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From: H. Peter Anvin on 5 Aug 2010 16:40
[ This topic needs to be merged after x86/cpu ]

Hi Linus,

The following changes since commit 9792db6174d9927700ed288e6d74b9391bf785d1:

x86, cpu: Package Level Thermal Control, Power Limit Notification definitions (2010-07-30 16:15:32 -0700)

are available in the git repository at:
git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip.git x86-hwmon-for-linus

Fenghua Yu (4):
x86, hwmon: Package Level Thermal/Power: pkgtemp hwmon driver
x86, hwmon: Package Level Thermal/Power: thermal throttling handler
x86, hwmon: Package Level Thermal/Power: power limit
x86, hwmon: Package Level Thermal/Power: pkgtemp documentation

Documentation/hwmon/pkgtemp | 36 +++
arch/x86/configs/i386_defconfig | 1 +
arch/x86/configs/x86_64_defconfig | 1 +
arch/x86/kernel/cpu/mcheck/therm_throt.c | 206 +++++++++++---
drivers/hwmon/Kconfig | 7 +
drivers/hwmon/Makefile | 1 +
drivers/hwmon/pkgtemp.c | 456 ++++++++++++++++++++++++++++++
7 files changed, 669 insertions(+), 39 deletions(-)
create mode 100644 Documentation/hwmon/pkgtemp
create mode 100644 drivers/hwmon/pkgtemp.c

diff --git a/Documentation/hwmon/pkgtemp b/Documentation/hwmon/pkgtemp
new file mode 100644
index 0000000..c8e1fb0
--- /dev/null
+++ b/Documentation/hwmon/pkgtemp
@@ -0,0 +1,36 @@
+Kernel driver pkgtemp
+======================
+
+Supported chips:
+ * Intel family
+ Prefix: 'pkgtemp'
+ CPUID:
+ Datasheet: Intel 64 and IA-32 Architectures Software Developer's Manual
+ Volume 3A: System Programming Guide
+
+Author: Fenghua Yu
+
+Description
+-----------
+
+This driver permits reading package level temperature sensor embedded inside
+Intel CPU package. The sensors can be in core, uncore, memory controller, or
+other components in a package. The feature is first implemented in Intel Sandy
+Bridge platform.
+
+Temperature is measured in degrees Celsius and measurement resolution is
+1 degree C. Valid temperatures are from 0 to TjMax degrees C, because the actual
+value of temperature register is in fact a delta from TjMax.
+
+Temperature known as TjMax is the maximum junction temperature of package.
+We get this from MSR_IA32_TEMPERATURE_TARGET. If the MSR is not accessible,
+we define TjMax as 100 degrees Celsius. At this temperature, protection
+mechanism will perform actions to forcibly cool down the package. Alarm
+may be raised, if the temperature grows enough (more than TjMax) to trigger
+the Out-Of-Spec bit. Following table summarizes the exported sysfs files:
+
+temp1_input - Package temperature (in millidegrees Celsius).
+temp1_max - All cooling devices should be turned on.
+temp1_crit - Maximum junction temperature (in millidegrees Celsius).
+temp1_crit_alarm - Set when Out-of-spec bit is set, never clears.
+ Correct CPU operation is no longer guaranteed.
diff --git a/arch/x86/configs/i386_defconfig b/arch/x86/configs/i386_defconfig
index d28fad1..e3a3243 100644
--- a/arch/x86/configs/i386_defconfig
+++ b/arch/x86/configs/i386_defconfig
@@ -1471,6 +1471,7 @@ CONFIG_HWMON=y
# CONFIG_SENSORS_GL518SM is not set
# CONFIG_SENSORS_GL520SM is not set
# CONFIG_SENSORS_CORETEMP is not set
+# CONFIG_SENSORS_PKGTEMP is not set
# CONFIG_SENSORS_IT87 is not set
# CONFIG_SENSORS_LM63 is not set
# CONFIG_SENSORS_LM75 is not set
diff --git a/arch/x86/configs/x86_64_defconfig b/arch/x86/configs/x86_64_defconfig
index 6c86acd..4251f83 100644
--- a/arch/x86/configs/x86_64_defconfig
+++ b/arch/x86/configs/x86_64_defconfig
@@ -1456,6 +1456,7 @@ CONFIG_HWMON=y
# CONFIG_SENSORS_GL518SM is not set
# CONFIG_SENSORS_GL520SM is not set
# CONFIG_SENSORS_CORETEMP is not set
+# CONFIG_SENSORS_PKGTEMP is not set
# CONFIG_SENSORS_IT87 is not set
# CONFIG_SENSORS_LM63 is not set
# CONFIG_SENSORS_LM75 is not set
diff --git a/arch/x86/kernel/cpu/mcheck/therm_throt.c b/arch/x86/kernel/cpu/mcheck/therm_throt.c
index e1a0a3b..c2a8b26 100644
--- a/arch/x86/kernel/cpu/mcheck/therm_throt.c
+++ b/arch/x86/kernel/cpu/mcheck/therm_throt.c
@@ -34,15 +34,25 @@
/* How long to wait between reporting thermal events */
#define CHECK_INTERVAL (300 * HZ)

