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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 | ||
23 | #include <linux/module.h> | |
24 | #include <linux/delay.h> | |
25 | #include <linux/init.h> | |
26 | #include <linux/slab.h> | |
27 | #include <linux/jiffies.h> | |
28 | #include <linux/hwmon.h> | |
29 | #include <linux/sysfs.h> | |
30 | #include <linux/hwmon-sysfs.h> | |
31 | #include <linux/err.h> | |
32 | #include <linux/mutex.h> | |
33 | #include <linux/list.h> | |
34 | #include <linux/platform_device.h> | |
35 | #include <linux/cpu.h> | |
36 | #include <linux/pci.h> | |
37 | #include <asm/msr.h> | |
38 | #include <asm/processor.h> | |
39 | ||
40 | #define DRVNAME "pkgtemp" | |
41 | ||
42 | enum { SHOW_TEMP, SHOW_TJMAX, SHOW_TTARGET, SHOW_LABEL, SHOW_NAME }; | |
43 | ||
44 | /* | |
45 | * Functions declaration | |
46 | */ | |
47 | ||
48 | static struct pkgtemp_data *pkgtemp_update_device(struct device *dev); | |
49 | ||
50 | struct pkgtemp_data { | |
51 | struct device *hwmon_dev; | |
52 | struct mutex update_lock; | |
53 | const char *name; | |
54 | u32 id; | |
55 | u16 phys_proc_id; | |
56 | char valid; /* zero until following fields are valid */ | |
57 | unsigned long last_updated; /* in jiffies */ | |
58 | int temp; | |
59 | int tjmax; | |
60 | int ttarget; | |
61 | u8 alarm; | |
62 | }; | |
63 | ||
64 | /* | |
65 | * Sysfs stuff | |
66 | */ | |
67 | ||
68 | static ssize_t show_name(struct device *dev, struct device_attribute | |
69 | *devattr, char *buf) | |
70 | { | |
71 | int ret; | |
72 | struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); | |
73 | struct pkgtemp_data *data = dev_get_drvdata(dev); | |
74 | ||
75 | if (attr->index == SHOW_NAME) | |
76 | ret = sprintf(buf, "%s\n", data->name); | |
77 | else /* show label */ | |
78 | ret = sprintf(buf, "physical id %d\n", | |
79 | data->phys_proc_id); | |
80 | return ret; | |
81 | } | |
82 | ||
83 | static ssize_t show_alarm(struct device *dev, struct device_attribute | |
84 | *devattr, char *buf) | |
85 | { | |
86 | struct pkgtemp_data *data = pkgtemp_update_device(dev); | |
87 | /* read the Out-of-spec log, never clear */ | |
88 | return sprintf(buf, "%d\n", data->alarm); | |
89 | } | |
90 | ||
91 | static ssize_t show_temp(struct device *dev, | |
92 | struct device_attribute *devattr, char *buf) | |
93 | { | |
94 | struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); | |
95 | struct pkgtemp_data *data = pkgtemp_update_device(dev); | |
96 | int err = 0; | |
97 | ||
98 | if (attr->index == SHOW_TEMP) | |
99 | err = data->valid ? sprintf(buf, "%d\n", data->temp) : -EAGAIN; | |
100 | else if (attr->index == SHOW_TJMAX) | |
101 | err = sprintf(buf, "%d\n", data->tjmax); | |
102 | else | |
103 | err = sprintf(buf, "%d\n", data->ttarget); | |
104 | return err; | |
105 | } | |
106 | ||
107 | static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, show_temp, NULL, SHOW_TEMP); | |
108 | static SENSOR_DEVICE_ATTR(temp1_crit, S_IRUGO, show_temp, NULL, SHOW_TJMAX); | |
109 | static SENSOR_DEVICE_ATTR(temp1_max, S_IRUGO, show_temp, NULL, SHOW_TTARGET); | |
110 | static DEVICE_ATTR(temp1_crit_alarm, S_IRUGO, show_alarm, NULL); | |
111 | static SENSOR_DEVICE_ATTR(temp1_label, S_IRUGO, show_name, NULL, SHOW_LABEL); | |
112 | static SENSOR_DEVICE_ATTR(name, S_IRUGO, show_name, NULL, SHOW_NAME); | |
113 | ||
114 | static struct attribute *pkgtemp_attributes[] = { | |
115 | &sensor_dev_attr_name.dev_attr.attr, | |
116 | &sensor_dev_attr_temp1_label.dev_attr.attr, | |
