blob: 9425098928957350abda4a9bdf280a819fee15eb [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
Joe Perchesf8bb8922010-10-20 06:51:31 +000023#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
24
Rudolf Marekbebe4672007-05-08 17:22:02 +020025#include <linux/module.h>
Rudolf Marekbebe4672007-05-08 17:22:02 +020026#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>
Guenter Roeck4cc45272011-05-19 14:45:48 -070037#include <linux/smp.h>
Jean Delvarea45a8c82011-09-16 21:24:02 +020038#include <linux/moduleparam.h>
Rudolf Marekbebe4672007-05-08 17:22:02 +020039#include <asm/msr.h>
40#include <asm/processor.h>
Andi Kleen9b380962012-01-26 00:09:10 +010041#include <asm/cpu_device_id.h>
Rudolf Marekbebe4672007-05-08 17:22:02 +020042
43#define DRVNAME "coretemp"
44
Jean Delvarea45a8c82011-09-16 21:24:02 +020045/*
46 * force_tjmax only matters when TjMax can't be read from the CPU itself.
47 * When set, it replaces the driver's suboptimal heuristic.
48 */
49static int force_tjmax;
50module_param_named(tjmax, force_tjmax, int, 0444);
51MODULE_PARM_DESC(tjmax, "TjMax value in degrees Celsius");
52
Durgadoss R199e0de2011-05-20 01:29:35 +053053#define BASE_SYSFS_ATTR_NO 2 /* Sysfs Base attr no for coretemp */
Guenter Roeckbdc71c92012-05-01 08:15:42 -070054#define NUM_REAL_CORES 32 /* Number of Real cores per cpu */
Jean Delvare3f9aec72014-01-14 15:59:55 +010055#define CORETEMP_NAME_LENGTH 19 /* String Length of attrs */
Durgadoss Rc814a4c2011-07-12 07:07:16 -040056#define MAX_CORE_ATTRS 4 /* Maximum no of basic attrs */
Guenter Roeckf4af6fd2011-09-19 21:41:16 -070057#define TOTAL_ATTRS (MAX_CORE_ATTRS + 1)
Durgadoss R199e0de2011-05-20 01:29:35 +053058#define MAX_CORE_DATA (NUM_REAL_CORES + BASE_SYSFS_ATTR_NO)
59
Guenter Roeck780affe2012-01-20 09:31:17 -080060#define TO_PHYS_ID(cpu) (cpu_data(cpu).phys_proc_id)
61#define TO_CORE_ID(cpu) (cpu_data(cpu).cpu_core_id)
Kevin Winchester141168c2011-12-20 20:52:22 -040062#define TO_ATTR_NO(cpu) (TO_CORE_ID(cpu) + BASE_SYSFS_ATTR_NO)
63
64#ifdef CONFIG_SMP
Guenter Roeckbb74e8c2011-05-23 12:06:41 -070065#define for_each_sibling(i, cpu) for_each_cpu(i, cpu_sibling_mask(cpu))
Durgadoss R199e0de2011-05-20 01:29:35 +053066#else
Guenter Roeckbb74e8c2011-05-23 12:06:41 -070067#define for_each_sibling(i, cpu) for (i = 0; false; )
Durgadoss R199e0de2011-05-20 01:29:35 +053068#endif
Rudolf Marekbebe4672007-05-08 17:22:02 +020069
70/*
Durgadoss R199e0de2011-05-20 01:29:35 +053071 * Per-Core Temperature Data
72 * @last_updated: The time when the current temperature value was updated
73 * earlier (in jiffies).
74 * @cpu_core_id: The CPU Core from which temperature values should be read
75 * This value is passed as "id" field to rdmsr/wrmsr functions.
76 * @status_reg: One of IA32_THERM_STATUS or IA32_PACKAGE_THERM_STATUS,
77 * from where the temperature values should be read.
Durgadoss Rc814a4c2011-07-12 07:07:16 -040078 * @attr_size: Total number of pre-core attrs displayed in the sysfs.
Durgadoss R199e0de2011-05-20 01:29:35 +053079 * @is_pkg_data: If this is 1, the temp_data holds pkgtemp data.
80 * Otherwise, temp_data holds coretemp data.
81 * @valid: If this is 1, the current temperature is valid.
Rudolf Marekbebe4672007-05-08 17:22:02 +020082 */
Durgadoss R199e0de2011-05-20 01:29:35 +053083struct temp_data {
Rudolf Marekbebe4672007-05-08 17:22:02 +020084 int temp;
Rudolf Marek6369a2882008-01-18 00:42:54 +010085 int ttarget;
Durgadoss R199e0de2011-05-20 01:29:35 +053086 int tjmax;
87 unsigned long last_updated;
88 unsigned int cpu;
89 u32 cpu_core_id;
90 u32 status_reg;
Durgadoss Rc814a4c2011-07-12 07:07:16 -040091 int attr_size;
Durgadoss R199e0de2011-05-20 01:29:35 +053092 bool is_pkg_data;
93 bool valid;
Durgadoss Rc814a4c2011-07-12 07:07:16 -040094 struct sensor_device_attribute sd_attrs[TOTAL_ATTRS];
95 char attr_name[TOTAL_ATTRS][CORETEMP_NAME_LENGTH];
Durgadoss R199e0de2011-05-20 01:29:35 +053096 struct mutex update_lock;
Rudolf Marekbebe4672007-05-08 17:22:02 +020097};
98
Durgadoss R199e0de2011-05-20 01:29:35 +053099/* Platform Data per Physical CPU */
100struct platform_data {
101 struct device *hwmon_dev;
102 u16 phys_proc_id;
103 struct temp_data *core_data[MAX_CORE_DATA];
104 struct device_attribute name_attr;
105};
Rudolf Marekbebe4672007-05-08 17:22:02 +0200106
Durgadoss R199e0de2011-05-20 01:29:35 +0530107struct pdev_entry {
108 struct list_head list;
109 struct platform_device *pdev;
Durgadoss R199e0de2011-05-20 01:29:35 +0530110 u16 phys_proc_id;
Durgadoss R199e0de2011-05-20 01:29:35 +0530111};
112
113static LIST_HEAD(pdev_list);
114static DEFINE_MUTEX(pdev_list_mutex);
115
116static ssize_t show_name(struct device *dev,
117 struct device_attribute *devattr, char *buf)
