drivers/hwmon/fam15h_power.c - kernel/common.git - Git at Google

 /*
  * fam15h_power.c - AMD Family 15h processor power monitoring
  *
  * Copyright (c) 2011 Advanced Micro Devices, Inc.
  * Author: Andreas Herrmann <herrmann.der.user@googlemail.com>
  *
  *
  * 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 <linux/bitops.h>
 #include <asm/processor.h>

 MODULE_DESCRIPTION("AMD Family 15h CPU processor power monitor");
 MODULE_AUTHOR("Andreas Herrmann <herrmann.der.user@googlemail.com>");
 MODULE_LICENSE("GPL");

 /* D18F3 */
 #define REG_NORTHBRIDGE_CAP		0xe8

 /* D18F4 */
 #define REG_PROCESSOR_TDP		0x1b8

 /* D18F5 */
 #define REG_TDP_RUNNING_AVERAGE		0xe0
 #define REG_TDP_LIMIT3			0xe8

 struct fam15h_power_data {
 	struct pci_dev *pdev;
 	unsigned int tdp_to_watts;
 	unsigned int base_tdp;
 	unsigned int processor_pwr_watts;
 };

 static ssize_t show_power(struct device *dev,
 			  struct device_attribute *attr, char *buf)
 {
 	u32 val, tdp_limit, running_avg_range;
 	s32 running_avg_capture;
 	u64 curr_pwr_watts;
 	struct fam15h_power_data *data = dev_get_drvdata(dev);
 	struct pci_dev *f4 = data->pdev;

 	pci_bus_read_config_dword(f4->bus, PCI_DEVFN(PCI_SLOT(f4->devfn), 5),
 				  REG_TDP_RUNNING_AVERAGE, &val);
 	running_avg_capture = (val >> 4) & 0x3fffff;
 	running_avg_capture = sign_extend32(running_avg_capture, 21);
 	running_avg_range = (val & 0xf) + 1;

 	pci_bus_read_config_dword(f4->bus, PCI_DEVFN(PCI_SLOT(f4->devfn), 5),
 				  REG_TDP_LIMIT3, &val);

 	tdp_limit = val >> 16;
 	curr_pwr_watts = ((u64)(tdp_limit +
 				data->base_tdp)) << running_avg_range;
 	curr_pwr_watts -= running_avg_capture;
 	curr_pwr_watts *= data->tdp_to_watts;

 	/*
 	 * Convert to microWatt
 	 *
 	 * power is in Watt provided as fixed point integer with
 	 * scaling factor 1/(2^16).  For conversion we use
 	 * (10^6)/(2^16) = 15625/(2^10)
 	 */
 	curr_pwr_watts = (curr_pwr_watts * 15625) >> (10 + running_avg_range);
 	return sprintf(buf, "%u\n", (unsigned int) curr_pwr_watts);
 }
 static DEVICE_ATTR(power1_input, S_IRUGO, show_power, NULL);

 static ssize_t show_power_crit(struct device *dev,
 			       struct device_attribute *attr, char *buf)
 {
 	struct fam15h_power_data *data = dev_get_drvdata(dev);

 	return sprintf(buf, "%u\n", data->processor_pwr_watts);
 }
 static DEVICE_ATTR(power1_crit, S_IRUGO, show_power_crit, NULL);

 static umode_t fam15h_power_is_visible(struct kobject *kobj,
 				       struct attribute *attr,
 				       int index)
 {
 	/* power1_input is only reported for Fam15h, Models 00h-0fh */
 	if (attr == &dev_attr_power1_input.attr &&
 	   (boot_cpu_data.x86 != 0x15 || boot_cpu_data.x86_model > 0xf))
 		return 0;

 	return attr->mode;
 }

 static struct attribute *fam15h_power_attrs[] = {
 	&dev_attr_power1_input.attr,
 	&dev_attr_power1_crit.attr,
 	NULL
 };

 static const struct attribute_group fam15h_power_group = {
 	.attrs = fam15h_power_attrs,
 	.is_visible = fam15h_power_is_visible,
 };
 __ATTRIBUTE_GROUPS(fam15h_power);

 static bool fam15h_power_is_internal_node0(struct pci_dev *f4)
 {
 	u32 val;

 	pci_bus_read_config_dword(f4->bus, PCI_DEVFN(PCI_SLOT(f4->devfn), 3),
 				  REG_NORTHBRIDGE_CAP, &val);
 	if ((val & BIT(29)) && ((val >> 30) & 3))
 		return false;

 	return true;
 }

 /*
  * Newer BKDG versions have an updated recommendation on how to properly
  * initialize the running average range (was: 0xE, now: 0x9). This avoids
  * counter saturations resulting in bogus power readings.
  * We correct this value ourselves to cope with older BIOSes.
  */
 static const struct pci_device_id affected_device[] = {
 	{ PCI_VDEVICE(AMD, PCI_DEVICE_ID_AMD_15H_NB_F4) },
 	{ 0 }
 };

 static void tweak_runavg_range(struct pci_dev *pdev)
 {
 	u32 val;

