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Subject[PATCH v2] hwmon: Add driver for AMD family 15h processor power information
From: Andreas Herrmann <andreas.herrmann3@amd.com>

This CPU family provides NB register values to gather following
TDP information

* ProcessorPwrWatts: Specifies in Watts the maximum amount of power
the processor can support.
* CurrPwrWatts: Specifies in Watts the current amount of power being
consumed by the processor.

This driver provides

* power1_cap (ProcessorPwrWatts)
* power1_input (CurrPwrWatts)

Changes from v1::
- removed deprecated code line,
- fixed comment,
- report power only once per socket (Power information is provided
for the entire package. On multi-node processors it should only be
reported on internal node 0.)

Signed-off-by: Andreas Herrmann <andreas.herrmann3@amd.com>
---
drivers/hwmon/Kconfig | 10 ++
drivers/hwmon/Makefile | 1 +
drivers/hwmon/f15h_power.c | 216 ++++++++++++++++++++++++++++++++++++++++++++
3 files changed, 227 insertions(+), 0 deletions(-)
create mode 100644 drivers/hwmon/f15h_power.c
diff --git a/drivers/hwmon/Kconfig b/drivers/hwmon/Kconfig
index 8e84b31..0268623 100644
--- a/drivers/hwmon/Kconfig
+++ b/drivers/hwmon/Kconfig
@@ -249,6 +249,16 @@ config SENSORS_K10TEMP
This driver can also be built as a module. If so, the module
will be called k10temp.