+#define THERMAL_THROTTLING_EVENT 0
+#define POWER_LIMIT_EVENT 1
+
/*
- * Current thermal throttling state:
+ * Current thermal event state:
*/
-struct thermal_state {
- bool is_throttled;
-
+struct _thermal_state {
+ bool new_event;
+ int event;
u64 next_check;
- unsigned long throttle_count;
- unsigned long last_throttle_count;
+ unsigned long count;
+ unsigned long last_count;
+};
+
+struct thermal_state {
+ struct _thermal_state core_throttle;
+ struct _thermal_state core_power_limit;
+ struct _thermal_state package_throttle;
+ struct _thermal_state package_power_limit;
};

static DEFINE_PER_CPU(struct thermal_state, thermal_state);
@@ -53,11 +63,13 @@ 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(event, name) \
\
-static ssize_t therm_throt_sysdev_show_##name( \
+static ssize_t therm_throt_sysdev_show_##event##_##name( \
struct sys_device *dev, \
struct sysdev_attribute *attr, \
char *buf) \
@@ -66,30 +78,42 @@ 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).event.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(core_power_limit, count);
+define_therm_throt_sysdev_one_ro(core_power_limit_count);
+
+define_therm_throt_sysdev_show_func(package_throttle, count);
+define_therm_throt_sysdev_one_ro(package_throttle_count);
+
+define_therm_throt_sysdev_show_func(package_power_limit, count);
+define_therm_throt_sysdev_one_ro(package_power_limit_count);

static struct attribute *thermal_throttle_attrs[] = {
- &attr_throttle_count.attr,
+ &attr_core_throttle_count.attr,
NULL
};

-static struct attribute_group thermal_throttle_attr_group = {
+static struct attribute_group thermal_attr_group = {
.attrs = thermal_throttle_attrs,
.name = "thermal_throttle"
};
#endif /* CONFIG_SYSFS */

+#define CORE_LEVEL 0
+#define PACKAGE_LEVEL 1
+
/***
* therm_throt_process - Process thermal throttling event from interrupt
* @curr: Whether the condition is current or not (boolean), since the
@@ -106,39 +130,70 @@ 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)
+static int therm_throt_process(bool new_event, int event, int level)
{
- struct thermal_state *state;
- unsigned int this_cpu;
- bool was_throttled;
+ struct _thermal_state *state;
+ unsigned int this_cpu = smp_processor_id();
+ bool old_event;
u64 now;
+ struct thermal_state *pstate = &per_cpu(thermal_state, this_cpu);

