59 lines
1.6 KiB
C
59 lines
1.6 KiB
C
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/*
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* linux/arch/i386/kerne/cpu/mcheck/therm_throt.c
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*
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* Thermal throttle event support code.
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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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*
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*/
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#include <linux/percpu.h>
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#include <linux/cpu.h>
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#include <asm/cpu.h>
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#include <linux/notifier.h>
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#include <asm/therm_throt.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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static DEFINE_PER_CPU(unsigned long, next_check);
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/***
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* therm_throt_process - Process thermal throttling event
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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 normally 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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int therm_throt_process(int curr)
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{
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unsigned int cpu = smp_processor_id();
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if (time_before(jiffies, __get_cpu_var(next_check)))
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return 0;
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__get_cpu_var(next_check) = jiffies + CHECK_INTERVAL;
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/* if we just entered the thermal event */
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if (curr) {
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printk(KERN_CRIT "CPU%d: Temperature above threshold, "
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"cpu clock throttled\n", cpu);
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add_taint(TAINT_MACHINE_CHECK);
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} else {
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printk(KERN_CRIT "CPU%d: Temperature/speed normal\n", cpu);
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}
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return 1;
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}
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