Commit | Line | Data |
---|---|---|
bebe4678 RM |
1 | /* |
2 | * coretemp.c - Linux kernel module for hardware monitoring | |
3 | * | |
4 | * Copyright (C) 2007 Rudolf Marek <r.marek@assembler.cz> | |
5 | * | |
6 | * Inspired from many hwmon drivers | |
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> | |
1fe63ab4 | 36 | #include <linux/pci.h> |
bebe4678 RM |
37 | #include <asm/msr.h> |
38 | #include <asm/processor.h> | |
39 | ||
40 | #define DRVNAME "coretemp" | |
41 | ||
6369a288 RM |
42 | typedef enum { SHOW_TEMP, SHOW_TJMAX, SHOW_TTARGET, SHOW_LABEL, |
43 | SHOW_NAME } SHOW; | |
bebe4678 RM |
44 | |
45 | /* | |
46 | * Functions declaration | |
47 | */ | |
48 | ||
49 | static struct coretemp_data *coretemp_update_device(struct device *dev); | |
50 | ||
51 | struct coretemp_data { | |
1beeffe4 | 52 | struct device *hwmon_dev; |
bebe4678 RM |
53 | struct mutex update_lock; |
54 | const char *name; | |
55 | u32 id; | |
56 | char valid; /* zero until following fields are valid */ | |
57 | unsigned long last_updated; /* in jiffies */ | |
58 | int temp; | |
59 | int tjmax; | |
6369a288 | 60 | int ttarget; |
bebe4678 RM |
61 | u8 alarm; |
62 | }; | |
63 | ||
bebe4678 RM |
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 coretemp_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, "Core %d\n", data->id); | |
79 | return ret; | |
80 | } | |
81 | ||
82 | static ssize_t show_alarm(struct device *dev, struct device_attribute | |
83 | *devattr, char *buf) | |
84 | { | |
85 | struct coretemp_data *data = coretemp_update_device(dev); | |
86 | /* read the Out-of-spec log, never clear */ | |
87 | return sprintf(buf, "%d\n", data->alarm); | |
88 | } | |
89 | ||
90 | static ssize_t show_temp(struct device *dev, | |
91 | struct device_attribute *devattr, char *buf) | |
92 | { | |
93 | struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); | |
94 | struct coretemp_data *data = coretemp_update_device(dev); | |
95 | int err; | |
96 | ||
97 | if (attr->index == SHOW_TEMP) | |
98 | err = data->valid ? sprintf(buf, "%d\n", data->temp) : -EAGAIN; | |
6369a288 | 99 | else if (attr->index == SHOW_TJMAX) |
bebe4678 | 100 | err = sprintf(buf, "%d\n", data->tjmax); |
6369a288 RM |
101 | else |
102 | err = sprintf(buf, "%d\n", data->ttarget); | |
bebe4678 RM |
103 | return err; |
104 | } | |
105 | ||
106 | static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, show_temp, NULL, | |
107 | SHOW_TEMP); | |
108 | static SENSOR_DEVICE_ATTR(temp1_crit, S_IRUGO, show_temp, NULL, | |
109 | SHOW_TJMAX); | |
6369a288 RM |
110 | static SENSOR_DEVICE_ATTR(temp1_max, S_IRUGO, show_temp, NULL, |
111 | SHOW_TTARGET); | |
bebe4678 RM |
112 | static DEVICE_ATTR(temp1_crit_alarm, S_IRUGO, show_alarm, NULL); |
113 | static SENSOR_DEVICE_ATTR(temp1_label, S_IRUGO, show_name, NULL, SHOW_LABEL); | |
114 | static SENSOR_DEVICE_ATTR(name, S_IRUGO, show_name, NULL, SHOW_NAME); | |
115 | ||
116 | static struct attribute *coretemp_attributes[] = { | |
117 | &sensor_dev_attr_name.dev_attr.attr, | |
118 | &sensor_dev_attr_temp1_label.dev_attr.attr, | |
119 | &dev_attr_temp1_crit_alarm.attr, | |
120 | &sensor_dev_attr_temp1_input.dev_attr.attr, | |
121 | &sensor_dev_attr_temp1_crit.dev_attr.attr, | |
122 | NULL | |
123 | }; | |
124 | ||
125 | static const struct attribute_group coretemp_group = { | |
126 | .attrs = coretemp_attributes, | |
127 | }; | |
