blob: caef39cda8c8e8d504eb1777d6aa409ff6bf7424 [file] [log] [blame]
Rudolf Marekbebe4672007-05-08 17:22:02 +02001/*
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>
36#include <asm/msr.h>
37#include <asm/processor.h>
38
39#define DRVNAME "coretemp"
40
Rudolf Marek6369a2882008-01-18 00:42:54 +010041typedef enum { SHOW_TEMP, SHOW_TJMAX, SHOW_TTARGET, SHOW_LABEL,
42 SHOW_NAME } SHOW;
Rudolf Marekbebe4672007-05-08 17:22:02 +020043
44/*
45 * Functions declaration
46 */
47
48static struct coretemp_data *coretemp_update_device(struct device *dev);
49
50struct coretemp_data {
Tony Jones1beeffe2007-08-20 13:46:20 -070051 struct device *hwmon_dev;
Rudolf Marekbebe4672007-05-08 17:22:02 +020052 struct mutex update_lock;
53 const char *name;
54 u32 id;
55 char valid; /* zero until following fields are valid */
56 unsigned long last_updated; /* in jiffies */
57 int temp;
58 int tjmax;
Rudolf Marek6369a2882008-01-18 00:42:54 +010059 int ttarget;
Rudolf Marekbebe4672007-05-08 17:22:02 +020060 u8 alarm;
61};
62
Rudolf Marekbebe4672007-05-08 17:22:02 +020063/*
64 * Sysfs stuff
65 */
66
67static ssize_t show_name(struct device *dev, struct device_attribute
68 *devattr, char *buf)
69{
70 int ret;
71 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
72 struct coretemp_data *data = dev_get_drvdata(dev);
73
74 if (attr->index == SHOW_NAME)
75 ret = sprintf(buf, "%s\n", data->name);
76 else /* show label */
77 ret = sprintf(buf, "Core %d\n", data->id);
78 return ret;
79}
80
81static ssize_t show_alarm(struct device *dev, struct device_attribute
82 *devattr, char *buf)
83{
84 struct coretemp_data *data = coretemp_update_device(dev);
85 /* read the Out-of-spec log, never clear */
86 return sprintf(buf, "%d\n", data->alarm);
87}
88
89static ssize_t show_temp(struct device *dev,
90 struct device_attribute *devattr, char *buf)
91{
92 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
93 struct coretemp_data *data = coretemp_update_device(dev);
94 int err;
95
96 if (attr->index == SHOW_TEMP)
97 err = data->valid ? sprintf(buf, "%d\n", data->temp) : -EAGAIN;
Rudolf Marek6369a2882008-01-18 00:42:54 +010098 else if (attr->index == SHOW_TJMAX)
Rudolf Marekbebe4672007-05-08 17:22:02 +020099 err = sprintf(buf, "%d\n", data->tjmax);
Rudolf Marek6369a2882008-01-18 00:42:54 +0100100 else
101 err = sprintf(buf, "%d\n", data->ttarget);
Rudolf Marekbebe4672007-05-08 17:22:02 +0200102 return err;
103}
104
105static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, show_temp, NULL,
106 SHOW_TEMP);
107static SENSOR_DEVICE_ATTR(temp1_crit, S_IRUGO, show_temp, NULL,
108 SHOW_TJMAX);
Rudolf Marek6369a2882008-01-18 00:42:54 +0100109static SENSOR_DEVICE_ATTR(temp1_max, S_IRUGO, show_temp, NULL,
110 SHOW_TTARGET);
Rudolf Marekbebe4672007-05-08 17:22:02 +0200111static DEVICE_ATTR(temp1_crit_alarm, S_IRUGO, show_alarm, NULL);
112static SENSOR_DEVICE_ATTR(temp1_label, S_IRUGO, show_name, NULL, SHOW_LABEL);
113static SENSOR_DEVICE_ATTR(name, S_IRUGO, show_name, NULL, SHOW_NAME);
114
115static struct attribute *coretemp_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
124static const struct attribute_group coretemp_group = {
125 .attrs = coretemp_attributes,
126};
127
128static struct coretemp_data *coretemp_update_device(struct device *dev)