Rudolf Marekbebe4672007-05-08 17:22:02 +0200118{
Durgadoss R199e0de2011-05-20 01:29:35 +0530119 return sprintf(buf, "%s\n", DRVNAME);
Rudolf Marekbebe4672007-05-08 17:22:02 +0200120}
121
Durgadoss R199e0de2011-05-20 01:29:35 +0530122static ssize_t show_label(struct device *dev,
123 struct device_attribute *devattr, char *buf)
Rudolf Marekbebe4672007-05-08 17:22:02 +0200124{
Durgadoss R199e0de2011-05-20 01:29:35 +0530125 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
126 struct platform_data *pdata = dev_get_drvdata(dev);
127 struct temp_data *tdata = pdata->core_data[attr->index];
128
129 if (tdata->is_pkg_data)
130 return sprintf(buf, "Physical id %u\n", pdata->phys_proc_id);
131
132 return sprintf(buf, "Core %u\n", tdata->cpu_core_id);
133}
134
135static ssize_t show_crit_alarm(struct device *dev,
136 struct device_attribute *devattr, char *buf)
137{
138 u32 eax, edx;
139 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
140 struct platform_data *pdata = dev_get_drvdata(dev);
141 struct temp_data *tdata = pdata->core_data[attr->index];
142
143 rdmsr_on_cpu(tdata->cpu, tdata->status_reg, &eax, &edx);
144
145 return sprintf(buf, "%d\n", (eax >> 5) & 1);
146}
147
148static ssize_t show_tjmax(struct device *dev,
149 struct device_attribute *devattr, char *buf)
150{
151 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
152 struct platform_data *pdata = dev_get_drvdata(dev);
153
154 return sprintf(buf, "%d\n", pdata->core_data[attr->index]->tjmax);
155}
156
157static ssize_t show_ttarget(struct device *dev,
158 struct device_attribute *devattr, char *buf)
159{
160 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
161 struct platform_data *pdata = dev_get_drvdata(dev);
162
163 return sprintf(buf, "%d\n", pdata->core_data[attr->index]->ttarget);
Rudolf Marekbebe4672007-05-08 17:22:02 +0200164}
165
166static ssize_t show_temp(struct device *dev,
Durgadoss R199e0de2011-05-20 01:29:35 +0530167 struct device_attribute *devattr, char *buf)
Rudolf Marekbebe4672007-05-08 17:22:02 +0200168{
Durgadoss R199e0de2011-05-20 01:29:35 +0530169 u32 eax, edx;
Rudolf Marekbebe4672007-05-08 17:22:02 +0200170 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
Durgadoss R199e0de2011-05-20 01:29:35 +0530171 struct platform_data *pdata = dev_get_drvdata(dev);
172 struct temp_data *tdata = pdata->core_data[attr->index];
Rudolf Marekbebe4672007-05-08 17:22:02 +0200173
Durgadoss R199e0de2011-05-20 01:29:35 +0530174 mutex_lock(&tdata->update_lock);
Rudolf Marekbebe4672007-05-08 17:22:02 +0200175
Durgadoss R199e0de2011-05-20 01:29:35 +0530176 /* Check whether the time interval has elapsed */
177 if (!tdata->valid || time_after(jiffies, tdata->last_updated + HZ)) {
178 rdmsr_on_cpu(tdata->cpu, tdata->status_reg, &eax, &edx);
179 tdata->valid = 0;
180 /* Check whether the data is valid */
Rudolf Marekbebe4672007-05-08 17:22:02 +0200181 if (eax & 0x80000000) {
Durgadoss R199e0de2011-05-20 01:29:35 +0530182 tdata->temp = tdata->tjmax -
Guenter Roeck4cc45272011-05-19 14:45:48 -0700183 ((eax >> 16) & 0x7f) * 1000;
Durgadoss R199e0de2011-05-20 01:29:35 +0530184 tdata->valid = 1;
Rudolf Marekbebe4672007-05-08 17:22:02 +0200185 }
Durgadoss R199e0de2011-05-20 01:29:35 +0530186 tdata->last_updated = jiffies;
Rudolf Marekbebe4672007-05-08 17:22:02 +0200187 }
188
Durgadoss R199e0de2011-05-20 01:29:35 +0530189 mutex_unlock(&tdata->update_lock);
190 return tdata->valid ? sprintf(buf, "%d\n", tdata->temp) : -EAGAIN;
Rudolf Marekbebe4672007-05-08 17:22:02 +0200191}
192
Guenter Roeck41e58a1f2012-06-17 18:05:05 +0200193struct tjmax {
194 char const *id;
195 int tjmax;
196};
197
Paul Gortmakerd23e2ae2013-06-19 14:02:20 -0400198static const struct tjmax tjmax_table[] = {
Guenter Roeck1102dca2012-10-09 13:23:57 -0700199 { "CPU 230", 100000 }, /* Model 0x1c, stepping 2 */
200 { "CPU 330", 125000 }, /* Model 0x1c, stepping 2 */
Guenter Roeck9e3970f2012-11-16 21:55:24 -0800201 { "CPU CE4110", 110000 }, /* Model 0x1c, stepping 10 Sodaville */
Guenter Roeck1102dca2012-10-09 13:23:57 -0700202 { "CPU CE4150", 110000 }, /* Model 0x1c, stepping 10 */
203 { "CPU CE4170", 110000 }, /* Model 0x1c, stepping 10 */
Guenter Roeck41e58a1f2012-06-17 18:05:05 +0200204};
205
Guenter Roeck2fa52222012-10-09 12:45:23 -0700206struct tjmax_model {
207 u8 model;
208 u8 mask;
209 int tjmax;
210};
211
212#define ANY 0xff
213
Paul Gortmakerd23e2ae2013-06-19 14:02:20 -0400214static const struct tjmax_model tjmax_model_table[] = {
Guenter Roeck9e3970f2012-11-16 21:55:24 -0800215 { 0x1c, 10, 100000 }, /* D4xx, K4xx, N4xx, D5xx, K5xx, N5xx */
Guenter Roeck2fa52222012-10-09 12:45:23 -0700216 { 0x1c, ANY, 90000 }, /* Z5xx, N2xx, possibly others
217 * Note: Also matches 230 and 330,
