x86, hwmon: Package Level Thermal/Power: power limit
Power limit notification feature is published in Intel 64 and IA-32 Architectures SDMV Vol 3A 14.5.6 Power Limit Notification. It is implemented first on Intel Sandy Bridge platform. The patch handles notification interrupt. Interrupt handler dumps power limit information in log_buf, logs the event in mce log, and increases the event counters (core_power_limit and package_power_limit). Upper level applications could use the data to detect system health or diagnose functionality/performance issues. In the future, the event could be handled in a more fancy way. Signed-off-by: Fenghua Yu <fenghua.yu@intel.com> LKML-Reference: <1280448826-12004-5-git-send-email-fenghua.yu@intel.com> Reviewed-by: Len Brown <len.brown@intel.com> Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
This commit is contained in:
Fenghua Yu
H. Peter Anvin
Родитель
55d435a227
Коммит
0199114c31
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@ -34,20 +34,25 @@
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/* How long to wait between reporting thermal events */
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#define CHECK_INTERVAL (300 * HZ)
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#define THERMAL_THROTTLING_EVENT 0
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#define POWER_LIMIT_EVENT 1
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/*
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* Current thermal throttling state:
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* Current thermal event state:
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*/
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struct _thermal_state {
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bool is_throttled;
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bool new_event;
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int event;
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u64 next_check;
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unsigned long throttle_count;
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unsigned long last_throttle_count;
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unsigned long count;
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unsigned long last_count;
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};
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struct thermal_state {
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struct _thermal_state core;
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struct _thermal_state package;
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struct _thermal_state core_throttle;
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struct _thermal_state core_power_limit;
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struct _thermal_state package_throttle;
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struct _thermal_state package_power_limit;
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};
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static DEFINE_PER_CPU(struct thermal_state, thermal_state);
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@ -62,9 +67,9 @@ static u32 lvtthmr_init __read_mostly;
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therm_throt_sysdev_show_##_name, \
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NULL) \
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#define define_therm_throt_sysdev_show_func(level, name) \
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#define define_therm_throt_sysdev_show_func(event, name) \
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\
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static ssize_t therm_throt_sysdev_show_##level##_##name( \
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static ssize_t therm_throt_sysdev_show_##event##_##name( \
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struct sys_device *dev, \
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struct sysdev_attribute *attr, \
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char *buf) \
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@ -75,7 +80,7 @@ static ssize_t therm_throt_sysdev_show_##level##_##name( \
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preempt_disable(); /* CPU hotplug */ \
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if (cpu_online(cpu)) { \
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ret = sprintf(buf, "%lu\n", \
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per_cpu(thermal_state, cpu).level.name); \
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per_cpu(thermal_state, cpu).event.name); \
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} else \
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ret = 0; \
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preempt_enable(); \
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@ -83,23 +88,32 @@ static ssize_t therm_throt_sysdev_show_##level##_##name( \
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return ret; \
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}
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define_therm_throt_sysdev_show_func(core, throttle_count);
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define_therm_throt_sysdev_show_func(core_throttle, count);
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define_therm_throt_sysdev_one_ro(core_throttle_count);
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define_therm_throt_sysdev_show_func(package, throttle_count);
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define_therm_throt_sysdev_show_func(core_power_limit, count);
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define_therm_throt_sysdev_one_ro(core_power_limit_count);
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define_therm_throt_sysdev_show_func(package_throttle, count);
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define_therm_throt_sysdev_one_ro(package_throttle_count);
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define_therm_throt_sysdev_show_func(package_power_limit, count);
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define_therm_throt_sysdev_one_ro(package_power_limit_count);
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static struct attribute *thermal_throttle_attrs[] = {
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&attr_core_throttle_count.attr,
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NULL
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};
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static struct attribute_group thermal_throttle_attr_group = {
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static struct attribute_group thermal_attr_group = {
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.attrs = thermal_throttle_attrs,
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.name = "thermal_throttle"
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};
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#endif /* CONFIG_SYSFS */
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#define CORE_LEVEL 0
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#define PACKAGE_LEVEL 1
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/***
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* therm_throt_process - Process thermal throttling event from interrupt
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* @curr: Whether the condition is current or not (boolean), since the
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@ -116,49 +130,70 @@ static struct attribute_group thermal_throttle_attr_group = {
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* 1 : Event should be logged further, and a message has been
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* printed to the syslog.
