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Andreas Herrmann512d1022011-05-25 20:43:31 +02001/*
2 * fam15h_power.c - AMD Family 15h processor power monitoring
3 *
4 * Copyright (c) 2011 Advanced Micro Devices, Inc.
5 * Author: Andreas Herrmann <andreas.herrmann3@amd.com>
6 *
7 *
8 * This driver is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU General Public License; either
10 * version 2 of the License, or (at your option) any later version.
11 *
12 * This driver is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
15 * See the GNU General Public License for more details.
16 *
17 * You should have received a copy of the GNU General Public License
18 * along with this driver; if not, see <http://www.gnu.org/licenses/>.
19 */
20
21#include <linux/err.h>
22#include <linux/hwmon.h>
23#include <linux/hwmon-sysfs.h>
24#include <linux/init.h>
25#include <linux/module.h>
26#include <linux/pci.h>
27#include <linux/bitops.h>
28#include <asm/processor.h>
29
30MODULE_DESCRIPTION("AMD Family 15h CPU processor power monitor");
31MODULE_AUTHOR("Andreas Herrmann <andreas.herrmann3@amd.com>");
32MODULE_LICENSE("GPL");
33
34/* D18F3 */
35#define REG_NORTHBRIDGE_CAP 0xe8
36
37/* D18F4 */
38#define REG_PROCESSOR_TDP 0x1b8
39
40/* D18F5 */
41#define REG_TDP_RUNNING_AVERAGE 0xe0
42#define REG_TDP_LIMIT3 0xe8
43
44struct fam15h_power_data {
45 struct device *hwmon_dev;
46 unsigned int tdp_to_watts;
47 unsigned int base_tdp;
48 unsigned int processor_pwr_watts;
49};
50
51static ssize_t show_power(struct device *dev,
52 struct device_attribute *attr, char *buf)
53{
54 u32 val, tdp_limit, running_avg_range;
55 s32 running_avg_capture;
56 u64 curr_pwr_watts;
57 struct pci_dev *f4 = to_pci_dev(dev);
58 struct fam15h_power_data *data = dev_get_drvdata(dev);
59
60 pci_bus_read_config_dword(f4->bus, PCI_DEVFN(PCI_SLOT(f4->devfn), 5),
61 REG_TDP_RUNNING_AVERAGE, &val);
62 running_avg_capture = (val >> 4) & 0x3fffff;
Andreas Herrmannfc0900c2012-03-23 10:02:17 +010063 running_avg_capture = sign_extend32(running_avg_capture, 21);
Andre Przywara941a9562012-03-23 10:02:17 +010064 running_avg_range = (val & 0xf) + 1;
Andreas Herrmann512d1022011-05-25 20:43:31 +020065
66 pci_bus_read_config_dword(f4->bus, PCI_DEVFN(PCI_SLOT(f4->devfn), 5),
67 REG_TDP_LIMIT3, &val);
68
69 tdp_limit = val >> 16;
Guenter Roeck62867d42012-06-21 06:26:12 -070070 curr_pwr_watts = ((u64)(tdp_limit +
71 data->base_tdp)) << running_avg_range;
Andre Przywara941a9562012-03-23 10:02:17 +010072 curr_pwr_watts -= running_avg_capture;
Andreas Herrmann512d1022011-05-25 20:43:31 +020073 curr_pwr_watts *= data->tdp_to_watts;
74
75 /*
76 * Convert to microWatt
77 *
78 * power is in Watt provided as fixed point integer with
79 * scaling factor 1/(2^16). For conversion we use
80 * (10^6)/(2^16) = 15625/(2^10)
81 */
Andre Przywara941a9562012-03-23 10:02:17 +010082 curr_pwr_watts = (curr_pwr_watts * 15625) >> (10 + running_avg_range);
Andreas Herrmann512d1022011-05-25 20:43:31 +020083 return sprintf(buf, "%u\n", (unsigned int) curr_pwr_watts);
84}
