mirror of https://gitee.com/openkylin/linux.git
75 lines
1.9 KiB
C
75 lines
1.9 KiB
C
/*
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* Common code for Intel machine checks
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*/
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#include <linux/interrupt.h>
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#include <linux/kernel.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 <asm/therm_throt.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/msr.h>
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#include "mce.h"
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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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if (cpu_has(c, X86_FEATURE_TM2) && (l & MSR_IA32_MISC_ENABLE_TM2))
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tm2 = 1;
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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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/* 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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intel_set_thermal_handler();
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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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