- this_cpu = smp_processor_id();
now = get_jiffies_64();
- state = &per_cpu(thermal_state, this_cpu);
+ if (level == CORE_LEVEL) {
+ if (event == THERMAL_THROTTLING_EVENT)
+ state = &pstate->core_throttle;
+ else if (event == POWER_LIMIT_EVENT)
+ state = &pstate->core_power_limit;
+ else
+ return 0;
+ } else if (level == PACKAGE_LEVEL) {
+ if (event == THERMAL_THROTTLING_EVENT)
+ state = &pstate->package_throttle;
+ else if (event == POWER_LIMIT_EVENT)
+ state = &pstate->package_power_limit;
+ else
+ return 0;
+ } else
+ return 0;

- was_throttled = state->is_throttled;
- state->is_throttled = is_throttled;
+ old_event = state->new_event;
+ state->new_event = new_event;

- if (is_throttled)
- state->throttle_count++;
+ if (new_event)
+ state->count++;

if (time_before64(now, state->next_check) &&
- state->throttle_count != state->last_throttle_count)
+ state->count != state->last_count)
return 0;

state->next_check = now + CHECK_INTERVAL;
- state->last_throttle_count = state->throttle_count;
+ state->last_count = state->count;

/* 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);
+ if (new_event) {
+ if (event == THERMAL_THROTTLING_EVENT)
+ printk(KERN_CRIT "CPU%d: %s temperature above threshold, cpu clock throttled (total events = %lu)\n",
+ this_cpu,
+ level == CORE_LEVEL ? "Core" : "Package",
+ state->count);
+ else
+ printk(KERN_CRIT "CPU%d: %s power limit notification (total events = %lu)\n",
+ this_cpu,
+ level == CORE_LEVEL ? "Core" : "Package",
+ state->count);

add_taint(TAINT_MACHINE_CHECK);
return 1;
}
- if (was_throttled) {
- printk(KERN_INFO "CPU%d: Temperature/speed normal\n", this_cpu);
+ if (old_event) {
+ if (event == THERMAL_THROTTLING_EVENT)
+ printk(KERN_INFO "CPU%d: %s temperature/speed normal\n",
+ this_cpu,
+ level == CORE_LEVEL ? "Core" : "Package");
+ else
+ printk(KERN_INFO "CPU%d: %s power limit normal\n",
+ this_cpu,
+ level == CORE_LEVEL ? "Core" : "Package");
return 1;
}

@@ -149,13 +204,32 @@ 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_attr_group);
+ if (err)
+ return err;
+
+ if (cpu_has(c, X86_FEATURE_PLN))
+ err = sysfs_add_file_to_group(&sys_dev->kobj,
+ &attr_core_power_limit_count.attr,
+ thermal_attr_group.name);
+ if (cpu_has(c, X86_FEATURE_PTS))
+ err = sysfs_add_file_to_group(&sys_dev->kobj,
+ &attr_package_throttle_count.attr,
+ thermal_attr_group.name);
+ if (cpu_has(c, X86_FEATURE_PLN))
+ err = sysfs_add_file_to_group(&sys_dev->kobj,
+ &attr_package_power_limit_count.attr,
+ thermal_attr_group.name);
+
+ return err;
}

static __cpuinit void thermal_throttle_remove_dev(struct sys_device *sys_dev)
{
- sysfs_remove_group(&sys_dev->kobj, &thermal_throttle_attr_group);
+ sysfs_remove_group(&sys_dev->kobj, &thermal_attr_group);
}

/* Mutex protecting device creation against CPU hotplug: */
@@ -226,14 +300,50 @@ device_initcall(thermal_throttle_init_device);