 	/*
 	 * let this quirk apply only to the current version of the
 	 * northbridge, since future versions may change the behavior
 	 */
 	if (!pci_match_id(affected_device, pdev))
 		return;

 	pci_bus_read_config_dword(pdev->bus,
 		PCI_DEVFN(PCI_SLOT(pdev->devfn), 5),
 		REG_TDP_RUNNING_AVERAGE, &val);
 	if ((val & 0xf) != 0xe)
 		return;

 	val &= ~0xf;
 	val |=  0x9;
 	pci_bus_write_config_dword(pdev->bus,
 		PCI_DEVFN(PCI_SLOT(pdev->devfn), 5),
 		REG_TDP_RUNNING_AVERAGE, val);
 }

 #ifdef CONFIG_PM
 static int fam15h_power_resume(struct pci_dev *pdev)
 {
 	tweak_runavg_range(pdev);
 	return 0;
 }
 #else
 #define fam15h_power_resume NULL
 #endif

 static void fam15h_power_init_data(struct pci_dev *f4,
 					     struct fam15h_power_data *data)
 {
 	u32 val;
 	u64 tmp;

 	pci_read_config_dword(f4, REG_PROCESSOR_TDP, &val);
 	data->base_tdp = val >> 16;
 	tmp = val & 0xffff;

 	pci_bus_read_config_dword(f4->bus, PCI_DEVFN(PCI_SLOT(f4->devfn), 5),
 				  REG_TDP_LIMIT3, &val);

 	data->tdp_to_watts = ((val & 0x3ff) << 6) | ((val >> 10) & 0x3f);
 	tmp *= data->tdp_to_watts;

 	/* result not allowed to be >= 256W */
 	if ((tmp >> 16) >= 256)
 		dev_warn(&f4->dev,
 			 "Bogus value for ProcessorPwrWatts (processor_pwr_watts>=%u)\n",
 			 (unsigned int) (tmp >> 16));

 	/* convert to microWatt */
 	data->processor_pwr_watts = (tmp * 15625) >> 10;
 }

 static int fam15h_power_probe(struct pci_dev *pdev,
 					const struct pci_device_id *id)
 {
 	struct fam15h_power_data *data;
 	struct device *dev = &pdev->dev;
 	struct device *hwmon_dev;

 	/*
 	 * though we ignore every other northbridge, we still have to
 	 * do the tweaking on _each_ node in MCM processors as the counters
 	 * are working hand-in-hand
 	 */
 	tweak_runavg_range(pdev);

 	if (!fam15h_power_is_internal_node0(pdev))
 		return -ENODEV;

 	data = devm_kzalloc(dev, sizeof(struct fam15h_power_data), GFP_KERNEL);
 	if (!data)
 		return -ENOMEM;

 	fam15h_power_init_data(pdev, data);
 	data->pdev = pdev;

 	hwmon_dev = devm_hwmon_device_register_with_groups(dev, "fam15h_power",
 							   data,
 							   fam15h_power_groups);
 	return PTR_ERR_OR_ZERO(hwmon_dev);
 }

 static const struct pci_device_id fam15h_power_id_table[] = {
 	{ PCI_VDEVICE(AMD, PCI_DEVICE_ID_AMD_15H_NB_F4) },
 	{ PCI_VDEVICE(AMD, PCI_DEVICE_ID_AMD_15H_M30H_NB_F4) },
 	{ PCI_VDEVICE(AMD, PCI_DEVICE_ID_AMD_16H_NB_F4) },
 	{ PCI_VDEVICE(AMD, PCI_DEVICE_ID_AMD_16H_M30H_NB_F4) },
 	{}
 };
 MODULE_DEVICE_TABLE(pci, fam15h_power_id_table);

 static struct pci_driver fam15h_power_driver = {
 	.name = "fam15h_power",
 	.id_table = fam15h_power_id_table,
 	.probe = fam15h_power_probe,
 	.resume = fam15h_power_resume,
 };

 module_pci_driver(fam15h_power_driver);
	/*
	* fam15h_power.c - AMD Family 15h processor power monitoring
	*
	* Copyright (c) 2011 Advanced Micro Devices, Inc.
	* Author: Andreas Herrmann <herrmann.der.user@googlemail.com>
	*
	*
	* 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 <linux/bitops.h>
	#include <asm/processor.h>

