100 lines
2.3 KiB
C
100 lines
2.3 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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static DEFINE_PER_CPU(unsigned long, next_check);
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asmlinkage void smp_thermal_interrupt(void)
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{
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struct mce m;
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ack_APIC_irq();
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irq_enter();
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if (time_before(jiffies, __get_cpu_var(next_check)))
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goto done;
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__get_cpu_var(next_check) = jiffies + HZ*300;
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memset(&m, 0, sizeof(m));
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m.cpu = smp_processor_id();
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m.bank = MCE_THERMAL_BANK;
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rdtscll(m.tsc);
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rdmsrl(MSR_IA32_THERM_STATUS, m.status);
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if (m.status & 0x1) {
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printk(KERN_EMERG
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"CPU%d: Temperature above threshold, cpu clock throttled\n", m.cpu);
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add_taint(TAINT_MACHINE_CHECK);
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} else {
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printk(KERN_EMERG "CPU%d: Temperature/speed normal\n", m.cpu);
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}
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mce_log(&m);
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done:
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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_around(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_around(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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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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