218 * which are covered by tjmax_table
219 */
220 { 0x26, ANY, 90000 }, /* Atom Tunnel Creek (Exx), Lincroft (Z6xx)
221 * Note: TjMax for E6xxT is 110C, but CPU type
222 * is undetectable by software
223 */
224 { 0x27, ANY, 90000 }, /* Atom Medfield (Z2460) */
Guenter Roeck9e3970f2012-11-16 21:55:24 -0800225 { 0x35, ANY, 90000 }, /* Atom Clover Trail/Cloverview (Z2760) */
Guenter Roeck2fa52222012-10-09 12:45:23 -0700226 { 0x36, ANY, 100000 }, /* Atom Cedar Trail/Cedarview (N2xxx, D2xxx) */
227};
228
Paul Gortmakerd23e2ae2013-06-19 14:02:20 -0400229static int adjust_tjmax(struct cpuinfo_x86 *c, u32 id, struct device *dev)
Rudolf Marek118a8872008-02-17 22:59:39 +0100230{
231 /* The 100C is default for both mobile and non mobile CPUs */
232
233 int tjmax = 100000;
Rudolf Marekeccfed42009-09-23 22:59:42 +0200234 int tjmax_ee = 85000;
Rudolf Marek708a62b2009-09-23 22:59:42 +0200235 int usemsr_ee = 1;
Rudolf Marek118a8872008-02-17 22:59:39 +0100236 int err;
237 u32 eax, edx;
Guenter Roeck41e58a1f2012-06-17 18:05:05 +0200238 int i;
239
240 /* explicit tjmax table entries override heuristics */
241 for (i = 0; i < ARRAY_SIZE(tjmax_table); i++) {
242 if (strstr(c->x86_model_id, tjmax_table[i].id))
243 return tjmax_table[i].tjmax;
244 }
Rudolf Marek118a8872008-02-17 22:59:39 +0100245
Guenter Roeck2fa52222012-10-09 12:45:23 -0700246 for (i = 0; i < ARRAY_SIZE(tjmax_model_table); i++) {
247 const struct tjmax_model *tm = &tjmax_model_table[i];
248 if (c->x86_model == tm->model &&
249 (tm->mask == ANY || c->x86_mask == tm->mask))
250 return tm->tjmax;
Guenter Roeck72cbddd2012-10-09 12:27:12 -0700251 }
252
Rudolf Marek118a8872008-02-17 22:59:39 +0100253 /* Early chips have no MSR for TjMax */
254
Guenter Roeck4cc45272011-05-19 14:45:48 -0700255 if (c->x86_model == 0xf && c->x86_mask < 4)
Rudolf Marek708a62b2009-09-23 22:59:42 +0200256 usemsr_ee = 0;
Rudolf Marek118a8872008-02-17 22:59:39 +0100257
Guenter Roeck4cc45272011-05-19 14:45:48 -0700258 if (c->x86_model > 0xe && usemsr_ee) {
Rudolf Marekeccfed42009-09-23 22:59:42 +0200259 u8 platform_id;
Rudolf Marek118a8872008-02-17 22:59:39 +0100260
Guenter Roeck4cc45272011-05-19 14:45:48 -0700261 /*
262 * Now we can detect the mobile CPU using Intel provided table
263 * http://softwarecommunity.intel.com/Wiki/Mobility/720.htm
264 * For Core2 cores, check MSR 0x17, bit 28 1 = Mobile CPU
265 */
Rudolf Marek118a8872008-02-17 22:59:39 +0100266 err = rdmsr_safe_on_cpu(id, 0x17, &eax, &edx);
267 if (err) {
268 dev_warn(dev,
269 "Unable to access MSR 0x17, assuming desktop"
270 " CPU\n");
Rudolf Marek708a62b2009-09-23 22:59:42 +0200271 usemsr_ee = 0;
Rudolf Marekeccfed42009-09-23 22:59:42 +0200272 } else if (c->x86_model < 0x17 && !(eax & 0x10000000)) {
Guenter Roeck4cc45272011-05-19 14:45:48 -0700273 /*
274 * Trust bit 28 up to Penryn, I could not find any
275 * documentation on that; if you happen to know
276 * someone at Intel please ask
277 */
Rudolf Marek708a62b2009-09-23 22:59:42 +0200278 usemsr_ee = 0;
Rudolf Marekeccfed42009-09-23 22:59:42 +0200279 } else {
280 /* Platform ID bits 52:50 (EDX starts at bit 32) */
281 platform_id = (edx >> 18) & 0x7;
282
Guenter Roeck4cc45272011-05-19 14:45:48 -0700283 /*
284 * Mobile Penryn CPU seems to be platform ID 7 or 5
285 * (guesswork)
286 */
287 if (c->x86_model == 0x17 &&
288 (platform_id == 5 || platform_id == 7)) {
289 /*
290 * If MSR EE bit is set, set it to 90 degrees C,
291 * otherwise 105 degrees C
292 */
Rudolf Marekeccfed42009-09-23 22:59:42 +0200293 tjmax_ee = 90000;
294 tjmax = 105000;
295 }
Rudolf Marek118a8872008-02-17 22:59:39 +0100296 }
297 }
298
Rudolf Marek708a62b2009-09-23 22:59:42 +0200299 if (usemsr_ee) {
Rudolf Marek118a8872008-02-17 22:59:39 +0100300 err = rdmsr_safe_on_cpu(id, 0xee, &eax, &edx);
301 if (err) {
302 dev_warn(dev,
303 "Unable to access MSR 0xEE, for Tjmax, left"
Dean Nelson4d7a5642010-03-29 22:03:00 +0200304 " at default\n");
Rudolf Marek118a8872008-02-17 22:59:39 +0100305 } else if (eax & 0x40000000) {
Rudolf Marekeccfed42009-09-23 22:59:42 +0200306 tjmax = tjmax_ee;
Rudolf Marek118a8872008-02-17 22:59:39 +0100307 }
Rudolf Marek708a62b2009-09-23 22:59:42 +0200308 } else if (tjmax == 100000) {
Guenter Roeck4cc45272011-05-19 14:45:48 -0700309 /*
310 * If we don't use msr EE it means we are desktop CPU
311 * (with exeception of Atom)
312 */
Rudolf Marek118a8872008-02-17 22:59:39 +0100313 dev_warn(dev, "Using relative temperature scale!\n");
314 }
315
316 return tjmax;
317}
318
Guenter Roeck1c2faa22013-05-27 14:12:15 -0700319static bool cpu_has_tjmax(struct cpuinfo_x86 *c)
320{
321 u8 model = c->x86_model;
322
323 return model > 0xe &&
324 model != 0x1c &&
325 model != 0x26 &&