#endif /* CONFIG_SYSFS */

+/*
+ * Set up the most two significant bit to notify mce log that this thermal
+ * event type.
+ * This is a temp solution. May be changed in the future with mce log
+ * infrasture.
+ */
+#define CORE_THROTTLED (0)
+#define CORE_POWER_LIMIT ((__u64)1 << 62)
+#define PACKAGE_THROTTLED ((__u64)2 << 62)
+#define PACKAGE_POWER_LIMIT ((__u64)3 << 62)
+
/* Thermal transition interrupt handler */
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))
- mce_log_therm_throt_event(msr_val);
+
+ if (therm_throt_process(msr_val & THERM_STATUS_PROCHOT,
+ THERMAL_THROTTLING_EVENT,
+ CORE_LEVEL) != 0)
+ mce_log_therm_throt_event(CORE_THROTTLED | msr_val);
+
+ if (cpu_has(c, X86_FEATURE_PLN))
+ if (therm_throt_process(msr_val & THERM_STATUS_POWER_LIMIT,
+ POWER_LIMIT_EVENT,
+ CORE_LEVEL) != 0)
+ mce_log_therm_throt_event(CORE_POWER_LIMIT | 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,
+ THERMAL_THROTTLING_EVENT,
+ PACKAGE_LEVEL) != 0)
+ mce_log_therm_throt_event(PACKAGE_THROTTLED | msr_val);
+ if (cpu_has(c, X86_FEATURE_PLN))
+ if (therm_throt_process(msr_val &
+ PACKAGE_THERM_STATUS_POWER_LIMIT,
+ POWER_LIMIT_EVENT,
+ PACKAGE_LEVEL) != 0)
+ mce_log_therm_throt_event(PACKAGE_POWER_LIMIT
+ | msr_val);
+ }
}

static void unexpected_thermal_interrupt(void)
@@ -335,8 +445,26 @@ void intel_init_thermal(struct cpuinfo_x86 *c)
apic_write(APIC_LVTTHMR, h);

rdmsr(MSR_IA32_THERM_INTERRUPT, l, h);
- wrmsr(MSR_IA32_THERM_INTERRUPT,
- l | (THERM_INT_LOW_ENABLE | THERM_INT_HIGH_ENABLE), h);
+ if (cpu_has(c, X86_FEATURE_PLN))
+ 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,
+ 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);
+ if (cpu_has(c, X86_FEATURE_PLN))
+ wrmsr(MSR_IA32_PACKAGE_THERM_INTERRUPT,
+ l | (PACKAGE_THERM_INT_LOW_ENABLE
+ | PACKAGE_THERM_INT_HIGH_ENABLE
+ | PACKAGE_THERM_INT_PLN_ENABLE), h);
+ else
+ wrmsr(MSR_IA32_PACKAGE_THERM_INTERRUPT,
+ l | (PACKAGE_THERM_INT_LOW_ENABLE
+ | PACKAGE_THERM_INT_HIGH_ENABLE), h);
+ }

smp_thermal_vector = intel_thermal_interrupt;

diff --git a/drivers/hwmon/Kconfig b/drivers/hwmon/Kconfig
index e19cf8e..3a858e8 100644
--- a/drivers/hwmon/Kconfig
+++ b/drivers/hwmon/Kconfig
@@ -407,6 +407,13 @@ config SENSORS_CORETEMP
sensor inside your CPU. Most of the family 6 CPUs
are supported. Check documentation/driver for details.

