272 lines
7.1 KiB
C
272 lines
7.1 KiB
C
/*
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* fam15h_power.c - AMD Family 15h processor power monitoring
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*
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* Copyright (c) 2011 Advanced Micro Devices, Inc.
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* Author: Andreas Herrmann <andreas.herrmann3@amd.com>
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*
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*
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* This driver is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This driver is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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* See the GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this driver; if not, see <http://www.gnu.org/licenses/>.
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*/
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#include <linux/err.h>
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#include <linux/hwmon.h>
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#include <linux/hwmon-sysfs.h>
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#include <linux/init.h>
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#include <linux/module.h>
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#include <linux/pci.h>
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#include <linux/bitops.h>
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#include <asm/processor.h>
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MODULE_DESCRIPTION("AMD Family 15h CPU processor power monitor");
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MODULE_AUTHOR("Andreas Herrmann <andreas.herrmann3@amd.com>");
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MODULE_LICENSE("GPL");
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/* D18F3 */
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#define REG_NORTHBRIDGE_CAP 0xe8
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/* D18F4 */
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#define REG_PROCESSOR_TDP 0x1b8
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/* D18F5 */
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#define REG_TDP_RUNNING_AVERAGE 0xe0
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#define REG_TDP_LIMIT3 0xe8
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struct fam15h_power_data {
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struct device *hwmon_dev;
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unsigned int tdp_to_watts;
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unsigned int base_tdp;
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unsigned int processor_pwr_watts;
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};
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static ssize_t show_power(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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u32 val, tdp_limit, running_avg_range;
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s32 running_avg_capture;
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u64 curr_pwr_watts;
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struct pci_dev *f4 = to_pci_dev(dev);
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struct fam15h_power_data *data = dev_get_drvdata(dev);
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pci_bus_read_config_dword(f4->bus, PCI_DEVFN(PCI_SLOT(f4->devfn), 5),
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REG_TDP_RUNNING_AVERAGE, &val);
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running_avg_capture = (val >> 4) & 0x3fffff;
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running_avg_capture = sign_extend32(running_avg_capture, 21);
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running_avg_range = (val & 0xf) + 1;
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pci_bus_read_config_dword(f4->bus, PCI_DEVFN(PCI_SLOT(f4->devfn), 5),
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REG_TDP_LIMIT3, &val);
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tdp_limit = val >> 16;
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curr_pwr_watts = (tdp_limit + data->base_tdp) << running_avg_range;
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curr_pwr_watts -= running_avg_capture;
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curr_pwr_watts *= data->tdp_to_watts;
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/*
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* Convert to microWatt
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*
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* power is in Watt provided as fixed point integer with
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* scaling factor 1/(2^16). For conversion we use
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* (10^6)/(2^16) = 15625/(2^10)
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*/
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curr_pwr_watts = (curr_pwr_watts * 15625) >> (10 + running_avg_range);
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return sprintf(buf, "%u\n", (unsigned int) curr_pwr_watts);
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}
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static DEVICE_ATTR(power1_input, S_IRUGO, show_power, NULL);
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static ssize_t show_power_crit(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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struct fam15h_power_data *data = dev_get_drvdata(dev);
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return sprintf(buf, "%u\n", data->processor_pwr_watts);
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}
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static DEVICE_ATTR(power1_crit, S_IRUGO, show_power_crit, NULL);
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static ssize_t show_name(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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return sprintf(buf, "fam15h_power\n");
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}
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static DEVICE_ATTR(name, S_IRUGO, show_name, NULL);
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static struct attribute *fam15h_power_attrs[] = {
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&dev_attr_power1_input.attr,
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&dev_attr_power1_crit.attr,
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&dev_attr_name.attr,
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NULL
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};
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static const struct attribute_group fam15h_power_attr_group = {
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.attrs = fam15h_power_attrs,
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};
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static bool __devinit fam15h_power_is_internal_node0(struct pci_dev *f4)
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{
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u32 val;
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pci_bus_read_config_dword(f4->bus, PCI_DEVFN(PCI_SLOT(f4->devfn), 3),
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REG_NORTHBRIDGE_CAP, &val);
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if ((val & BIT(29)) && ((val >> 30) & 3))
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return false;
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return true;
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}
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/*
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* Newer BKDG versions have an updated recommendation on how to properly
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* initialize the running average range (was: 0xE, now: 0x9). This avoids
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* counter saturations resulting in bogus power readings.
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* We correct this value ourselves to cope with older BIOSes.