326 model != 0x27 &&
327 model != 0x35 &&
328 model != 0x36;
329}
330
Paul Gortmakerd23e2ae2013-06-19 14:02:20 -0400331static int get_tjmax(struct cpuinfo_x86 *c, u32 id, struct device *dev)
Carsten Emdea321ced2010-05-24 14:33:41 -0700332{
Carsten Emdea321ced2010-05-24 14:33:41 -0700333 int err;
334 u32 eax, edx;
335 u32 val;
336
Guenter Roeck4cc45272011-05-19 14:45:48 -0700337 /*
338 * A new feature of current Intel(R) processors, the
339 * IA32_TEMPERATURE_TARGET contains the TjMax value
340 */
Carsten Emdea321ced2010-05-24 14:33:41 -0700341 err = rdmsr_safe_on_cpu(id, MSR_IA32_TEMPERATURE_TARGET, &eax, &edx);
342 if (err) {
Guenter Roeck1c2faa22013-05-27 14:12:15 -0700343 if (cpu_has_tjmax(c))
Jean Delvare6bf9e9b2011-09-16 21:21:43 +0200344 dev_warn(dev, "Unable to read TjMax from CPU %u\n", id);
Carsten Emdea321ced2010-05-24 14:33:41 -0700345 } else {
346 val = (eax >> 16) & 0xff;
347 /*
348 * If the TjMax is not plausible, an assumption
349 * will be used
350 */
Guenter Roeckbb9973e2011-06-01 11:03:41 -0700351 if (val) {
Jean Delvare6bf9e9b2011-09-16 21:21:43 +0200352 dev_dbg(dev, "TjMax is %d degrees C\n", val);
Carsten Emdea321ced2010-05-24 14:33:41 -0700353 return val * 1000;
354 }
355 }
356
Jean Delvarea45a8c82011-09-16 21:24:02 +0200357 if (force_tjmax) {
358 dev_notice(dev, "TjMax forced to %d degrees C by user\n",
359 force_tjmax);
360 return force_tjmax * 1000;
361 }
362
Carsten Emdea321ced2010-05-24 14:33:41 -0700363 /*
364 * An assumption is made for early CPUs and unreadable MSR.
Guenter Roeck4f5f71a2011-05-31 06:54:21 -0700365 * NOTE: the calculated value may not be correct.
Carsten Emdea321ced2010-05-24 14:33:41 -0700366 */
Guenter Roeck4f5f71a2011-05-31 06:54:21 -0700367 return adjust_tjmax(c, id, dev);
Carsten Emdea321ced2010-05-24 14:33:41 -0700368}
369
Bill Pemberton6c931ae2012-11-19 13:22:35 -0500370static int create_name_attr(struct platform_data *pdata,
Jean Delvared6db23c2012-01-16 22:51:47 +0100371 struct device *dev)
Durgadoss R199e0de2011-05-20 01:29:35 +0530372{
Sergey Senozhatsky42587812011-05-24 07:28:31 -0400373 sysfs_attr_init(&pdata->name_attr.attr);
Durgadoss R199e0de2011-05-20 01:29:35 +0530374 pdata->name_attr.attr.name = "name";
375 pdata->name_attr.attr.mode = S_IRUGO;
376 pdata->name_attr.show = show_name;
377 return device_create_file(dev, &pdata->name_attr);
378}
379
Paul Gortmakerd23e2ae2013-06-19 14:02:20 -0400380static int create_core_attrs(struct temp_data *tdata, struct device *dev,
381 int attr_no)
Durgadoss R199e0de2011-05-20 01:29:35 +0530382{
383 int err, i;
Jan Beuliche3204ed2011-09-23 06:36:53 -0400384 static ssize_t (*const rd_ptr[TOTAL_ATTRS]) (struct device *dev,
Durgadoss R199e0de2011-05-20 01:29:35 +0530385 struct device_attribute *devattr, char *buf) = {
Durgadoss Rc814a4c2011-07-12 07:07:16 -0400386 show_label, show_crit_alarm, show_temp, show_tjmax,
Guenter Roeckf4af6fd2011-09-19 21:41:16 -0700387 show_ttarget };
Jan Beuliche3204ed2011-09-23 06:36:53 -0400388 static const char *const names[TOTAL_ATTRS] = {
Durgadoss R199e0de2011-05-20 01:29:35 +0530389 "temp%d_label", "temp%d_crit_alarm",
Durgadoss Rc814a4c2011-07-12 07:07:16 -0400390 "temp%d_input", "temp%d_crit",
Guenter Roeckf4af6fd2011-09-19 21:41:16 -0700391 "temp%d_max" };
Durgadoss R199e0de2011-05-20 01:29:35 +0530392
Durgadoss Rc814a4c2011-07-12 07:07:16 -0400393 for (i = 0; i < tdata->attr_size; i++) {
Durgadoss R199e0de2011-05-20 01:29:35 +0530394 snprintf(tdata->attr_name[i], CORETEMP_NAME_LENGTH, names[i],
395 attr_no);
Sergey Senozhatsky42587812011-05-24 07:28:31 -0400396 sysfs_attr_init(&tdata->sd_attrs[i].dev_attr.attr);
Durgadoss R199e0de2011-05-20 01:29:35 +0530397 tdata->sd_attrs[i].dev_attr.attr.name = tdata->attr_name[i];
398 tdata->sd_attrs[i].dev_attr.attr.mode = S_IRUGO;
399 tdata->sd_attrs[i].dev_attr.show = rd_ptr[i];
Durgadoss R199e0de2011-05-20 01:29:35 +0530400 tdata->sd_attrs[i].index = attr_no;
401 err = device_create_file(dev, &tdata->sd_attrs[i].dev_attr);
402 if (err)
403 goto exit_free;
404 }
405 return 0;
406
407exit_free:
408 while (--i >= 0)
409 device_remove_file(dev, &tdata->sd_attrs[i].dev_attr);
410 return err;
411}
412
Rudolf Marekbebe4672007-05-08 17:22:02 +0200413
Paul Gortmakerd23e2ae2013-06-19 14:02:20 -0400414static int chk_ucode_version(unsigned int cpu)
Durgadoss R199e0de2011-05-20 01:29:35 +0530415{
Jean Delvare0eb97822011-09-28 08:11:00 -0700416 struct cpuinfo_x86 *c = &cpu_data(cpu);
Rudolf Marekbebe4672007-05-08 17:22:02 +0200417
Durgadoss R199e0de2011-05-20 01:29:35 +0530418 /*
419 * Check if we have problem with errata AE18 of Core processors:
420 * Readings might stop update when processor visited too deep sleep,
421 * fixed for stepping D0 (6EC).