+config SENSORS_PKGTEMP
+ tristate "Intel processor package temperature sensor"
+ depends on X86 && PCI && EXPERIMENTAL
+ help
+ If you say yes here you get support for the package level temperature
+ sensor inside your CPU. Check documentation/driver for details.
+
config SENSORS_IBMAEM
tristate "IBM Active Energy Manager temperature/power sensors and control"
select IPMI_SI
diff --git a/drivers/hwmon/Makefile b/drivers/hwmon/Makefile
index 2138ceb..879814e 100644
--- a/drivers/hwmon/Makefile
+++ b/drivers/hwmon/Makefile
@@ -39,6 +39,7 @@ obj-$(CONFIG_SENSORS_AMS) += ams/
obj-$(CONFIG_SENSORS_ASC7621) += asc7621.o
obj-$(CONFIG_SENSORS_ATXP1) += atxp1.o
obj-$(CONFIG_SENSORS_CORETEMP) += coretemp.o
+obj-$(CONFIG_SENSORS_PKGTEMP) += pkgtemp.o
obj-$(CONFIG_SENSORS_DME1737) += dme1737.o
obj-$(CONFIG_SENSORS_DS1621) += ds1621.o
obj-$(CONFIG_SENSORS_EMC1403) += emc1403.o
diff --git a/drivers/hwmon/pkgtemp.c b/drivers/hwmon/pkgtemp.c
new file mode 100644
index 0000000..74157fc
--- /dev/null
+++ b/drivers/hwmon/pkgtemp.c
@@ -0,0 +1,456 @@
+/*
+ * pkgtemp.c - Linux kernel module for processor package hardware monitoring
+ *
+ * Copyright (C) 2010 Fenghua Yu <fenghua.yu(a)intel.com>
+ *
+ * Inspired from many hwmon drivers especially coretemp.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; version 2 of the License.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+ * 02110-1301 USA.
+ */
+
+#include <linux/module.h>
+#include <linux/delay.h>
+#include <linux/init.h>
+#include <linux/slab.h>
+#include <linux/jiffies.h>
+#include <linux/hwmon.h>
+#include <linux/sysfs.h>
+#include <linux/hwmon-sysfs.h>
+#include <linux/err.h>
+#include <linux/mutex.h>
+#include <linux/list.h>
+#include <linux/platform_device.h>
+#include <linux/cpu.h>
+#include <linux/pci.h>
+#include <asm/msr.h>
+#include <asm/processor.h>
+
+#define DRVNAME "pkgtemp"
+
+enum { SHOW_TEMP, SHOW_TJMAX, SHOW_TTARGET, SHOW_LABEL, SHOW_NAME };
+
+/*
+ * Functions declaration
+ */
+
+static struct pkgtemp_data *pkgtemp_update_device(struct device *dev);
+
+struct pkgtemp_data {
+ struct device *hwmon_dev;
+ struct mutex update_lock;
+ const char *name;
+ u32 id;
+ u16 phys_proc_id;
+ char valid; /* zero until following fields are valid */
+ unsigned long last_updated; /* in jiffies */
+ int temp;
+ int tjmax;
+ int ttarget;
+ u8 alarm;
+};
+
+/*
+ * Sysfs stuff
+ */
+
+static ssize_t show_name(struct device *dev, struct device_attribute
+ *devattr, char *buf)
+{
+ int ret;
+ struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
+ struct pkgtemp_data *data = dev_get_drvdata(dev);
+
+ if (attr->index == SHOW_NAME)
+ ret = sprintf(buf, "%s\n", data->name);
+ else /* show label */
+ ret = sprintf(buf, "physical id %d\n",
+ data->phys_proc_id);
+ return ret;
+}
+
+static ssize_t show_alarm(struct device *dev, struct device_attribute
+ *devattr, char *buf)
+{
+ struct pkgtemp_data *data = pkgtemp_update_device(dev);