128 | ||
129 | static struct coretemp_data *coretemp_update_device(struct device *dev) | |
130 | { | |
131 | struct coretemp_data *data = dev_get_drvdata(dev); | |
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 | rdmsr_on_cpu(data->id, MSR_IA32_THERM_STATUS, &eax, &edx); | |
140 | data->alarm = (eax >> 5) & 1; | |
141 | /* update only if data has been valid */ | |
142 | if (eax & 0x80000000) { | |
143 | data->temp = data->tjmax - (((eax >> 16) | |
144 | & 0x7f) * 1000); | |
145 | data->valid = 1; | |
146 | } else { | |
147 | dev_dbg(dev, "Temperature data invalid (0x%x)\n", eax); | |
148 | } | |
149 | data->last_updated = jiffies; | |
150 | } | |
151 | ||
152 | mutex_unlock(&data->update_lock); | |
153 | return data; | |
154 | } | |
155 | ||
118a8871 RM |
156 | static int __devinit adjust_tjmax(struct cpuinfo_x86 *c, u32 id, struct device *dev) |
157 | { | |
158 | /* The 100C is default for both mobile and non mobile CPUs */ | |
159 | ||
160 | int tjmax = 100000; | |
eccfed42 | 161 | int tjmax_ee = 85000; |
708a62bc | 162 | int usemsr_ee = 1; |
118a8871 RM |
163 | int err; |
164 | u32 eax, edx; | |
1fe63ab4 | 165 | struct pci_dev *host_bridge; |
118a8871 RM |
166 | |
167 | /* Early chips have no MSR for TjMax */ | |
168 | ||
169 | if ((c->x86_model == 0xf) && (c->x86_mask < 4)) { | |
708a62bc | 170 | usemsr_ee = 0; |
118a8871 RM |
171 | } |
172 | ||
1fe63ab4 | 173 | /* Atom CPUs */ |
708a62bc RM |
174 | |
175 | if (c->x86_model == 0x1c) { | |
176 | usemsr_ee = 0; | |
1fe63ab4 YW |
177 | |
178 | host_bridge = pci_get_bus_and_slot(0, PCI_DEVFN(0, 0)); | |
179 | ||
180 | if (host_bridge && host_bridge->vendor == PCI_VENDOR_ID_INTEL | |
181 | && (host_bridge->device == 0xa000 /* NM10 based nettop */ | |
182 | || host_bridge->device == 0xa010)) /* NM10 based netbook */ | |
183 | tjmax = 100000; | |
184 | else | |
185 | tjmax = 90000; | |
186 | ||
187 | pci_dev_put(host_bridge); | |
708a62bc RM |
188 | } |
189 | ||
190 | if ((c->x86_model > 0xe) && (usemsr_ee)) { | |
eccfed42 | 191 | u8 platform_id; |
118a8871 RM |
192 | |
193 | /* Now we can detect the mobile CPU using Intel provided table | |
194 | http://softwarecommunity.intel.com/Wiki/Mobility/720.htm | |
195 | For Core2 cores, check MSR 0x17, bit 28 1 = Mobile CPU | |
196 | */ | |
197 | ||
198 | err = rdmsr_safe_on_cpu(id, 0x17, &eax, &edx); | |
199 | if (err) { | |
200 | dev_warn(dev, | |
201 | "Unable to access MSR 0x17, assuming desktop" | |
202 | " CPU\n"); | |
708a62bc | 203 | usemsr_ee = 0; |
eccfed42 RM |
204 | } else if (c->x86_model < 0x17 && !(eax & 0x10000000)) { |
205 | /* Trust bit 28 up to Penryn, I could not find any | |
206 | documentation on that; if you happen to know | |
207 | someone at Intel please ask */ | |
708a62bc | 208 | usemsr_ee = 0; |
eccfed42 RM |
209 | } else { |
210 | /* Platform ID bits 52:50 (EDX starts at bit 32) */ | |
211 | platform_id = (edx >> 18) & 0x7; | |
212 | ||
213 | /* Mobile Penryn CPU seems to be platform ID 7 or 5 | |
214 | (guesswork) */ | |
215 | if ((c->x86_model == 0x17) && | |
216 | ((platform_id == 5) || (platform_id == 7))) { | |
217 | /* If MSR EE bit is set, set it to 90 degrees C, | |
218 | otherwise 105 degrees C */ | |
219 | tjmax_ee = 90000; | |
220 | tjmax = 105000; | |
221 | } | |
118a8871 RM |
222 | } |
223 | } | |
224 | ||
708a62bc | 225 | if (usemsr_ee) { |
118a8871 RM |
226 | |