	MODULE_DESCRIPTION("AMD Family 15h CPU processor power monitor");
	MODULE_AUTHOR("Andreas Herrmann <herrmann.der.user@googlemail.com>");
	MODULE_LICENSE("GPL");

	/* D18F3 */
	#define REG_NORTHBRIDGE_CAP 0xe8

	/* D18F4 */
	#define REG_PROCESSOR_TDP 0x1b8

	/* D18F5 */
	#define REG_TDP_RUNNING_AVERAGE 0xe0
	#define REG_TDP_LIMIT3 0xe8

	struct fam15h_power_data {
	struct pci_dev *pdev;
	unsigned int tdp_to_watts;
	unsigned int base_tdp;
	unsigned int processor_pwr_watts;
	};

	static ssize_t show_power(struct device *dev,
	struct device_attribute attr, char buf)
	{
	u32 val, tdp_limit, running_avg_range;
	s32 running_avg_capture;
	u64 curr_pwr_watts;
	struct fam15h_power_data *data = dev_get_drvdata(dev);
	struct pci_dev *f4 = data->pdev;

	pci_bus_read_config_dword(f4->bus, PCI_DEVFN(PCI_SLOT(f4->devfn), 5),
	REG_TDP_RUNNING_AVERAGE, &val);
	running_avg_capture = (val >> 4) & 0x3fffff;
	running_avg_capture = sign_extend32(running_avg_capture, 21);
	running_avg_range = (val & 0xf) + 1;

	pci_bus_read_config_dword(f4->bus, PCI_DEVFN(PCI_SLOT(f4->devfn), 5),
	REG_TDP_LIMIT3, &val);

	tdp_limit = val >> 16;
	curr_pwr_watts = ((u64)(tdp_limit +
	data->base_tdp)) << running_avg_range;
	curr_pwr_watts -= running_avg_capture;
	curr_pwr_watts *= data->tdp_to_watts;

	/*
	* Convert to microWatt
	*
	* power is in Watt provided as fixed point integer with
	* scaling factor 1/(2^16). For conversion we use
	* (10^6)/(2^16) = 15625/(2^10)
	*/
	curr_pwr_watts = (curr_pwr_watts * 15625) >> (10 + running_avg_range);
	return sprintf(buf, "%u\n", (unsigned int) curr_pwr_watts);
	}
	static DEVICE_ATTR(power1_input, S_IRUGO, show_power, NULL);

	static ssize_t show_power_crit(struct device *dev,
	struct device_attribute attr, char buf)
	{
	struct fam15h_power_data *data = dev_get_drvdata(dev);

	return sprintf(buf, "%u\n", data->processor_pwr_watts);
	}
	static DEVICE_ATTR(power1_crit, S_IRUGO, show_power_crit, NULL);

	static umode_t fam15h_power_is_visible(struct kobject *kobj,
	struct attribute *attr,
	int index)
	{
	/* power1_input is only reported for Fam15h, Models 00h-0fh */
	if (attr == &dev_attr_power1_input.attr &&
	(boot_cpu_data.x86 != 0x15 \|\| boot_cpu_data.x86_model > 0xf))
	return 0;

	return attr->mode;
	}

	static struct attribute *fam15h_power_attrs[] = {
	&dev_attr_power1_input.attr,
	&dev_attr_power1_crit.attr,
	NULL
	};

	static const struct attribute_group fam15h_power_group = {
	.attrs = fam15h_power_attrs,
	.is_visible = fam15h_power_is_visible,
	};
	__ATTRIBUTE_GROUPS(fam15h_power);

	static bool fam15h_power_is_internal_node0(struct pci_dev *f4)
	{
	u32 val;

	pci_bus_read_config_dword(f4->bus, PCI_DEVFN(PCI_SLOT(f4->devfn), 3),
	REG_NORTHBRIDGE_CAP, &val);
	if ((val & BIT(29)) && ((val >> 30) & 3))
	return false;

	return true;
	}

	/*
	* Newer BKDG versions have an updated recommendation on how to properly
	* initialize the running average range (was: 0xE, now: 0x9). This avoids
	* counter saturations resulting in bogus power readings.
	* We correct this value ourselves to cope with older BIOSes.
	*/
	static const struct pci_device_id affected_device[] = {
	{ PCI_VDEVICE(AMD, PCI_DEVICE_ID_AMD_15H_NB_F4) },
	{ 0 }
	};

	static void tweak_runavg_range(struct pci_dev *pdev)
	{
	u32 val;