+ /* read the Out-of-spec log, never clear */
+ return sprintf(buf, "%d\n", data->alarm);
+}
+
+static ssize_t show_temp(struct device *dev,
+ struct device_attribute *devattr, char *buf)
+{
+ struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
+ struct pkgtemp_data *data = pkgtemp_update_device(dev);
+ int err = 0;
+
+ if (attr->index == SHOW_TEMP)
+ err = data->valid ? sprintf(buf, "%d\n", data->temp) : -EAGAIN;
+ else if (attr->index == SHOW_TJMAX)
+ err = sprintf(buf, "%d\n", data->tjmax);
+ else
+ err = sprintf(buf, "%d\n", data->ttarget);
+ return err;
+}
+
+static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, show_temp, NULL, SHOW_TEMP);
+static SENSOR_DEVICE_ATTR(temp1_crit, S_IRUGO, show_temp, NULL, SHOW_TJMAX);
+static SENSOR_DEVICE_ATTR(temp1_max, S_IRUGO, show_temp, NULL, SHOW_TTARGET);
+static DEVICE_ATTR(temp1_crit_alarm, S_IRUGO, show_alarm, NULL);
+static SENSOR_DEVICE_ATTR(temp1_label, S_IRUGO, show_name, NULL, SHOW_LABEL);
+static SENSOR_DEVICE_ATTR(name, S_IRUGO, show_name, NULL, SHOW_NAME);
+
+static struct attribute *pkgtemp_attributes[] = {
+ &sensor_dev_attr_name.dev_attr.attr,
+ &sensor_dev_attr_temp1_label.dev_attr.attr,
+ &dev_attr_temp1_crit_alarm.attr,
+ &sensor_dev_attr_temp1_input.dev_attr.attr,
+ &sensor_dev_attr_temp1_crit.dev_attr.attr,
+ NULL
+};
+
+static const struct attribute_group pkgtemp_group = {
+ .attrs = pkgtemp_attributes,
+};
+
+static struct pkgtemp_data *pkgtemp_update_device(struct device *dev)
+{
+ struct pkgtemp_data *data = dev_get_drvdata(dev);
+ unsigned int cpu;
+ int err;
+
+ mutex_lock(&data->update_lock);
+
+ if (!data->valid || time_after(jiffies, data->last_updated + HZ)) {
+ u32 eax, edx;
+
+ data->valid = 0;
+ cpu = data->id;
+ err = rdmsr_on_cpu(cpu, MSR_IA32_PACKAGE_THERM_STATUS,
+ &eax, &edx);
+ if (!err) {
+ data->alarm = (eax >> 5) & 1;
+ data->temp = data->tjmax - (((eax >> 16)
+ & 0x7f) * 1000);
+ data->valid = 1;
+ } else
+ dev_dbg(dev, "Temperature data invalid (0x%x)\n", eax);
+
+ data->last_updated = jiffies;
+ }
+
+ mutex_unlock(&data->update_lock);
+ return data;
+}
+
+static int get_tjmax(int cpu, struct device *dev)
+{
+ int default_tjmax = 100000;
+ int err;
+ u32 eax, edx;
+ u32 val;
+
+ /* IA32_TEMPERATURE_TARGET contains the TjMax value */
+ err = rdmsr_safe_on_cpu(cpu, MSR_IA32_TEMPERATURE_TARGET, &eax, &edx);
+ if (!err) {
+ val = (eax >> 16) & 0xff;
+ if ((val > 80) && (val < 120)) {
+ dev_info(dev, "TjMax is %d C.\n", val);
+ return val * 1000;
+ }
+ }
+ dev_warn(dev, "Unable to read TjMax from CPU.\n");
+ return default_tjmax;
+}
+
+static int __devinit pkgtemp_probe(struct platform_device *pdev)
+{
+ struct pkgtemp_data *data;
+ int err;
+ u32 eax, edx;
+#ifdef CONFIG_SMP
+ struct cpuinfo_x86 *c = &cpu_data(pdev->id);
+#endif
+
+ data = kzalloc(sizeof(struct pkgtemp_data), GFP_KERNEL);
+ if (!data) {
+ err = -ENOMEM;
+ dev_err(&pdev->dev, "Out of memory\n");
+ goto exit;
+ }
+
+ data->id = pdev->id;