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*/
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#define CORE_LEVEL 0
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#define PACKAGE_LEVEL 1
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static int therm_throt_process(bool is_throttled, int level)
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static int therm_throt_process(bool new_event, int event, int level)
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{
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struct _thermal_state *state;
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unsigned int this_cpu;
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bool was_throttled;
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unsigned int this_cpu = smp_processor_id();
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bool old_event;
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u64 now;
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struct thermal_state *pstate = &per_cpu(thermal_state, this_cpu);
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this_cpu = smp_processor_id();
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now = get_jiffies_64();
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if (level == CORE_LEVEL)
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state = &per_cpu(thermal_state, this_cpu).core;
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else
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state = &per_cpu(thermal_state, this_cpu).package;
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if (level == CORE_LEVEL) {
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if (event == THERMAL_THROTTLING_EVENT)
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state = &pstate->core_throttle;
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else if (event == POWER_LIMIT_EVENT)
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state = &pstate->core_power_limit;
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else
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return 0;
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} else if (level == PACKAGE_LEVEL) {
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if (event == THERMAL_THROTTLING_EVENT)
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state = &pstate->package_throttle;
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else if (event == POWER_LIMIT_EVENT)
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state = &pstate->package_power_limit;
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else
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return 0;
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} else
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return 0;
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was_throttled = state->is_throttled;
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state->is_throttled = is_throttled;
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old_event = state->new_event;
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state->new_event = new_event;
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if (is_throttled)
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state->throttle_count++;
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if (new_event)
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state->count++;
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if (time_before64(now, state->next_check) &&
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state->throttle_count != state->last_throttle_count)
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state->count != state->last_count)
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return 0;
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state->next_check = now + CHECK_INTERVAL;
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state->last_throttle_count = state->throttle_count;
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state->last_count = state->count;
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/* if we just entered the thermal event */
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if (is_throttled) {
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printk(KERN_CRIT "CPU%d: %s temperature above threshold, cpu clock throttled (total events = %lu)\n",
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this_cpu,
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level == CORE_LEVEL ? "Core" : "Package",
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state->throttle_count);
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if (new_event) {
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if (event == THERMAL_THROTTLING_EVENT)
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printk(KERN_CRIT "CPU%d: %s temperature above threshold, cpu clock throttled (total events = %lu)\n",
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this_cpu,
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level == CORE_LEVEL ? "Core" : "Package",
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state->count);
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else
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printk(KERN_CRIT "CPU%d: %s power limit notification (total events = %lu)\n",
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this_cpu,
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level == CORE_LEVEL ? "Core" : "Package",
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state->count);
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add_taint(TAINT_MACHINE_CHECK);
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return 1;
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}
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if (was_throttled) {
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printk(KERN_INFO "CPU%d: %s temperature/speed normal\n",
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this_cpu,
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level == CORE_LEVEL ? "Core" : "Package");
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if (old_event) {
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if (event == THERMAL_THROTTLING_EVENT)
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printk(KERN_INFO "CPU%d: %s temperature/speed normal\n",
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this_cpu,
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level == CORE_LEVEL ? "Core" : "Package");
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else
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printk(KERN_INFO "CPU%d: %s power limit normal\n",
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this_cpu,
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level == CORE_LEVEL ? "Core" : "Package");
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return 1;
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}
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@ -172,21 +207,29 @@ static __cpuinit int thermal_throttle_add_dev(struct sys_device *sys_dev)
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int err;
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struct cpuinfo_x86 *c = &cpu_data(smp_processor_id());
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err = sysfs_create_group(&sys_dev->kobj, &thermal_throttle_attr_group);
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err = sysfs_create_group(&sys_dev->kobj, &thermal_attr_group);
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if (err)
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return err;
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if (cpu_has(c, X86_FEATURE_PLN))
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err = sysfs_add_file_to_group(&sys_dev->kobj,
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&attr_core_power_limit_count.attr,
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thermal_attr_group.name);
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if (cpu_has(c, X86_FEATURE_PTS))
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err = sysfs_add_file_to_group(&sys_dev->kobj,
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&attr_package_throttle_count.attr,
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thermal_throttle_attr_group.name);
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thermal_attr_group.name);
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if (cpu_has(c, X86_FEATURE_PLN))
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err = sysfs_add_file_to_group(&sys_dev->kobj,
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&attr_package_power_limit_count.attr,
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thermal_attr_group.name);
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return err;
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}
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static __cpuinit void thermal_throttle_remove_dev(struct sys_device *sys_dev)
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{
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sysfs_remove_group(&sys_dev->kobj, &thermal_throttle_attr_group);
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sysfs_remove_group(&sys_dev->kobj, &thermal_attr_group);
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}
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/* Mutex protecting device creation against CPU hotplug: */
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@ -257,6 +300,17 @@ device_initcall(thermal_throttle_init_device);
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#endif /* CONFIG_SYSFS */
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/*
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* Set up the most two significant bit to notify mce log that this thermal
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* event type.