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*/
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static DEFINE_PCI_DEVICE_TABLE(affected_device) = {
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{ PCI_VDEVICE(AMD, PCI_DEVICE_ID_AMD_15H_NB_F4) },
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{ 0 }
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};
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static void __devinit tweak_runavg_range(struct pci_dev *pdev)
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{
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u32 val;
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/*
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* let this quirk apply only to the current version of the
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* northbridge, since future versions may change the behavior
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*/
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if (!pci_match_id(affected_device, pdev))
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return;
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pci_bus_read_config_dword(pdev->bus,
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PCI_DEVFN(PCI_SLOT(pdev->devfn), 5),
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REG_TDP_RUNNING_AVERAGE, &val);
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if ((val & 0xf) != 0xe)
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return;
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val &= ~0xf;
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val |= 0x9;
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pci_bus_write_config_dword(pdev->bus,
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PCI_DEVFN(PCI_SLOT(pdev->devfn), 5),
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REG_TDP_RUNNING_AVERAGE, val);
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}
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static void __devinit fam15h_power_init_data(struct pci_dev *f4,
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struct fam15h_power_data *data)
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{
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u32 val;
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u64 tmp;
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pci_read_config_dword(f4, REG_PROCESSOR_TDP, &val);
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data->base_tdp = val >> 16;
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tmp = val & 0xffff;
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pci_bus_read_config_dword(f4->bus, PCI_DEVFN(PCI_SLOT(f4->devfn), 5),
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REG_TDP_LIMIT3, &val);
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data->tdp_to_watts = ((val & 0x3ff) << 6) | ((val >> 10) & 0x3f);
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tmp *= data->tdp_to_watts;
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/* result not allowed to be >= 256W */
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if ((tmp >> 16) >= 256)
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dev_warn(&f4->dev, "Bogus value for ProcessorPwrWatts "
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"(processor_pwr_watts>=%u)\n",
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(unsigned int) (tmp >> 16));
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/* convert to microWatt */
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data->processor_pwr_watts = (tmp * 15625) >> 10;
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}
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static int __devinit fam15h_power_probe(struct pci_dev *pdev,
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const struct pci_device_id *id)
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{
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struct fam15h_power_data *data;
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struct device *dev;
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int err;
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/*
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* though we ignore every other northbridge, we still have to
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* do the tweaking on _each_ node in MCM processors as the counters
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* are working hand-in-hand
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*/
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tweak_runavg_range(pdev);
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if (!fam15h_power_is_internal_node0(pdev)) {
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err = -ENODEV;
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goto exit;
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}
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data = kzalloc(sizeof(struct fam15h_power_data), GFP_KERNEL);
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if (!data) {
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err = -ENOMEM;
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goto exit;
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}
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fam15h_power_init_data(pdev, data);
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dev = &pdev->dev;
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dev_set_drvdata(dev, data);
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err = sysfs_create_group(&dev->kobj, &fam15h_power_attr_group);
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if (err)
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goto exit_free_data;
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data->hwmon_dev = hwmon_device_register(dev);
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if (IS_ERR(data->hwmon_dev)) {
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err = PTR_ERR(data->hwmon_dev);
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goto exit_remove_group;
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}
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return 0;
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exit_remove_group:
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sysfs_remove_group(&dev->kobj, &fam15h_power_attr_group);
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exit_free_data:
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kfree(data);
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exit:
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return err;
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}
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static void __devexit fam15h_power_remove(struct pci_dev *pdev)
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{
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struct device *dev;
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struct fam15h_power_data *data;
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dev = &pdev->dev;
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data = dev_get_drvdata(dev);
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hwmon_device_unregister(data->hwmon_dev);
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sysfs_remove_group(&dev->kobj, &fam15h_power_attr_group);
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dev_set_drvdata(dev, NULL);
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kfree(data);
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}
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static DEFINE_PCI_DEVICE_TABLE(fam15h_power_id_table) = {
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{ PCI_VDEVICE(AMD, PCI_DEVICE_ID_AMD_15H_NB_F4) },
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{}
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};
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MODULE_DEVICE_TABLE(pci, fam15h_power_id_table);
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static struct pci_driver fam15h_power_driver = {
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.name = "fam15h_power",
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.id_table = fam15h_power_id_table,
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.probe = fam15h_power_probe,
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.remove = __devexit_p(fam15h_power_remove),
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};
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static int __init fam15h_power_init(void)
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{
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return pci_register_driver(&fam15h_power_driver);
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}
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static void __exit fam15h_power_exit(void)
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{
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pci_unregister_driver(&fam15h_power_driver);
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}
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module_init(fam15h_power_init)
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module_exit(fam15h_power_exit)
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