forked from Minki/linux
b417c9fd86
If a system switches back and forth between hot and cold mode, the MCE code will print a stream of critical kernel messages. Extend the throttling code to properly notice this, by only printing the first hot + cold transition and omitting the rest up to CHECK_INTERVAL (5 minutes). This way we'll only get a single incident of: [ 102.356584] CPU0: Temperature above threshold, cpu clock throttled (total events = 1) [ 102.357000] Disabling lock debugging due to kernel taint [ 102.369223] CPU0: Temperature/speed normal Every 5 minutes. The 'total events' count tells the number of cold/hot transitions detected, should overheating occur after 5 minutes again: [ 402.357580] CPU0: Temperature above threshold, cpu clock throttled (total events = 24891) [ 402.358001] CPU0: Temperature/speed normal [ 450.704142] Machine check events logged Cc: Hidetoshi Seto <seto.hidetoshi@jp.fujitsu.com> Cc: Huang Ying <ying.huang@intel.com> Cc: Andi Kleen <ak@linux.intel.com> LKML-Reference: <new-submission> Signed-off-by: Ingo Molnar <mingo@elte.hu>
321 lines
8.4 KiB
C
321 lines
8.4 KiB
C
/*
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* Thermal throttle event support code (such as syslog messaging and rate
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* limiting) that was factored out from x86_64 (mce_intel.c) and i386 (p4.c).
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*
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* This allows consistent reporting of CPU thermal throttle events.
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*
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* Maintains a counter in /sys that keeps track of the number of thermal
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* events, such that the user knows how bad the thermal problem might be
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* (since the logging to syslog and mcelog is rate limited).
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*
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* Author: Dmitriy Zavin (dmitriyz@google.com)
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*
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* Credits: Adapted from Zwane Mwaikambo's original code in mce_intel.c.
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* Inspired by Ross Biro's and Al Borchers' counter code.
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*/
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#include <linux/interrupt.h>
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#include <linux/notifier.h>
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#include <linux/jiffies.h>
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#include <linux/kernel.h>
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#include <linux/percpu.h>
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#include <linux/sysdev.h>
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#include <linux/types.h>
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#include <linux/init.h>
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#include <linux/smp.h>
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#include <linux/cpu.h>
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#include <asm/processor.h>
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#include <asm/system.h>
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#include <asm/apic.h>
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#include <asm/idle.h>
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#include <asm/mce.h>
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#include <asm/msr.h>
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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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/*
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* Current thermal throttling state:
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*/
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struct thermal_state {
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bool is_throttled;
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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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};
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static DEFINE_PER_CPU(struct thermal_state, thermal_state);
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static atomic_t therm_throt_en = ATOMIC_INIT(0);
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#ifdef CONFIG_SYSFS
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#define define_therm_throt_sysdev_one_ro(_name) \
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static SYSDEV_ATTR(_name, 0444, therm_throt_sysdev_show_##_name, NULL)
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#define define_therm_throt_sysdev_show_func(name) \
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\
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static ssize_t therm_throt_sysdev_show_##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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{ \
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unsigned int cpu = dev->id; \
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ssize_t ret; \
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\
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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).name); \
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else \
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ret = 0; \
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preempt_enable(); \
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\
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return ret; \
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}
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define_therm_throt_sysdev_show_func(throttle_count);
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define_therm_throt_sysdev_one_ro(throttle_count);
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static struct attribute *thermal_throttle_attrs[] = {
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&attr_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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.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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/***
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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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* thermal interrupt normally gets called both when the thermal
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* event begins and once the event has ended.
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*
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* This function is called by the thermal interrupt after the
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* IRQ has been acknowledged.
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*
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* It will take care of rate limiting and printing messages to the syslog.
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*
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* Returns: 0 : Event should NOT be further logged, i.e. still in
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* "timeout" from previous log message.
