Commit | Line | Data |
---|---|---|
cb84b194 FY |
1 | /* |
2 | * pkgtemp.c - Linux kernel module for processor package hardware monitoring | |
3 | * | |
4 | * Copyright (C) 2010 Fenghua Yu <fenghua.yu@intel.com> | |
5 | * | |
6 | * Inspired from many hwmon drivers especially coretemp. | |
7 | * | |
8 | * This program is free software; you can redistribute it and/or modify | |
9 | * it under the terms of the GNU General Public License as published by | |
10 | * the Free Software Foundation; version 2 of the License. | |
11 | * | |
12 | * This program 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. See the | |
15 | * 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 program; if not, write to the Free Software | |
19 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA | |
20 | * 02110-1301 USA. | |
21 | */ | |
22 | ||
14a613cc JP |
23 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
24 | ||
cb84b194 | 25 | #include <linux/module.h> |
cb84b194 FY |
26 | #include <linux/init.h> |
27 | #include <linux/slab.h> | |
28 | #include <linux/jiffies.h> | |
29 | #include <linux/hwmon.h> | |
30 | #include <linux/sysfs.h> | |
31 | #include <linux/hwmon-sysfs.h> | |
32 | #include <linux/err.h> | |
33 | #include <linux/mutex.h> | |
34 | #include <linux/list.h> | |
35 | #include <linux/platform_device.h> | |
36 | #include <linux/cpu.h> | |
cb84b194 FY |
37 | #include <asm/msr.h> |
38 | #include <asm/processor.h> | |
fd53d084 | 39 | #include <asm/smp.h> |
cb84b194 FY |
40 | |
41 | #define DRVNAME "pkgtemp" | |
42 | ||
43 | enum { SHOW_TEMP, SHOW_TJMAX, SHOW_TTARGET, SHOW_LABEL, SHOW_NAME }; | |
44 | ||
45 | /* | |
46 | * Functions declaration | |
47 | */ | |
48 | ||
49 | static struct pkgtemp_data *pkgtemp_update_device(struct device *dev); | |
50 | ||
51 | struct pkgtemp_data { | |
52 | struct device *hwmon_dev; | |
53 | struct mutex update_lock; | |
54 | const char *name; | |
55 | u32 id; | |
56 | u16 phys_proc_id; | |
57 | char valid; /* zero until following fields are valid */ | |
58 | unsigned long last_updated; /* in jiffies */ | |
59 | int temp; | |
60 | int tjmax; | |
61 | int ttarget; | |
62 | u8 alarm; | |
63 | }; | |
64 | ||
65 | /* | |
66 | * Sysfs stuff | |
67 | */ | |
68 | ||
69 | static ssize_t show_name(struct device *dev, struct device_attribute | |
70 | *devattr, char *buf) | |
71 | { | |
72 | int ret; | |
73 | struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); | |
74 | struct pkgtemp_data *data = dev_get_drvdata(dev); | |
75 | ||
76 | if (attr->index == SHOW_NAME) | |
77 | ret = sprintf(buf, "%s\n", data->name); | |
78 | else /* show label */ | |
79 | ret = sprintf(buf, "physical id %d\n", | |
80 | data->phys_proc_id); | |
81 | return ret; | |
82 | } | |
83 | ||
84 | static ssize_t show_alarm(struct device *dev, struct device_attribute | |
85 | *devattr, char *buf) | |
86 | { | |
87 | struct pkgtemp_data *data = pkgtemp_update_device(dev); | |