422 */
Andi Kleenca8bc8d2011-10-12 17:46:35 -0700423 if (c->x86_model == 0xe && c->x86_mask < 0xc && c->microcode < 0x39) {
Guenter Roeckb55f3752013-01-10 10:01:24 -0800424 pr_err("Errata AE18 not fixed, update BIOS or microcode of the CPU!\n");
Andi Kleenca8bc8d2011-10-12 17:46:35 -0700425 return -ENODEV;
Rudolf Marek67f363b2007-05-27 22:17:43 +0200426 }
Durgadoss R199e0de2011-05-20 01:29:35 +0530427 return 0;
428}
Rudolf Marek67f363b2007-05-27 22:17:43 +0200429
Paul Gortmakerd23e2ae2013-06-19 14:02:20 -0400430static struct platform_device *coretemp_get_pdev(unsigned int cpu)
Durgadoss R199e0de2011-05-20 01:29:35 +0530431{
432 u16 phys_proc_id = TO_PHYS_ID(cpu);
433 struct pdev_entry *p;
434
435 mutex_lock(&pdev_list_mutex);
436
437 list_for_each_entry(p, &pdev_list, list)
438 if (p->phys_proc_id == phys_proc_id) {
439 mutex_unlock(&pdev_list_mutex);
440 return p->pdev;
441 }
442
443 mutex_unlock(&pdev_list_mutex);
444 return NULL;
445}
446
Paul Gortmakerd23e2ae2013-06-19 14:02:20 -0400447static struct temp_data *init_temp_data(unsigned int cpu, int pkg_flag)
Durgadoss R199e0de2011-05-20 01:29:35 +0530448{
449 struct temp_data *tdata;
450
451 tdata = kzalloc(sizeof(struct temp_data), GFP_KERNEL);
452 if (!tdata)
453 return NULL;
454
455 tdata->status_reg = pkg_flag ? MSR_IA32_PACKAGE_THERM_STATUS :
456 MSR_IA32_THERM_STATUS;
457 tdata->is_pkg_data = pkg_flag;
458 tdata->cpu = cpu;
459 tdata->cpu_core_id = TO_CORE_ID(cpu);
Durgadoss Rc814a4c2011-07-12 07:07:16 -0400460 tdata->attr_size = MAX_CORE_ATTRS;
Durgadoss R199e0de2011-05-20 01:29:35 +0530461 mutex_init(&tdata->update_lock);
462 return tdata;
463}
464
Paul Gortmakerd23e2ae2013-06-19 14:02:20 -0400465static int create_core_data(struct platform_device *pdev, unsigned int cpu,
466 int pkg_flag)
Durgadoss R199e0de2011-05-20 01:29:35 +0530467{
468 struct temp_data *tdata;
Jan Beulich2f1c3db2011-09-23 06:40:08 -0400469 struct platform_data *pdata = platform_get_drvdata(pdev);
Durgadoss R199e0de2011-05-20 01:29:35 +0530470 struct cpuinfo_x86 *c = &cpu_data(cpu);
471 u32 eax, edx;
472 int err, attr_no;
Rudolf Marekbebe4672007-05-08 17:22:02 +0200473
Carsten Emdea321ced2010-05-24 14:33:41 -0700474 /*
Durgadoss R199e0de2011-05-20 01:29:35 +0530475 * Find attr number for sysfs:
476 * We map the attr number to core id of the CPU
477 * The attr number is always core id + 2
478 * The Pkgtemp will always show up as temp1_*, if available
Carsten Emdea321ced2010-05-24 14:33:41 -0700479 */
Durgadoss R199e0de2011-05-20 01:29:35 +0530480 attr_no = pkg_flag ? 1 : TO_ATTR_NO(cpu);
Rudolf Marek6369a2882008-01-18 00:42:54 +0100481
Durgadoss R199e0de2011-05-20 01:29:35 +0530482 if (attr_no > MAX_CORE_DATA - 1)
483 return -ERANGE;
Rudolf Marek6369a2882008-01-18 00:42:54 +0100484
Guenter Roeckf4e0bcf2011-05-23 14:05:38 -0700485 /*
486 * Provide a single set of attributes for all HT siblings of a core
487 * to avoid duplicate sensors (the processor ID and core ID of all
Guenter Roeck6777b9e2011-05-23 13:52:35 -0700488 * HT siblings of a core are the same).
489 * Skip if a HT sibling of this core is already registered.
Guenter Roeckf4e0bcf2011-05-23 14:05:38 -0700490 * This is not an error.
491 */
Durgadoss R199e0de2011-05-20 01:29:35 +0530492 if (pdata->core_data[attr_no] != NULL)
493 return 0;
Rudolf Marekbebe4672007-05-08 17:22:02 +0200494
Durgadoss R199e0de2011-05-20 01:29:35 +0530495 tdata = init_temp_data(cpu, pkg_flag);
496 if (!tdata)
497 return -ENOMEM;
498
499 /* Test if we can access the status register */
500 err = rdmsr_safe_on_cpu(cpu, tdata->status_reg, &eax, &edx);
501 if (err)
502 goto exit_free;
503
504 /* We can access status register. Get Critical Temperature */
Jean Delvare6bf9e9b2011-09-16 21:21:43 +0200505 tdata->tjmax = get_tjmax(c, cpu, &pdev->dev);
Durgadoss R199e0de2011-05-20 01:29:35 +0530506
Durgadoss Rc814a4c2011-07-12 07:07:16 -0400507 /*
Guenter Roeckf4af6fd2011-09-19 21:41:16 -0700508 * Read the still undocumented bits 8:15 of IA32_TEMPERATURE_TARGET.
509 * The target temperature is available on older CPUs but not in this
510 * register. Atoms don't have the register at all.
