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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;
Andre Przywara941a9562012-03-23 10:02:17 +010070 curr_pwr_watts = (tdp_limit + data->base_tdp) << running_avg_range;
71 curr_pwr_watts -= running_avg_capture;
Andreas Herrmann512d1022011-05-25 20:43:31 +020072 curr_pwr_watts *= data->tdp_to_watts;
73
74 /*
75 * Convert to microWatt
76 *
77 * power is in Watt provided as fixed point integer with
78 * scaling factor 1/(2^16). For conversion we use
79 * (10^6)/(2^16) = 15625/(2^10)
80 */
Andre Przywara941a9562012-03-23 10:02:17 +010081 curr_pwr_watts = (curr_pwr_watts * 15625) >> (10 + running_avg_range);
Andreas Herrmann512d1022011-05-25 20:43:31 +020082 return sprintf(buf, "%u\n", (unsigned int) curr_pwr_watts);
83}
84static DEVICE_ATTR(power1_input, S_IRUGO, show_power, NULL);
85
86static ssize_t show_power_crit(struct device *dev,
87 struct device_attribute *attr, char *buf)
88{
89 struct fam15h_power_data *data = dev_get_drvdata(dev);
90
91 return sprintf(buf, "%u\n", data->processor_pwr_watts);
92}
93static DEVICE_ATTR(power1_crit, S_IRUGO, show_power_crit, NULL);
94
95static ssize_t show_name(struct device *dev,
96 struct device_attribute *attr, char *buf)
97{
98 return sprintf(buf, "fam15h_power\n");
99}
100static DEVICE_ATTR(name, S_IRUGO, show_name, NULL);
101
102static struct attribute *fam15h_power_attrs[] = {
103 &dev_attr_power1_input.attr,
104 &dev_attr_power1_crit.attr,
105 &dev_attr_name.attr,
106 NULL
107};
108
109static const struct attribute_group fam15h_power_attr_group = {
110 .attrs = fam15h_power_attrs,
111};
112
113static bool __devinit fam15h_power_is_internal_node0(struct pci_dev *f4)
114{
115 u32 val;
116
117 pci_bus_read_config_dword(f4->bus, PCI_DEVFN(PCI_SLOT(f4->devfn), 3),
118 REG_NORTHBRIDGE_CAP, &val);
119 if ((val & BIT(29)) && ((val >> 30) & 3))
120 return false;
121
122 return true;
123}
124
Andre Przywara00250ec2012-04-09 18:16:34 -0400125/*
126 * Newer BKDG versions have an updated recommendation on how to properly
127 * initialize the running average range (was: 0xE, now: 0x9). This avoids
128 * counter saturations resulting in bogus power readings.
129 * We correct this value ourselves to cope with older BIOSes.
130 */
Guenter Roeckc3e40a92012-04-25 13:44:20 -0700131static DEFINE_PCI_DEVICE_TABLE(affected_device) = {
132 { PCI_VDEVICE(AMD, PCI_DEVICE_ID_AMD_15H_NB_F4) },
133 { 0 }
134};
135
Andre Przywara00250ec2012-04-09 18:16:34 -0400136static void __devinit tweak_runavg_range(struct pci_dev *pdev)
137{
138 u32 val;
Andre Przywara00250ec2012-04-09 18:16:34 -0400139
140 /*
141 * let this quirk apply only to the current version of the
142 * northbridge, since future versions may change the behavior
143 */
Guenter Roeckc3e40a92012-04-25 13:44:20 -0700144 if (!pci_match_id(affected_device, pdev))
Andre Przywara00250ec2012-04-09 18:16:34 -0400145 return;
146
147 pci_bus_read_config_dword(pdev->bus,
148 PCI_DEVFN(PCI_SLOT(pdev->devfn), 5),
149 REG_TDP_RUNNING_AVERAGE, &val);
150 if ((val & 0xf) != 0xe)
151 return;
152
153 val &= ~0xf;
154 val |= 0x9;
155 pci_bus_write_config_dword(pdev->bus,
156 PCI_DEVFN(PCI_SLOT(pdev->devfn), 5),