129{
130 struct coretemp_data *data = dev_get_drvdata(dev);
131
132 mutex_lock(&data->update_lock);
133
134 if (!data->valid || time_after(jiffies, data->last_updated + HZ)) {
135 u32 eax, edx;
136
137 data->valid = 0;
138 rdmsr_on_cpu(data->id, MSR_IA32_THERM_STATUS, &eax, &edx);
139 data->alarm = (eax >> 5) & 1;
140 /* update only if data has been valid */
141 if (eax & 0x80000000) {
142 data->temp = data->tjmax - (((eax >> 16)
143 & 0x7f) * 1000);
144 data->valid = 1;
145 } else {
146 dev_dbg(dev, "Temperature data invalid (0x%x)\n", eax);
147 }
148 data->last_updated = jiffies;
149 }
150
151 mutex_unlock(&data->update_lock);
152 return data;
153}
154
Rudolf Marek118a8872008-02-17 22:59:39 +0100155static int __devinit adjust_tjmax(struct cpuinfo_x86 *c, u32 id, struct device *dev)
156{
157 /* The 100C is default for both mobile and non mobile CPUs */
158
159 int tjmax = 100000;
Rudolf Marekeccfed42009-09-23 22:59:42 +0200160 int tjmax_ee = 85000;
Rudolf Marek708a62b2009-09-23 22:59:42 +0200161 int usemsr_ee = 1;
Rudolf Marek118a8872008-02-17 22:59:39 +0100162 int err;
163 u32 eax, edx;
164
165 /* Early chips have no MSR for TjMax */
166
167 if ((c->x86_model == 0xf) && (c->x86_mask < 4)) {
Rudolf Marek708a62b2009-09-23 22:59:42 +0200168 usemsr_ee = 0;
Rudolf Marek118a8872008-02-17 22:59:39 +0100169 }
170
Rudolf Marek708a62b2009-09-23 22:59:42 +0200171 /* Atoms seems to have TjMax at 90C */
172
173 if (c->x86_model == 0x1c) {
174 usemsr_ee = 0;
175 tjmax = 90000;
176 }
177
178 if ((c->x86_model > 0xe) && (usemsr_ee)) {
Rudolf Marekeccfed42009-09-23 22:59:42 +0200179 u8 platform_id;
Rudolf Marek118a8872008-02-17 22:59:39 +0100180
181 /* Now we can detect the mobile CPU using Intel provided table
182 http://softwarecommunity.intel.com/Wiki/Mobility/720.htm
183 For Core2 cores, check MSR 0x17, bit 28 1 = Mobile CPU
184 */
185
186 err = rdmsr_safe_on_cpu(id, 0x17, &eax, &edx);
187 if (err) {
188 dev_warn(dev,
189 "Unable to access MSR 0x17, assuming desktop"
190 " CPU\n");
Rudolf Marek708a62b2009-09-23 22:59:42 +0200191 usemsr_ee = 0;
Rudolf Marekeccfed42009-09-23 22:59:42 +0200192 } else if (c->x86_model < 0x17 && !(eax & 0x10000000)) {
193 /* Trust bit 28 up to Penryn, I could not find any
194 documentation on that; if you happen to know
195 someone at Intel please ask */
Rudolf Marek708a62b2009-09-23 22:59:42 +0200196 usemsr_ee = 0;
Rudolf Marekeccfed42009-09-23 22:59:42 +0200197 } else {
198 /* Platform ID bits 52:50 (EDX starts at bit 32) */
199 platform_id = (edx >> 18) & 0x7;
200
201 /* Mobile Penryn CPU seems to be platform ID 7 or 5
202 (guesswork) */
203 if ((c->x86_model == 0x17) &&
204 ((platform_id == 5) || (platform_id == 7))) {
205 /* If MSR EE bit is set, set it to 90 degrees C,
206 otherwise 105 degrees C */
207 tjmax_ee = 90000;
208 tjmax = 105000;
209 }
Rudolf Marek118a8872008-02-17 22:59:39 +0100210 }
211 }
212
Rudolf Marek708a62b2009-09-23 22:59:42 +0200213 if (usemsr_ee) {
Rudolf Marek118a8872008-02-17 22:59:39 +0100214
215 err = rdmsr_safe_on_cpu(id, 0xee, &eax, &edx);
216 if (err) {
217 dev_warn(dev,
218 "Unable to access MSR 0xEE, for Tjmax, left"
219 " at default");
220 } else if (eax & 0x40000000) {
Rudolf Marekeccfed42009-09-23 22:59:42 +0200221 tjmax = tjmax_ee;
Rudolf Marek118a8872008-02-17 22:59:39 +0100222 }
