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k10temp.c
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1 /*
2  * k10temp.c - AMD Family 10h/11h/12h/14h/15h processor hardware monitoring
3  *
4  * Copyright (c) 2009 Clemens Ladisch <[email protected]>
5  *
6  *
7  * This driver is free software; you can redistribute it and/or
8  * modify it under the terms of the GNU General Public License; either
9  * version 2 of the License, or (at your option) any later version.
10  *
11  * This driver is distributed in the hope that it will be useful,
12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
14  * See the GNU General Public License for more details.
15  *
16  * You should have received a copy of the GNU General Public License
17  * along with this driver; if not, see <http://www.gnu.org/licenses/>.
18  */
19 
20 #include <linux/err.h>
21 #include <linux/hwmon.h>
22 #include <linux/hwmon-sysfs.h>
23 #include <linux/init.h>
24 #include <linux/module.h>
25 #include <linux/pci.h>
26 #include <asm/processor.h>
27 
28 MODULE_DESCRIPTION("AMD Family 10h+ CPU core temperature monitor");
29 MODULE_AUTHOR("Clemens Ladisch <[email protected]>");
30 MODULE_LICENSE("GPL");
31 
32 static bool force;
33 module_param(force, bool, 0444);
34 MODULE_PARM_DESC(force, "force loading on processors with erratum 319");
35 
36 /* CPUID function 0x80000001, ebx */
37 #define CPUID_PKGTYPE_MASK 0xf0000000
38 #define CPUID_PKGTYPE_F 0x00000000
39 #define CPUID_PKGTYPE_AM2R2_AM3 0x10000000
40 
41 /* DRAM controller (PCI function 2) */
42 #define REG_DCT0_CONFIG_HIGH 0x094
43 #define DDR3_MODE 0x00000100
44 
45 /* miscellaneous (PCI function 3) */
46 #define REG_HARDWARE_THERMAL_CONTROL 0x64
47 #define HTC_ENABLE 0x00000001
48 
49 #define REG_REPORTED_TEMPERATURE 0xa4
50 
51 #define REG_NORTHBRIDGE_CAPABILITIES 0xe8
52 #define NB_CAP_HTC 0x00000400
53 
54 static ssize_t show_temp(struct device *dev,
55  struct device_attribute *attr, char *buf)
56 {
57  u32 regval;
58 
59  pci_read_config_dword(to_pci_dev(dev),
60  REG_REPORTED_TEMPERATURE, &regval);
61  return sprintf(buf, "%u\n", (regval >> 21) * 125);
62 }
63 
64 static ssize_t show_temp_max(struct device *dev,
65  struct device_attribute *attr, char *buf)
66 {
67  return sprintf(buf, "%d\n", 70 * 1000);
68 }
69 
70 static ssize_t show_temp_crit(struct device *dev,
71  struct device_attribute *devattr, char *buf)
72 {
73  struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
74  int show_hyst = attr->index;
75  u32 regval;
76  int value;
77 
78  pci_read_config_dword(to_pci_dev(dev),
79  REG_HARDWARE_THERMAL_CONTROL, &regval);
80  value = ((regval >> 16) & 0x7f) * 500 + 52000;
81  if (show_hyst)
82  value -= ((regval >> 24) & 0xf) * 500;
83  return sprintf(buf, "%d\n", value);
84 }
85 
86 static ssize_t show_name(struct device *dev,
87  struct device_attribute *attr, char *buf)
88 {
89  return sprintf(buf, "k10temp\n");
90 }
91 
92 static DEVICE_ATTR(temp1_input, S_IRUGO, show_temp, NULL);
93 static DEVICE_ATTR(temp1_max, S_IRUGO, show_temp_max, NULL);
94 static SENSOR_DEVICE_ATTR(temp1_crit, S_IRUGO, show_temp_crit, NULL, 0);
95 static SENSOR_DEVICE_ATTR(temp1_crit_hyst, S_IRUGO, show_temp_crit, NULL, 1);
96 static DEVICE_ATTR(name, S_IRUGO, show_name, NULL);
97 
98 static bool __devinit has_erratum_319(struct pci_dev *pdev)
99 {
100  u32 pkg_type, reg_dram_cfg;
101 
102  if (boot_cpu_data.x86 != 0x10)
103  return false;
104 
105  /*
106  * Erratum 319: The thermal sensor of Socket F/AM2+ processors
107  * may be unreliable.
108  */
109  pkg_type = cpuid_ebx(0x80000001) & CPUID_PKGTYPE_MASK;
110  if (pkg_type == CPUID_PKGTYPE_F)
111  return true;
112  if (pkg_type != CPUID_PKGTYPE_AM2R2_AM3)
113  return false;
114 
115  /* DDR3 memory implies socket AM3, which is good */
116  pci_bus_read_config_dword(pdev->bus,
117  PCI_DEVFN(PCI_SLOT(pdev->devfn), 2),
118  REG_DCT0_CONFIG_HIGH, &reg_dram_cfg);
119  if (reg_dram_cfg & DDR3_MODE)
120  return false;
121 
122  /*
123  * Unfortunately it is possible to run a socket AM3 CPU with DDR2
124  * memory. We blacklist all the cores which do exist in socket AM2+
125  * format. It still isn't perfect, as RB-C2 cores exist in both AM2+
126  * and AM3 formats, but that's the best we can do.
