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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.
Andreas Herrmannd034fbf2012-10-29 18:50:47 +01005 * Author: Andreas Herrmann <herrmann.der.user@googlemail.com>
Andreas Herrmann512d1022011-05-25 20:43:31 +02006 *
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");
Andreas Herrmannd034fbf2012-10-29 18:50:47 +010031MODULE_AUTHOR("Andreas Herrmann <herrmann.der.user@googlemail.com>");
Andreas Herrmann512d1022011-05-25 20:43:31 +020032MODULE_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 {
Axel Lin562dc972014-06-19 23:29:11 +080045 struct pci_dev *pdev;
Andreas Herrmann512d1022011-05-25 20:43:31 +020046 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;
Andreas Herrmann512d1022011-05-25 20:43:31 +020057 struct fam15h_power_data *data = dev_get_drvdata(dev);
Axel Lin562dc972014-06-19 23:29:11 +080058 struct pci_dev *f4 = data->pdev;
Andreas Herrmann512d1022011-05-25 20:43:31 +020059
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
Aravind Gopalakrishnan961a2372014-09-16 14:58:04 -050096static umode_t fam15h_power_is_visible(struct kobject *kobj,
97 struct attribute *attr,
98 int index)
99{
100 /* power1_input is only reported for Fam15h, Models 00h-0fh */
101 if (attr == &dev_attr_power1_input.attr &&
102 (boot_cpu_data.x86 != 0x15 || boot_cpu_data.x86_model > 0xf))
103 return 0;
104
105 return attr->mode;
106}
107
Andreas Herrmann512d1022011-05-25 20:43:31 +0200108static struct attribute *fam15h_power_attrs[] = {
109 &dev_attr_power1_input.attr,
110 &dev_attr_power1_crit.attr,
Andreas Herrmann512d1022011-05-25 20:43:31 +0200111 NULL
112};
113
Aravind Gopalakrishnan961a2372014-09-16 14:58:04 -0500114static const struct attribute_group fam15h_power_group = {
115 .attrs = fam15h_power_attrs,
116 .is_visible = fam15h_power_is_visible,
117};
118__ATTRIBUTE_GROUPS(fam15h_power);
Andreas Herrmann512d1022011-05-25 20:43:31 +0200119
Bill Pemberton6c931ae2012-11-19 13:22:35 -0500120static bool fam15h_power_is_internal_node0(struct pci_dev *f4)
Andreas Herrmann512d1022011-05-25 20:43:31 +0200121{
122 u32 val;
123
124 pci_bus_read_config_dword(f4->bus, PCI_DEVFN(PCI_SLOT(f4->devfn), 3),
125 REG_NORTHBRIDGE_CAP, &val);
126 if ((val & BIT(29)) && ((val >> 30) & 3))
127 return false;
128
129 return true;
130}
131
Andre Przywara00250ec2012-04-09 18:16:34 -0400132/*
133 * Newer BKDG versions have an updated recommendation on how to properly
134 * initialize the running average range (was: 0xE, now: 0x9). This avoids
135 * counter saturations resulting in bogus power readings.
136 * We correct this value ourselves to cope with older BIOSes.
137 */
Andreas Herrmann5f0ecb92012-09-23 20:27:32 +0200138static const struct pci_device_id affected_device[] = {
Guenter Roeckc3e40a92012-04-25 13:44:20 -0700139 { PCI_VDEVICE(AMD, PCI_DEVICE_ID_AMD_15H_NB_F4) },
140 { 0 }
141};
142
Andreas Herrmann5f0ecb92012-09-23 20:27:32 +0200143static void tweak_runavg_range(struct pci_dev *pdev)
Andre Przywara00250ec2012-04-09 18:16:34 -0400144{
145 u32 val;
Andre Przywara00250ec2012-04-09 18:16:34 -0400146
147 /*
148 * let this quirk apply only to the current version of the
149 * northbridge, since future versions may change the behavior
150 */
Guenter Roeckc3e40a92012-04-25 13:44:20 -0700151 if (!pci_match_id(affected_device, pdev))
Andre Przywara00250ec2012-04-09 18:16:34 -0400152 return;
153
154 pci_bus_read_config_dword(pdev->bus,
155 PCI_DEVFN(PCI_SLOT(pdev->devfn), 5),
156 REG_TDP_RUNNING_AVERAGE, &val);
157 if ((val & 0xf) != 0xe)
158 return;
159
160 val &= ~0xf;