Rudolf Marek708a62b2009-09-23 22:59:42 +0200223 /* if we dont use msr EE it means we are desktop CPU (with exeception
224 of Atom) */
225 } else if (tjmax == 100000) {
Rudolf Marek118a8872008-02-17 22:59:39 +0100226 dev_warn(dev, "Using relative temperature scale!\n");
227 }
228
229 return tjmax;
230}
231
Rudolf Marekbebe4672007-05-08 17:22:02 +0200232static int __devinit coretemp_probe(struct platform_device *pdev)
233{
234 struct coretemp_data *data;
Mike Travis92cb7612007-10-19 20:35:04 +0200235 struct cpuinfo_x86 *c = &cpu_data(pdev->id);
Rudolf Marekbebe4672007-05-08 17:22:02 +0200236 int err;
237 u32 eax, edx;
238
239 if (!(data = kzalloc(sizeof(struct coretemp_data), GFP_KERNEL))) {
240 err = -ENOMEM;
241 dev_err(&pdev->dev, "Out of memory\n");
242 goto exit;
243 }
244
245 data->id = pdev->id;
246 data->name = "coretemp";
247 mutex_init(&data->update_lock);
Rudolf Marekbebe4672007-05-08 17:22:02 +0200248
249 /* test if we can access the THERM_STATUS MSR */
250 err = rdmsr_safe_on_cpu(data->id, MSR_IA32_THERM_STATUS, &eax, &edx);
251 if (err) {
252 dev_err(&pdev->dev,
253 "Unable to access THERM_STATUS MSR, giving up\n");
254 goto exit_free;
255 }
256
Rudolf Marek67f363b2007-05-27 22:17:43 +0200257 /* Check if we have problem with errata AE18 of Core processors:
258 Readings might stop update when processor visited too deep sleep,
259 fixed for stepping D0 (6EC).
260 */
261
262 if ((c->x86_model == 0xe) && (c->x86_mask < 0xc)) {
263 /* check for microcode update */
264 rdmsr_on_cpu(data->id, MSR_IA32_UCODE_REV, &eax, &edx);
265 if (edx < 0x39) {
Jean Delvare6d79af72007-06-23 17:16:24 -0700266 err = -ENODEV;
Rudolf Marek67f363b2007-05-27 22:17:43 +0200267 dev_err(&pdev->dev,
268 "Errata AE18 not fixed, update BIOS or "
269 "microcode of the CPU!\n");
270 goto exit_free;
271 }
272 }
273
Rudolf Marek118a8872008-02-17 22:59:39 +0100274 data->tjmax = adjust_tjmax(c, data->id, &pdev->dev);
Rudolf Marekbebe4672007-05-08 17:22:02 +0200275 platform_set_drvdata(pdev, data);
276
Rudolf Marek6369a2882008-01-18 00:42:54 +0100277 /* read the still undocumented IA32_TEMPERATURE_TARGET it exists
Rudolf Marek708a62b2009-09-23 22:59:42 +0200278 on older CPUs but not in this register, Atoms don't have it either */
Rudolf Marek6369a2882008-01-18 00:42:54 +0100279
Rudolf Marek708a62b2009-09-23 22:59:42 +0200280 if ((c->x86_model > 0xe) && (c->x86_model != 0x1c)) {
Rudolf Marek6369a2882008-01-18 00:42:54 +0100281 err = rdmsr_safe_on_cpu(data->id, 0x1a2, &eax, &edx);
282 if (err) {
283 dev_warn(&pdev->dev, "Unable to read"
284 " IA32_TEMPERATURE_TARGET MSR\n");
285 } else {
286 data->ttarget = data->tjmax -
287 (((eax >> 8) & 0xff) * 1000);
288 err = device_create_file(&pdev->dev,
289 &sensor_dev_attr_temp1_max.dev_attr);
290 if (err)
291 goto exit_free;
292 }
293 }
294
Rudolf Marekbebe4672007-05-08 17:22:02 +0200295 if ((err = sysfs_create_group(&pdev->dev.kobj, &coretemp_group)))
Rudolf Marek6369a2882008-01-18 00:42:54 +0100296 goto exit_dev;
Rudolf Marekbebe4672007-05-08 17:22:02 +0200297
Tony Jones1beeffe2007-08-20 13:46:20 -0700298 data->hwmon_dev = hwmon_device_register(&pdev->dev);
299 if (IS_ERR(data->hwmon_dev)) {
300 err = PTR_ERR(data->hwmon_dev);
