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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>
Guenter Roeck14513ee2013-05-27 12:20:19 -070039#include <linux/pci.h>
Rudolf Marekbebe4672007-05-08 17:22:02 +020040#include <asm/msr.h>
41#include <asm/processor.h>
Andi Kleen9b380962012-01-26 00:09:10 +010042#include <asm/cpu_device_id.h>
Rudolf Marekbebe4672007-05-08 17:22:02 +020043
44#define DRVNAME "coretemp"
45
Jean Delvarea45a8c82011-09-16 21:24:02 +020046/*
47 * force_tjmax only matters when TjMax can't be read from the CPU itself.
48 * When set, it replaces the driver's suboptimal heuristic.
49 */
50static int force_tjmax;
51module_param_named(tjmax, force_tjmax, int, 0444);
52MODULE_PARM_DESC(tjmax, "TjMax value in degrees Celsius");
53
Durgadoss R199e0de2011-05-20 01:29:35 +053054#define BASE_SYSFS_ATTR_NO 2 /* Sysfs Base attr no for coretemp */
Guenter Roeckbdc71c92012-05-01 08:15:42 -070055#define NUM_REAL_CORES 32 /* Number of Real cores per cpu */
Jean Delvare3f9aec72014-01-14 15:59:55 +010056#define CORETEMP_NAME_LENGTH 19 /* String Length of attrs */
Durgadoss Rc814a4c2011-07-12 07:07:16 -040057#define MAX_CORE_ATTRS 4 /* Maximum no of basic attrs */
Guenter Roeckf4af6fd2011-09-19 21:41:16 -070058#define TOTAL_ATTRS (MAX_CORE_ATTRS + 1)
Durgadoss R199e0de2011-05-20 01:29:35 +053059#define MAX_CORE_DATA (NUM_REAL_CORES + BASE_SYSFS_ATTR_NO)
60
Guenter Roeck780affe2012-01-20 09:31:17 -080061#define TO_PHYS_ID(cpu) (cpu_data(cpu).phys_proc_id)
62#define TO_CORE_ID(cpu) (cpu_data(cpu).cpu_core_id)
Kevin Winchester141168c2011-12-20 20:52:22 -040063#define TO_ATTR_NO(cpu) (TO_CORE_ID(cpu) + BASE_SYSFS_ATTR_NO)
64
65#ifdef CONFIG_SMP
Bartosz Golaszewski19a34ee2015-05-26 15:11:30 +020066#define for_each_sibling(i, cpu) \
67 for_each_cpu(i, topology_sibling_cpumask(cpu))
Durgadoss R199e0de2011-05-20 01:29:35 +053068#else
Guenter Roeckbb74e8c2011-05-23 12:06:41 -070069#define for_each_sibling(i, cpu) for (i = 0; false; )
Durgadoss R199e0de2011-05-20 01:29:35 +053070#endif
Rudolf Marekbebe4672007-05-08 17:22:02 +020071
72/*
Durgadoss R199e0de2011-05-20 01:29:35 +053073 * Per-Core Temperature Data
74 * @last_updated: The time when the current temperature value was updated
75 * earlier (in jiffies).
76 * @cpu_core_id: The CPU Core from which temperature values should be read
77 * This value is passed as "id" field to rdmsr/wrmsr functions.
78 * @status_reg: One of IA32_THERM_STATUS or IA32_PACKAGE_THERM_STATUS,
79 * from where the temperature values should be read.
Durgadoss Rc814a4c2011-07-12 07:07:16 -040080 * @attr_size: Total number of pre-core attrs displayed in the sysfs.
Durgadoss R199e0de2011-05-20 01:29:35 +053081 * @is_pkg_data: If this is 1, the temp_data holds pkgtemp data.
82 * Otherwise, temp_data holds coretemp data.
83 * @valid: If this is 1, the current temperature is valid.
