3222b36f46
The counter is exported to /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). AK: Fixed cpu hotplug locking Signed-off-by: Dmitriy Zavin <dmitriyz@google.com> Signed-off-by: Andi Kleen <ak@suse.de>
90 lines
2.0 KiB
C
90 lines
2.0 KiB
C
/*
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* Intel specific MCE features.
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* Copyright 2004 Zwane Mwaikambo <zwane@linuxpower.ca>
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*/
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#include <linux/init.h>
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#include <linux/interrupt.h>
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#include <linux/percpu.h>
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#include <asm/processor.h>
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#include <asm/msr.h>
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#include <asm/mce.h>
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#include <asm/hw_irq.h>
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#include <asm/idle.h>
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#include <asm/therm_throt.h>
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asmlinkage void smp_thermal_interrupt(void)
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{
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__u64 msr_val;
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ack_APIC_irq();
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exit_idle();
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irq_enter();
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rdmsrl(MSR_IA32_THERM_STATUS, msr_val);
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if (therm_throt_process(msr_val & 1))
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mce_log_therm_throt_event(smp_processor_id(), msr_val);
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irq_exit();
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}
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static void __cpuinit intel_init_thermal(struct cpuinfo_x86 *c)
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{
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u32 l, h;
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int tm2 = 0;
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unsigned int cpu = smp_processor_id();
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if (!cpu_has(c, X86_FEATURE_ACPI))
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return;
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if (!cpu_has(c, X86_FEATURE_ACC))
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return;
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/* first check if TM1 is already enabled by the BIOS, in which
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* case there might be some SMM goo which handles it, so we can't even
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* put a handler 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 & (1 << 3)) && (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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if (cpu_has(c, X86_FEATURE_TM2) && (l & (1 << 13)))
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tm2 = 1;
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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 "
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"installed\n", cpu, (h & APIC_VECTOR_MASK));
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return;
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}
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h = THERMAL_APIC_VECTOR;
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h |= (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, l | 0x03, h);
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rdmsr(MSR_IA32_MISC_ENABLE, l, h);
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wrmsr(MSR_IA32_MISC_ENABLE, l | (1 << 3), h);
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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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return;
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}
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void __cpuinit mce_intel_feature_init(struct cpuinfo_x86 *c)
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{
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intel_init_thermal(c);
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}
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