1 files changed, 99 insertions, 0 deletions
diff --git a/arch/x86_64/kernel/mce_intel.c b/arch/x86_64/kernel/mce_intel.c
new file mode 100644
index 00000000000..4db9a640069
--- /dev/null
+++ b/arch/x86_64/kernel/mce_intel.c
@@ -0,0 +1,99 @@
+/*
+ * Intel specific MCE features.
+ * Copyright 2004 Zwane Mwaikambo <zwane@linuxpower.ca>
+ */
+
+#include <linux/init.h>
+#include <linux/interrupt.h>
+#include <linux/percpu.h>
+#include <asm/processor.h>
+#include <asm/msr.h>
+#include <asm/mce.h>
+#include <asm/hw_irq.h>
+
+static DEFINE_PER_CPU(unsigned long, next_check);
+
+asmlinkage void smp_thermal_interrupt(void)
+{
+	struct mce m;
+
+	ack_APIC_irq();
+
+	irq_enter();
+	if (time_before(jiffies, __get_cpu_var(next_check)))
+		goto done;
+
+	__get_cpu_var(next_check) = jiffies + HZ*300;
+	memset(&m, 0, sizeof(m));
+	m.cpu = smp_processor_id();
+	m.bank = MCE_THERMAL_BANK;
+	rdtscll(m.tsc);
+	rdmsrl(MSR_IA32_THERM_STATUS, m.status);
+	if (m.status & 0x1) {
+		printk(KERN_EMERG
+			"CPU%d: Temperature above threshold, cpu clock throttled\n", m.cpu);
+		add_taint(TAINT_MACHINE_CHECK);
+	} else {
+		printk(KERN_EMERG "CPU%d: Temperature/speed normal\n", m.cpu);
+	}
+
+	mce_log(&m);
+done:
+	irq_exit();
+}
+
+static void __init intel_init_thermal(struct cpuinfo_x86 *c)
+{
+	u32 l, h;
+	int tm2 = 0;
+	unsigned int cpu = smp_processor_id();
+
+	if (!cpu_has(c, X86_FEATURE_ACPI))
+		return;
+
+	if (!cpu_has(c, X86_FEATURE_ACC))
+		return;
+
+	/* first check if TM1 is already enabled by the BIOS, in which
+	 * case there might be some SMM goo which handles it, so we can't even
+	 * put a handler since it might be delivered via SMI already.
+	 */
+	rdmsr(MSR_IA32_MISC_ENABLE, l, h);
+	h = apic_read(APIC_LVTTHMR);
+	if ((l & (1 << 3)) && (h & APIC_DM_SMI)) {
+		printk(KERN_DEBUG
+		       "CPU%d: Thermal monitoring handled by SMI\n", cpu);
+		return;
+	}
+
+	if (cpu_has(c, X86_FEATURE_TM2) && (l & (1 << 13)))
+		tm2 = 1;
+
+	if (h & APIC_VECTOR_MASK) {
+		printk(KERN_DEBUG
+		       "CPU%d: Thermal LVT vector (%#x) already "
+		       "installed\n", cpu, (h & APIC_VECTOR_MASK));
+		return;
+	}
+
+	h = THERMAL_APIC_VECTOR;
+	h |= (APIC_DM_FIXED | APIC_LVT_MASKED);
+	apic_write_around(APIC_LVTTHMR, h);
+
+	rdmsr(MSR_IA32_THERM_INTERRUPT, l, h);
+	wrmsr(MSR_IA32_THERM_INTERRUPT, l | 0x03, h);
+
+	rdmsr(MSR_IA32_MISC_ENABLE, l, h);
+	wrmsr(MSR_IA32_MISC_ENABLE, l | (1 << 3), h);
+
+	l = apic_read(APIC_LVTTHMR);
+	apic_write_around(APIC_LVTTHMR, l & ~APIC_LVT_MASKED);
+	printk(KERN_INFO "CPU%d: Thermal monitoring enabled (%s)\n",
+		cpu, tm2 ? "TM2" : "TM1");
+	return;
+}
+
+void __init mce_intel_feature_init(struct cpuinfo_x86 *c)
+{
+	intel_init_thermal(c);
+}