+config SENSORS_F15H_POWER
+ tristate "AMD Family 15h processor power"
+ depends on X86 && PCI
+ help
+ If you say yes here you get support for processor power
+ information of your AMD family 15h CPU.
+
+ This driver can also be built as a module. If so, the module
+ will be called f15hpower.
+
config SENSORS_ASB100
tristate "Asus ASB100 Bach"
depends on X86 && I2C && EXPERIMENTAL
diff --git a/drivers/hwmon/Makefile b/drivers/hwmon/Makefile
index dde02d9..e554b88 100644
--- a/drivers/hwmon/Makefile
+++ b/drivers/hwmon/Makefile
@@ -62,6 +62,7 @@ obj-$(CONFIG_SENSORS_JC42) += jc42.o
obj-$(CONFIG_SENSORS_JZ4740) += jz4740-hwmon.o
obj-$(CONFIG_SENSORS_K8TEMP) += k8temp.o
obj-$(CONFIG_SENSORS_K10TEMP) += k10temp.o
+obj-$(CONFIG_SENSORS_F15H_POWER) += f15h_power.o
obj-$(CONFIG_SENSORS_LIS3LV02D) += lis3lv02d.o hp_accel.o
obj-$(CONFIG_SENSORS_LIS3_SPI) += lis3lv02d.o lis3lv02d_spi.o
obj-$(CONFIG_SENSORS_LIS3_I2C) += lis3lv02d.o lis3lv02d_i2c.o
diff --git a/drivers/hwmon/f15h_power.c b/drivers/hwmon/f15h_power.c
new file mode 100644
index 0000000..40e3cbd
--- /dev/null
+++ b/drivers/hwmon/f15h_power.c
@@ -0,0 +1,216 @@
+/*
+ * f15h_power.c - AMD Family 15h processor power monitoring
+ *
+ * Copyright (c) 2011 Advanced Micro Devices, Inc.
+ * Author: Andreas Herrmann <andreas.herrmann3@amd.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 <andreas.herrmann3@amd.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
+
+static ssize_t show_power(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ u32 val, btdp, tdpl, tdp2w, arange;
+ s32 acap;
+ u64 ctdp;
+ struct pci_dev *f4 = to_pci_dev(dev);
+ struct pci_dev *f5;
+
+ pci_read_config_dword(f4, REG_PROCESSOR_TDP, &val);
+ btdp = (val >> 16) & 0xffff;
+
+ f5 = pci_get_slot(f4->bus, PCI_DEVFN(PCI_SLOT(f4->devfn), 5));
+ if (!f5) {
+ dev_err(dev, "no function 5 available on this slot\n");
+ return 0;
+ }
+
+ pci_read_config_dword(f5, REG_TDP_RUNNING_AVERAGE, &val);
+ acap = (val >> 4) & 0x3fffff;
+ acap = sign_extend32(acap, 22);
+ arange = val & 0xf;
+
+ pci_read_config_dword(f5, REG_TDP_LIMIT3, &val);
+ pci_dev_put(f5);
+
+ tdpl = (val >> 16) & 0x1fff;
+ tdp2w = ((val & 0x3ff) << 6) | ((val >> 10) & 0x3f);
+ ctdp = tdpl - (s32)(acap >> (arange + 1)) + btdp;
+ ctdp *= tdp2w;
+
+ /*
+ * 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)
+ */
+ ctdp = (ctdp * 15625) >> 10;
+ return sprintf(buf, "%d\n", (u32) ctdp);
+}
+static DEVICE_ATTR(power1_input, S_IRUGO, show_power, NULL);
+
+static ssize_t show_power_cap(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ u32 val, tdp2w;
+ u64 ptdp;
+ struct pci_dev *f4 = to_pci_dev(dev);
+ struct pci_dev *f5;
+
+ pci_read_config_dword(f4, REG_PROCESSOR_TDP, &val);
+ ptdp = val & 0xffff;
+
+ f5 = pci_get_slot(f4->bus, PCI_DEVFN(PCI_SLOT(f4->devfn), 5));
+ if (!f5) {
+ dev_err(dev, "no function 5 available on this slot\n");
+ return 0;
+ }
+
+ pci_read_config_dword(f5, REG_TDP_LIMIT3, &val);
+ pci_dev_put(f5);
+
+ tdp2w = ((val & 0x3ff) << 6) | ((val >> 10) & 0x3f);
+ ptdp *= tdp2w;
+
+ /* result not allowed to be >= 256W */
+ WARN_ON(ptdp>>16 >= 256);
+
+ /* convert to microWatt */
+ ptdp = (ptdp * 15625) >> 10;
+ return sprintf(buf, "%d\n", (u32) ptdp);
+}
+static DEVICE_ATTR(power1_cap, S_IRUGO, show_power_cap, NULL);
+
+static ssize_t show_name(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ return sprintf(buf, "f15h_power\n");
+}
+static DEVICE_ATTR(name, S_IRUGO, show_name, NULL);
+
+static int __devinit f15h_power_is_internal_node0(struct pci_dev *f4)
+{
+ u32 val;
+ struct pci_dev *f3;
+
+ f3 = pci_get_slot(f4->bus, PCI_DEVFN(PCI_SLOT(f4->devfn), 3));
+ if (!f3) {
+ dev_err(&f4->dev, "no function 3 available on this slot\n");
+ return 0;
+ }
+
+ pci_read_config_dword(f3, REG_NORTHBRIDGE_CAP, &val);
+ pci_dev_put(f3);
+
+ if ((val & BIT(29)) && ((val >> 30) & 3))
+ return 0;
+
+ return 1;
+}
+
+static int __devinit f15h_power_probe(struct pci_dev *pdev,
+ const struct pci_device_id *id)
+{
+ struct device *hwmon_dev;
+ int err = -ENODEV;
+
+ if (!f15h_power_is_internal_node0(pdev))
+ goto exit;
+
+ err = device_create_file(&pdev->dev, &dev_attr_power1_input);
+ if (err)
+ goto exit;
+ err = device_create_file(&pdev->dev, &dev_attr_power1_cap);
+ 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;
+ }
+ dev_set_drvdata(&pdev->dev, hwmon_dev);
+
+ return 0;
+
+exit_remove:
+ device_remove_file(&pdev->dev, &dev_attr_name);
+ device_remove_file(&pdev->dev, &dev_attr_power1_input);
+ device_remove_file(&pdev->dev, &dev_attr_power1_cap);
+exit:
+ return err;
+}
+
+static void __devexit f15h_power_remove(struct pci_dev *pdev)
+{
+ hwmon_device_unregister(dev_get_drvdata(&pdev->dev));
+ device_remove_file(&pdev->dev, &dev_attr_name);
+ device_remove_file(&pdev->dev, &dev_attr_power1_input);
+ device_remove_file(&pdev->dev, &dev_attr_power1_cap);
+ dev_set_drvdata(&pdev->dev, NULL);
+}
+
+static const struct pci_device_id f15h_power_id_table[] = {
+ { PCI_VDEVICE(AMD, PCI_DEVICE_ID_AMD_15H_NB_LINK) },
+ {}
+};
+MODULE_DEVICE_TABLE(pci, f15h_power_id_table);
+
+static struct pci_driver f15h_power_driver = {
+ .name = "f15h_power",
+ .id_table = f15h_power_id_table,
+ .probe = f15h_power_probe,
+ .remove = __devexit_p(f15h_power_remove),
+};
+
+static int __init f15h_power_init(void)
+{
+ return pci_register_driver(&f15h_power_driver);
+}
+
+static void __exit f15h_power_exit(void)
+{
+ pci_unregister_driver(&f15h_power_driver);
+}
+
+module_init(f15h_power_init)
+module_exit(f15h_power_exit)
--
1.7.3.1


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