Rudolf Marekbebe4672007-05-08 17:22:02 +0200301 dev_err(&pdev->dev, "Class registration failed (%d)\n",
302 err);
303 goto exit_class;
304 }
305
306 return 0;
307
308exit_class:
309 sysfs_remove_group(&pdev->dev.kobj, &coretemp_group);
Rudolf Marek6369a2882008-01-18 00:42:54 +0100310exit_dev:
311 device_remove_file(&pdev->dev, &sensor_dev_attr_temp1_max.dev_attr);
Rudolf Marekbebe4672007-05-08 17:22:02 +0200312exit_free:
313 kfree(data);
314exit:
315 return err;
316}
317
318static int __devexit coretemp_remove(struct platform_device *pdev)
319{
320 struct coretemp_data *data = platform_get_drvdata(pdev);
321
Tony Jones1beeffe2007-08-20 13:46:20 -0700322 hwmon_device_unregister(data->hwmon_dev);
Rudolf Marekbebe4672007-05-08 17:22:02 +0200323 sysfs_remove_group(&pdev->dev.kobj, &coretemp_group);
Rudolf Marek6369a2882008-01-18 00:42:54 +0100324 device_remove_file(&pdev->dev, &sensor_dev_attr_temp1_max.dev_attr);
Rudolf Marekbebe4672007-05-08 17:22:02 +0200325 platform_set_drvdata(pdev, NULL);
326 kfree(data);
327 return 0;
328}
329
330static struct platform_driver coretemp_driver = {
331 .driver = {
332 .owner = THIS_MODULE,
333 .name = DRVNAME,
334 },
335 .probe = coretemp_probe,
336 .remove = __devexit_p(coretemp_remove),
337};
338
339struct pdev_entry {
340 struct list_head list;
341 struct platform_device *pdev;
342 unsigned int cpu;
343};
344
345static LIST_HEAD(pdev_list);
346static DEFINE_MUTEX(pdev_list_mutex);
347
348static int __cpuinit coretemp_device_add(unsigned int cpu)
349{
350 int err;
351 struct platform_device *pdev;
352 struct pdev_entry *pdev_entry;
353
354 pdev = platform_device_alloc(DRVNAME, cpu);
355 if (!pdev) {
356 err = -ENOMEM;
357 printk(KERN_ERR DRVNAME ": Device allocation failed\n");
358 goto exit;
359 }
360
361 pdev_entry = kzalloc(sizeof(struct pdev_entry), GFP_KERNEL);
362 if (!pdev_entry) {
363 err = -ENOMEM;
364 goto exit_device_put;
365 }
366
367 err = platform_device_add(pdev);
368 if (err) {
369 printk(KERN_ERR DRVNAME ": Device addition failed (%d)\n",
370 err);
371 goto exit_device_free;
372 }
373
374 pdev_entry->pdev = pdev;
375 pdev_entry->cpu = cpu;
376 mutex_lock(&pdev_list_mutex);
377 list_add_tail(&pdev_entry->list, &pdev_list);
378 mutex_unlock(&pdev_list_mutex);
379
380 return 0;
381
382exit_device_free:
383 kfree(pdev_entry);
384exit_device_put:
385 platform_device_put(pdev);
386exit:
387 return err;
388}
389
390#ifdef CONFIG_HOTPLUG_CPU
Adrian Bunkd2bc7b12007-07-06 01:23:06 +0200391static void coretemp_device_remove(unsigned int cpu)
Rudolf Marekbebe4672007-05-08 17:22:02 +0200392{
393 struct pdev_entry *p, *n;
394 mutex_lock(&pdev_list_mutex);
395 list_for_each_entry_safe(p, n, &pdev_list, list) {
396 if (p->cpu == cpu) {
397 platform_device_unregister(p->pdev);
398 list_del(&p->list);
399 kfree(p);
400 }
401 }
402 mutex_unlock(&pdev_list_mutex);
403}
404
Sam Ravnborgba7c1922008-02-17 13:22:51 +0100405static int __cpuinit coretemp_cpu_callback(struct notifier_block *nfb,
Rudolf Marekbebe4672007-05-08 17:22:02 +0200406 unsigned long action, void *hcpu)
407{
408 unsigned int cpu = (unsigned long) hcpu;
409
410 switch (action) {
411 case CPU_ONLINE:
Rafael J. Wysocki561d9a92007-12-03 18:01:50 +0100412 case CPU_DOWN_FAILED:
Rudolf Marekbebe4672007-05-08 17:22:02 +0200413 coretemp_device_add(cpu);
414 break;