Durgadoss Rc814a4c2011-07-12 07:07:16 -0400511 */
Guenter Roeckf4af6fd2011-09-19 21:41:16 -0700512 if (c->x86_model > 0xe && c->x86_model != 0x1c) {
513 err = rdmsr_safe_on_cpu(cpu, MSR_IA32_TEMPERATURE_TARGET,
514 &eax, &edx);
515 if (!err) {
516 tdata->ttarget
517 = tdata->tjmax - ((eax >> 8) & 0xff) * 1000;
518 tdata->attr_size++;
519 }
Durgadoss Rc814a4c2011-07-12 07:07:16 -0400520 }
521
Durgadoss R199e0de2011-05-20 01:29:35 +0530522 pdata->core_data[attr_no] = tdata;
523
524 /* Create sysfs interfaces */
525 err = create_core_attrs(tdata, &pdev->dev, attr_no);
526 if (err)
527 goto exit_free;
Rudolf Marekbebe4672007-05-08 17:22:02 +0200528
529 return 0;
Rudolf Marekbebe4672007-05-08 17:22:02 +0200530exit_free:
Guenter Roeck20ecb492011-09-24 15:27:04 -0700531 pdata->core_data[attr_no] = NULL;
Durgadoss R199e0de2011-05-20 01:29:35 +0530532 kfree(tdata);
533 return err;
534}
535
Paul Gortmakerd23e2ae2013-06-19 14:02:20 -0400536static void coretemp_add_core(unsigned int cpu, int pkg_flag)
Durgadoss R199e0de2011-05-20 01:29:35 +0530537{
Durgadoss R199e0de2011-05-20 01:29:35 +0530538 struct platform_device *pdev = coretemp_get_pdev(cpu);
539 int err;
540
541 if (!pdev)
542 return;
543
Jan Beulich2f1c3db2011-09-23 06:40:08 -0400544 err = create_core_data(pdev, cpu, pkg_flag);
Durgadoss R199e0de2011-05-20 01:29:35 +0530545 if (err)
546 dev_err(&pdev->dev, "Adding Core %u failed\n", cpu);
547}
548
549static void coretemp_remove_core(struct platform_data *pdata,
550 struct device *dev, int indx)
551{
552 int i;
553 struct temp_data *tdata = pdata->core_data[indx];
554
555 /* Remove the sysfs attributes */
Durgadoss Rc814a4c2011-07-12 07:07:16 -0400556 for (i = 0; i < tdata->attr_size; i++)
Durgadoss R199e0de2011-05-20 01:29:35 +0530557 device_remove_file(dev, &tdata->sd_attrs[i].dev_attr);
558
559 kfree(pdata->core_data[indx]);
560 pdata->core_data[indx] = NULL;
561}
562
Bill Pemberton6c931ae2012-11-19 13:22:35 -0500563static int coretemp_probe(struct platform_device *pdev)
Durgadoss R199e0de2011-05-20 01:29:35 +0530564{
565 struct platform_data *pdata;
566 int err;
567
Durgadoss R199e0de2011-05-20 01:29:35 +0530568 /* Initialize the per-package data structures */
569 pdata = kzalloc(sizeof(struct platform_data), GFP_KERNEL);
570 if (!pdata)
571 return -ENOMEM;
572
573 err = create_name_attr(pdata, &pdev->dev);
574 if (err)
575 goto exit_free;
576
Jan Beulichb3a242a2011-09-23 06:35:00 -0400577 pdata->phys_proc_id = pdev->id;
Durgadoss R199e0de2011-05-20 01:29:35 +0530578 platform_set_drvdata(pdev, pdata);
579
580 pdata->hwmon_dev = hwmon_device_register(&pdev->dev);
581 if (IS_ERR(pdata->hwmon_dev)) {
582 err = PTR_ERR(pdata->hwmon_dev);
583 dev_err(&pdev->dev, "Class registration failed (%d)\n", err);
584 goto exit_name;
585 }
586 return 0;
587
588exit_name:
589 device_remove_file(&pdev->dev, &pdata->name_attr);
Durgadoss R199e0de2011-05-20 01:29:35 +0530590exit_free:
591 kfree(pdata);
Rudolf Marekbebe4672007-05-08 17:22:02 +0200592 return err;
593}
594
Bill Pemberton281dfd02012-11-19 13:25:51 -0500595static int coretemp_remove(struct platform_device *pdev)
Rudolf Marekbebe4672007-05-08 17:22:02 +0200596{
Durgadoss R199e0de2011-05-20 01:29:35 +0530597 struct platform_data *pdata = platform_get_drvdata(pdev);
598 int i;
Rudolf Marekbebe4672007-05-08 17:22:02 +0200599
Durgadoss R199e0de2011-05-20 01:29:35 +0530600 for (i = MAX_CORE_DATA - 1; i >= 0; --i)
601 if (pdata->core_data[i])
602 coretemp_remove_core(pdata, &pdev->dev, i);
603
604 device_remove_file(&pdev->dev, &pdata->name_attr);
605 hwmon_device_unregister(pdata->hwmon_dev);
Durgadoss R199e0de2011-05-20 01:29:35 +0530606 kfree(pdata);
Rudolf Marekbebe4672007-05-08 17:22:02 +0200607 return 0;
608}
609
610static struct platform_driver coretemp_driver = {
611 .driver = {
612 .owner = THIS_MODULE,
613 .name = DRVNAME,
614 },
615 .probe = coretemp_probe,
Bill Pemberton9e5e9b72012-11-19 13:21:20 -0500616 .remove = coretemp_remove,
Rudolf Marekbebe4672007-05-08 17:22:02 +0200617};
618
Paul Gortmakerd23e2ae2013-06-19 14:02:20 -0400619static int coretemp_device_add(unsigned int cpu)
Rudolf Marekbebe4672007-05-08 17:22:02 +0200620{
621 int err;
622 struct platform_device *pdev;
623 struct pdev_entry *pdev_entry;
Jean Delvared883b9f2010-07-09 16:22:49 +0200624
625 mutex_lock(&pdev_list_mutex);
626
Jan Beulichb3a242a2011-09-23 06:35:00 -0400627 pdev = platform_device_alloc(DRVNAME, TO_PHYS_ID(cpu));
Rudolf Marekbebe4672007-05-08 17:22:02 +0200628 if (!pdev) {
629 err = -ENOMEM;
Joe Perchesf8bb8922010-10-20 06:51:31 +0000630 pr_err("Device allocation failed\n");
Rudolf Marekbebe4672007-05-08 17:22:02 +0200631 goto exit;
632 }
633
634 pdev_entry = kzalloc(sizeof(struct pdev_entry), GFP_KERNEL);
635 if (!pdev_entry) {
636 err = -ENOMEM;
637 goto exit_device_put;
638 }
639
640 err = platform_device_add(pdev);
641 if (err) {