Rudolf Marekbebe4672007-05-08 17:22:02 +020084 */
Durgadoss R199e0de2011-05-20 01:29:35 +053085struct temp_data {
Rudolf Marekbebe4672007-05-08 17:22:02 +020086 int temp;
Rudolf Marek6369a2882008-01-18 00:42:54 +010087 int ttarget;
Durgadoss R199e0de2011-05-20 01:29:35 +053088 int tjmax;
89 unsigned long last_updated;
90 unsigned int cpu;
91 u32 cpu_core_id;
92 u32 status_reg;
Durgadoss Rc814a4c2011-07-12 07:07:16 -040093 int attr_size;
Durgadoss R199e0de2011-05-20 01:29:35 +053094 bool is_pkg_data;
95 bool valid;
Durgadoss Rc814a4c2011-07-12 07:07:16 -040096 struct sensor_device_attribute sd_attrs[TOTAL_ATTRS];
97 char attr_name[TOTAL_ATTRS][CORETEMP_NAME_LENGTH];
Guenter Roeck10753052014-02-16 13:23:25 -080098 struct attribute *attrs[TOTAL_ATTRS + 1];
99 struct attribute_group attr_group;
Durgadoss R199e0de2011-05-20 01:29:35 +0530100 struct mutex update_lock;
Rudolf Marekbebe4672007-05-08 17:22:02 +0200101};
102
Durgadoss R199e0de2011-05-20 01:29:35 +0530103/* Platform Data per Physical CPU */
104struct platform_data {
105 struct device *hwmon_dev;
106 u16 phys_proc_id;
107 struct temp_data *core_data[MAX_CORE_DATA];
108 struct device_attribute name_attr;
109};
Rudolf Marekbebe4672007-05-08 17:22:02 +0200110
Durgadoss R199e0de2011-05-20 01:29:35 +0530111struct pdev_entry {
112 struct list_head list;
113 struct platform_device *pdev;
Durgadoss R199e0de2011-05-20 01:29:35 +0530114 u16 phys_proc_id;
Durgadoss R199e0de2011-05-20 01:29:35 +0530115};
116
117static LIST_HEAD(pdev_list);
118static DEFINE_MUTEX(pdev_list_mutex);
119
Durgadoss R199e0de2011-05-20 01:29:35 +0530120static ssize_t show_label(struct device *dev,
121 struct device_attribute *devattr, char *buf)
Rudolf Marekbebe4672007-05-08 17:22:02 +0200122{
Durgadoss R199e0de2011-05-20 01:29:35 +0530123 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
124 struct platform_data *pdata = dev_get_drvdata(dev);
125 struct temp_data *tdata = pdata->core_data[attr->index];
126
127 if (tdata->is_pkg_data)
128 return sprintf(buf, "Physical id %u\n", pdata->phys_proc_id);
129
130 return sprintf(buf, "Core %u\n", tdata->cpu_core_id);
131}
132
133static ssize_t show_crit_alarm(struct device *dev,
134 struct device_attribute *devattr, char *buf)
135{
136 u32 eax, edx;
137 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
138 struct platform_data *pdata = dev_get_drvdata(dev);
139 struct temp_data *tdata = pdata->core_data[attr->index];
140
141 rdmsr_on_cpu(tdata->cpu, tdata->status_reg, &eax, &edx);
142
143 return sprintf(buf, "%d\n", (eax >> 5) & 1);
144}
145
146static ssize_t show_tjmax(struct device *dev,
147 struct device_attribute *devattr, char *buf)
148{
149 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
150 struct platform_data *pdata = dev_get_drvdata(dev);
151
152 return sprintf(buf, "%d\n", pdata->core_data[attr->index]->tjmax);
153}
154
155static ssize_t show_ttarget(struct device *dev,
156 struct device_attribute *devattr, char *buf)
157{
158 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
159 struct platform_data *pdata = dev_get_drvdata(dev);
160
161 return sprintf(buf, "%d\n", pdata->core_data[attr->index]->ttarget);
Rudolf Marekbebe4672007-05-08 17:22:02 +0200162}
163
164static ssize_t show_temp(struct device *dev,
Durgadoss R199e0de2011-05-20 01:29:35 +0530165 struct device_attribute *devattr, char *buf)
Rudolf Marekbebe4672007-05-08 17:22:02 +0200166{
Durgadoss R199e0de2011-05-20 01:29:35 +0530167 u32 eax, edx;
Rudolf Marekbebe4672007-05-08 17:22:02 +0200168 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
Durgadoss R199e0de2011-05-20 01:29:35 +0530169 struct platform_data *pdata = dev_get_drvdata(dev);
170 struct temp_data *tdata = pdata->core_data[attr->index];
Rudolf Marekbebe4672007-05-08 17:22:02 +0200171
Durgadoss R199e0de2011-05-20 01:29:35 +0530172 mutex_lock(&tdata->update_lock);
Rudolf Marekbebe4672007-05-08 17:22:02 +0200173
Durgadoss R199e0de2011-05-20 01:29:35 +0530174 /* Check whether the time interval has elapsed */
175 if (!tdata->valid || time_after(jiffies, tdata->last_updated + HZ)) {
176 rdmsr_on_cpu(tdata->cpu, tdata->status_reg, &eax, &edx);
Guenter Roeckbf6ea082013-11-20 10:25:17 -0800177 /*
178 * Ignore the valid bit. In all observed cases the register
179 * value is either low or zero if the valid bit is 0.