161 val |= 0x9;
162 pci_bus_write_config_dword(pdev->bus,
163 PCI_DEVFN(PCI_SLOT(pdev->devfn), 5),
164 REG_TDP_RUNNING_AVERAGE, val);
165}
166
Andreas Herrmann5f0ecb92012-09-23 20:27:32 +0200167#ifdef CONFIG_PM
168static int fam15h_power_resume(struct pci_dev *pdev)
169{
170 tweak_runavg_range(pdev);
171 return 0;
172}
173#else
174#define fam15h_power_resume NULL
175#endif
176
Bill Pemberton6c931ae2012-11-19 13:22:35 -0500177static void fam15h_power_init_data(struct pci_dev *f4,
Andreas Herrmann512d1022011-05-25 20:43:31 +0200178 struct fam15h_power_data *data)
179{
180 u32 val;
181 u64 tmp;
182
183 pci_read_config_dword(f4, REG_PROCESSOR_TDP, &val);
184 data->base_tdp = val >> 16;
185 tmp = val & 0xffff;
186
187 pci_bus_read_config_dword(f4->bus, PCI_DEVFN(PCI_SLOT(f4->devfn), 5),
188 REG_TDP_LIMIT3, &val);
189
190 data->tdp_to_watts = ((val & 0x3ff) << 6) | ((val >> 10) & 0x3f);
191 tmp *= data->tdp_to_watts;
192
193 /* result not allowed to be >= 256W */
194 if ((tmp >> 16) >= 256)
Guenter Roeckb55f3752013-01-10 10:01:24 -0800195 dev_warn(&f4->dev,
196 "Bogus value for ProcessorPwrWatts (processor_pwr_watts>=%u)\n",
Andreas Herrmann512d1022011-05-25 20:43:31 +0200197 (unsigned int) (tmp >> 16));
198
199 /* convert to microWatt */
200 data->processor_pwr_watts = (tmp * 15625) >> 10;
201}
202
Bill Pemberton6c931ae2012-11-19 13:22:35 -0500203static int fam15h_power_probe(struct pci_dev *pdev,
Andreas Herrmann512d1022011-05-25 20:43:31 +0200204 const struct pci_device_id *id)
205{
206 struct fam15h_power_data *data;
Guenter Roeck87432a22012-06-02 09:58:06 -0700207 struct device *dev = &pdev->dev;
Axel Lin562dc972014-06-19 23:29:11 +0800208 struct device *hwmon_dev;
Andreas Herrmann512d1022011-05-25 20:43:31 +0200209
Andre Przywara00250ec2012-04-09 18:16:34 -0400210 /*
211 * though we ignore every other northbridge, we still have to
212 * do the tweaking on _each_ node in MCM processors as the counters
213 * are working hand-in-hand
214 */
215 tweak_runavg_range(pdev);
216
Guenter Roeck87432a22012-06-02 09:58:06 -0700217 if (!fam15h_power_is_internal_node0(pdev))
218 return -ENODEV;
Andreas Herrmann512d1022011-05-25 20:43:31 +0200219
Guenter Roeck87432a22012-06-02 09:58:06 -0700220 data = devm_kzalloc(dev, sizeof(struct fam15h_power_data), GFP_KERNEL);
221 if (!data)
222 return -ENOMEM;
223
Andreas Herrmann512d1022011-05-25 20:43:31 +0200224 fam15h_power_init_data(pdev, data);
Axel Lin562dc972014-06-19 23:29:11 +0800225 data->pdev = pdev;
Andreas Herrmann512d1022011-05-25 20:43:31 +0200226
Axel Lin562dc972014-06-19 23:29:11 +0800227 hwmon_dev = devm_hwmon_device_register_with_groups(dev, "fam15h_power",
228 data,
229 fam15h_power_groups);
230 return PTR_ERR_OR_ZERO(hwmon_dev);
Andreas Herrmann512d1022011-05-25 20:43:31 +0200231}
232
Jingoo Hancd9bb052013-12-03 07:10:29 +0000233static const struct pci_device_id fam15h_power_id_table[] = {
Andreas Herrmann512d1022011-05-25 20:43:31 +0200234 { PCI_VDEVICE(AMD, PCI_DEVICE_ID_AMD_15H_NB_F4) },
Boris Ostrovsky22e32f42012-12-05 06:12:42 -0500235 { PCI_VDEVICE(AMD, PCI_DEVICE_ID_AMD_16H_NB_F4) },
Andreas Herrmann512d1022011-05-25 20:43:31 +0200236 {}
237};
238MODULE_DEVICE_TABLE(pci, fam15h_power_id_table);
239
240static struct pci_driver fam15h_power_driver = {
241 .name = "fam15h_power",
242 .id_table = fam15h_power_id_table,
243 .probe = fam15h_power_probe,
Andreas Herrmann5f0ecb92012-09-23 20:27:32 +0200244 .resume = fam15h_power_resume,
Andreas Herrmann512d1022011-05-25 20:43:31 +0200245};
246
Axel Linf71f5a52012-04-02 21:25:46 -0400247module_pci_driver(fam15h_power_driver);