Rafael J. Wysocki561d9a92007-12-03 18:01:50 +0100415 case CPU_DOWN_PREPARE:
Rudolf Marekbebe4672007-05-08 17:22:02 +0200416 coretemp_device_remove(cpu);
417 break;
418 }
419 return NOTIFY_OK;
420}
421
Sam Ravnborgba7c1922008-02-17 13:22:51 +0100422static struct notifier_block coretemp_cpu_notifier __refdata = {
Rudolf Marekbebe4672007-05-08 17:22:02 +0200423 .notifier_call = coretemp_cpu_callback,
424};
425#endif /* !CONFIG_HOTPLUG_CPU */
426
427static int __init coretemp_init(void)
428{
429 int i, err = -ENODEV;
430 struct pdev_entry *p, *n;
431
Rudolf Marekbebe4672007-05-08 17:22:02 +0200432 /* quick check if we run Intel */
Mike Travis92cb7612007-10-19 20:35:04 +0200433 if (cpu_data(0).x86_vendor != X86_VENDOR_INTEL)
Rudolf Marekbebe4672007-05-08 17:22:02 +0200434 goto exit;
435
436 err = platform_driver_register(&coretemp_driver);
437 if (err)
438 goto exit;
439
440 for_each_online_cpu(i) {
Mike Travis92cb7612007-10-19 20:35:04 +0200441 struct cpuinfo_x86 *c = &cpu_data(i);
Rudolf Marekbebe4672007-05-08 17:22:02 +0200442
Rudolf Marekeccfed42009-09-23 22:59:42 +0200443 /* check if family 6, models 0xe (Pentium M DC),
444 0xf (Core 2 DC 65nm), 0x16 (Core 2 SC 65nm),
Huaxu Wanfa08acd2009-09-23 22:59:43 +0200445 0x17 (Penryn 45nm), 0x1a (Nehalem), 0x1c (Atom),
446 0x1e (Lynnfield) */
Rudolf Marekbebe4672007-05-08 17:22:02 +0200447 if ((c->cpuid_level < 0) || (c->x86 != 0x6) ||
Rudolf Marekc9403362007-10-07 13:42:09 +0200448 !((c->x86_model == 0xe) || (c->x86_model == 0xf) ||
Darrick J. Wong34c86c12008-08-15 00:40:41 -0700449 (c->x86_model == 0x16) || (c->x86_model == 0x17) ||
Huaxu Wanfa08acd2009-09-23 22:59:43 +0200450 (c->x86_model == 0x1a) || (c->x86_model == 0x1c) ||
451 (c->x86_model == 0x1e))) {
Rudolf Marekbebe4672007-05-08 17:22:02 +0200452
453 /* supported CPU not found, but report the unknown
454 family 6 CPU */
455 if ((c->x86 == 0x6) && (c->x86_model > 0xf))
456 printk(KERN_WARNING DRVNAME ": Unknown CPU "
457 "model %x\n", c->x86_model);
458 continue;
459 }
460
461 err = coretemp_device_add(i);
462 if (err)
463 goto exit_devices_unreg;
464 }
465 if (list_empty(&pdev_list)) {
466 err = -ENODEV;
467 goto exit_driver_unreg;
468 }
469
470#ifdef CONFIG_HOTPLUG_CPU
471 register_hotcpu_notifier(&coretemp_cpu_notifier);
472#endif
473 return 0;
474
475exit_devices_unreg:
476 mutex_lock(&pdev_list_mutex);
477 list_for_each_entry_safe(p, n, &pdev_list, list) {
478 platform_device_unregister(p->pdev);
479 list_del(&p->list);
480 kfree(p);
481 }
482 mutex_unlock(&pdev_list_mutex);
483exit_driver_unreg:
484 platform_driver_unregister(&coretemp_driver);
485exit:
486 return err;
487}
488
489static void __exit coretemp_exit(void)
490{
491 struct pdev_entry *p, *n;
492#ifdef CONFIG_HOTPLUG_CPU
493 unregister_hotcpu_notifier(&coretemp_cpu_notifier);
494#endif
495 mutex_lock(&pdev_list_mutex);
496 list_for_each_entry_safe(p, n, &pdev_list, list) {
497 platform_device_unregister(p->pdev);
498 list_del(&p->list);
499 kfree(p);
500 }
501 mutex_unlock(&pdev_list_mutex);
502 platform_driver_unregister(&coretemp_driver);
503}
504
505MODULE_AUTHOR("Rudolf Marek <r.marek@assembler.cz>");
506MODULE_DESCRIPTION("Intel Core temperature monitor");
507MODULE_LICENSE("GPL");
508
509module_init(coretemp_init)
510module_exit(coretemp_exit)