u64 next_check;
unsigned long throttle_count;
+ unsigned long last_throttle_count;
};
static DEFINE_PER_CPU(struct thermal_state, thermal_state);
static atomic_t therm_throt_en = ATOMIC_INIT(0);
+static u32 lvtthmr_init __read_mostly;
+
#ifdef CONFIG_SYSFS
#define define_therm_throt_sysdev_one_ro(_name) \
static SYSDEV_ATTR(_name, 0444, therm_throt_sysdev_show_##_name, NULL)
if (is_throttled)
state->throttle_count++;
- if (!(was_throttled ^ is_throttled) &&
- time_before64(now, state->next_check))
+ if (time_before64(now, state->next_check) &&
+ state->throttle_count != state->last_throttle_count)
return 0;
state->next_check = now + CHECK_INTERVAL;
+ state->last_throttle_count = state->throttle_count;
/* if we just entered the thermal event */
if (is_throttled) {
ack_APIC_irq();
}
+void __init mcheck_intel_therm_init(void)
+{
+ /*
+ * This function is only called on boot CPU. Save the init thermal
+ * LVT value on BSP and use that value to restore APs' thermal LVT
+ * entry BIOS programmed later
+ */
+ if (cpu_has(&boot_cpu_data, X86_FEATURE_ACPI) &&
+ cpu_has(&boot_cpu_data, X86_FEATURE_ACC))
+ lvtthmr_init = apic_read(APIC_LVTTHMR);
+}
+
void intel_init_thermal(struct cpuinfo_x86 *c)
{
unsigned int cpu = smp_processor_id();
int tm2 = 0;
u32 l, h;
- /* Thermal monitoring depends on ACPI and clock modulation*/
- if (!cpu_has(c, X86_FEATURE_ACPI) || !cpu_has(c, X86_FEATURE_ACC))
+ /* Thermal monitoring depends on APIC, ACPI and clock modulation */
+ if (!cpu_has_apic || !cpu_has(c, X86_FEATURE_ACPI) ||
+ !cpu_has(c, X86_FEATURE_ACC))
return;
/*
* since it might be delivered via SMI already:
*/
rdmsr(MSR_IA32_MISC_ENABLE, l, h);
- h = apic_read(APIC_LVTTHMR);
+
+ /*
+ * The initial value of thermal LVT entries on all APs always reads
+ * 0x10000 because APs are woken up by BSP issuing INIT-SIPI-SIPI
+ * sequence to them and LVT registers are reset to 0s except for
+ * the mask bits which are set to 1s when APs receive INIT IPI.
+ * Always restore the value that BIOS has programmed on AP based on
+ * BSP's info we saved since BIOS is always setting the same value
+ * for all threads/cores
+ */
+ apic_write(APIC_LVTTHMR, lvtthmr_init);
+
+ h = lvtthmr_init;
+
if ((l & MSR_IA32_MISC_ENABLE_TM1) && (h & APIC_DM_SMI)) {
printk(KERN_DEBUG
"CPU%d: Thermal monitoring handled by SMI\n", cpu);
l = apic_read(APIC_LVTTHMR);
apic_write(APIC_LVTTHMR, l & ~APIC_LVT_MASKED);
- printk(KERN_INFO "CPU%d: Thermal monitoring enabled (%s)\n",
- cpu, tm2 ? "TM2" : "TM1");
+ printk_once(KERN_INFO "CPU0: Thermal monitoring enabled (%s)\n",
+ tm2 ? "TM2" : "TM1");
/* enable thermal throttle processing */
atomic_set(&therm_throt_en, 1);