arch/x86_64/kernel/mce_intel.c

   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
  16 asmlinkage 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
  32 static 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
  86 void __cpuinit mce_intel_feature_init(struct cpuinfo_x86 *c)
  87 {
  88         intel_init_thermal(c);
  89 }