1/*
2 * Intel specific MCE features.
3 * Copyright 2004 Zwane Mwaikambo <zwane@linuxpower.ca>
4 */
5
6#include <linux/init.h>
7#include <linux/interrupt.h>
8#include <linux/percpu.h>
9#include <asm/processor.h>
10#include <asm/msr.h>
11#include <asm/mce.h>
12#include <asm/hw_irq.h>
13#include <asm/idle.h>
14#include <asm/therm_throt.h>
15
16asmlinkage void smp_thermal_interrupt(void)
17{
18	__u64 msr_val;
19
20	ack_APIC_irq();
21
22	exit_idle();
23	irq_enter();
24
25	rdmsrl(MSR_IA32_THERM_STATUS, msr_val);
26	if (therm_throt_process(msr_val & 1))
27		mce_log_therm_throt_event(smp_processor_id(), msr_val);
28
29	irq_exit();
30}
31
32static void __cpuinit intel_init_thermal(struct cpuinfo_x86 *c)
33{
34	u32 l, h;
35	int tm2 = 0;
36	unsigned int cpu = smp_processor_id();
37
38	if (!cpu_has(c, X86_FEATURE_ACPI))
39		return;
40
41	if (!cpu_has(c, X86_FEATURE_ACC))
42		return;
43
44	/* first check if TM1 is already enabled by the BIOS, in which
45	 * case there might be some SMM goo which handles it, so we can't even
46	 * put a handler since it might be delivered via SMI already.
47	 */
48	rdmsr(MSR_IA32_MISC_ENABLE, l, h);
49	h = apic_read(APIC_LVTTHMR);
50	if ((l & (1 << 3)) && (h & APIC_DM_SMI)) {
51		printk(KERN_DEBUG
52		       "CPU%d: Thermal monitoring handled by SMI\n", cpu);
53		return;
54	}
55
56	if (cpu_has(c, X86_FEATURE_TM2) && (l & (1 << 13)))
57		tm2 = 1;
58
59	if (h & APIC_VECTOR_MASK) {
60		printk(KERN_DEBUG
61		       "CPU%d: Thermal LVT vector (%#x) already "
62		       "installed\n", cpu, (h & APIC_VECTOR_MASK));
63		return;
64	}
65
66	h = THERMAL_APIC_VECTOR;
67	h |= (APIC_DM_FIXED | APIC_LVT_MASKED);
68	apic_write(APIC_LVTTHMR, h);
69
70	rdmsr(MSR_IA32_THERM_INTERRUPT, l, h);
71	wrmsr(MSR_IA32_THERM_INTERRUPT, l | 0x03, h);
72
73	rdmsr(MSR_IA32_MISC_ENABLE, l, h);
74	wrmsr(MSR_IA32_MISC_ENABLE, l | (1 << 3), h);
75
76	l = apic_read(APIC_LVTTHMR);
77	apic_write(APIC_LVTTHMR, l & ~APIC_LVT_MASKED);
78	printk(KERN_INFO "CPU%d: Thermal monitoring enabled (%s)\n",
79		cpu, tm2 ? "TM2" : "TM1");
80
81	/* enable thermal throttle processing */
82	atomic_set(&therm_throt_en, 1);
83	return;
84}
85
86void __cpuinit mce_intel_feature_init(struct cpuinfo_x86 *c)
87{
88	intel_init_thermal(c);
89}
90