117 | &dev_attr_temp1_crit_alarm.attr, | |
118 | &sensor_dev_attr_temp1_input.dev_attr.attr, | |
119 | &sensor_dev_attr_temp1_crit.dev_attr.attr, | |
120 | NULL | |
121 | }; | |
122 | ||
123 | static const struct attribute_group pkgtemp_group = { | |
124 | .attrs = pkgtemp_attributes, | |
125 | }; | |
126 | ||
127 | static struct pkgtemp_data *pkgtemp_update_device(struct device *dev) | |
128 | { | |
129 | struct pkgtemp_data *data = dev_get_drvdata(dev); | |
130 | unsigned int cpu; | |
131 | int err; | |
132 | ||
133 | mutex_lock(&data->update_lock); | |
134 | ||
135 | if (!data->valid || time_after(jiffies, data->last_updated + HZ)) { | |
136 | u32 eax, edx; | |
137 | ||
138 | data->valid = 0; | |
139 | cpu = data->id; | |
140 | err = rdmsr_on_cpu(cpu, MSR_IA32_PACKAGE_THERM_STATUS, | |
141 | &eax, &edx); | |
142 | if (!err) { | |
143 | data->alarm = (eax >> 5) & 1; | |
144 | data->temp = data->tjmax - (((eax >> 16) | |
145 | & 0x7f) * 1000); | |
146 | data->valid = 1; | |
147 | } else | |
148 | dev_dbg(dev, "Temperature data invalid (0x%x)\n", eax); | |
149 | ||
150 | data->last_updated = jiffies; | |
151 | } | |
152 | ||
153 | mutex_unlock(&data->update_lock); | |
154 | return data; | |
155 | } | |
156 | ||
157 | static int get_tjmax(int cpu, struct device *dev) | |
158 | { | |
159 | int default_tjmax = 100000; | |
160 | int err; | |
161 | u32 eax, edx; | |
162 | u32 val; | |
163 | ||
164 | /* IA32_TEMPERATURE_TARGET contains the TjMax value */ | |
165 | err = rdmsr_safe_on_cpu(cpu, MSR_IA32_TEMPERATURE_TARGET, &eax, &edx); | |
166 | if (!err) { | |
167 | val = (eax >> 16) & 0xff; | |
168 | if ((val > 80) && (val < 120)) { | |
169 | dev_info(dev, "TjMax is %d C.\n", val); | |
170 | return val * 1000; | |
171 | } | |
172 | } | |
173 | dev_warn(dev, "Unable to read TjMax from CPU.\n"); | |
174 | return default_tjmax; | |
175 | } | |
176 | ||
177 | static int __devinit pkgtemp_probe(struct platform_device *pdev) | |
178 | { | |
179 | struct pkgtemp_data *data; | |
180 | int err; | |
181 | u32 eax, edx; | |
182 | #ifdef CONFIG_SMP | |
183 | struct cpuinfo_x86 *c = &cpu_data(pdev->id); | |
184 | #endif | |
185 | ||
186 | data = kzalloc(sizeof(struct pkgtemp_data), GFP_KERNEL); | |
187 | if (!data) { | |
188 | err = -ENOMEM; | |
189 | dev_err(&pdev->dev, "Out of memory\n"); | |
190 | goto exit; | |
191 | } | |
192 | ||
193 | data->id = pdev->id; | |
194 | #ifdef CONFIG_SMP | |
195 | data->phys_proc_id = c->phys_proc_id; | |
196 | #endif | |
197 | data->name = "pkgtemp"; | |
198 | mutex_init(&data->update_lock); | |
199 | ||
200 | /* test if we can access the THERM_STATUS MSR */ | |
201 | err = rdmsr_safe_on_cpu(data->id, MSR_IA32_PACKAGE_THERM_STATUS, | |
202 | &eax, &edx); | |
203 | if (err) { | |
204 | dev_err(&pdev->dev, | |
205 | "Unable to access THERM_STATUS MSR, giving up\n"); | |
206 | goto exit_free; | |
207 | } | |
208 | ||
209 | data->tjmax = get_tjmax(data->id, &pdev->dev); | |
210 | platform_set_drvdata(pdev, data); | |
211 | ||
212 | err = rdmsr_safe_on_cpu(data->id, MSR_IA32_TEMPERATURE_TARGET, | |
213 | &eax, &edx); | |
214 | if (err) { | |
215 | dev_warn(&pdev->dev, "Unable to read" | |
216 | " IA32_TEMPERATURE_TARGET MSR\n"); | |
217 | } else { | |
218 | data->ttarget = data->tjmax - (((eax >> 8) & 0xff) * 1000); | |
219 | err = device_create_file(&pdev->dev, | |
220 | &sensor_dev_attr_temp1_max.dev_attr); | |
221 | if (err) | |
222 | goto exit_free; | |
223 | } | |
224 | ||
