+++ /dev/null
-/*
- * linux/arch/i386/kernel/cpu/mcheck/therm_throt.c
- *
- * Thermal throttle event support code (such as syslog messaging and rate
- * limiting) that was factored out from x86_64 (mce_intel.c) and i386 (p4.c).
- * This allows consistent reporting of CPU thermal throttle events.
- *
- * Maintains a counter in /sys that keeps track of the number of thermal
- * events, such that the user knows how bad the thermal problem might be
- * (since the logging to syslog and mcelog is rate limited).
- *
- * Author: Dmitriy Zavin (dmitriyz@google.com)
- *
- * Credits: Adapted from Zwane Mwaikambo's original code in mce_intel.c.
- * Inspired by Ross Biro's and Al Borchers' counter code.
- */
-
-#include <linux/percpu.h>
-#include <linux/sysdev.h>
-#include <linux/cpu.h>
-#include <asm/cpu.h>
-#include <linux/notifier.h>
-#include <linux/jiffies.h>
-#include <asm/therm_throt.h>
-
-/* How long to wait between reporting thermal events */
-#define CHECK_INTERVAL (300 * HZ)
-
-static DEFINE_PER_CPU(__u64, next_check) = INITIAL_JIFFIES;
-static DEFINE_PER_CPU(unsigned long, thermal_throttle_count);
-atomic_t therm_throt_en = ATOMIC_INIT(0);
-
-#ifdef CONFIG_SYSFS
-#define define_therm_throt_sysdev_one_ro(_name) \
- static SYSDEV_ATTR(_name, 0444, therm_throt_sysdev_show_##_name, NULL)
-
-#define define_therm_throt_sysdev_show_func(name) \
-static ssize_t therm_throt_sysdev_show_##name(struct sys_device *dev, \
- char *buf) \
-{ \
- unsigned int cpu = dev->id; \
- ssize_t ret; \
- \
- preempt_disable(); /* CPU hotplug */ \
- if (cpu_online(cpu)) \
- ret = sprintf(buf, "%lu\n", \
- per_cpu(thermal_throttle_##name, cpu)); \
- else \
- ret = 0; \
- preempt_enable(); \
- \
- return ret; \
-}
-
-define_therm_throt_sysdev_show_func(count);
-define_therm_throt_sysdev_one_ro(count);
-
-static struct attribute *thermal_throttle_attrs[] = {
- &attr_count.attr,
- NULL
-};
-
-static struct attribute_group thermal_throttle_attr_group = {
- .attrs = thermal_throttle_attrs,
- .name = "thermal_throttle"
-};
-#endif /* CONFIG_SYSFS */
-
-/***
- * therm_throt_process - Process thermal throttling event from interrupt
- * @curr: Whether the condition is current or not (boolean), since the
- * thermal interrupt normally gets called both when the thermal
- * event begins and once the event has ended.
- *
- * This function is called by the thermal interrupt after the
- * IRQ has been acknowledged.
- *
- * It will take care of rate limiting and printing messages to the syslog.
- *
- * Returns: 0 : Event should NOT be further logged, i.e. still in
- * "timeout" from previous log message.
- * 1 : Event should be logged further, and a message has been
- * printed to the syslog.
- */
-int therm_throt_process(int curr)
-{
- unsigned int cpu = smp_processor_id();
- __u64 tmp_jiffs = get_jiffies_64();
-
- if (curr)
- __get_cpu_var(thermal_throttle_count)++;
-
- if (time_before64(tmp_jiffs, __get_cpu_var(next_check)))
- return 0;
-
- __get_cpu_var(next_check) = tmp_jiffs + CHECK_INTERVAL;
-
- /* if we just entered the thermal event */
- if (curr) {
- printk(KERN_CRIT "CPU%d: Temperature above threshold, "
- "cpu clock throttled (total events = %lu)\n", cpu,
- __get_cpu_var(thermal_throttle_count));
-
- add_taint(TAINT_MACHINE_CHECK);
- } else {
- printk(KERN_CRIT "CPU%d: Temperature/speed normal\n", cpu);
- }
-
- return 1;
-}
-
-#ifdef CONFIG_SYSFS
-/* Add/Remove thermal_throttle interface for CPU device */
-static __cpuinit int thermal_throttle_add_dev(struct sys_device *sys_dev)
-{
- return sysfs_create_group(&sys_dev->kobj, &thermal_throttle_attr_group);
-}
-
-static __cpuinit void thermal_throttle_remove_dev(struct sys_device *sys_dev)
-{
- return sysfs_remove_group(&sys_dev->kobj, &thermal_throttle_attr_group);
-}
-
-/* Mutex protecting device creation against CPU hotplug */
-static DEFINE_MUTEX(therm_cpu_lock);
-
-/* Get notified when a cpu comes on/off. Be hotplug friendly. */
-static __cpuinit int thermal_throttle_cpu_callback(struct notifier_block *nfb,
- unsigned long action,
- void *hcpu)
-{
- unsigned int cpu = (unsigned long)hcpu;
- struct sys_device *sys_dev;
- int err;
-
- sys_dev = get_cpu_sysdev(cpu);
- switch (action) {
- case CPU_ONLINE:
- case CPU_ONLINE_FROZEN:
- mutex_lock(&therm_cpu_lock);
- err = thermal_throttle_add_dev(sys_dev);
- mutex_unlock(&therm_cpu_lock);
- WARN_ON(err);
- break;
- case CPU_DEAD:
- case CPU_DEAD_FROZEN:
- mutex_lock(&therm_cpu_lock);
- thermal_throttle_remove_dev(sys_dev);
- mutex_unlock(&therm_cpu_lock);
- break;
- }
- return NOTIFY_OK;
-}
-
-static struct notifier_block thermal_throttle_cpu_notifier =
-{
- .notifier_call = thermal_throttle_cpu_callback,
-};
-
-static __init int thermal_throttle_init_device(void)
-{
- unsigned int cpu = 0;
- int err;
-
- if (!atomic_read(&therm_throt_en))
- return 0;
-
- register_hotcpu_notifier(&thermal_throttle_cpu_notifier);
-
-#ifdef CONFIG_HOTPLUG_CPU
- mutex_lock(&therm_cpu_lock);
-#endif
- /* connect live CPUs to sysfs */
- for_each_online_cpu(cpu) {
- err = thermal_throttle_add_dev(get_cpu_sysdev(cpu));
- WARN_ON(err);
- }
-#ifdef CONFIG_HOTPLUG_CPU
- mutex_unlock(&therm_cpu_lock);
-#endif
-
- return 0;
-}
-
-device_initcall(thermal_throttle_init_device);
-#endif /* CONFIG_SYSFS */
git://ftp.safe.ca / safe / jmp / linux-2.6 / blobdiff