Joe Perchesf8bb8922010-10-20 06:51:31 +0000642 pr_err("Device addition failed (%d)\n", err);
Rudolf Marekbebe4672007-05-08 17:22:02 +0200643 goto exit_device_free;
644 }
645
646 pdev_entry->pdev = pdev;
Jean Delvare0eb97822011-09-28 08:11:00 -0700647 pdev_entry->phys_proc_id = pdev->id;
Durgadoss R199e0de2011-05-20 01:29:35 +0530648
Rudolf Marekbebe4672007-05-08 17:22:02 +0200649 list_add_tail(&pdev_entry->list, &pdev_list);
650 mutex_unlock(&pdev_list_mutex);
651
652 return 0;
653
654exit_device_free:
655 kfree(pdev_entry);
656exit_device_put:
657 platform_device_put(pdev);
658exit:
Jean Delvared883b9f2010-07-09 16:22:49 +0200659 mutex_unlock(&pdev_list_mutex);
Rudolf Marekbebe4672007-05-08 17:22:02 +0200660 return err;
661}
662
Paul Gortmakerd23e2ae2013-06-19 14:02:20 -0400663static void coretemp_device_remove(unsigned int cpu)
Rudolf Marekbebe4672007-05-08 17:22:02 +0200664{
Durgadoss R199e0de2011-05-20 01:29:35 +0530665 struct pdev_entry *p, *n;
666 u16 phys_proc_id = TO_PHYS_ID(cpu);
Jan Beuliche40cc4b2010-09-13 10:23:05 +0000667
Rudolf Marekbebe4672007-05-08 17:22:02 +0200668 mutex_lock(&pdev_list_mutex);
Durgadoss R199e0de2011-05-20 01:29:35 +0530669 list_for_each_entry_safe(p, n, &pdev_list, list) {
670 if (p->phys_proc_id != phys_proc_id)
Jan Beuliche40cc4b2010-09-13 10:23:05 +0000671 continue;
Jan Beuliche40cc4b2010-09-13 10:23:05 +0000672 platform_device_unregister(p->pdev);
673 list_del(&p->list);
Jan Beuliche40cc4b2010-09-13 10:23:05 +0000674 kfree(p);
Rudolf Marekbebe4672007-05-08 17:22:02 +0200675 }
676 mutex_unlock(&pdev_list_mutex);
677}
678
Paul Gortmakerd23e2ae2013-06-19 14:02:20 -0400679static bool is_any_core_online(struct platform_data *pdata)
Durgadoss R199e0de2011-05-20 01:29:35 +0530680{
681 int i;
682
683 /* Find online cores, except pkgtemp data */
684 for (i = MAX_CORE_DATA - 1; i >= 0; --i) {
685 if (pdata->core_data[i] &&
686 !pdata->core_data[i]->is_pkg_data) {
687 return true;
688 }
689 }
690 return false;
691}
692
Paul Gortmakerd23e2ae2013-06-19 14:02:20 -0400693static void get_core_online(unsigned int cpu)
Durgadoss R199e0de2011-05-20 01:29:35 +0530694{
695 struct cpuinfo_x86 *c = &cpu_data(cpu);
696 struct platform_device *pdev = coretemp_get_pdev(cpu);
697 int err;
698
699 /*
700 * CPUID.06H.EAX[0] indicates whether the CPU has thermal
701 * sensors. We check this bit only, all the early CPUs
702 * without thermal sensors will be filtered out.
703 */
H. Peter Anvin4ad33412012-06-22 10:58:06 -0700704 if (!cpu_has(c, X86_FEATURE_DTHERM))
Durgadoss R199e0de2011-05-20 01:29:35 +0530705 return;
706
707 if (!pdev) {
Jean Delvare0eb97822011-09-28 08:11:00 -0700708 /* Check the microcode version of the CPU */
709 if (chk_ucode_version(cpu))
710 return;
711
Durgadoss R199e0de2011-05-20 01:29:35 +0530712 /*
713 * Alright, we have DTS support.
714 * We are bringing the _first_ core in this pkg
715 * online. So, initialize per-pkg data structures and
716 * then bring this core online.
717 */
718 err = coretemp_device_add(cpu);
719 if (err)
720 return;
721 /*
722 * Check whether pkgtemp support is available.
723 * If so, add interfaces for pkgtemp.
724 */
725 if (cpu_has(c, X86_FEATURE_PTS))
726 coretemp_add_core(cpu, 1);
727 }
728 /*
729 * Physical CPU device already exists.
730 * So, just add interfaces for this core.
731 */
732 coretemp_add_core(cpu, 0);
733}
734
Paul Gortmakerd23e2ae2013-06-19 14:02:20 -0400735static void put_core_offline(unsigned int cpu)
Durgadoss R199e0de2011-05-20 01:29:35 +0530736{
737 int i, indx;
738 struct platform_data *pdata;
739 struct platform_device *pdev = coretemp_get_pdev(cpu);
740
741 /* If the physical CPU device does not exist, just return */
742 if (!pdev)
743 return;
744
745 pdata = platform_get_drvdata(pdev);
746
747 indx = TO_ATTR_NO(cpu);
748
Kirill A. Shutemovb7048712012-04-30 09:18:01 -0400749 /* The core id is too big, just return */
750 if (indx > MAX_CORE_DATA - 1)
751 return;
752
Durgadoss R199e0de2011-05-20 01:29:35 +0530753 if (pdata->core_data[indx] && pdata->core_data[indx]->cpu == cpu)
754 coretemp_remove_core(pdata, &pdev->dev, indx);
755
Guenter Roeckf4e0bcf2011-05-23 14:05:38 -0700756 /*
Guenter Roeck6777b9e2011-05-23 13:52:35 -0700757 * If a HT sibling of a core is taken offline, but another HT sibling
758 * of the same core is still online, register the alternate sibling.
759 * This ensures that exactly one set of attributes is provided as long
760 * as at least one HT sibling of a core is online.
Guenter Roeckf4e0bcf2011-05-23 14:05:38 -0700761 */
Guenter Roeckbb74e8c2011-05-23 12:06:41 -0700762 for_each_sibling(i, cpu) {
Durgadoss R199e0de2011-05-20 01:29:35 +0530763 if (i != cpu) {
764 get_core_online(i);
Guenter Roeckf4e0bcf2011-05-23 14:05:38 -0700765 /*
766 * Display temperature sensor data for one HT sibling
767 * per core only, so abort the loop after one such
768 * sibling has been found.