157 REG_TDP_RUNNING_AVERAGE, val);
158}
159
Andreas Herrmann512d1022011-05-25 20:43:31 +0200160static void __devinit fam15h_power_init_data(struct pci_dev *f4,
161 struct fam15h_power_data *data)
162{
163 u32 val;
164 u64 tmp;
165
166 pci_read_config_dword(f4, REG_PROCESSOR_TDP, &val);
167 data->base_tdp = val >> 16;
168 tmp = val & 0xffff;
169
170 pci_bus_read_config_dword(f4->bus, PCI_DEVFN(PCI_SLOT(f4->devfn), 5),
171 REG_TDP_LIMIT3, &val);
172
173 data->tdp_to_watts = ((val & 0x3ff) << 6) | ((val >> 10) & 0x3f);
174 tmp *= data->tdp_to_watts;
175
176 /* result not allowed to be >= 256W */
177 if ((tmp >> 16) >= 256)
178 dev_warn(&f4->dev, "Bogus value for ProcessorPwrWatts "
179 "(processor_pwr_watts>=%u)\n",
180 (unsigned int) (tmp >> 16));
181
182 /* convert to microWatt */
183 data->processor_pwr_watts = (tmp * 15625) >> 10;
184}
185
186static int __devinit fam15h_power_probe(struct pci_dev *pdev,
187 const struct pci_device_id *id)
188{
189 struct fam15h_power_data *data;
190 struct device *dev;
191 int err;
192
Andre Przywara00250ec2012-04-09 18:16:34 -0400193 /*
194 * though we ignore every other northbridge, we still have to
195 * do the tweaking on _each_ node in MCM processors as the counters
196 * are working hand-in-hand
197 */
198 tweak_runavg_range(pdev);
199
Andreas Herrmann512d1022011-05-25 20:43:31 +0200200 if (!fam15h_power_is_internal_node0(pdev)) {
201 err = -ENODEV;
202 goto exit;
203 }
204
205 data = kzalloc(sizeof(struct fam15h_power_data), GFP_KERNEL);
206 if (!data) {
207 err = -ENOMEM;
208 goto exit;
209 }
210 fam15h_power_init_data(pdev, data);
211 dev = &pdev->dev;
212
213 dev_set_drvdata(dev, data);
214 err = sysfs_create_group(&dev->kobj, &fam15h_power_attr_group);
215 if (err)
216 goto exit_free_data;
217
218 data->hwmon_dev = hwmon_device_register(dev);
219 if (IS_ERR(data->hwmon_dev)) {
220 err = PTR_ERR(data->hwmon_dev);
221 goto exit_remove_group;
222 }
223
224 return 0;
225
226exit_remove_group:
227 sysfs_remove_group(&dev->kobj, &fam15h_power_attr_group);
228exit_free_data:
229 kfree(data);
230exit:
231 return err;
232}
233
234static void __devexit fam15h_power_remove(struct pci_dev *pdev)
235{
236 struct device *dev;
237 struct fam15h_power_data *data;
238
239 dev = &pdev->dev;
240 data = dev_get_drvdata(dev);
241 hwmon_device_unregister(data->hwmon_dev);
242 sysfs_remove_group(&dev->kobj, &fam15h_power_attr_group);
243 dev_set_drvdata(dev, NULL);
244 kfree(data);
245}
246
247static DEFINE_PCI_DEVICE_TABLE(fam15h_power_id_table) = {
248 { PCI_VDEVICE(AMD, PCI_DEVICE_ID_AMD_15H_NB_F4) },
249 {}
250};
251MODULE_DEVICE_TABLE(pci, fam15h_power_id_table);
252
253static struct pci_driver fam15h_power_driver = {
254 .name = "fam15h_power",
255 .id_table = fam15h_power_id_table,
256 .probe = fam15h_power_probe,
257 .remove = __devexit_p(fam15h_power_remove),
258};
259
260static int __init fam15h_power_init(void)
261{
262 return pci_register_driver(&fam15h_power_driver);
263}
264
265static void __exit fam15h_power_exit(void)
266{
267 pci_unregister_driver(&fam15h_power_driver);
268}
269
270module_init(fam15h_power_init)
271module_exit(fam15h_power_exit)