88 | /* read the Out-of-spec log, never clear */ | |
89 | return sprintf(buf, "%d\n", data->alarm); | |
90 | } | |
91 | ||
92 | static ssize_t show_temp(struct device *dev, | |
93 | struct device_attribute *devattr, char *buf) | |
94 | { | |
95 | struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); | |
96 | struct pkgtemp_data *data = pkgtemp_update_device(dev); | |
97 | int err = 0; | |
98 | ||
99 | if (attr->index == SHOW_TEMP) | |
100 | err = data->valid ? sprintf(buf, "%d\n", data->temp) : -EAGAIN; | |
101 | else if (attr->index == SHOW_TJMAX) | |
102 | err = sprintf(buf, "%d\n", data->tjmax); | |
103 | else | |
104 | err = sprintf(buf, "%d\n", data->ttarget); | |
105 | return err; | |
106 | } | |
107 | ||
108 | static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, show_temp, NULL, SHOW_TEMP); | |
109 | static SENSOR_DEVICE_ATTR(temp1_crit, S_IRUGO, show_temp, NULL, SHOW_TJMAX); | |
110 | static SENSOR_DEVICE_ATTR(temp1_max, S_IRUGO, show_temp, NULL, SHOW_TTARGET); | |
111 | static DEVICE_ATTR(temp1_crit_alarm, S_IRUGO, show_alarm, NULL); | |
112 | static SENSOR_DEVICE_ATTR(temp1_label, S_IRUGO, show_name, NULL, SHOW_LABEL); | |
113 | static SENSOR_DEVICE_ATTR(name, S_IRUGO, show_name, NULL, SHOW_NAME); | |
114 | ||
115 | static struct attribute *pkgtemp_attributes[] = { | |
116 | &sensor_dev_attr_name.dev_attr.attr, | |
117 | &sensor_dev_attr_temp1_label.dev_attr.attr, | |
118 | &dev_attr_temp1_crit_alarm.attr, | |
119 | &sensor_dev_attr_temp1_input.dev_attr.attr, | |
120 | &sensor_dev_attr_temp1_crit.dev_attr.attr, | |
121 | NULL | |
122 | }; | |
123 | ||
124 | static const struct attribute_group pkgtemp_group = { | |
125 | .attrs = pkgtemp_attributes, | |
126 | }; | |
127 | ||
128 | static struct pkgtemp_data *pkgtemp_update_device(struct device *dev) | |
129 | { | |
130 | struct pkgtemp_data *data = dev_get_drvdata(dev); | |
131 | unsigned int cpu; | |
132 | int err; | |
133 | ||
134 | mutex_lock(&data->update_lock); | |
135 | ||
136 | if (!data->valid || time_after(jiffies, data->last_updated + HZ)) { | |
137 | u32 eax, edx; | |
138 | ||
139 | data->valid = 0; | |
140 | cpu = data->id; | |
141 | err = rdmsr_on_cpu(cpu, MSR_IA32_PACKAGE_THERM_STATUS, | |
142 | &eax, &edx); | |
143 | if (!err) { | |
144 | data->alarm = (eax >> 5) & 1; | |
145 | data->temp = data->tjmax - (((eax >> 16) | |
146 | & 0x7f) * 1000); | |
147 | data->valid = 1; | |
148 | } else | |
149 | dev_dbg(dev, "Temperature data invalid (0x%x)\n", eax); | |
150 | ||
151 | data->last_updated = jiffies; | |
152 | } | |
153 | ||
154 | mutex_unlock(&data->update_lock); | |
155 | return data; | |
156 | } | |
157 | ||
158 | static int get_tjmax(int cpu, struct device *dev) | |
159 | { | |
160 | int default_tjmax = 100000; | |
161 | int err; | |
162 | u32 eax, edx; | |
163 | u32 val; | |
164 | ||
165 | /* IA32_TEMPERATURE_TARGET contains the TjMax value */ | |
166 | err = rdmsr_safe_on_cpu(cpu, MSR_IA32_TEMPERATURE_TARGET, &eax, &edx); | |
