[tip:x86/hwmon] x86, hwmon: Package Level Thermal/Power: thermal throttling handler

[tip-bot for Fenghua Yu <fenghua.yu@intel.com>]

Commit-ID:  55d435a227bd28c77afab326de44dfacc0b15059
Gitweb:     http://git.kernel.org/tip/55d435a227bd28c77afab326de44dfacc0b15059
Author:     Fenghua Yu <fenghua.yu@intel.com>
AuthorDate: Thu, 29 Jul 2010 17:13:44 -0700
Committer:  H. Peter Anvin <hpa@linux.intel.com>
CommitDate: Tue, 3 Aug 2010 15:58:56 -0700

x86, hwmon: Package Level Thermal/Power: thermal throttling handler

Add package level thermal throttle interrupt support. The interrupt handler
increases package level thermal throttle count. It also logs the event in MCE
log.

The package level thermal throttle interrupt happens across threads in a
package. Each thread handles the interrupt individually. User level application
is supposed to retrieve correct event count and log based on package/thread
topology. This is the same situation for core level interrupt handler. In the
future, interrupt may be reported only per package or per core.

core_throttle_count and package_throttle_count are used for user interface.
Previously only throttle_count is used for core throttle count. If you think
new core_throttle_count name breaks user interface, I can change this part.

Signed-off-by: Fenghua Yu <fenghua.yu@intel.com>
LKML-Reference: <1280448826-12004-4-git-send-email-fenghua.yu@intel.com>
Reviewed-by: Len Brown <len.brown@intel.com>
Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
---
 arch/x86/kernel/cpu/mcheck/therm_throt.c |   89 ++++++++++++++++++++++++------
 1 files changed, 71 insertions(+), 18 deletions(-)

diff --git a/arch/x86/kernel/cpu/mcheck/therm_throt.c b/arch/x86/kernel/cpu/mcheck/therm_throt.c
index e1a0a3b..d307f9f 100644
--- a/arch/x86/kernel/cpu/mcheck/therm_throt.c
+++ b/arch/x86/kernel/cpu/mcheck/therm_throt.c
@@ -37,7 +37,7 @@
 /*
  * Current thermal throttling state:
  */
-struct thermal_state {
+struct _thermal_state {
 	bool			is_throttled;
 
 	u64			next_check;
@@ -45,6 +45,11 @@ struct thermal_state {
 	unsigned long		last_throttle_count;
 };
 
+struct thermal_state {
+	struct _thermal_state core;
+	struct _thermal_state package;
+};
+
 static DEFINE_PER_CPU(struct thermal_state, thermal_state);
 
 static atomic_t therm_throt_en	= ATOMIC_INIT(0);
@@ -53,11 +58,13 @@ 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)
+	static SYSDEV_ATTR(_name, 0444,					\
+			   therm_throt_sysdev_show_##_name,		\
+				   NULL)				\
 
-#define define_therm_throt_sysdev_show_func(name)			\
+#define define_therm_throt_sysdev_show_func(level, name)		\
 									\
-static ssize_t therm_throt_sysdev_show_##name(				\
+static ssize_t therm_throt_sysdev_show_##level##_##name(		\
 			struct sys_device *dev,				\
 			struct sysdev_attribute *attr,			\
 			char *buf)					\
@@ -66,21 +73,24 @@ static ssize_t therm_throt_sysdev_show_##name(				\
 	ssize_t ret;							\
 									\
 	preempt_disable();	/* CPU hotplug */			\
-	if (cpu_online(cpu))						\
+	if (cpu_online(cpu)) {						\
 		ret = sprintf(buf, "%lu\n",				\
-			      per_cpu(thermal_state, cpu).name);	\
-	else								\
+			      per_cpu(thermal_state, cpu).level.name);	\
+	} else								\
 		ret = 0;						\
 	preempt_enable();						\
 									\
 	return ret;							\
 }
 
-define_therm_throt_sysdev_show_func(throttle_count);
-define_therm_throt_sysdev_one_ro(throttle_count);
+define_therm_throt_sysdev_show_func(core, throttle_count);
+define_therm_throt_sysdev_one_ro(core_throttle_count);
+
+define_therm_throt_sysdev_show_func(package, throttle_count);
+define_therm_throt_sysdev_one_ro(package_throttle_count);
 
 static struct attribute *thermal_throttle_attrs[] = {
-	&attr_throttle_count.attr,
+	&attr_core_throttle_count.attr,
 	NULL
 };
 