180 * Return it instead of reporting an error which doesn't
181 * really help at all.
182 */
183 tdata->temp = tdata->tjmax - ((eax >> 16) & 0x7f) * 1000;
184 tdata->valid = 1;
Durgadoss R199e0de2011-05-20 01:29:35 +0530185 tdata->last_updated = jiffies;
Rudolf Marekbebe4672007-05-08 17:22:02 +0200186 }
187
Durgadoss R199e0de2011-05-20 01:29:35 +0530188 mutex_unlock(&tdata->update_lock);
Guenter Roeckbf6ea082013-11-20 10:25:17 -0800189 return sprintf(buf, "%d\n", tdata->temp);
Rudolf Marekbebe4672007-05-08 17:22:02 +0200190}
191
Guenter Roeck14513ee2013-05-27 12:20:19 -0700192struct tjmax_pci {
193 unsigned int device;
194 int tjmax;
195};
196
197static const struct tjmax_pci tjmax_pci_table[] = {
Guenter Roeck347c16c2013-05-27 14:17:27 -0700198 { 0x0708, 110000 }, /* CE41x0 (Sodaville ) */
Guenter Roeck14513ee2013-05-27 12:20:19 -0700199 { 0x0c72, 102000 }, /* Atom S1240 (Centerton) */
200 { 0x0c73, 95000 }, /* Atom S1220 (Centerton) */
201 { 0x0c75, 95000 }, /* Atom S1260 (Centerton) */
202};
203
Guenter Roeck41e58a1f2012-06-17 18:05:05 +0200204struct tjmax {
205 char const *id;
206 int tjmax;
207};
208
Paul Gortmakerd23e2ae2013-06-19 14:02:20 -0400209static const struct tjmax tjmax_table[] = {
Guenter Roeck1102dca2012-10-09 13:23:57 -0700210 { "CPU 230", 100000 }, /* Model 0x1c, stepping 2 */
211 { "CPU 330", 125000 }, /* Model 0x1c, stepping 2 */
Guenter Roeck41e58a1f2012-06-17 18:05:05 +0200212};
213
Guenter Roeck2fa52222012-10-09 12:45:23 -0700214struct tjmax_model {
215 u8 model;
216 u8 mask;
217 int tjmax;
218};
219
220#define ANY 0xff
221
Paul Gortmakerd23e2ae2013-06-19 14:02:20 -0400222static const struct tjmax_model tjmax_model_table[] = {
Guenter Roeck9e3970f2012-11-16 21:55:24 -0800223 { 0x1c, 10, 100000 }, /* D4xx, K4xx, N4xx, D5xx, K5xx, N5xx */
Guenter Roeck2fa52222012-10-09 12:45:23 -0700224 { 0x1c, ANY, 90000 }, /* Z5xx, N2xx, possibly others
225 * Note: Also matches 230 and 330,
226 * which are covered by tjmax_table
227 */
228 { 0x26, ANY, 90000 }, /* Atom Tunnel Creek (Exx), Lincroft (Z6xx)
229 * Note: TjMax for E6xxT is 110C, but CPU type
230 * is undetectable by software
231 */
232 { 0x27, ANY, 90000 }, /* Atom Medfield (Z2460) */
Guenter Roeck14513ee2013-05-27 12:20:19 -0700233 { 0x35, ANY, 90000 }, /* Atom Clover Trail/Cloverview (Z27x0) */
234 { 0x36, ANY, 100000 }, /* Atom Cedar Trail/Cedarview (N2xxx, D2xxx)
235 * Also matches S12x0 (stepping 9), covered by
236 * PCI table
237 */
Guenter Roeck2fa52222012-10-09 12:45:23 -0700238};
239
Paul Gortmakerd23e2ae2013-06-19 14:02:20 -0400240static int adjust_tjmax(struct cpuinfo_x86 *c, u32 id, struct device *dev)
Rudolf Marek118a8872008-02-17 22:59:39 +0100241{
242 /* The 100C is default for both mobile and non mobile CPUs */
243
244 int tjmax = 100000;
Rudolf Marekeccfed42009-09-23 22:59:42 +0200245 int tjmax_ee = 85000;
Rudolf Marek708a62b2009-09-23 22:59:42 +0200246 int usemsr_ee = 1;
Rudolf Marek118a8872008-02-17 22:59:39 +0100247 int err;