167 | if (!err) { | |
168 | val = (eax >> 16) & 0xff; | |
169 | if ((val > 80) && (val < 120)) { | |
170 | dev_info(dev, "TjMax is %d C.\n", val); | |
171 | return val * 1000; | |
172 | } | |
173 | } | |
174 | dev_warn(dev, "Unable to read TjMax from CPU.\n"); | |
175 | return default_tjmax; | |
176 | } | |
177 | ||
178 | static int __devinit pkgtemp_probe(struct platform_device *pdev) | |
179 | { | |
180 | struct pkgtemp_data *data; | |
181 | int err; | |
182 | u32 eax, edx; | |
183 | #ifdef CONFIG_SMP | |
184 | struct cpuinfo_x86 *c = &cpu_data(pdev->id); | |
185 | #endif | |
186 | ||
187 | data = kzalloc(sizeof(struct pkgtemp_data), GFP_KERNEL); | |
188 | if (!data) { | |
189 | err = -ENOMEM; | |
190 | dev_err(&pdev->dev, "Out of memory\n"); | |
191 | goto exit; | |
192 | } | |
193 | ||
194 | data->id = pdev->id; | |
195 | #ifdef CONFIG_SMP | |
196 | data->phys_proc_id = c->phys_proc_id; | |
197 | #endif | |
198 | data->name = "pkgtemp"; | |
199 | mutex_init(&data->update_lock); | |
200 | ||
201 | /* test if we can access the THERM_STATUS MSR */ | |
202 | err = rdmsr_safe_on_cpu(data->id, MSR_IA32_PACKAGE_THERM_STATUS, | |
203 | &eax, &edx); | |
204 | if (err) { | |
205 | dev_err(&pdev->dev, | |
206 | "Unable to access THERM_STATUS MSR, giving up\n"); | |
207 | goto exit_free; | |
208 | } | |
209 | ||
210 | data->tjmax = get_tjmax(data->id, &pdev->dev); | |
211 | platform_set_drvdata(pdev, data); | |
212 | ||
213 | err = rdmsr_safe_on_cpu(data->id, MSR_IA32_TEMPERATURE_TARGET, | |
214 | &eax, &edx); | |
215 | if (err) { | |
216 | dev_warn(&pdev->dev, "Unable to read" | |
217 | " IA32_TEMPERATURE_TARGET MSR\n"); | |
218 | } else { | |
219 | data->ttarget = data->tjmax - (((eax >> 8) & 0xff) * 1000); | |
220 | err = device_create_file(&pdev->dev, | |
221 | &sensor_dev_attr_temp1_max.dev_attr); | |
222 | if (err) | |
223 | goto exit_free; | |
224 | } | |
225 | ||
226 | err = sysfs_create_group(&pdev->dev.kobj, &pkgtemp_group); | |
227 | if (err) | |
d172132f | 228 | goto exit_dev; |
cb84b194 FY |
229 | |
230 | data->hwmon_dev = hwmon_device_register(&pdev->dev); | |
231 | if (IS_ERR(data->hwmon_dev)) { | |
232 | err = PTR_ERR(data->hwmon_dev); | |
233 | dev_err(&pdev->dev, "Class registration failed (%d)\n", | |
234 | err); | |
235 | goto exit_class; | |
236 | } | |
237 | ||
238 | return 0; | |
239 | ||
240 | exit_class: | |
241 | sysfs_remove_group(&pdev->dev.kobj, &pkgtemp_group); | |
d172132f JB |
242 | exit_dev: |
243 | device_remove_file(&pdev->dev, &sensor_dev_attr_temp1_max.dev_attr); | |
cb84b194 FY |
244 | exit_free: |
245 | kfree(data); | |
246 | exit: | |
247 | return err; | |
248 | } | |
249 | ||
250 | static int __devexit pkgtemp_remove(struct platform_device *pdev) | |
251 | { | |
252 | struct pkgtemp_data *data = platform_get_drvdata(pdev); | |
253 | ||
254 | hwmon_device_unregister(data->hwmon_dev); | |
255 | sysfs_remove_group(&pdev->dev.kobj, &pkgtemp_group); | |