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* This is a temp solution. May be changed in the future with mce log
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* infrasture.
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*/
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#define CORE_THROTTLED (0)
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#define CORE_POWER_LIMIT ((__u64)1 << 62)
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#define PACKAGE_THROTTLED ((__u64)2 << 62)
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#define PACKAGE_POWER_LIMIT ((__u64)3 << 62)
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/* Thermal transition interrupt handler */
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static void intel_thermal_interrupt(void)
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{
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@ -264,21 +318,31 @@ static void intel_thermal_interrupt(void)
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struct cpuinfo_x86 *c = &cpu_data(smp_processor_id());
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rdmsrl(MSR_IA32_THERM_STATUS, msr_val);
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if (therm_throt_process(msr_val & THERM_STATUS_PROCHOT,
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THERMAL_THROTTLING_EVENT,
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CORE_LEVEL) != 0)
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mce_log_therm_throt_event(msr_val);
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mce_log_therm_throt_event(CORE_THROTTLED | msr_val);
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if (cpu_has(c, X86_FEATURE_PLN))
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if (therm_throt_process(msr_val & THERM_STATUS_POWER_LIMIT,
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POWER_LIMIT_EVENT,
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CORE_LEVEL) != 0)
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mce_log_therm_throt_event(CORE_POWER_LIMIT | msr_val);
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if (cpu_has(c, X86_FEATURE_PTS)) {
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rdmsrl(MSR_IA32_PACKAGE_THERM_STATUS, msr_val);
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if (therm_throt_process(msr_val & PACKAGE_THERM_STATUS_PROCHOT,
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THERMAL_THROTTLING_EVENT,
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PACKAGE_LEVEL) != 0)
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/*
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* Set up the most significant bit to notify mce log
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* that this thermal event is a package level event.
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* This is a temp solution. May be changed in the future
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* with mce log infrasture.
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*/
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mce_log_therm_throt_event(((__u64)1 << 63) | msr_val);
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mce_log_therm_throt_event(PACKAGE_THROTTLED | msr_val);
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if (cpu_has(c, X86_FEATURE_PLN))
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if (therm_throt_process(msr_val &
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PACKAGE_THERM_STATUS_POWER_LIMIT,
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POWER_LIMIT_EVENT,
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PACKAGE_LEVEL) != 0)
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mce_log_therm_throt_event(PACKAGE_POWER_LIMIT
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| msr_val);
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}
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}
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@ -381,14 +445,25 @@ void intel_init_thermal(struct cpuinfo_x86 *c)
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apic_write(APIC_LVTTHMR, h);
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rdmsr(MSR_IA32_THERM_INTERRUPT, l, h);
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wrmsr(MSR_IA32_THERM_INTERRUPT,
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l | (THERM_INT_LOW_ENABLE | THERM_INT_HIGH_ENABLE), h);
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if (cpu_has(c, X86_FEATURE_PLN))
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wrmsr(MSR_IA32_THERM_INTERRUPT,
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l | (THERM_INT_LOW_ENABLE
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| THERM_INT_HIGH_ENABLE | THERM_INT_PLN_ENABLE), h);
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else
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wrmsr(MSR_IA32_THERM_INTERRUPT,
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l | (THERM_INT_LOW_ENABLE | THERM_INT_HIGH_ENABLE), h);
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if (cpu_has(c, X86_FEATURE_PTS)) {
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rdmsr(MSR_IA32_PACKAGE_THERM_INTERRUPT, l, h);
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wrmsr(MSR_IA32_PACKAGE_THERM_INTERRUPT,
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l | (PACKAGE_THERM_INT_LOW_ENABLE
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| PACKAGE_THERM_INT_HIGH_ENABLE), h);
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if (cpu_has(c, X86_FEATURE_PLN))
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wrmsr(MSR_IA32_PACKAGE_THERM_INTERRUPT,
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l | (PACKAGE_THERM_INT_LOW_ENABLE
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| PACKAGE_THERM_INT_HIGH_ENABLE
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| PACKAGE_THERM_INT_PLN_ENABLE), h);
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else
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wrmsr(MSR_IA32_PACKAGE_THERM_INTERRUPT,
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l | (PACKAGE_THERM_INT_LOW_ENABLE
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| PACKAGE_THERM_INT_HIGH_ENABLE), h);
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}
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smp_thermal_vector = intel_thermal_interrupt;
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