85static DEVICE_ATTR(power1_input, S_IRUGO, show_power, NULL);
86
87static ssize_t show_power_crit(struct device *dev,
88 struct device_attribute *attr, char *buf)
89{
90 struct fam15h_power_data *data = dev_get_drvdata(dev);
91
92 return sprintf(buf, "%u\n", data->processor_pwr_watts);
93}
94static DEVICE_ATTR(power1_crit, S_IRUGO, show_power_crit, NULL);
95
96static ssize_t show_name(struct device *dev,
97 struct device_attribute *attr, char *buf)
98{
99 return sprintf(buf, "fam15h_power\n");
100}
101static DEVICE_ATTR(name, S_IRUGO, show_name, NULL);
102
103static struct attribute *fam15h_power_attrs[] = {
104 &dev_attr_power1_input.attr,
105 &dev_attr_power1_crit.attr,
106 &dev_attr_name.attr,
107 NULL
108};
109
110static const struct attribute_group fam15h_power_attr_group = {
111 .attrs = fam15h_power_attrs,
112};
113
114static bool __devinit fam15h_power_is_internal_node0(struct pci_dev *f4)
115{
116 u32 val;
117
118 pci_bus_read_config_dword(f4->bus, PCI_DEVFN(PCI_SLOT(f4->devfn), 3),
119 REG_NORTHBRIDGE_CAP, &val);
120 if ((val & BIT(29)) && ((val >> 30) & 3))
121 return false;
122
123 return true;
124}
125
Andre Przywara00250ec2012-04-09 18:16:34 -0400126/*
127 * Newer BKDG versions have an updated recommendation on how to properly
128 * initialize the running average range (was: 0xE, now: 0x9). This avoids
129 * counter saturations resulting in bogus power readings.
130 * We correct this value ourselves to cope with older BIOSes.
131 */
Andreas Herrmann5f0ecb92012-09-23 20:27:32 +0200132static const struct pci_device_id affected_device[] = {
Guenter Roeckc3e40a92012-04-25 13:44:20 -0700133 { PCI_VDEVICE(AMD, PCI_DEVICE_ID_AMD_15H_NB_F4) },
134 { 0 }
135};
136
Andreas Herrmann5f0ecb92012-09-23 20:27:32 +0200137static void tweak_runavg_range(struct pci_dev *pdev)
Andre Przywara00250ec2012-04-09 18:16:34 -0400138{
139 u32 val;
Andre Przywara00250ec2012-04-09 18:16:34 -0400140
141 /*
142 * let this quirk apply only to the current version of the
143 * northbridge, since future versions may change the behavior
144 */
Guenter Roeckc3e40a92012-04-25 13:44:20 -0700145 if (!pci_match_id(affected_device, pdev))
Andre Przywara00250ec2012-04-09 18:16:34 -0400146 return;
147
148 pci_bus_read_config_dword(pdev->bus,
149 PCI_DEVFN(PCI_SLOT(pdev->devfn), 5),
150 REG_TDP_RUNNING_AVERAGE, &val);
151 if ((val & 0xf) != 0xe)
152 return;
153
154 val &= ~0xf;
155 val |= 0x9;
156 pci_bus_write_config_dword(pdev->bus,
157 PCI_DEVFN(PCI_SLOT(pdev->devfn), 5),
158 REG_TDP_RUNNING_AVERAGE, val);
159}
160
Andreas Herrmann5f0ecb92012-09-23 20:27:32 +0200161#ifdef CONFIG_PM
162static int fam15h_power_resume(struct pci_dev *pdev)
163{
164 tweak_runavg_range(pdev);
165 return 0;
166}
167#else
168#define fam15h_power_resume NULL
169#endif
170
Andreas Herrmann512d1022011-05-25 20:43:31 +0200171static void __devinit fam15h_power_init_data(struct pci_dev *f4,
172 struct fam15h_power_data *data)
173{
174 u32 val;
175 u64 tmp;
176
177 pci_read_config_dword(f4, REG_PROCESSOR_TDP, &val);
178 data->base_tdp = val >> 16;
179 tmp = val & 0xffff;