d172132f | 256 | device_remove_file(&pdev->dev, &sensor_dev_attr_temp1_max.dev_attr); |
cb84b194 FY |
257 | platform_set_drvdata(pdev, NULL); |
258 | kfree(data); | |
259 | return 0; | |
260 | } | |
261 | ||
262 | static struct platform_driver pkgtemp_driver = { | |
263 | .driver = { | |
264 | .owner = THIS_MODULE, | |
265 | .name = DRVNAME, | |
266 | }, | |
267 | .probe = pkgtemp_probe, | |
268 | .remove = __devexit_p(pkgtemp_remove), | |
269 | }; | |
270 | ||
271 | struct pdev_entry { | |
272 | struct list_head list; | |
273 | struct platform_device *pdev; | |
274 | unsigned int cpu; | |
275 | #ifdef CONFIG_SMP | |
276 | u16 phys_proc_id; | |
277 | #endif | |
278 | }; | |
279 | ||
280 | static LIST_HEAD(pdev_list); | |
281 | static DEFINE_MUTEX(pdev_list_mutex); | |
282 | ||
283 | static int __cpuinit pkgtemp_device_add(unsigned int cpu) | |
284 | { | |
285 | int err; | |
286 | struct platform_device *pdev; | |
287 | struct pdev_entry *pdev_entry; | |
cb84b194 | 288 | struct cpuinfo_x86 *c = &cpu_data(cpu); |
f6aeccdb JB |
289 | |
290 | if (!cpu_has(c, X86_FEATURE_PTS)) | |
291 | return 0; | |
cb84b194 FY |
292 | |
293 | mutex_lock(&pdev_list_mutex); | |
294 | ||
295 | #ifdef CONFIG_SMP | |
296 | /* Only keep the first entry in each package */ | |
297 | list_for_each_entry(pdev_entry, &pdev_list, list) { | |
298 | if (c->phys_proc_id == pdev_entry->phys_proc_id) { | |
299 | err = 0; /* Not an error */ | |
300 | goto exit; | |
301 | } | |
302 | } | |
303 | #endif | |
304 | ||
305 | pdev = platform_device_alloc(DRVNAME, cpu); | |
306 | if (!pdev) { | |
307 | err = -ENOMEM; | |
14a613cc | 308 | pr_err("Device allocation failed\n"); |
cb84b194 FY |
309 | goto exit; |
310 | } | |
311 | ||
312 | pdev_entry = kzalloc(sizeof(struct pdev_entry), GFP_KERNEL); | |
313 | if (!pdev_entry) { | |
314 | err = -ENOMEM; | |
315 | goto exit_device_put; | |
316 | } | |
317 | ||
318 | err = platform_device_add(pdev); | |
319 | if (err) { | |
14a613cc | 320 | pr_err("Device addition failed (%d)\n", err); |
cb84b194 FY |
321 | goto exit_device_free; |
322 | } | |
323 | ||
324 | #ifdef CONFIG_SMP | |
325 | pdev_entry->phys_proc_id = c->phys_proc_id; | |
326 | #endif | |
327 | pdev_entry->pdev = pdev; | |
328 | pdev_entry->cpu = cpu; | |
329 | list_add_tail(&pdev_entry->list, &pdev_list); | |
330 | mutex_unlock(&pdev_list_mutex); | |
331 | ||
332 | return 0; | |
333 | ||
334 | exit_device_free: | |
335 | kfree(pdev_entry); | |
336 | exit_device_put: | |
337 | platform_device_put(pdev); | |
338 | exit: | |
339 | mutex_unlock(&pdev_list_mutex); | |
340 | return err; | |
341 | } | |
342 | ||
a5f42a6b | 343 | static void __cpuinit pkgtemp_device_remove(unsigned int cpu) |
cb84b194 | 344 | { |
d9bca435 | 345 | struct pdev_entry *p; |
cb84b194 FY |
346 | unsigned int i; |
347 | int err; | |
348 | ||
349 | mutex_lock(&pdev_list_mutex); | |
d9bca435 | 350 | list_for_each_entry(p, &pdev_list, list) { |