225 | err = sysfs_create_group(&pdev->dev.kobj, &pkgtemp_group); | |
226 | if (err) | |
227 | goto exit_free; | |
228 | ||
229 | data->hwmon_dev = hwmon_device_register(&pdev->dev); | |
230 | if (IS_ERR(data->hwmon_dev)) { | |
231 | err = PTR_ERR(data->hwmon_dev); | |
232 | dev_err(&pdev->dev, "Class registration failed (%d)\n", | |
233 | err); | |
234 | goto exit_class; | |
235 | } | |
236 | ||
237 | return 0; | |
238 | ||
239 | exit_class: | |
240 | sysfs_remove_group(&pdev->dev.kobj, &pkgtemp_group); | |
241 | exit_free: | |
242 | kfree(data); | |
243 | exit: | |
244 | return err; | |
245 | } | |
246 | ||
247 | static int __devexit pkgtemp_remove(struct platform_device *pdev) | |
248 | { | |
249 | struct pkgtemp_data *data = platform_get_drvdata(pdev); | |
250 | ||
251 | hwmon_device_unregister(data->hwmon_dev); | |
252 | sysfs_remove_group(&pdev->dev.kobj, &pkgtemp_group); | |
253 | platform_set_drvdata(pdev, NULL); | |
254 | kfree(data); | |
255 | return 0; | |
256 | } | |
257 | ||
258 | static struct platform_driver pkgtemp_driver = { | |
259 | .driver = { | |
260 | .owner = THIS_MODULE, | |
261 | .name = DRVNAME, | |
262 | }, | |
263 | .probe = pkgtemp_probe, | |
264 | .remove = __devexit_p(pkgtemp_remove), | |
265 | }; | |
266 | ||
267 | struct pdev_entry { | |
268 | struct list_head list; | |
269 | struct platform_device *pdev; | |
270 | unsigned int cpu; | |
271 | #ifdef CONFIG_SMP | |
272 | u16 phys_proc_id; | |
273 | #endif | |
274 | }; | |
275 | ||
276 | static LIST_HEAD(pdev_list); | |
277 | static DEFINE_MUTEX(pdev_list_mutex); | |
278 | ||
279 | static int __cpuinit pkgtemp_device_add(unsigned int cpu) | |
280 | { | |
281 | int err; | |
282 | struct platform_device *pdev; | |
283 | struct pdev_entry *pdev_entry; | |
284 | #ifdef CONFIG_SMP | |
285 | struct cpuinfo_x86 *c = &cpu_data(cpu); | |
286 | #endif | |
287 | ||
288 | mutex_lock(&pdev_list_mutex); | |
289 | ||
290 | #ifdef CONFIG_SMP | |
291 | /* Only keep the first entry in each package */ | |
292 | list_for_each_entry(pdev_entry, &pdev_list, list) { | |
293 | if (c->phys_proc_id == pdev_entry->phys_proc_id) { | |
294 | err = 0; /* Not an error */ | |
295 | goto exit; | |
296 | } | |
297 | } | |
298 | #endif | |
299 | ||
300 | pdev = platform_device_alloc(DRVNAME, cpu); | |
301 | if (!pdev) { | |
302 | err = -ENOMEM; | |
303 | printk(KERN_ERR DRVNAME ": Device allocation failed\n"); | |
304 | goto exit; | |
305 | } | |
306 | ||
307 | pdev_entry = kzalloc(sizeof(struct pdev_entry), GFP_KERNEL); | |
308 | if (!pdev_entry) { | |
309 | err = -ENOMEM; | |
310 | goto exit_device_put; | |
311 | } | |
312 | ||
313 | err = platform_device_add(pdev); | |
314 | if (err) { | |
315 | printk(KERN_ERR DRVNAME ": Device addition failed (%d)\n", | |
316 | err); | |
317 | goto exit_device_free; | |
318 | } | |
319 | ||
320 | #ifdef CONFIG_SMP | |
321 | pdev_entry->phys_proc_id = c->phys_proc_id; | |
322 | #endif | |
323 | pdev_entry->pdev = pdev; | |
324 | pdev_entry->cpu = cpu; | |
325 | list_add_tail(&pdev_entry->list, &pdev_list); | |
326 | mutex_unlock(&pdev_list_mutex); | |
327 | ||
328 | return 0; | |
329 | ||
330 | exit_device_free: | |
331 | kfree(pdev_entry); | |
332 | exit_device_put: | |
333 | platform_device_put(pdev); | |
334 | exit: | |
335 | mutex_unlock(&pdev_list_mutex); | |
336 | return err; | |
337 | } | |
338 | ||
339 | #ifdef CONFIG_HOTPLUG_CPU | |
340 | static void pkgtemp_device_remove(unsigned int cpu) | |
341 | { | |
d9bca435 | 342 | struct pdev_entry *p; |
