drivers/hwmon/k10temp.c - kernel/lockdown - Git at Google

 /*
  * k10temp.c - AMD Family 10h/11h/12h/14h/15h/16h 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+ 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, &regval);
 	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, &regval);
 	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 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;

 	/* DDR3 memory implies socket AM3, which is good */
 	pci_bus_read_config_dword(pdev->bus,
 				  PCI_DEVFN(PCI_SLOT(pdev->devfn), 2),
 				  REG_DCT0_CONFIG_HIGH, &reg_dram_cfg);
 	if (reg_dram_cfg & DDR3_MODE)
 		return false;

 	/*
 	 * Unfortunately it is possible to run a socket AM3 CPU with DDR2
 	 * memory. We blacklist all the cores which do exist in socket AM2+
 	 * format. It still isn't perfect, as RB-C2 cores exist in both AM2+
 	 * and AM3 formats, but that's the best we can do.
 	 */
 	return boot_cpu_data.x86_model < 4 ||
 	       (boot_cpu_data.x86_model == 4 && boot_cpu_data.x86_mask <= 2);
 }

 static int 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, &reg_caps);
 	pci_read_config_dword(pdev, REG_HARDWARE_THERMAL_CONTROL, &reg_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;
 	}
 	pci_set_drvdata(pdev, 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 k10temp_remove(struct pci_dev *pdev)
 {
 	hwmon_device_unregister(pci_get_drvdata(pdev));
 	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);
 }

 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) },
 	{ PCI_VDEVICE(AMD, PCI_DEVICE_ID_AMD_CNB17H_F3) },
 	{ PCI_VDEVICE(AMD, PCI_DEVICE_ID_AMD_15H_NB_F3) },
 	{ PCI_VDEVICE(AMD, PCI_DEVICE_ID_AMD_15H_M10H_F3) },
 	{ PCI_VDEVICE(AMD, PCI_DEVICE_ID_AMD_15H_M30H_NB_F3) },
 	{ PCI_VDEVICE(AMD, PCI_DEVICE_ID_AMD_16H_NB_F3) },
 	{}
 };
 MODULE_DEVICE_TABLE(pci, k10temp_id_table);

 static struct pci_driver k10temp_driver = {
 	.name = "k10temp",
 	.id_table = k10temp_id_table,
 	.probe = k10temp_probe,
 	.remove = k10temp_remove,
 };

 module_pci_driver(k10temp_driver);
	/*
	* k10temp.c - AMD Family 10h/11h/12h/14h/15h/16h 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+ 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, &regval);
	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, &regval);
	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 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;

	/* DDR3 memory implies socket AM3, which is good */
	pci_bus_read_config_dword(pdev->bus,
	PCI_DEVFN(PCI_SLOT(pdev->devfn), 2),
	REG_DCT0_CONFIG_HIGH, &reg_dram_cfg);
	if (reg_dram_cfg & DDR3_MODE)
	return false;

	/*
	* Unfortunately it is possible to run a socket AM3 CPU with DDR2
	* memory. We blacklist all the cores which do exist in socket AM2+
	* format. It still isn't perfect, as RB-C2 cores exist in both AM2+
	* and AM3 formats, but that's the best we can do.
	*/
	return boot_cpu_data.x86_model < 4 \|\|
	(boot_cpu_data.x86_model == 4 && boot_cpu_data.x86_mask <= 2);
	}

	static int 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, &reg_caps);
	pci_read_config_dword(pdev, REG_HARDWARE_THERMAL_CONTROL, &reg_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;
	}
	pci_set_drvdata(pdev, 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 k10temp_remove(struct pci_dev *pdev)
	{
	hwmon_device_unregister(pci_get_drvdata(pdev));
	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);
	}

	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) },
	{ PCI_VDEVICE(AMD, PCI_DEVICE_ID_AMD_CNB17H_F3) },
	{ PCI_VDEVICE(AMD, PCI_DEVICE_ID_AMD_15H_NB_F3) },
	{ PCI_VDEVICE(AMD, PCI_DEVICE_ID_AMD_15H_M10H_F3) },
	{ PCI_VDEVICE(AMD, PCI_DEVICE_ID_AMD_15H_M30H_NB_F3) },
	{ PCI_VDEVICE(AMD, PCI_DEVICE_ID_AMD_16H_NB_F3) },
	{}
	};
	MODULE_DEVICE_TABLE(pci, k10temp_id_table);

	static struct pci_driver k10temp_driver = {
	.name = "k10temp",
	.id_table = k10temp_id_table,
	.probe = k10temp_probe,
	.remove = k10temp_remove,
	};

	module_pci_driver(k10temp_driver);