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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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static int therm_throt_process(bool is_throttled)
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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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u64 now;
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this_cpu = smp_processor_id();
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now = get_jiffies_64();
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state = &per_cpu(thermal_state, this_cpu);
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was_throttled = state->is_throttled;
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state->is_throttled = is_throttled;
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if (is_throttled)
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state->throttle_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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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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/* if we just entered the thermal event */
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if (is_throttled) {
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printk(KERN_CRIT "CPU%d: Temperature above threshold, cpu clock throttled (total events = %lu)\n", this_cpu, state->throttle_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: Temperature/speed normal\n", this_cpu);
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return 1;
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}
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return 0;
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}
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#ifdef CONFIG_SYSFS
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/* Add/Remove thermal_throttle interface for CPU device: */
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static __cpuinit int thermal_throttle_add_dev(struct sys_device *sys_dev)
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{
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return sysfs_create_group(&sys_dev->kobj,
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&thermal_throttle_attr_group);
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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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}
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/* Mutex protecting device creation against CPU hotplug: */
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static DEFINE_MUTEX(therm_cpu_lock);
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/* Get notified when a cpu comes on/off. Be hotplug friendly. */
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static __cpuinit int
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thermal_throttle_cpu_callback(struct notifier_block *nfb,
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unsigned long action,
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void *hcpu)
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{
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unsigned int cpu = (unsigned long)hcpu;
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struct sys_device *sys_dev;
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int err = 0;
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sys_dev = get_cpu_sysdev(cpu);
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switch (action) {
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case CPU_UP_PREPARE:
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case CPU_UP_PREPARE_FROZEN:
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mutex_lock(&therm_cpu_lock);
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err = thermal_throttle_add_dev(sys_dev);
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mutex_unlock(&therm_cpu_lock);
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WARN_ON(err);
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break;
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case CPU_UP_CANCELED:
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case CPU_UP_CANCELED_FROZEN:
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case CPU_DEAD:
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case CPU_DEAD_FROZEN:
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mutex_lock(&therm_cpu_lock);
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thermal_throttle_remove_dev(sys_dev);
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mutex_unlock(&therm_cpu_lock);
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break;
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}
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return err ? NOTIFY_BAD : NOTIFY_OK;
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}
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static struct notifier_block thermal_throttle_cpu_notifier __cpuinitdata =
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{
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.notifier_call = thermal_throttle_cpu_callback,
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};
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static __init int thermal_throttle_init_device(void)
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{
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unsigned int cpu = 0;
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int err;
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if (!atomic_read(&therm_throt_en))
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return 0;
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register_hotcpu_notifier(&thermal_throttle_cpu_notifier);
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#ifdef CONFIG_HOTPLUG_CPU
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mutex_lock(&therm_cpu_lock);
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#endif
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/* connect live CPUs to sysfs */
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for_each_online_cpu(cpu) {
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err = thermal_throttle_add_dev(get_cpu_sysdev(cpu));
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WARN_ON(err);
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}
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#ifdef CONFIG_HOTPLUG_CPU
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mutex_unlock(&therm_cpu_lock);
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#endif
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return 0;
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}
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device_initcall(thermal_throttle_init_device);
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#endif /* CONFIG_SYSFS */
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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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__u64 msr_val;
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rdmsrl(MSR_IA32_THERM_STATUS, msr_val);
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if (therm_throt_process((msr_val & THERM_STATUS_PROCHOT) != 0))
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mce_log_therm_throt_event(msr_val);
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}
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static void unexpected_thermal_interrupt(void)
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{
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printk(KERN_ERR "CPU%d: Unexpected LVT TMR interrupt!\n",
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smp_processor_id());
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add_taint(TAINT_MACHINE_CHECK);
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}
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static void (*smp_thermal_vector)(void) = unexpected_thermal_interrupt;
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asmlinkage void smp_thermal_interrupt(struct pt_regs *regs)
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{
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exit_idle();
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irq_enter();
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inc_irq_stat(irq_thermal_count);
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smp_thermal_vector();
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irq_exit();
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/* Ack only at the end to avoid potential reentry */
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ack_APIC_irq();
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}
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void intel_init_thermal(struct cpuinfo_x86 *c)
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{
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unsigned int cpu = smp_processor_id();
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int tm2 = 0;
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u32 l, h;
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/* Thermal monitoring depends on ACPI and clock modulation*/
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if (!cpu_has(c, X86_FEATURE_ACPI) || !cpu_has(c, X86_FEATURE_ACC))
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return;
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/*
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* First check if its enabled already, in which case there might
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* be some SMM goo which handles it, so we can't even put a handler
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* since it might be delivered via SMI already:
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*/
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rdmsr(MSR_IA32_MISC_ENABLE, l, h);
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h = apic_read(APIC_LVTTHMR);
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if ((l & MSR_IA32_MISC_ENABLE_TM1) && (h & APIC_DM_SMI)) {
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printk(KERN_DEBUG
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"CPU%d: Thermal monitoring handled by SMI\n", cpu);
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return;
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}
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/* Check whether a vector already exists */
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if (h & APIC_VECTOR_MASK) {
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printk(KERN_DEBUG
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"CPU%d: Thermal LVT vector (%#x) already installed\n",
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cpu, (h & APIC_VECTOR_MASK));
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return;
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}
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/* early Pentium M models use different method for enabling TM2 */
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if (cpu_has(c, X86_FEATURE_TM2)) {
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if (c->x86 == 6 && (c->x86_model == 9 || c->x86_model == 13)) {
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rdmsr(MSR_THERM2_CTL, l, h);
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if (l & MSR_THERM2_CTL_TM_SELECT)
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tm2 = 1;
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} else if (l & MSR_IA32_MISC_ENABLE_TM2)
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tm2 = 1;
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}
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/* We'll mask the thermal vector in the lapic till we're ready: */
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h = THERMAL_APIC_VECTOR | APIC_DM_FIXED | APIC_LVT_MASKED;
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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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smp_thermal_vector = intel_thermal_interrupt;
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rdmsr(MSR_IA32_MISC_ENABLE, l, h);
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wrmsr(MSR_IA32_MISC_ENABLE, l | MSR_IA32_MISC_ENABLE_TM1, h);
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/* Unmask the thermal vector: */
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l = apic_read(APIC_LVTTHMR);
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apic_write(APIC_LVTTHMR, l & ~APIC_LVT_MASKED);
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printk(KERN_INFO "CPU%d: Thermal monitoring enabled (%s)\n",
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cpu, tm2 ? "TM2" : "TM1");
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/* enable thermal throttle processing */
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atomic_set(&therm_throt_en, 1);
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}
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