@@ -106,16 +116,21 @@ static struct attribute_group thermal_throttle_attr_group = {
  *          1 : Event should be logged further, and a message has been
  *              printed to the syslog.
  */
-static int therm_throt_process(bool is_throttled)
+#define CORE_LEVEL	0
+#define PACKAGE_LEVEL	1
+static int therm_throt_process(bool is_throttled, int level)
 {
-	struct thermal_state *state;
+	struct _thermal_state *state;
 	unsigned int this_cpu;
 	bool was_throttled;
 	u64 now;
 
 	this_cpu = smp_processor_id();
 	now = get_jiffies_64();
-	state = &per_cpu(thermal_state, this_cpu);
+	if (level == CORE_LEVEL)
+		state = &per_cpu(thermal_state, this_cpu).core;
+	else
+		state = &per_cpu(thermal_state, this_cpu).package;
 
 	was_throttled = state->is_throttled;
 	state->is_throttled = is_throttled;
@@ -132,13 +147,18 @@ static int therm_throt_process(bool is_throttled)
 
 	/* if we just entered the thermal event */
 	if (is_throttled) {
-		printk(KERN_CRIT "CPU%d: Temperature above threshold, cpu clock throttled (total events = %lu)\n", this_cpu, state->throttle_count);
+		printk(KERN_CRIT "CPU%d: %s temperature above threshold, cpu clock throttled (total events = %lu)\n",
+		      this_cpu,
+		      level == CORE_LEVEL ? "Core" : "Package",
+		      state->throttle_count);
 
 		add_taint(TAINT_MACHINE_CHECK);
 		return 1;
 	}
 	if (was_throttled) {
-		printk(KERN_INFO "CPU%d: Temperature/speed normal\n", this_cpu);
+		printk(KERN_INFO "CPU%d: %s temperature/speed normal\n",
+		       this_cpu,
+		       level == CORE_LEVEL ? "Core" : "Package");
 		return 1;
 	}
 
@@ -149,8 +169,19 @@ static int therm_throt_process(bool is_throttled)
 /* Add/Remove thermal_throttle interface for CPU device: */
 static __cpuinit int thermal_throttle_add_dev(struct sys_device *sys_dev)
 {
-	return sysfs_create_group(&sys_dev->kobj,
-				  &thermal_throttle_attr_group);
+	int err;
+	struct cpuinfo_x86 *c = &cpu_data(smp_processor_id());
+
+	err = sysfs_create_group(&sys_dev->kobj, &thermal_throttle_attr_group);
+	if (err)
+		return err;
+
+	if (cpu_has(c, X86_FEATURE_PTS))
+		err = sysfs_add_file_to_group(&sys_dev->kobj,
+					      &attr_package_throttle_count.attr,
+					      thermal_throttle_attr_group.name);
+
+	return err;
 }
 
 static __cpuinit void thermal_throttle_remove_dev(struct sys_device *sys_dev)
@@ -230,10 +261,25 @@ device_initcall(thermal_throttle_init_device);
 static void intel_thermal_interrupt(void)
 {
 	__u64 msr_val;
+	struct cpuinfo_x86 *c = &cpu_data(smp_processor_id());
 
 	rdmsrl(MSR_IA32_THERM_STATUS, msr_val);
-	if (therm_throt_process((msr_val & THERM_STATUS_PROCHOT) != 0))
+	if (therm_throt_process(msr_val & THERM_STATUS_PROCHOT,
+				CORE_LEVEL) != 0)
 		mce_log_therm_throt_event(msr_val);
+
+	if (cpu_has(c, X86_FEATURE_PTS)) {
+		rdmsrl(MSR_IA32_PACKAGE_THERM_STATUS, msr_val);
+		if (therm_throt_process(msr_val & PACKAGE_THERM_STATUS_PROCHOT,
+					PACKAGE_LEVEL) != 0)
+			/*
+			 * Set up the most significant bit to notify mce log
+			 * that this thermal event is a package level event.
+			 * This is a temp solution. May be changed in the future
+			 * with mce log infrasture.
+			 */
+			mce_log_therm_throt_event(((__u64)1 << 63) | msr_val);
+	}
 }
 
 static void unexpected_thermal_interrupt(void)
@@ -338,6 +384,13 @@ void intel_init_thermal(struct cpuinfo_x86 *c)
 	wrmsr(MSR_IA32_THERM_INTERRUPT,
 		l | (THERM_INT_LOW_ENABLE | THERM_INT_HIGH_ENABLE), h);
 
+	if (cpu_has(c, X86_FEATURE_PTS)) {
+		rdmsr(MSR_IA32_PACKAGE_THERM_INTERRUPT, l, h);
+		wrmsr(MSR_IA32_PACKAGE_THERM_INTERRUPT,
+			l | (PACKAGE_THERM_INT_LOW_ENABLE
+		  | PACKAGE_THERM_INT_HIGH_ENABLE), h);
+	}
+
 	smp_thermal_vector = intel_thermal_interrupt;
 
 	rdmsr(MSR_IA32_MISC_ENABLE, l, h);