227 | err = rdmsr_safe_on_cpu(id, 0xee, &eax, &edx); | |
228 | if (err) { | |
229 | dev_warn(dev, | |
230 | "Unable to access MSR 0xEE, for Tjmax, left" | |
231 | " at default"); | |
232 | } else if (eax & 0x40000000) { | |
eccfed42 | 233 | tjmax = tjmax_ee; |
118a8871 | 234 | } |
708a62bc RM |
235 | /* if we dont use msr EE it means we are desktop CPU (with exeception |
236 | of Atom) */ | |
237 | } else if (tjmax == 100000) { | |
118a8871 RM |
238 | dev_warn(dev, "Using relative temperature scale!\n"); |
239 | } | |
240 | ||
241 | return tjmax; | |
242 | } | |
243 | ||
bebe4678 RM |
244 | static int __devinit coretemp_probe(struct platform_device *pdev) |
245 | { | |
246 | struct coretemp_data *data; | |
92cb7612 | 247 | struct cpuinfo_x86 *c = &cpu_data(pdev->id); |
bebe4678 RM |
248 | int err; |
249 | u32 eax, edx; | |
250 | ||
251 | if (!(data = kzalloc(sizeof(struct coretemp_data), GFP_KERNEL))) { | |
252 | err = -ENOMEM; | |
253 | dev_err(&pdev->dev, "Out of memory\n"); | |
254 | goto exit; | |
255 | } | |
256 | ||
257 | data->id = pdev->id; | |
258 | data->name = "coretemp"; | |
259 | mutex_init(&data->update_lock); | |
bebe4678 RM |
260 | |
261 | /* test if we can access the THERM_STATUS MSR */ | |
262 | err = rdmsr_safe_on_cpu(data->id, MSR_IA32_THERM_STATUS, &eax, &edx); | |
263 | if (err) { | |
264 | dev_err(&pdev->dev, | |
265 | "Unable to access THERM_STATUS MSR, giving up\n"); | |
266 | goto exit_free; | |
267 | } | |
268 | ||
67f363b1 RM |
269 | /* Check if we have problem with errata AE18 of Core processors: |
270 | Readings might stop update when processor visited too deep sleep, | |
271 | fixed for stepping D0 (6EC). | |
272 | */ | |
273 | ||
274 | if ((c->x86_model == 0xe) && (c->x86_mask < 0xc)) { | |
275 | /* check for microcode update */ | |
276 | rdmsr_on_cpu(data->id, MSR_IA32_UCODE_REV, &eax, &edx); | |
277 | if (edx < 0x39) { | |
6d79af70 | 278 | err = -ENODEV; |
67f363b1 RM |
279 | dev_err(&pdev->dev, |
280 | "Errata AE18 not fixed, update BIOS or " | |
281 | "microcode of the CPU!\n"); | |
282 | goto exit_free; | |
283 | } | |
284 | } | |
285 | ||
118a8871 | 286 | data->tjmax = adjust_tjmax(c, data->id, &pdev->dev); |
bebe4678 RM |
287 | platform_set_drvdata(pdev, data); |
288 | ||
6369a288 | 289 | /* read the still undocumented IA32_TEMPERATURE_TARGET it exists |
708a62bc | 290 | on older CPUs but not in this register, Atoms don't have it either */ |
6369a288 | 291 | |
708a62bc | 292 | if ((c->x86_model > 0xe) && (c->x86_model != 0x1c)) { |
6369a288 RM |
293 | err = rdmsr_safe_on_cpu(data->id, 0x1a2, &eax, &edx); |
294 | if (err) { | |
295 | dev_warn(&pdev->dev, "Unable to read" | |
296 | " IA32_TEMPERATURE_TARGET MSR\n"); | |
297 | } else { | |
298 | data->ttarget = data->tjmax - | |
299 | (((eax >> 8) & 0xff) * 1000); | |
300 | err = device_create_file(&pdev->dev, | |
301 | &sensor_dev_attr_temp1_max.dev_attr); | |
302 | if (err) | |
303 | goto exit_free; | |
304 | } | |
305 | } | |
306 | ||
bebe4678 | 307 | if ((err = sysfs_create_group(&pdev->dev.kobj, &coretemp_group))) |
6369a288 | 308 | goto exit_dev; |
bebe4678 | 309 | |
1beeffe4 TJ |
310 | data->hwmon_dev = hwmon_device_register(&pdev->dev); |
311 | if (IS_ERR(data->hwmon_dev)) { | |
312 | err = PTR_ERR(data->hwmon_dev); | |
bebe4678 RM |
313 | dev_err(&pdev->dev, "Class registration failed (%d)\n", |
314 | err); | |
315 | goto exit_class; | |
316 | } | |