+#ifdef CONFIG_SMP
+ data->phys_proc_id = c->phys_proc_id;
+#endif
+ data->name = "pkgtemp";
+ mutex_init(&data->update_lock);
+
+ /* test if we can access the THERM_STATUS MSR */
+ err = rdmsr_safe_on_cpu(data->id, MSR_IA32_PACKAGE_THERM_STATUS,
+ &eax, &edx);
+ if (err) {
+ dev_err(&pdev->dev,
+ "Unable to access THERM_STATUS MSR, giving up\n");
+ goto exit_free;
+ }
+
+ data->tjmax = get_tjmax(data->id, &pdev->dev);
+ platform_set_drvdata(pdev, data);
+
+ err = rdmsr_safe_on_cpu(data->id, MSR_IA32_TEMPERATURE_TARGET,
+ &eax, &edx);
+ if (err) {
+ dev_warn(&pdev->dev, "Unable to read"
+ " IA32_TEMPERATURE_TARGET MSR\n");
+ } else {
+ data->ttarget = data->tjmax - (((eax >> 8) & 0xff) * 1000);
+ err = device_create_file(&pdev->dev,
+ &sensor_dev_attr_temp1_max.dev_attr);
+ if (err)
+ goto exit_free;
+ }
+
+ err = sysfs_create_group(&pdev->dev.kobj, &pkgtemp_group);
+ if (err)
+ goto exit_free;
+
+ data->hwmon_dev = hwmon_device_register(&pdev->dev);
+ if (IS_ERR(data->hwmon_dev)) {
+ err = PTR_ERR(data->hwmon_dev);
+ dev_err(&pdev->dev, "Class registration failed (%d)\n",
+ err);
+ goto exit_class;
+ }
+
+ return 0;
+
+exit_class:
+ sysfs_remove_group(&pdev->dev.kobj, &pkgtemp_group);
+exit_free:
+ kfree(data);
+exit:
+ return err;
+}
+
+static int __devexit pkgtemp_remove(struct platform_device *pdev)
+{
+ struct pkgtemp_data *data = platform_get_drvdata(pdev);
+
+ hwmon_device_unregister(data->hwmon_dev);
+ sysfs_remove_group(&pdev->dev.kobj, &pkgtemp_group);
+ platform_set_drvdata(pdev, NULL);
+ kfree(data);
+ return 0;
+}
+
+static struct platform_driver pkgtemp_driver = {
+ .driver = {
+ .owner = THIS_MODULE,
+ .name = DRVNAME,
+ },
+ .probe = pkgtemp_probe,
+ .remove = __devexit_p(pkgtemp_remove),
+};
+
+struct pdev_entry {
+ struct list_head list;
+ struct platform_device *pdev;
+ unsigned int cpu;
+#ifdef CONFIG_SMP
+ u16 phys_proc_id;
+#endif
+};
+
+static LIST_HEAD(pdev_list);
+static DEFINE_MUTEX(pdev_list_mutex);
+
+static int __cpuinit pkgtemp_device_add(unsigned int cpu)
+{
+ int err;
+ struct platform_device *pdev;
+ struct pdev_entry *pdev_entry;
+#ifdef CONFIG_SMP
+ struct cpuinfo_x86 *c = &cpu_data(cpu);
+#endif
+
+ mutex_lock(&pdev_list_mutex);
+
+#ifdef CONFIG_SMP
+ /* Only keep the first entry in each package */
+ list_for_each_entry(pdev_entry, &pdev_list, list) {
+ if (c->phys_proc_id == pdev_entry->phys_proc_id) {
+ err = 0; /* Not an error */
+ goto exit;
+ }
+ }
+#endif
+
+ pdev = platform_device_alloc(DRVNAME, cpu);
+ if (!pdev) {
+ err = -ENOMEM;
+ printk(KERN_ERR DRVNAME ": Device allocation failed\n");
+ goto exit;
+ }
+
+ pdev_entry = kzalloc(sizeof(struct pdev_entry), GFP_KERNEL);
+ if (!pdev_entry) {
+ err = -ENOMEM;
+ goto exit_device_put;
+ }
+
+ err = platform_device_add(pdev);
+ if (err) {
+ printk(KERN_ERR DRVNAME ": Device addition failed (%d)\n",
+ err);
+ goto exit_device_free;
+ }
+
+#ifdef CONFIG_SMP
+ pdev_entry->phys_proc_id = c->phys_proc_id;