	/*
	* let this quirk apply only to the current version of the
	* northbridge, since future versions may change the behavior
	*/
	if (!pci_match_id(affected_device, pdev))
	return;

	pci_bus_read_config_dword(pdev->bus,
	PCI_DEVFN(PCI_SLOT(pdev->devfn), 5),
	REG_TDP_RUNNING_AVERAGE, &val);
	if ((val & 0xf) != 0xe)
	return;

	val &= ~0xf;
	val \|= 0x9;
	pci_bus_write_config_dword(pdev->bus,
	PCI_DEVFN(PCI_SLOT(pdev->devfn), 5),
	REG_TDP_RUNNING_AVERAGE, val);
	}

	#ifdef CONFIG_PM
	static int fam15h_power_resume(struct pci_dev *pdev)
	{
	tweak_runavg_range(pdev);
	return 0;
	}
	#else
	#define fam15h_power_resume NULL
	#endif

	static void fam15h_power_init_data(struct pci_dev *f4,
	struct fam15h_power_data *data)
	{
	u32 val;
	u64 tmp;

	pci_read_config_dword(f4, REG_PROCESSOR_TDP, &val);
	data->base_tdp = val >> 16;
	tmp = val & 0xffff;

	pci_bus_read_config_dword(f4->bus, PCI_DEVFN(PCI_SLOT(f4->devfn), 5),
	REG_TDP_LIMIT3, &val);

	data->tdp_to_watts = ((val & 0x3ff) << 6) \| ((val >> 10) & 0x3f);
	tmp *= data->tdp_to_watts;

	/* result not allowed to be >= 256W */
	if ((tmp >> 16) >= 256)
	dev_warn(&f4->dev,
	"Bogus value for ProcessorPwrWatts (processor_pwr_watts>=%u)\n",
	(unsigned int) (tmp >> 16));

	/* convert to microWatt */
	data->processor_pwr_watts = (tmp * 15625) >> 10;
	}

	static int fam15h_power_probe(struct pci_dev *pdev,
	const struct pci_device_id *id)
	{
	struct fam15h_power_data *data;
	struct device *dev = &pdev->dev;
	struct device *hwmon_dev;

	/*
	* though we ignore every other northbridge, we still have to
	* do the tweaking on _each_ node in MCM processors as the counters
	* are working hand-in-hand
	*/
	tweak_runavg_range(pdev);

	if (!fam15h_power_is_internal_node0(pdev))
	return -ENODEV;

	data = devm_kzalloc(dev, sizeof(struct fam15h_power_data), GFP_KERNEL);
	if (!data)
	return -ENOMEM;

	fam15h_power_init_data(pdev, data);
	data->pdev = pdev;

	hwmon_dev = devm_hwmon_device_register_with_groups(dev, "fam15h_power",
	data,
	fam15h_power_groups);
	return PTR_ERR_OR_ZERO(hwmon_dev);
	}

	static const struct pci_device_id fam15h_power_id_table[] = {
	{ PCI_VDEVICE(AMD, PCI_DEVICE_ID_AMD_15H_NB_F4) },
	{ PCI_VDEVICE(AMD, PCI_DEVICE_ID_AMD_15H_M30H_NB_F4) },
	{ PCI_VDEVICE(AMD, PCI_DEVICE_ID_AMD_16H_NB_F4) },
	{ PCI_VDEVICE(AMD, PCI_DEVICE_ID_AMD_16H_M30H_NB_F4) },
	{}
	};
	MODULE_DEVICE_TABLE(pci, fam15h_power_id_table);

	static struct pci_driver fam15h_power_driver = {
	.name = "fam15h_power",
	.id_table = fam15h_power_id_table,
	.probe = fam15h_power_probe,
	.resume = fam15h_power_resume,
	};

	module_pci_driver(fam15h_power_driver);