769 */
Durgadoss R199e0de2011-05-20 01:29:35 +0530770 break;
771 }
772 }
773 /*
774 * If all cores in this pkg are offline, remove the device.
775 * coretemp_device_remove calls unregister_platform_device,
776 * which in turn calls coretemp_remove. This removes the
777 * pkgtemp entry and does other clean ups.
778 */
779 if (!is_any_core_online(pdata))
780 coretemp_device_remove(cpu);
781}
782
Paul Gortmakerd23e2ae2013-06-19 14:02:20 -0400783static int coretemp_cpu_callback(struct notifier_block *nfb,
Rudolf Marekbebe4672007-05-08 17:22:02 +0200784 unsigned long action, void *hcpu)
785{
786 unsigned int cpu = (unsigned long) hcpu;
787
788 switch (action) {
789 case CPU_ONLINE:
Rafael J. Wysocki561d9a92007-12-03 18:01:50 +0100790 case CPU_DOWN_FAILED:
Durgadoss R199e0de2011-05-20 01:29:35 +0530791 get_core_online(cpu);
Rudolf Marekbebe4672007-05-08 17:22:02 +0200792 break;
Rafael J. Wysocki561d9a92007-12-03 18:01:50 +0100793 case CPU_DOWN_PREPARE:
Durgadoss R199e0de2011-05-20 01:29:35 +0530794 put_core_offline(cpu);
Rudolf Marekbebe4672007-05-08 17:22:02 +0200795 break;
796 }
797 return NOTIFY_OK;
798}
799
Sam Ravnborgba7c1922008-02-17 13:22:51 +0100800static struct notifier_block coretemp_cpu_notifier __refdata = {
Rudolf Marekbebe4672007-05-08 17:22:02 +0200801 .notifier_call = coretemp_cpu_callback,
802};
Rudolf Marekbebe4672007-05-08 17:22:02 +0200803
Jan Beuliche273bd92012-07-30 11:33:00 +0200804static const struct x86_cpu_id __initconst coretemp_ids[] = {
H. Peter Anvin4ad33412012-06-22 10:58:06 -0700805 { X86_VENDOR_INTEL, X86_FAMILY_ANY, X86_MODEL_ANY, X86_FEATURE_DTHERM },
Andi Kleen9b380962012-01-26 00:09:10 +0100806 {}
807};
808MODULE_DEVICE_TABLE(x86cpu, coretemp_ids);
809
Rudolf Marekbebe4672007-05-08 17:22:02 +0200810static int __init coretemp_init(void)
811{
Jean Delvare1268a172012-06-17 18:05:06 +0200812 int i, err;
Rudolf Marekbebe4672007-05-08 17:22:02 +0200813
Andi Kleen9b380962012-01-26 00:09:10 +0100814 /*
815 * CPUID.06H.EAX[0] indicates whether the CPU has thermal
816 * sensors. We check this bit only, all the early CPUs
817 * without thermal sensors will be filtered out.
818 */
819 if (!x86_match_cpu(coretemp_ids))
820 return -ENODEV;
Rudolf Marekbebe4672007-05-08 17:22:02 +0200821
822 err = platform_driver_register(&coretemp_driver);
823 if (err)
824 goto exit;
825
Silas Boyd-Wickizer641f1452012-09-23 20:27:32 +0200826 get_online_cpus();
Jan Beulicha4659052010-09-23 22:21:34 -0700827 for_each_online_cpu(i)
Durgadoss R199e0de2011-05-20 01:29:35 +0530828 get_core_online(i);
Jan Beulich89a3fd32010-09-13 10:05:51 +0000829
830#ifndef CONFIG_HOTPLUG_CPU
Rudolf Marekbebe4672007-05-08 17:22:02 +0200831 if (list_empty(&pdev_list)) {
Silas Boyd-Wickizer641f1452012-09-23 20:27:32 +0200832 put_online_cpus();
Rudolf Marekbebe4672007-05-08 17:22:02 +0200833 err = -ENODEV;
834 goto exit_driver_unreg;
835 }
Jan Beulich89a3fd32010-09-13 10:05:51 +0000836#endif
Rudolf Marekbebe4672007-05-08 17:22:02 +0200837
Rudolf Marekbebe4672007-05-08 17:22:02 +0200838 register_hotcpu_notifier(&coretemp_cpu_notifier);
Silas Boyd-Wickizer641f1452012-09-23 20:27:32 +0200839 put_online_cpus();
Rudolf Marekbebe4672007-05-08 17:22:02 +0200840 return 0;
841
Chen Gong0dca94b2010-08-09 17:21:09 -0700842#ifndef CONFIG_HOTPLUG_CPU
Jan Beulich89a3fd32010-09-13 10:05:51 +0000843exit_driver_unreg:
Rudolf Marekbebe4672007-05-08 17:22:02 +0200844 platform_driver_unregister(&coretemp_driver);
Chen Gong0dca94b2010-08-09 17:21:09 -0700845#endif
Rudolf Marekbebe4672007-05-08 17:22:02 +0200846exit:
847 return err;
848}
849
850static void __exit coretemp_exit(void)
851{
852 struct pdev_entry *p, *n;
Chen Gong17c10d62010-10-08 22:01:48 -0400853
Silas Boyd-Wickizer641f1452012-09-23 20:27:32 +0200854 get_online_cpus();
Rudolf Marekbebe4672007-05-08 17:22:02 +0200855 unregister_hotcpu_notifier(&coretemp_cpu_notifier);
Rudolf Marekbebe4672007-05-08 17:22:02 +0200856 mutex_lock(&pdev_list_mutex);
857 list_for_each_entry_safe(p, n, &pdev_list, list) {
858 platform_device_unregister(p->pdev);
859 list_del(&p->list);
860 kfree(p);
861 }
862 mutex_unlock(&pdev_list_mutex);
Silas Boyd-Wickizer641f1452012-09-23 20:27:32 +0200863 put_online_cpus();
Rudolf Marekbebe4672007-05-08 17:22:02 +0200864 platform_driver_unregister(&coretemp_driver);
865}
866
867MODULE_AUTHOR("Rudolf Marek <r.marek@assembler.cz>");
868MODULE_DESCRIPTION("Intel Core temperature monitor");
869MODULE_LICENSE("GPL");
870
871module_init(coretemp_init)
872module_exit(coretemp_exit)