317 | ||
318 | return 0; | |
319 | ||
320 | exit_class: | |
321 | sysfs_remove_group(&pdev->dev.kobj, &coretemp_group); | |
6369a288 RM |
322 | exit_dev: |
323 | device_remove_file(&pdev->dev, &sensor_dev_attr_temp1_max.dev_attr); | |
bebe4678 RM |
324 | exit_free: |
325 | kfree(data); | |
326 | exit: | |
327 | return err; | |
328 | } | |
329 | ||
330 | static int __devexit coretemp_remove(struct platform_device *pdev) | |
331 | { | |
332 | struct coretemp_data *data = platform_get_drvdata(pdev); | |
333 | ||
1beeffe4 | 334 | hwmon_device_unregister(data->hwmon_dev); |
bebe4678 | 335 | sysfs_remove_group(&pdev->dev.kobj, &coretemp_group); |
6369a288 | 336 | device_remove_file(&pdev->dev, &sensor_dev_attr_temp1_max.dev_attr); |
bebe4678 RM |
337 | platform_set_drvdata(pdev, NULL); |
338 | kfree(data); | |
339 | return 0; | |
340 | } | |
341 | ||
342 | static struct platform_driver coretemp_driver = { | |
343 | .driver = { | |
344 | .owner = THIS_MODULE, | |
345 | .name = DRVNAME, | |
346 | }, | |
347 | .probe = coretemp_probe, | |
348 | .remove = __devexit_p(coretemp_remove), | |
349 | }; | |
350 | ||
351 | struct pdev_entry { | |
352 | struct list_head list; | |
353 | struct platform_device *pdev; | |
354 | unsigned int cpu; | |
355 | }; | |
356 | ||
357 | static LIST_HEAD(pdev_list); | |
358 | static DEFINE_MUTEX(pdev_list_mutex); | |
359 | ||
360 | static int __cpuinit coretemp_device_add(unsigned int cpu) | |
361 | { | |
362 | int err; | |
363 | struct platform_device *pdev; | |
364 | struct pdev_entry *pdev_entry; | |
365 | ||
366 | pdev = platform_device_alloc(DRVNAME, cpu); | |
367 | if (!pdev) { | |
368 | err = -ENOMEM; | |
369 | printk(KERN_ERR DRVNAME ": Device allocation failed\n"); | |
370 | goto exit; | |
371 | } | |
372 | ||
373 | pdev_entry = kzalloc(sizeof(struct pdev_entry), GFP_KERNEL); | |
374 | if (!pdev_entry) { | |
375 | err = -ENOMEM; | |
376 | goto exit_device_put; | |
377 | } | |
378 | ||
379 | err = platform_device_add(pdev); | |
380 | if (err) { | |
381 | printk(KERN_ERR DRVNAME ": Device addition failed (%d)\n", | |
382 | err); | |
383 | goto exit_device_free; | |
384 | } | |
385 | ||
386 | pdev_entry->pdev = pdev; | |
387 | pdev_entry->cpu = cpu; | |
388 | mutex_lock(&pdev_list_mutex); | |
389 | list_add_tail(&pdev_entry->list, &pdev_list); | |
390 | mutex_unlock(&pdev_list_mutex); | |
391 | ||
392 | return 0; | |
393 | ||
394 | exit_device_free: | |
395 | kfree(pdev_entry); | |
396 | exit_device_put: | |
397 | platform_device_put(pdev); | |
398 | exit: | |
399 | return err; | |
400 | } | |
401 | ||
402 | #ifdef CONFIG_HOTPLUG_CPU | |
d2bc7b13 | 403 | static void coretemp_device_remove(unsigned int cpu) |
bebe4678 RM |
404 | { |
405 | struct pdev_entry *p, *n; | |
406 | mutex_lock(&pdev_list_mutex); | |
407 | list_for_each_entry_safe(p, n, &pdev_list, list) { | |
408 | if (p->cpu == cpu) { | |
409 | platform_device_unregister(p->pdev); | |
410 | list_del(&p->list); | |
411 | kfree(p); | |
412 | } | |
413 | } | |
414 | mutex_unlock(&pdev_list_mutex); | |
415 | } | |
416 | ||
ba7c1927 | 417 | static int __cpuinit coretemp_cpu_callback(struct notifier_block *nfb, |
bebe4678 RM |
418 | unsigned long action, void *hcpu) |
419 | { | |
420 | unsigned int cpu = (unsigned long) hcpu; | |
421 | ||
422 | switch (action) { | |
423 | case CPU_ONLINE: | |
561d9a96 | 424 | case CPU_DOWN_FAILED: |