248 u32 eax, edx;
Guenter Roeck41e58a1f2012-06-17 18:05:05 +0200249 int i;
Guenter Roeck14513ee2013-05-27 12:20:19 -0700250 struct pci_dev *host_bridge = pci_get_bus_and_slot(0, PCI_DEVFN(0, 0));
Guenter Roeck41e58a1f2012-06-17 18:05:05 +0200251
Guenter Roeck14513ee2013-05-27 12:20:19 -0700252 /*
253 * Explicit tjmax table entries override heuristics.
254 * First try PCI host bridge IDs, followed by model ID strings
255 * and model/stepping information.
256 */
257 if (host_bridge && host_bridge->vendor == PCI_VENDOR_ID_INTEL) {
258 for (i = 0; i < ARRAY_SIZE(tjmax_pci_table); i++) {
259 if (host_bridge->device == tjmax_pci_table[i].device)
260 return tjmax_pci_table[i].tjmax;
261 }
262 }
263
Guenter Roeck41e58a1f2012-06-17 18:05:05 +0200264 for (i = 0; i < ARRAY_SIZE(tjmax_table); i++) {
265 if (strstr(c->x86_model_id, tjmax_table[i].id))
266 return tjmax_table[i].tjmax;
267 }
Rudolf Marek118a8872008-02-17 22:59:39 +0100268
Guenter Roeck2fa52222012-10-09 12:45:23 -0700269 for (i = 0; i < ARRAY_SIZE(tjmax_model_table); i++) {
270 const struct tjmax_model *tm = &tjmax_model_table[i];
271 if (c->x86_model == tm->model &&
272 (tm->mask == ANY || c->x86_mask == tm->mask))
273 return tm->tjmax;
Guenter Roeck72cbddd2012-10-09 12:27:12 -0700274 }
275
Rudolf Marek118a8872008-02-17 22:59:39 +0100276 /* Early chips have no MSR for TjMax */
277
Guenter Roeck4cc45272011-05-19 14:45:48 -0700278 if (c->x86_model == 0xf && c->x86_mask < 4)
Rudolf Marek708a62b2009-09-23 22:59:42 +0200279 usemsr_ee = 0;
Rudolf Marek118a8872008-02-17 22:59:39 +0100280
Guenter Roeck4cc45272011-05-19 14:45:48 -0700281 if (c->x86_model > 0xe && usemsr_ee) {
Rudolf Marekeccfed42009-09-23 22:59:42 +0200282 u8 platform_id;
Rudolf Marek118a8872008-02-17 22:59:39 +0100283
Guenter Roeck4cc45272011-05-19 14:45:48 -0700284 /*
285 * Now we can detect the mobile CPU using Intel provided table
286 * http://softwarecommunity.intel.com/Wiki/Mobility/720.htm
287 * For Core2 cores, check MSR 0x17, bit 28 1 = Mobile CPU
288 */
Rudolf Marek118a8872008-02-17 22:59:39 +0100289 err = rdmsr_safe_on_cpu(id, 0x17, &eax, &edx);
290 if (err) {
291 dev_warn(dev,
292 "Unable to access MSR 0x17, assuming desktop"
293 " CPU\n");
Rudolf Marek708a62b2009-09-23 22:59:42 +0200294 usemsr_ee = 0;
Rudolf Marekeccfed42009-09-23 22:59:42 +0200295 } else if (c->x86_model < 0x17 && !(eax & 0x10000000)) {
Guenter Roeck4cc45272011-05-19 14:45:48 -0700296 /*
297 * Trust bit 28 up to Penryn, I could not find any
298 * documentation on that; if you happen to know
299 * someone at Intel please ask
300 */
Rudolf Marek708a62b2009-09-23 22:59:42 +0200301 usemsr_ee = 0;
Rudolf Marekeccfed42009-09-23 22:59:42 +0200302 } else {
303 /* Platform ID bits 52:50 (EDX starts at bit 32) */
304 platform_id = (edx >> 18) & 0x7;
305
Guenter Roeck4cc45272011-05-19 14:45:48 -0700306 /*
307 * Mobile Penryn CPU seems to be platform ID 7 or 5
308 * (guesswork)
309 */
310 if (c->x86_model == 0x17 &&
