/* * pkgtemp.c - Linux kernel module for processor package hardware monitoring * * Copyright (C) 2010 Fenghua Yu * * 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 #include #include #include #include #include #include #include #include #include #include #include #include #include #include #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 "); MODULE_DESCRIPTION("Intel processor package temperature monitor"); MODULE_LICENSE("GPL"); module_init(pkgtemp_init) module_exit(pkgtemp_exit)