127  */
128  return boot_cpu_data.x86_model < 4 ||
129  (boot_cpu_data.x86_model == 4 && boot_cpu_data.x86_mask <= 2);
130 }
131 
132 static int __devinit k10temp_probe(struct pci_dev *pdev,
133  const struct pci_device_id *id)
134 {
135  struct device *hwmon_dev;
136  u32 reg_caps, reg_htc;
137  int unreliable = has_erratum_319(pdev);
138  int err;
139 
140  if (unreliable && !force) {
141  dev_err(&pdev->dev,
142  "unreliable CPU thermal sensor; monitoring disabled\n");
143  err = -ENODEV;
144  goto exit;
145  }
146 
147  err = device_create_file(&pdev->dev, &dev_attr_temp1_input);
148  if (err)
149  goto exit;
150  err = device_create_file(&pdev->dev, &dev_attr_temp1_max);
151  if (err)
152  goto exit_remove;
153 
154  pci_read_config_dword(pdev, REG_NORTHBRIDGE_CAPABILITIES, &reg_caps);
155  pci_read_config_dword(pdev, REG_HARDWARE_THERMAL_CONTROL, &reg_htc);
156  if ((reg_caps & NB_CAP_HTC) && (reg_htc & HTC_ENABLE)) {
157  err = device_create_file(&pdev->dev,
158  &sensor_dev_attr_temp1_crit.dev_attr);
159  if (err)
160  goto exit_remove;
161  err = device_create_file(&pdev->dev,
162  &sensor_dev_attr_temp1_crit_hyst.dev_attr);
163  if (err)
164  goto exit_remove;
165  }
166 
167  err = device_create_file(&pdev->dev, &dev_attr_name);
168  if (err)
169  goto exit_remove;
170 
171  hwmon_dev = hwmon_device_register(&pdev->dev);
172  if (IS_ERR(hwmon_dev)) {
173  err = PTR_ERR(hwmon_dev);
174  goto exit_remove;
175  }
176  pci_set_drvdata(pdev, hwmon_dev);
177 
178  if (unreliable && force)
179  dev_warn(&pdev->dev,
180  "unreliable CPU thermal sensor; check erratum 319\n");
181  return 0;
182 
183 exit_remove:
184  device_remove_file(&pdev->dev, &dev_attr_name);
185  device_remove_file(&pdev->dev, &dev_attr_temp1_input);
186  device_remove_file(&pdev->dev, &dev_attr_temp1_max);
187  device_remove_file(&pdev->dev,
188  &sensor_dev_attr_temp1_crit.dev_attr);
189  device_remove_file(&pdev->dev,
190  &sensor_dev_attr_temp1_crit_hyst.dev_attr);
191 exit:
192  return err;
193 }
194 
195 static void __devexit k10temp_remove(struct pci_dev *pdev)
196 {
197  hwmon_device_unregister(pci_get_drvdata(pdev));
198  device_remove_file(&pdev->dev, &dev_attr_name);
199  device_remove_file(&pdev->dev, &dev_attr_temp1_input);
200  device_remove_file(&pdev->dev, &dev_attr_temp1_max);
201  device_remove_file(&pdev->dev,
202  &sensor_dev_attr_temp1_crit.dev_attr);
203  device_remove_file(&pdev->dev,
204  &sensor_dev_attr_temp1_crit_hyst.dev_attr);
205  pci_set_drvdata(pdev, NULL);
206 }
207 
208 static DEFINE_PCI_DEVICE_TABLE(k10temp_id_table) = {
209  { PCI_VDEVICE(AMD, PCI_DEVICE_ID_AMD_10H_NB_MISC) },
210  { PCI_VDEVICE(AMD, PCI_DEVICE_ID_AMD_11H_NB_MISC) },
211  { PCI_VDEVICE(AMD, PCI_DEVICE_ID_AMD_CNB17H_F3) },
212  { PCI_VDEVICE(AMD, PCI_DEVICE_ID_AMD_15H_NB_F3) },
213  { PCI_VDEVICE(AMD, PCI_DEVICE_ID_AMD_15H_M10H_F3) },
214  {}
215 };
216 MODULE_DEVICE_TABLE(pci, k10temp_id_table);
217 
218 static struct pci_driver k10temp_driver = {
219  .name = "k10temp",
220  .id_table = k10temp_id_table,
221  .probe = k10temp_probe,
222  .remove = __devexit_p(k10temp_remove),
223 };
224 
225 module_pci_driver(k10temp_driver);
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