311 (platform_id == 5 || platform_id == 7)) {
312 /*
313 * If MSR EE bit is set, set it to 90 degrees C,
314 * otherwise 105 degrees C
315 */
Rudolf Marekeccfed42009-09-23 22:59:42 +0200316 tjmax_ee = 90000;
317 tjmax = 105000;
318 }
Rudolf Marek118a8872008-02-17 22:59:39 +0100319 }
320 }
321
Rudolf Marek708a62b2009-09-23 22:59:42 +0200322 if (usemsr_ee) {
Rudolf Marek118a8872008-02-17 22:59:39 +0100323 err = rdmsr_safe_on_cpu(id, 0xee, &eax, &edx);
324 if (err) {
325 dev_warn(dev,
326 "Unable to access MSR 0xEE, for Tjmax, left"
Dean Nelson4d7a5642010-03-29 22:03:00 +0200327 " at default\n");
Rudolf Marek118a8872008-02-17 22:59:39 +0100328 } else if (eax & 0x40000000) {
Rudolf Marekeccfed42009-09-23 22:59:42 +0200329 tjmax = tjmax_ee;
Rudolf Marek118a8872008-02-17 22:59:39 +0100330 }
Rudolf Marek708a62b2009-09-23 22:59:42 +0200331 } else if (tjmax == 100000) {
Guenter Roeck4cc45272011-05-19 14:45:48 -0700332 /*
333 * If we don't use msr EE it means we are desktop CPU
334 * (with exeception of Atom)
335 */
Rudolf Marek118a8872008-02-17 22:59:39 +0100336 dev_warn(dev, "Using relative temperature scale!\n");
337 }
338
339 return tjmax;
340}
341
Guenter Roeck1c2faa22013-05-27 14:12:15 -0700342static bool cpu_has_tjmax(struct cpuinfo_x86 *c)
343{
344 u8 model = c->x86_model;
345
346 return model > 0xe &&
347 model != 0x1c &&
348 model != 0x26 &&
349 model != 0x27 &&
350 model != 0x35 &&
351 model != 0x36;
352}
353
Paul Gortmakerd23e2ae2013-06-19 14:02:20 -0400354static int get_tjmax(struct cpuinfo_x86 *c, u32 id, struct device *dev)
Carsten Emdea321ced2010-05-24 14:33:41 -0700355{
Carsten Emdea321ced2010-05-24 14:33:41 -0700356 int err;
357 u32 eax, edx;
358 u32 val;
359
Guenter Roeck4cc45272011-05-19 14:45:48 -0700360 /*
361 * A new feature of current Intel(R) processors, the
362 * IA32_TEMPERATURE_TARGET contains the TjMax value
363 */
Carsten Emdea321ced2010-05-24 14:33:41 -0700364 err = rdmsr_safe_on_cpu(id, MSR_IA32_TEMPERATURE_TARGET, &eax, &edx);
365 if (err) {
Guenter Roeck1c2faa22013-05-27 14:12:15 -0700366 if (cpu_has_tjmax(c))
Jean Delvare6bf9e9b2011-09-16 21:21:43 +0200367 dev_warn(dev, "Unable to read TjMax from CPU %u\n", id);
Carsten Emdea321ced2010-05-24 14:33:41 -0700368 } else {
Guenter Roeckc0940e92014-04-30 14:08:14 -0700369 val = (eax >> 16) & 0xff;
Carsten Emdea321ced2010-05-24 14:33:41 -0700370 /*
371 * If the TjMax is not plausible, an assumption
372 * will be used
373 */
Guenter Roeckc0940e92014-04-30 14:08:14 -0700374 if (val) {
Jean Delvare6bf9e9b2011-09-16 21:21:43 +0200375 dev_dbg(dev, "TjMax is %d degrees C\n", val);
Carsten Emdea321ced2010-05-24 14:33:41 -0700376 return val * 1000;
377 }
378 }
379
Jean Delvarea45a8c82011-09-16 21:24:02 +0200380 if (force_tjmax) {
381 dev_notice(dev, "TjMax forced to %d degrees C by user\n",
382 force_tjmax);
383 return force_tjmax * 1000;
384 }
385
Carsten Emdea321ced2010-05-24 14:33:41 -0700386 /*
387 * An assumption is made for early CPUs and unreadable MSR.