bebe4678 RM |
425 | coretemp_device_add(cpu); |
426 | break; | |
561d9a96 | 427 | case CPU_DOWN_PREPARE: |
bebe4678 RM |
428 | coretemp_device_remove(cpu); |
429 | break; | |
430 | } | |
431 | return NOTIFY_OK; | |
432 | } | |
433 | ||
ba7c1927 | 434 | static struct notifier_block coretemp_cpu_notifier __refdata = { |
bebe4678 RM |
435 | .notifier_call = coretemp_cpu_callback, |
436 | }; | |
437 | #endif /* !CONFIG_HOTPLUG_CPU */ | |
438 | ||
439 | static int __init coretemp_init(void) | |
440 | { | |
441 | int i, err = -ENODEV; | |
442 | struct pdev_entry *p, *n; | |
443 | ||
bebe4678 | 444 | /* quick check if we run Intel */ |
92cb7612 | 445 | if (cpu_data(0).x86_vendor != X86_VENDOR_INTEL) |
bebe4678 RM |
446 | goto exit; |
447 | ||
448 | err = platform_driver_register(&coretemp_driver); | |
449 | if (err) | |
450 | goto exit; | |
451 | ||
452 | for_each_online_cpu(i) { | |
92cb7612 | 453 | struct cpuinfo_x86 *c = &cpu_data(i); |
bebe4678 | 454 | |
eccfed42 RM |
455 | /* check if family 6, models 0xe (Pentium M DC), |
456 | 0xf (Core 2 DC 65nm), 0x16 (Core 2 SC 65nm), | |
fa08acd7 HW |
457 | 0x17 (Penryn 45nm), 0x1a (Nehalem), 0x1c (Atom), |
458 | 0x1e (Lynnfield) */ | |
bebe4678 | 459 | if ((c->cpuid_level < 0) || (c->x86 != 0x6) || |
c940336b | 460 | !((c->x86_model == 0xe) || (c->x86_model == 0xf) || |
34c86c1e | 461 | (c->x86_model == 0x16) || (c->x86_model == 0x17) || |
fa08acd7 HW |
462 | (c->x86_model == 0x1a) || (c->x86_model == 0x1c) || |
463 | (c->x86_model == 0x1e))) { | |
bebe4678 RM |
464 | |
465 | /* supported CPU not found, but report the unknown | |
466 | family 6 CPU */ | |
467 | if ((c->x86 == 0x6) && (c->x86_model > 0xf)) | |
468 | printk(KERN_WARNING DRVNAME ": Unknown CPU " | |
469 | "model %x\n", c->x86_model); | |
470 | continue; | |
471 | } | |
472 | ||
473 | err = coretemp_device_add(i); | |
474 | if (err) | |
475 | goto exit_devices_unreg; | |
476 | } | |
477 | if (list_empty(&pdev_list)) { | |
478 | err = -ENODEV; | |
479 | goto exit_driver_unreg; | |
480 | } | |
481 | ||
482 | #ifdef CONFIG_HOTPLUG_CPU | |
483 | register_hotcpu_notifier(&coretemp_cpu_notifier); | |
484 | #endif | |
485 | return 0; | |
486 | ||
487 | exit_devices_unreg: | |
488 | mutex_lock(&pdev_list_mutex); | |
489 | list_for_each_entry_safe(p, n, &pdev_list, list) { | |
490 | platform_device_unregister(p->pdev); | |
491 | list_del(&p->list); | |
492 | kfree(p); | |
493 | } | |
494 | mutex_unlock(&pdev_list_mutex); | |
495 | exit_driver_unreg: | |
496 | platform_driver_unregister(&coretemp_driver); | |
497 | exit: | |
498 | return err; | |
499 | } | |
500 | ||
501 | static void __exit coretemp_exit(void) | |
502 | { | |
503 | struct pdev_entry *p, *n; | |
504 | #ifdef CONFIG_HOTPLUG_CPU | |
505 | unregister_hotcpu_notifier(&coretemp_cpu_notifier); | |
506 | #endif | |
507 | mutex_lock(&pdev_list_mutex); | |
508 | list_for_each_entry_safe(p, n, &pdev_list, list) { | |
509 | platform_device_unregister(p->pdev); | |
510 | list_del(&p->list); | |
511 | kfree(p); | |
512 | } | |
513 | mutex_unlock(&pdev_list_mutex); | |
514 | platform_driver_unregister(&coretemp_driver); | |
515 | } | |
516 | ||
517 | MODULE_AUTHOR("Rudolf Marek <r.marek@assembler.cz>"); | |
518 | MODULE_DESCRIPTION("Intel Core temperature monitor"); | |
519 | MODULE_LICENSE("GPL"); | |
520 | ||
521 | module_init(coretemp_init) | |
522 | module_exit(coretemp_exit) |