diff options
author | Andreas Herrmann <andreas.herrmann3@amd.com> | 2011-05-25 14:43:31 -0400 |
---|---|---|
committer | Jean Delvare <khali@endymion.delvare> | 2011-05-25 14:43:31 -0400 |
commit | 512d1027a6c58def3c2a410e8be65b7e730aad3b (patch) | |
tree | a83a92937cb27a135f56610b299dbcac5fbcaa2f /drivers/hwmon/fam15h_power.c | |
parent | 9e5813111265ad3c37a4370f0ee7e634dc07a7d6 (diff) |
hwmon: Add driver for AMD family 15h processor power information
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_crit (ProcessorPwrWatts)
* power1_input (CurrPwrWatts)
Signed-off-by: Andreas Herrmann <andreas.herrmann3@amd.com>
Signed-off-by: Jean Delvare <khali@linux-fr.org>
Diffstat (limited to 'drivers/hwmon/fam15h_power.c')
-rw-r--r-- | drivers/hwmon/fam15h_power.c | 229 |
1 files changed, 229 insertions, 0 deletions
diff --git a/drivers/hwmon/fam15h_power.c b/drivers/hwmon/fam15h_power.c new file mode 100644 index 000000000000..523f8fb9e7d9 --- /dev/null +++ b/drivers/hwmon/fam15h_power.c | |||
@@ -0,0 +1,229 @@ | |||
1 | /* | ||
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 | |||
30 | MODULE_DESCRIPTION("AMD Family 15h CPU processor power monitor"); | ||
31 | MODULE_AUTHOR("Andreas Herrmann <andreas.herrmann3@amd.com>"); | ||
32 | MODULE_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 | |||
44 | struct 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 | |||
51 | static 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; | ||
63 | running_avg_capture = sign_extend32(running_avg_capture, 22); | ||
64 | running_avg_range = val & 0xf; | ||
65 | |||
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; | ||
70 | curr_pwr_watts = tdp_limit + data->base_tdp - | ||
71 | (s32)(running_avg_capture >> (running_avg_range + 1)); | ||
72 | 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 | */ | ||
81 | curr_pwr_watts = (curr_pwr_watts * 15625) >> 10; | ||
82 | return sprintf(buf, "%u\n", (unsigned int) curr_pwr_watts); | ||
83 | } | ||
84 | static DEVICE_ATTR(power1_input, S_IRUGO, show_power, NULL); | ||
85 | |||
86 | static 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 | } | ||
93 | static DEVICE_ATTR(power1_crit, S_IRUGO, show_power_crit, NULL); | ||
94 | |||
95 | static ssize_t show_name(struct device *dev, | ||
96 | struct device_attribute *attr, char *buf) | ||
97 | { | ||
98 | return sprintf(buf, "fam15h_power\n"); | ||
99 | } | ||
100 | static DEVICE_ATTR(name, S_IRUGO, show_name, NULL); | ||
101 | |||
102 | static 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 | |||
109 | static const struct attribute_group fam15h_power_attr_group = { | ||
110 | .attrs = fam15h_power_attrs, | ||
111 | }; | ||
112 | |||
113 | static 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 | |||
125 | static void __devinit fam15h_power_init_data(struct pci_dev *f4, | ||
126 | struct fam15h_power_data *data) | ||
127 | { | ||
128 | u32 val; | ||
129 | u64 tmp; | ||
130 | |||
131 | pci_read_config_dword(f4, REG_PROCESSOR_TDP, &val); | ||
132 | data->base_tdp = val >> 16; | ||
133 | tmp = val & 0xffff; | ||
134 | |||