180
181 pci_bus_read_config_dword(f4->bus, PCI_DEVFN(PCI_SLOT(f4->devfn), 5),
182 REG_TDP_LIMIT3, &val);
183
184 data->tdp_to_watts = ((val & 0x3ff) << 6) | ((val >> 10) & 0x3f);
185 tmp *= data->tdp_to_watts;
186
187 /* result not allowed to be >= 256W */
188 if ((tmp >> 16) >= 256)
189 dev_warn(&f4->dev, "Bogus value for ProcessorPwrWatts "
190 "(processor_pwr_watts>=%u)\n",
191 (unsigned int) (tmp >> 16));
192
193 /* convert to microWatt */
194 data->processor_pwr_watts = (tmp * 15625) >> 10;
195}
196
197static int __devinit fam15h_power_probe(struct pci_dev *pdev,
198 const struct pci_device_id *id)
199{
200 struct fam15h_power_data *data;
Guenter Roeck87432a22012-06-02 09:58:06 -0700201 struct device *dev = &pdev->dev;
Andreas Herrmann512d1022011-05-25 20:43:31 +0200202 int err;
203
Andre Przywara00250ec2012-04-09 18:16:34 -0400204 /*
205 * though we ignore every other northbridge, we still have to
206 * do the tweaking on _each_ node in MCM processors as the counters
207 * are working hand-in-hand
208 */
209 tweak_runavg_range(pdev);
210
Guenter Roeck87432a22012-06-02 09:58:06 -0700211 if (!fam15h_power_is_internal_node0(pdev))
212 return -ENODEV;
Andreas Herrmann512d1022011-05-25 20:43:31 +0200213
Guenter Roeck87432a22012-06-02 09:58:06 -0700214 data = devm_kzalloc(dev, sizeof(struct fam15h_power_data), GFP_KERNEL);
215 if (!data)
216 return -ENOMEM;
217
Andreas Herrmann512d1022011-05-25 20:43:31 +0200218 fam15h_power_init_data(pdev, data);
Andreas Herrmann512d1022011-05-25 20:43:31 +0200219
220 dev_set_drvdata(dev, data);
221 err = sysfs_create_group(&dev->kobj, &fam15h_power_attr_group);
222 if (err)
Guenter Roeck87432a22012-06-02 09:58:06 -0700223 return err;
Andreas Herrmann512d1022011-05-25 20:43:31 +0200224
225 data->hwmon_dev = hwmon_device_register(dev);
226 if (IS_ERR(data->hwmon_dev)) {
227 err = PTR_ERR(data->hwmon_dev);
228 goto exit_remove_group;
229 }
230
231 return 0;
232
233exit_remove_group:
234 sysfs_remove_group(&dev->kobj, &fam15h_power_attr_group);
Andreas Herrmann512d1022011-05-25 20:43:31 +0200235 return err;
236}
237
238static void __devexit fam15h_power_remove(struct pci_dev *pdev)
239{
240 struct device *dev;
241 struct fam15h_power_data *data;
242
243 dev = &pdev->dev;
244 data = dev_get_drvdata(dev);
245 hwmon_device_unregister(data->hwmon_dev);
246 sysfs_remove_group(&dev->kobj, &fam15h_power_attr_group);
Andreas Herrmann512d1022011-05-25 20:43:31 +0200247}
248
249static DEFINE_PCI_DEVICE_TABLE(fam15h_power_id_table) = {
250 { PCI_VDEVICE(AMD, PCI_DEVICE_ID_AMD_15H_NB_F4) },
251 {}
252};
253MODULE_DEVICE_TABLE(pci, fam15h_power_id_table);
254
255static struct pci_driver fam15h_power_driver = {
256 .name = "fam15h_power",
257 .id_table = fam15h_power_id_table,
258 .probe = fam15h_power_probe,
259 .remove = __devexit_p(fam15h_power_remove),
Andreas Herrmann5f0ecb92012-09-23 20:27:32 +0200260 .resume = fam15h_power_resume,
Andreas Herrmann512d1022011-05-25 20:43:31 +0200261};
262
Axel Linf71f5a52012-04-02 21:25:46 -0400263module_pci_driver(fam15h_power_driver);