cb84b194 FY |
343 | unsigned int i; |
344 | int err; | |
345 | ||
346 | mutex_lock(&pdev_list_mutex); | |
d9bca435 | 347 | list_for_each_entry(p, &pdev_list, list) { |
cb84b194 FY |
348 | if (p->cpu != cpu) |
349 | continue; | |
350 | ||
351 | platform_device_unregister(p->pdev); | |
352 | list_del(&p->list); | |
d9bca435 | 353 | mutex_unlock(&pdev_list_mutex); |
cb84b194 FY |
354 | kfree(p); |
355 | for_each_cpu(i, cpu_core_mask(cpu)) { | |
356 | if (i != cpu) { | |
357 | err = pkgtemp_device_add(i); | |
358 | if (!err) | |
359 | break; | |
360 | } | |
361 | } | |
d9bca435 | 362 | return; |
cb84b194 FY |
363 | } |
364 | mutex_unlock(&pdev_list_mutex); | |
365 | } | |
366 | ||
367 | static int __cpuinit pkgtemp_cpu_callback(struct notifier_block *nfb, | |
368 | unsigned long action, void *hcpu) | |
369 | { | |
370 | unsigned int cpu = (unsigned long) hcpu; | |
371 | ||
372 | switch (action) { | |
373 | case CPU_ONLINE: | |
374 | case CPU_DOWN_FAILED: | |
375 | pkgtemp_device_add(cpu); | |
376 | break; | |
377 | case CPU_DOWN_PREPARE: | |
378 | pkgtemp_device_remove(cpu); | |
379 | break; | |
380 | } | |
381 | return NOTIFY_OK; | |
382 | } | |
383 | ||
384 | static struct notifier_block pkgtemp_cpu_notifier __refdata = { | |
385 | .notifier_call = pkgtemp_cpu_callback, | |
386 | }; | |
387 | #endif /* !CONFIG_HOTPLUG_CPU */ | |
388 | ||
389 | static int __init pkgtemp_init(void) | |
390 | { | |
391 | int i, err = -ENODEV; | |
392 | struct pdev_entry *p, *n; | |
393 | ||
394 | /* quick check if we run Intel */ | |
395 | if (cpu_data(0).x86_vendor != X86_VENDOR_INTEL) | |
396 | goto exit; | |
397 | ||
398 | err = platform_driver_register(&pkgtemp_driver); | |
399 | if (err) | |
400 | goto exit; | |
401 | ||
402 | for_each_online_cpu(i) { | |
403 | struct cpuinfo_x86 *c = &cpu_data(i); | |
404 | ||
405 | if (!cpu_has(c, X86_FEATURE_PTS)) | |
406 | continue; | |
407 | ||
408 | err = pkgtemp_device_add(i); | |
409 | if (err) | |
410 | goto exit_devices_unreg; | |
411 | } | |
412 | if (list_empty(&pdev_list)) { | |
413 | err = -ENODEV; | |
414 | goto exit_driver_unreg; | |
415 | } | |
416 | ||
417 | #ifdef CONFIG_HOTPLUG_CPU | |
418 | register_hotcpu_notifier(&pkgtemp_cpu_notifier); | |
419 | #endif | |
420 | return 0; | |
421 | ||
422 | exit_devices_unreg: | |
423 | mutex_lock(&pdev_list_mutex); | |
424 | list_for_each_entry_safe(p, n, &pdev_list, list) { | |
425 | platform_device_unregister(p->pdev); | |
426 | list_del(&p->list); | |
427 | kfree(p); | |
428 | } | |
429 | mutex_unlock(&pdev_list_mutex); | |
430 | exit_driver_unreg: | |
431 | platform_driver_unregister(&pkgtemp_driver); | |
432 | exit: | |
433 | return err; | |
434 | } | |
435 | ||
436 | static void __exit pkgtemp_exit(void) | |
437 | { | |
438 | struct pdev_entry *p, *n; | |
439 | #ifdef CONFIG_HOTPLUG_CPU | |
440 | unregister_hotcpu_notifier(&pkgtemp_cpu_notifier); | |
441 | #endif | |
442 | mutex_lock(&pdev_list_mutex); | |
443 | list_for_each_entry_safe(p, n, &pdev_list, list) { | |
444 | platform_device_unregister(p->pdev); | |
445 | list_del(&p->list); | |
446 | kfree(p); | |
447 | } | |
448 | mutex_unlock(&pdev_list_mutex); | |
449 | platform_driver_unregister(&pkgtemp_driver); | |
450 | } | |
451 | ||
452 | MODULE_AUTHOR("Fenghua Yu <fenghua.yu@intel.com>"); | |
453 | MODULE_DESCRIPTION("Intel processor package temperature monitor"); | |
454 | MODULE_LICENSE("GPL"); | |
455 | ||
456 | module_init(pkgtemp_init) | |
457 | module_exit(pkgtemp_exit) |