cb84b194 FY |
351 | if (p->cpu != cpu) |
352 | continue; | |
353 | ||
354 | platform_device_unregister(p->pdev); | |
355 | list_del(&p->list); | |
d9bca435 | 356 | mutex_unlock(&pdev_list_mutex); |
cb84b194 FY |
357 | kfree(p); |
358 | for_each_cpu(i, cpu_core_mask(cpu)) { | |
359 | if (i != cpu) { | |
360 | err = pkgtemp_device_add(i); | |
361 | if (!err) | |
362 | break; | |
363 | } | |
364 | } | |
d9bca435 | 365 | return; |
cb84b194 FY |
366 | } |
367 | mutex_unlock(&pdev_list_mutex); | |
368 | } | |
369 | ||
370 | static int __cpuinit pkgtemp_cpu_callback(struct notifier_block *nfb, | |
371 | unsigned long action, void *hcpu) | |
372 | { | |
373 | unsigned int cpu = (unsigned long) hcpu; | |
374 | ||
375 | switch (action) { | |
376 | case CPU_ONLINE: | |
377 | case CPU_DOWN_FAILED: | |
378 | pkgtemp_device_add(cpu); | |
379 | break; | |
380 | case CPU_DOWN_PREPARE: | |
381 | pkgtemp_device_remove(cpu); | |
382 | break; | |
383 | } | |
384 | return NOTIFY_OK; | |
385 | } | |
386 | ||
387 | static struct notifier_block pkgtemp_cpu_notifier __refdata = { | |
388 | .notifier_call = pkgtemp_cpu_callback, | |
389 | }; | |
cb84b194 FY |
390 | |
391 | static int __init pkgtemp_init(void) | |
392 | { | |
393 | int i, err = -ENODEV; | |
cb84b194 FY |
394 | |
395 | /* quick check if we run Intel */ | |
396 | if (cpu_data(0).x86_vendor != X86_VENDOR_INTEL) | |
397 | goto exit; | |
398 | ||
399 | err = platform_driver_register(&pkgtemp_driver); | |
400 | if (err) | |
401 | goto exit; | |
402 | ||
fd53d084 CG |
403 | for_each_online_cpu(i) |
404 | pkgtemp_device_add(i); | |
405 | ||
406 | #ifndef CONFIG_HOTPLUG_CPU | |
cb84b194 FY |
407 | if (list_empty(&pdev_list)) { |
408 | err = -ENODEV; | |
409 | goto exit_driver_unreg; | |
410 | } | |
fd53d084 | 411 | #endif |
cb84b194 | 412 | |
cb84b194 | 413 | register_hotcpu_notifier(&pkgtemp_cpu_notifier); |
cb84b194 FY |
414 | return 0; |
415 | ||
fd53d084 | 416 | #ifndef CONFIG_HOTPLUG_CPU |
cb84b194 FY |
417 | exit_driver_unreg: |
418 | platform_driver_unregister(&pkgtemp_driver); | |
fd53d084 | 419 | #endif |
cb84b194 FY |
420 | exit: |
421 | return err; | |
422 | } | |
423 | ||
424 | static void __exit pkgtemp_exit(void) | |
425 | { | |
426 | struct pdev_entry *p, *n; | |
17c10d61 | 427 | |
cb84b194 | 428 | unregister_hotcpu_notifier(&pkgtemp_cpu_notifier); |
cb84b194 FY |
429 | mutex_lock(&pdev_list_mutex); |
430 | list_for_each_entry_safe(p, n, &pdev_list, list) { | |
431 | platform_device_unregister(p->pdev); | |
432 | list_del(&p->list); | |
433 | kfree(p); | |
434 | } | |
435 | mutex_unlock(&pdev_list_mutex); | |
436 | platform_driver_unregister(&pkgtemp_driver); | |
437 | } | |
438 | ||
439 | MODULE_AUTHOR("Fenghua Yu <fenghua.yu@intel.com>"); | |
440 | MODULE_DESCRIPTION("Intel processor package temperature monitor"); | |
441 | MODULE_LICENSE("GPL"); | |
442 | ||
443 | module_init(pkgtemp_init) | |
444 | module_exit(pkgtemp_exit) |