mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-28 11:49:32 +00:00
![Aravind Gopalakrishnan](/assets/img/avatar_default.png)
PCI_DEVICE_ID_AMD_16H_NB_F4 can be obtained from it's definition in pci_ids.h. So we don't have to define it again here. Signed-off-by: Aravind Gopalakrishnan <Aravind.Gopalakrishnan@amd.com> Signed-off-by: Guenter Roeck <linux@roeck-us.net>
231 lines
6.2 KiB
C
231 lines
6.2 KiB
C
/*
|
|
* 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 struct attribute *fam15h_power_attrs[] = {
|
|
&dev_attr_power1_input.attr,
|
|
&dev_attr_power1_crit.attr,
|
|
NULL
|
|
};
|
|
|
|
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_16H_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);
|