/* * k10temp.c - AMD Family 10h/11h processor hardware monitoring * * Copyright (c) 2009 Clemens Ladisch <clemens@ladisch.de> * * * This driver is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License; either * version 2 of the License, or (at your option) any later version. * * This driver 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 driver; if not, see <http://www.gnu.org/licenses/>. */ #include <linux/err.h> #include <linux/hwmon.h> #include <linux/hwmon-sysfs.h> #include <linux/init.h> #include <linux/module.h> #include <linux/pci.h> #include <asm/processor.h> MODULE_DESCRIPTION("AMD Family 10h/11h CPU core temperature monitor"); MODULE_AUTHOR("Clemens Ladisch <clemens@ladisch.de>"); MODULE_LICENSE("GPL"); static bool force; module_param(force, bool, 0444); MODULE_PARM_DESC(force, "force loading on processors with erratum 319"); /* CPUID function 0x80000001, ebx */ #define CPUID_PKGTYPE_MASK 0xf0000000 #define CPUID_PKGTYPE_F 0x00000000 #define CPUID_PKGTYPE_AM2R2_AM3 0x10000000 /* DRAM controller (PCI function 2) */ #define REG_DCT0_CONFIG_HIGH 0x094 #define DDR3_MODE 0x00000100 /* miscellaneous (PCI function 3) */ #define REG_HARDWARE_THERMAL_CONTROL 0x64 #define HTC_ENABLE 0x00000001 #define REG_REPORTED_TEMPERATURE 0xa4 #define REG_NORTHBRIDGE_CAPABILITIES 0xe8 #define NB_CAP_HTC 0x00000400 static ssize_t show_temp(struct device *dev, struct device_attribute *attr, char *buf) { u32 regval; pci_read_config_dword(to_pci_dev(dev), REG_REPORTED_TEMPERATURE, ®val); return sprintf(buf, "%u\n", (regval >> 21) * 125); } static ssize_t show_temp_max(struct device *dev, struct device_attribute *attr, char *buf) { return sprintf(buf, "%d\n", 70 * 1000); } static ssize_t show_temp_crit(struct device *dev, struct device_attribute *devattr, char *buf) { struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); int show_hyst = attr->index; u32 regval; int value; pci_read_config_dword(to_pci_dev(dev), REG_HARDWARE_THERMAL_CONTROL, ®val); value = ((regval >> 16) & 0x7f) * 500 + 52000; if (show_hyst) value -= ((regval >> 24) & 0xf) * 500; return sprintf(buf, "%d\n", value); } static ssize_t show_name(struct device *dev, struct device_attribute *attr, char *buf) { return sprintf(buf, "k10temp\n"); } static DEVICE_ATTR(temp1_input, S_IRUGO, show_temp, NULL); static DEVICE_ATTR(temp1_max, S_IRUGO, show_temp_max, NULL); static SENSOR_DEVICE_ATTR(temp1_crit, S_IRUGO, show_temp_crit, NULL, 0); static SENSOR_DEVICE_ATTR(temp1_crit_hyst, S_IRUGO, show_temp_crit, NULL, 1); static DEVICE_ATTR(name, S_IRUGO, show_name, NULL); static bool __devinit has_erratum_319(struct pci_dev *pdev) { u32 pkg_type, reg_dram_cfg; if (boot_cpu_data.x86 != 0x10) return false; /* * Erratum 319: The thermal sensor of Socket F/AM2+ processors * may be unreliable. */ pkg_type = cpuid_ebx(0x80000001) & CPUID_PKGTYPE_MASK; if (pkg_type == CPUID_PKGTYPE_F) return true; if (pkg_type != CPUID_PKGTYPE_AM2R2_AM3) return false; /* Differentiate between AM2+ (bad) and AM3 (good) */ pci_bus_read_config_dword(pdev->bus, PCI_DEVFN(PCI_SLOT(pdev->devfn), 2), REG_DCT0_CONFIG_HIGH, ®_dram_cfg); return !(reg_dram_cfg & DDR3_MODE); } static int __devinit k10temp_probe(struct pci_dev *pdev, const struct pci_device_id *id) { struct device *hwmon_dev; u32 reg_caps, reg_htc; int unreliable = has_erratum_319(pdev); int err; if (unreliable && !force) { dev_err(&pdev->dev, "unreliable CPU thermal sensor; monitoring disabled\n"); err = -ENODEV; goto exit; } err = device_create_file(&pdev->dev, &dev_attr_temp1_input); if (err) goto exit; err = device_create_file(&pdev->dev, &dev_attr_temp1_max); if (err) goto exit_remove; pci_read_config_dword(pdev, REG_NORTHBRIDGE_CAPABILITIES, ®_caps); pci_read_config_dword(pdev, REG_HARDWARE_THERMAL_CONTROL, ®_htc); if ((reg_caps & NB_CAP_HTC) && (reg_htc & HTC_ENABLE)) { err = device_create_file(&pdev->dev, &sensor_dev_attr_temp1_crit.dev_attr); if (err) goto exit_remove; err = device_create_file(&pdev->dev, &sensor_dev_attr_temp1_crit_hyst.dev_attr); if (err) goto exit_remove; } err = device_create_file(&pdev->dev, &dev_attr_name); if (err) goto exit_remove; hwmon_dev = hwmon_device_register(&pdev->dev); if (IS_ERR(hwmon_dev)) { err = PTR_ERR(hwmon_dev); goto exit_remove; } dev_set_drvdata(&pdev->dev, hwmon_dev); if (unreliable && force) dev_warn(&pdev->dev, "unreliable CPU thermal sensor; check erratum 319\n"); return 0; exit_remove: device_remove_file(&pdev->dev, &dev_attr_name); device_remove_file(&pdev->dev, &dev_attr_temp1_input); device_remove_file(&pdev->dev, &dev_attr_temp1_max); device_remove_file(&pdev->dev, &sensor_dev_attr_temp1_crit.dev_attr); device_remove_file(&pdev->dev, &sensor_dev_attr_temp1_crit_hyst.dev_attr); exit: return err; } static void __devexit k10temp_remove(struct pci_dev *pdev) { hwmon_device_unregister(dev_get_drvdata(&pdev->dev)); device_remove_file(&pdev->dev, &dev_attr_name); device_remove_file(&pdev->dev, &dev_attr_temp1_input); device_remove_file(&pdev->dev, &dev_attr_temp1_max); device_remove_file(&pdev->dev, &sensor_dev_attr_temp1_crit.dev_attr); device_remove_file(&pdev->dev, &sensor_dev_attr_temp1_crit_hyst.dev_attr); dev_set_drvdata(&pdev->dev, NULL); } static const struct pci_device_id k10temp_id_table[] = { { PCI_VDEVICE(AMD, PCI_DEVICE_ID_AMD_10H_NB_MISC) }, { PCI_VDEVICE(AMD, PCI_DEVICE_ID_AMD_11H_NB_MISC) }, {} }; MODULE_DEVICE_TABLE(pci, k10temp_id_table); static struct pci_driver k10temp_driver = { .name = "k10temp", .id_table = k10temp_id_table, .probe = k10temp_probe, .remove = __devexit_p(k10temp_remove), }; static int __init k10temp_init(void) { return pci_register_driver(&k10temp_driver); } static void __exit k10temp_exit(void) { pci_unregister_driver(&k10temp_driver); } module_init(k10temp_init) module_exit(k10temp_exit)