135 | pci_bus_read_config_dword(f4->bus, PCI_DEVFN(PCI_SLOT(f4->devfn), 5), | ||
136 | REG_TDP_LIMIT3, &val); | ||
137 | |||
138 | data->tdp_to_watts = ((val & 0x3ff) << 6) | ((val >> 10) & 0x3f); | ||
139 | tmp *= data->tdp_to_watts; | ||
140 | |||
141 | /* result not allowed to be >= 256W */ | ||
142 | if ((tmp >> 16) >= 256) | ||
143 | dev_warn(&f4->dev, "Bogus value for ProcessorPwrWatts " | ||
144 | "(processor_pwr_watts>=%u)\n", | ||
145 | (unsigned int) (tmp >> 16)); | ||
146 | |||
147 | /* convert to microWatt */ | ||
148 | data->processor_pwr_watts = (tmp * 15625) >> 10; | ||
149 | } | ||
150 | |||
151 | static int __devinit fam15h_power_probe(struct pci_dev *pdev, | ||
152 | const struct pci_device_id *id) | ||
153 | { | ||
154 | struct fam15h_power_data *data; | ||
155 | struct device *dev; | ||
156 | int err; | ||
157 | |||
158 | if (!fam15h_power_is_internal_node0(pdev)) { | ||
159 | err = -ENODEV; | ||
160 | goto exit; | ||
161 | } | ||
162 | |||
163 | data = kzalloc(sizeof(struct fam15h_power_data), GFP_KERNEL); | ||
164 | if (!data) { | ||
165 | err = -ENOMEM; | ||
166 | goto exit; | ||
167 | } | ||
168 | fam15h_power_init_data(pdev, data); | ||
169 | dev = &pdev->dev; | ||
170 | |||
171 | dev_set_drvdata(dev, data); | ||
172 | err = sysfs_create_group(&dev->kobj, &fam15h_power_attr_group); | ||
173 | if (err) | ||
174 | goto exit_free_data; | ||
175 | |||
176 | data->hwmon_dev = hwmon_device_register(dev); | ||
177 | if (IS_ERR(data->hwmon_dev)) { | ||
178 | err = PTR_ERR(data->hwmon_dev); | ||
179 | goto exit_remove_group; | ||
180 | } | ||
181 | |||
182 | return 0; | ||
183 | |||
184 | exit_remove_group: | ||
185 | sysfs_remove_group(&dev->kobj, &fam15h_power_attr_group); | ||
186 | exit_free_data: | ||
187 | kfree(data); | ||
188 | exit: | ||
189 | return err; | ||
190 | } | ||
191 | |||
192 | static void __devexit fam15h_power_remove(struct pci_dev *pdev) | ||
193 | { | ||
194 | struct device *dev; | ||
195 | struct fam15h_power_data *data; | ||
196 | |||
197 | dev = &pdev->dev; | ||
198 | data = dev_get_drvdata(dev); | ||
199 | hwmon_device_unregister(data->hwmon_dev); | ||
200 | sysfs_remove_group(&dev->kobj, &fam15h_power_attr_group); | ||
201 | dev_set_drvdata(dev, NULL); | ||
202 | kfree(data); | ||
203 | } | ||
204 | |||
205 | static DEFINE_PCI_DEVICE_TABLE(fam15h_power_id_table) = { | ||
206 | { PCI_VDEVICE(AMD, PCI_DEVICE_ID_AMD_15H_NB_F4) }, | ||
207 | {} | ||
208 | }; | ||
209 | MODULE_DEVICE_TABLE(pci, fam15h_power_id_table); | ||
210 | |||
211 | static struct pci_driver fam15h_power_driver = { | ||
212 | .name = "fam15h_power", | ||
213 | .id_table = fam15h_power_id_table, | ||
214 | .probe = fam15h_power_probe, | ||
215 | .remove = __devexit_p(fam15h_power_remove), | ||
216 | }; | ||
217 | |||
218 | static int __init fam15h_power_init(void) | ||
219 | { | ||
220 | return pci_register_driver(&fam15h_power_driver); | ||
221 | } | ||
222 | |||
223 | static void __exit fam15h_power_exit(void) | ||
224 | { | ||
225 | pci_unregister_driver(&fam15h_power_driver); | ||
226 | } | ||
227 | |||
228 | module_init(fam15h_power_init) | ||
229 | module_exit(fam15h_power_exit) | ||