+#endif
+ pdev_entry->pdev = pdev;
+ pdev_entry->cpu = cpu;
+ list_add_tail(&pdev_entry->list, &pdev_list);
+ mutex_unlock(&pdev_list_mutex);
+
+ return 0;
+
+exit_device_free:
+ kfree(pdev_entry);
+exit_device_put:
+ platform_device_put(pdev);
+exit:
+ mutex_unlock(&pdev_list_mutex);
+ return err;
+}
+
+#ifdef CONFIG_HOTPLUG_CPU
+static void pkgtemp_device_remove(unsigned int cpu)
+{
+ struct pdev_entry *p, *n;
+ unsigned int i;
+ int err;
+
+ mutex_lock(&pdev_list_mutex);
+ list_for_each_entry_safe(p, n, &pdev_list, list) {
+ if (p->cpu != cpu)
+ continue;
+
+ platform_device_unregister(p->pdev);
+ list_del(&p->list);
+ kfree(p);
+ for_each_cpu(i, cpu_core_mask(cpu)) {
+ if (i != cpu) {
+ err = pkgtemp_device_add(i);
+ if (!err)
+ break;
+ }
+ }
+ break;
+ }
+ mutex_unlock(&pdev_list_mutex);
+}
+
+static int __cpuinit pkgtemp_cpu_callback(struct notifier_block *nfb,
+ unsigned long action, void *hcpu)
+{
+ unsigned int cpu = (unsigned long) hcpu;
+
+ switch (action) {
+ case CPU_ONLINE:
+ case CPU_DOWN_FAILED:
+ pkgtemp_device_add(cpu);
+ break;
+ case CPU_DOWN_PREPARE:
+ pkgtemp_device_remove(cpu);
+ break;
+ }
+ return NOTIFY_OK;
+}
+
+static struct notifier_block pkgtemp_cpu_notifier __refdata = {
+ .notifier_call = pkgtemp_cpu_callback,
+};
+#endif /* !CONFIG_HOTPLUG_CPU */
+
+static int __init pkgtemp_init(void)
+{
+ int i, err = -ENODEV;
+ struct pdev_entry *p, *n;
+
+ /* quick check if we run Intel */
+ if (cpu_data(0).x86_vendor != X86_VENDOR_INTEL)
+ goto exit;
+
+ err = platform_driver_register(&pkgtemp_driver);
+ if (err)
+ goto exit;
+
+ for_each_online_cpu(i) {
+ struct cpuinfo_x86 *c = &cpu_data(i);
+
+ if (!cpu_has(c, X86_FEATURE_PTS))
+ continue;
+
+ err = pkgtemp_device_add(i);
+ if (err)
+ goto exit_devices_unreg;
+ }
+ if (list_empty(&pdev_list)) {
+ err = -ENODEV;
+ goto exit_driver_unreg;
+ }
+
+#ifdef CONFIG_HOTPLUG_CPU
+ register_hotcpu_notifier(&pkgtemp_cpu_notifier);
+#endif
+ return 0;
+
+exit_devices_unreg:
+ mutex_lock(&pdev_list_mutex);
+ list_for_each_entry_safe(p, n, &pdev_list, list) {
+ platform_device_unregister(p->pdev);
+ list_del(&p->list);
+ kfree(p);
+ }
+ mutex_unlock(&pdev_list_mutex);
+exit_driver_unreg:
+ platform_driver_unregister(&pkgtemp_driver);
+exit:
+ return err;
+}
+
+static void __exit pkgtemp_exit(void)
+{
+ struct pdev_entry *p, *n;
+#ifdef CONFIG_HOTPLUG_CPU
+ unregister_hotcpu_notifier(&pkgtemp_cpu_notifier);
+#endif
+ mutex_lock(&pdev_list_mutex);
+ list_for_each_entry_safe(p, n, &pdev_list, list) {
+ platform_device_unregister(p->pdev);
+ list_del(&p->list);
+ kfree(p);
+ }
+ mutex_unlock(&pdev_list_mutex);
+ platform_driver_unregister(&pkgtemp_driver);
+}
+
+MODULE_AUTHOR("Fenghua Yu <fenghua.yu(a)intel.com>");
+MODULE_DESCRIPTION("Intel processor package temperature monitor");
+MODULE_LICENSE("GPL");
+
+module_init(pkgtemp_init)
+module_exit(pkgtemp_exit)
--
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