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x86 thermal: Disable power limit notification interrupt by default

Browse source 
The package power limit notification interrupt is primarily for
system diagnosis, and should not be blindly enabled on every
system by default -- particuarly since Linux does nothing in the
handler except count how many times it has been called...

Add a new kernel cmdline parameter "int_pln_enable" for situations where
users want to oberve these events via existing system counters:

$ grep TRM /proc/interrupts

$ grep . /sys/devices/system/cpu/cpu*/thermal_throttle/*

https://bugzilla.kernel.org/show_bug.cgi?id=36182

Signed-off-by: Fenghua Yu <fenghua.yu@intel.com>
Signed-off-by: Len Brown <len.brown@intel.com>
Signed-off-by: Tony Luck <tony.luck@intel.com>
This commit is contained in:
Fenghua Yu 2013-05-21 15:35:17 -04:00 committed by Tony Luck
parent c81147483e
commit 6bb2ff846f
2 changed files with 28 additions and 8 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

2
Documentation/kernel-parameters.txt
View file

@ -1158,6 +1158,8 @@ bytes respectively. Such letter suffixes can also be entirely omitted.
inport.irq= [HW] Inport (ATI XL and Microsoft) busmouse driver
Format: <irq>
int_pln_enable [x86] Enable power limit notification interrupt
intel_iommu= [DMAR] Intel IOMMU driver (DMAR) option
on
Enable intel iommu driver.

34
arch/x86/kernel/cpu/mcheck/therm_throt.c
View file

@ -210,6 +210,15 @@ static int thresh_event_valid(int event)
return 1;
}
static bool int_pln_enable;
static int __init int_pln_enable_setup(char *s)
{
int_pln_enable = true;
return 1;
}
__setup("int_pln_enable", int_pln_enable_setup);
#ifdef CONFIG_SYSFS
/* Add/Remove thermal_throttle interface for CPU device: */
static __cpuinit int thermal_throttle_add_dev(struct device *dev,
@ -222,7 +231,7 @@ static __cpuinit int thermal_throttle_add_dev(struct device *dev,
if (err)
return err;
if (cpu_has(c, X86_FEATURE_PLN))
if (cpu_has(c, X86_FEATURE_PLN) && int_pln_enable)
err = sysfs_add_file_to_group(&dev->kobj,
&dev_attr_core_power_limit_count.attr,
thermal_attr_group.name);
@ -230,7 +239,7 @@ static __cpuinit int thermal_throttle_add_dev(struct device *dev,
err = sysfs_add_file_to_group(&dev->kobj,
&dev_attr_package_throttle_count.attr,
thermal_attr_group.name);
if (cpu_has(c, X86_FEATURE_PLN))
if (cpu_has(c, X86_FEATURE_PLN) && int_pln_enable)
err = sysfs_add_file_to_group(&dev->kobj,
&dev_attr_package_power_limit_count.attr,
thermal_attr_group.name);
@ -343,7 +352,7 @@ static void intel_thermal_interrupt(void)
CORE_LEVEL) != 0)
mce_log_therm_throt_event(msr_val);
if (this_cpu_has(X86_FEATURE_PLN))
if (this_cpu_has(X86_FEATURE_PLN) && int_pln_enable)
therm_throt_process(msr_val & THERM_STATUS_POWER_LIMIT,
POWER_LIMIT_EVENT,
CORE_LEVEL);
@ -353,7 +362,7 @@ static void intel_thermal_interrupt(void)
therm_throt_process(msr_val & PACKAGE_THERM_STATUS_PROCHOT,
THERMAL_THROTTLING_EVENT,
PACKAGE_LEVEL);
if (this_cpu_has(X86_FEATURE_PLN))
if (this_cpu_has(X86_FEATURE_PLN) && int_pln_enable)
therm_throt_process(msr_val &
PACKAGE_THERM_STATUS_POWER_LIMIT,
POWER_LIMIT_EVENT,
@ -461,9 +470,13 @@ void intel_init_thermal(struct cpuinfo_x86 *c)
apic_write(APIC_LVTTHMR, h);
rdmsr(MSR_IA32_THERM_INTERRUPT, l, h);
if (cpu_has(c, X86_FEATURE_PLN))
if (cpu_has(c, X86_FEATURE_PLN) && !int_pln_enable)
wrmsr(MSR_IA32_THERM_INTERRUPT,
l | (THERM_INT_LOW_ENABLE
(l | (THERM_INT_LOW_ENABLE
| THERM_INT_HIGH_ENABLE)) & ~THERM_INT_PLN_ENABLE, h);
else if (cpu_has(c, X86_FEATURE_PLN) && int_pln_enable)
wrmsr(MSR_IA32_THERM_INTERRUPT,
l | (THERM_INT_LOW_ENABLE
| THERM_INT_HIGH_ENABLE | THERM_INT_PLN_ENABLE), h);
else
wrmsr(MSR_IA32_THERM_INTERRUPT,
@ -471,9 +484,14 @@ void intel_init_thermal(struct cpuinfo_x86 *c)
if (cpu_has(c, X86_FEATURE_PTS)) {
rdmsr(MSR_IA32_PACKAGE_THERM_INTERRUPT, l, h);
if (cpu_has(c, X86_FEATURE_PLN))
if (cpu_has(c, X86_FEATURE_PLN) && !int_pln_enable)
wrmsr(MSR_IA32_PACKAGE_THERM_INTERRUPT,
l | (PACKAGE_THERM_INT_LOW_ENABLE
(l | (PACKAGE_THERM_INT_LOW_ENABLE
| PACKAGE_THERM_INT_HIGH_ENABLE))
& ~PACKAGE_THERM_INT_PLN_ENABLE, h);
else if (cpu_has(c, X86_FEATURE_PLN) && int_pln_enable)
wrmsr(MSR_IA32_PACKAGE_THERM_INTERRUPT,
l | (PACKAGE_THERM_INT_LOW_ENABLE
| PACKAGE_THERM_INT_HIGH_ENABLE
| PACKAGE_THERM_INT_PLN_ENABLE), h);
else