+++ /dev/null
-/*
- * pkgtemp.c - Linux kernel module for processor package hardware monitoring
- *
- * Copyright (C) 2010 Fenghua Yu <fenghua.yu@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.
- */
-
-#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
-
-#include <linux/module.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 <asm/msr.h>
-#include <asm/processor.h>
-#include <asm/smp.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_dev;
-
- 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_dev:
- device_remove_file(&pdev->dev, &sensor_dev_attr_temp1_max.dev_attr);
-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);
- device_remove_file(&pdev->dev, &sensor_dev_attr_temp1_max.dev_attr);
- 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;
- struct cpuinfo_x86 *c = &cpu_data(cpu);
-
- if (!cpu_has(c, X86_FEATURE_PTS))
- return 0;
-
- 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;
- pr_err("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) {
- pr_err("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;
-}
-
-static void __cpuinit pkgtemp_device_remove(unsigned int cpu)
-{
- struct pdev_entry *p;
- unsigned int i;
- int err;
-
- mutex_lock(&pdev_list_mutex);
- list_for_each_entry(p, &pdev_list, list) {
- if (p->cpu != cpu)
- continue;
-
- platform_device_unregister(p->pdev);
- list_del(&p->list);
- mutex_unlock(&pdev_list_mutex);
- kfree(p);
- for_each_cpu(i, cpu_core_mask(cpu)) {
- if (i != cpu) {
- err = pkgtemp_device_add(i);
- if (!err)
- break;
- }
- }
- return;
- }
- 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,
-};
-
-static int __init pkgtemp_init(void)
-{
- int i, err = -ENODEV;
-
- /* 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)
- pkgtemp_device_add(i);
-
-#ifndef CONFIG_HOTPLUG_CPU
- if (list_empty(&pdev_list)) {
- err = -ENODEV;
- goto exit_driver_unreg;
- }
-#endif
-
- register_hotcpu_notifier(&pkgtemp_cpu_notifier);
- return 0;
-
-#ifndef CONFIG_HOTPLUG_CPU
-exit_driver_unreg:
- platform_driver_unregister(&pkgtemp_driver);
-#endif
-exit:
- return err;
-}
-
-static void __exit pkgtemp_exit(void)
-{
- struct pdev_entry *p, *n;
-
- unregister_hotcpu_notifier(&pkgtemp_cpu_notifier);
- 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@intel.com>");
-MODULE_DESCRIPTION("Intel processor package temperature monitor");
-MODULE_LICENSE("GPL");
-
-module_init(pkgtemp_init)
-module_exit(pkgtemp_exit)
projects / karo-tx-linux.git / commitdiff