf, 0, &new) < 0)
+                return -EINVAL;
+
+        if (mce_ignore_ce ^ !!new) {
+                if (new) {
+                        /* disable ce features */
+                        on_each_cpu(mce_disable_ce, (void *)1, 1);
+                        mce_ignore_ce = 1;
+                } else {
+                        /* enable ce features */
+                        mce_ignore_ce = 0;
+                        on_each_cpu(mce_enable_ce, (void *)1, 1);
+                }
+        }
+        return size;
+}
+
+static ssize_t set_cmci_disabled(struct sys_device *s,
+                                 struct sysdev_attribute *attr,
+                                 const char *buf, size_t size)
+{
+        u64 new;
+
+        if (strict_strtoull(buf, 0, &new) < 0)
+                return -EINVAL;
+
+        if (mce_cmci_disabled ^ !!new) {
+                if (new) {
+                        /* disable cmci */
+                        on_each_cpu(mce_disable_ce, NULL, 1);
+                        mce_cmci_disabled = 1;
+                } else {
+                        /* enable cmci */
+                        mce_cmci_disabled = 0;
+                        on_each_cpu(mce_enable_ce, NULL, 1);
+                }
+        }
+        return size;
+}
+
 static ssize_t store_int_with_restart(struct sys_device *s,
                                       struct sysdev_attribute *attr,
                                       const char *buf, size_t size)
@@ -1699,6 +1765,7 @@ static ssize_t store_int_with_restart(struct sys_device *s,
 static SYSDEV_ATTR(trigger, 0644, show_trigger, set_trigger);
 static SYSDEV_INT_ATTR(tolerant, 0644, tolerant);
 static SYSDEV_INT_ATTR(monarch_timeout, 0644, monarch_timeout);
+static SYSDEV_INT_ATTR(dont_log_ce, 0644, mce_dont_log_ce);
 
 static struct sysdev_ext_attribute attr_check_interval = {
         _SYSDEV_ATTR(check_interval, 0644, sysdev_show_int,
@@ -1706,9 +1773,24 @@ static struct sysdev_ext_attribute attr_check_interval = {
         &check_interval
 };
 
+static struct sysdev_ext_attribute attr_ignore_ce = {
+        _SYSDEV_ATTR(ignore_ce, 0644, sysdev_show_int, set_ignore_ce),
+        &mce_ignore_ce
+};
+
+static struct sysdev_ext_attribute attr_cmci_disabled = {
+        _SYSDEV_ATTR(ignore_ce, 0644, sysdev_show_int, set_cmci_disabled),
+        &mce_cmci_disabled
+};
+
 static struct sysdev_attribute *mce_attrs[] = {
-        &attr_tolerant.attr, &attr_check_interval.attr, &attr_trigger,
+        &attr_tolerant.attr,
+        &attr_check_interval.attr,
+        &attr_trigger,
         &attr_monarch_timeout.attr,
+        &attr_dont_log_ce.attr,
+        &attr_ignore_ce.attr,
+        &attr_cmci_disabled.attr,
         NULL
 };