drivers/hwmon/k10temp.c - kernel/bruno - 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");

 /* Provide lock for writing to NB_SMU_IND_ADDR */
 static DEFINE_MUTEX(nb_smu_ind_mutex);

 /* 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

 /*
  * For F15h M60h, functionality of REG_REPORTED_TEMPERATURE
  * has been moved to D0F0xBC_xD820_0CA4 [Reported Temperature
  * Control]
  */
 #define F15H_M60H_REPORTED_TEMP_CTRL_OFFSET	0xd8200ca4

 static void amd_nb_smu_index_read(struct pci_dev *pdev, unsigned int devfn,
 				  int offset, u32 *val)
 {
 	mutex_lock(&nb_smu_ind_mutex);
 	pci_bus_write_config_dword(pdev->bus, devfn,
 				   0xb8, offset);
 	pci_bus_read_config_dword(pdev->bus, devfn,
 				  0xbc, val);
 	mutex_unlock(&nb_smu_ind_mutex);
 }

 static ssize_t show_temp(struct device *dev,
 			 struct device_attribute *attr, char *buf)
 {
 	u32 regval;
 	struct pci_dev *pdev = dev_get_drvdata(dev);

 	if (boot_cpu_data.x86 == 0x15 && boot_cpu_data.x86_model == 0x60) {
 		amd_nb_smu_index_read(pdev, PCI_DEVFN(0, 0),
 				      F15H_M60H_REPORTED_TEMP_CTRL_OFFSET,
 				      &regval);
 	} else {
 		pci_read_config_dword(pdev, 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(dev_get_drvdata(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 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 umode_t k10temp_is_visible(struct kobject *kobj,
 				  struct attribute *attr, int index)
 {
 	struct device *dev = container_of(kobj, struct device, kobj);
 	struct pci_dev *pdev = dev_get_drvdata(dev);

 	if (index >= 2) {
 		u32 reg_caps, reg_htc;

 		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))
 			return 0;
 	}
 	return attr->mode;
 }

 static struct attribute *k10temp_attrs[] = {
 	&dev_attr_temp1_input.attr,
 	&dev_attr_temp1_max.attr,
 	&sensor_dev_attr_temp1_crit.dev_attr.attr,
 	&sensor_dev_attr_temp1_crit_hyst.dev_attr.attr,
 	NULL
 };

 static const struct attribute_group k10temp_group = {
 	.attrs = k10temp_attrs,
 	.is_visible = k10temp_is_visible,
 };
 __ATTRIBUTE_GROUPS(k10temp);

 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)
 {
 	int unreliable = has_erratum_319(pdev);
 	struct device *dev = &pdev->dev;
 	struct device *hwmon_dev;

 	if (unreliable) {
 		if (!force) {
 			dev_err(dev,
 				"unreliable CPU thermal sensor; monitoring disabled\n");
 			return -ENODEV;
 		}
 		dev_warn(dev,
 			 "unreliable CPU thermal sensor; check erratum 319\n");
 	}

 	hwmon_dev = devm_hwmon_device_register_with_groups(dev, "k10temp", pdev,
 							   k10temp_groups);
 	return PTR_ERR_OR_ZERO(hwmon_dev);
 }

 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_15H_M60H_NB_F3) },
 	{ PCI_VDEVICE(AMD, PCI_DEVICE_ID_AMD_16H_NB_F3) },
 	{ PCI_VDEVICE(AMD, PCI_DEVICE_ID_AMD_16H_M30H_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,
 };

 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");

	/* Provide lock for writing to NB_SMU_IND_ADDR */
	static DEFINE_MUTEX(nb_smu_ind_mutex);

	/* 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

	/*
	* For F15h M60h, functionality of REG_REPORTED_TEMPERATURE
	* has been moved to D0F0xBC_xD820_0CA4 [Reported Temperature
	* Control]
	*/
	#define F15H_M60H_REPORTED_TEMP_CTRL_OFFSET 0xd8200ca4

	static void amd_nb_smu_index_read(struct pci_dev *pdev, unsigned int devfn,
	int offset, u32 *val)
	{
	mutex_lock(&nb_smu_ind_mutex);
	pci_bus_write_config_dword(pdev->bus, devfn,
	0xb8, offset);
	pci_bus_read_config_dword(pdev->bus, devfn,
	0xbc, val);
	mutex_unlock(&nb_smu_ind_mutex);
	}

	static ssize_t show_temp(struct device *dev,
	struct device_attribute attr, char buf)
	{
	u32 regval;
	struct pci_dev *pdev = dev_get_drvdata(dev);

	if (boot_cpu_data.x86 == 0x15 && boot_cpu_data.x86_model == 0x60) {
	amd_nb_smu_index_read(pdev, PCI_DEVFN(0, 0),
	F15H_M60H_REPORTED_TEMP_CTRL_OFFSET,
	&regval);
	} else {
	pci_read_config_dword(pdev, 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(dev_get_drvdata(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 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 umode_t k10temp_is_visible(struct kobject *kobj,
	struct attribute *attr, int index)
	{
	struct device *dev = container_of(kobj, struct device, kobj);
	struct pci_dev *pdev = dev_get_drvdata(dev);

	if (index >= 2) {
	u32 reg_caps, reg_htc;

	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))
	return 0;
	}
	return attr->mode;
	}

	static struct attribute *k10temp_attrs[] = {
	&dev_attr_temp1_input.attr,
	&dev_attr_temp1_max.attr,
	&sensor_dev_attr_temp1_crit.dev_attr.attr,
	&sensor_dev_attr_temp1_crit_hyst.dev_attr.attr,
	NULL
	};

	static const struct attribute_group k10temp_group = {
	.attrs = k10temp_attrs,
	.is_visible = k10temp_is_visible,
	};
	__ATTRIBUTE_GROUPS(k10temp);

	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)
	{
	int unreliable = has_erratum_319(pdev);
	struct device *dev = &pdev->dev;
	struct device *hwmon_dev;

	if (unreliable) {
	if (!force) {
	dev_err(dev,
	"unreliable CPU thermal sensor; monitoring disabled\n");
	return -ENODEV;
	}
	dev_warn(dev,
	"unreliable CPU thermal sensor; check erratum 319\n");
	}

	hwmon_dev = devm_hwmon_device_register_with_groups(dev, "k10temp", pdev,
	k10temp_groups);
	return PTR_ERR_OR_ZERO(hwmon_dev);
	}

	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_15H_M60H_NB_F3) },
	{ PCI_VDEVICE(AMD, PCI_DEVICE_ID_AMD_16H_NB_F3) },
	{ PCI_VDEVICE(AMD, PCI_DEVICE_ID_AMD_16H_M30H_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,
	};

	module_pci_driver(k10temp_driver);