Guenter Roeck4f5f71a2011-05-31 06:54:21 -0700388 * NOTE: the calculated value may not be correct.
Carsten Emdea321ced2010-05-24 14:33:41 -0700389 */
Guenter Roeck4f5f71a2011-05-31 06:54:21 -0700390 return adjust_tjmax(c, id, dev);
Carsten Emdea321ced2010-05-24 14:33:41 -0700391}
392
Paul Gortmakerd23e2ae2013-06-19 14:02:20 -0400393static int create_core_attrs(struct temp_data *tdata, struct device *dev,
394 int attr_no)
Durgadoss R199e0de2011-05-20 01:29:35 +0530395{
Guenter Roeck10753052014-02-16 13:23:25 -0800396 int i;
Jan Beuliche3204ed2011-09-23 06:36:53 -0400397 static ssize_t (*const rd_ptr[TOTAL_ATTRS]) (struct device *dev,
Durgadoss R199e0de2011-05-20 01:29:35 +0530398 struct device_attribute *devattr, char *buf) = {
Durgadoss Rc814a4c2011-07-12 07:07:16 -0400399 show_label, show_crit_alarm, show_temp, show_tjmax,
Guenter Roeckf4af6fd2011-09-19 21:41:16 -0700400 show_ttarget };
Rasmus Villemoes1055b5f92015-02-12 15:15:16 +0100401 static const char *const suffixes[TOTAL_ATTRS] = {
402 "label", "crit_alarm", "input", "crit", "max"
403 };
Durgadoss R199e0de2011-05-20 01:29:35 +0530404
Durgadoss Rc814a4c2011-07-12 07:07:16 -0400405 for (i = 0; i < tdata->attr_size; i++) {
Rasmus Villemoes1055b5f92015-02-12 15:15:16 +0100406 snprintf(tdata->attr_name[i], CORETEMP_NAME_LENGTH,
407 "temp%d_%s", attr_no, suffixes[i]);
Sergey Senozhatsky42587812011-05-24 07:28:31 -0400408 sysfs_attr_init(&tdata->sd_attrs[i].dev_attr.attr);
Durgadoss R199e0de2011-05-20 01:29:35 +0530409 tdata->sd_attrs[i].dev_attr.attr.name = tdata->attr_name[i];
410 tdata->sd_attrs[i].dev_attr.attr.mode = S_IRUGO;
411 tdata->sd_attrs[i].dev_attr.show = rd_ptr[i];
Durgadoss R199e0de2011-05-20 01:29:35 +0530412 tdata->sd_attrs[i].index = attr_no;
Guenter Roeck10753052014-02-16 13:23:25 -0800413 tdata->attrs[i] = &tdata->sd_attrs[i].dev_attr.attr;
Durgadoss R199e0de2011-05-20 01:29:35 +0530414 }
Guenter Roeck10753052014-02-16 13:23:25 -0800415 tdata->attr_group.attrs = tdata->attrs;
416 return sysfs_create_group(&dev->kobj, &tdata->attr_group);
Durgadoss R199e0de2011-05-20 01:29:35 +0530417}
418
Rudolf Marekbebe4672007-05-08 17:22:02 +0200419
Paul Gortmakerd23e2ae2013-06-19 14:02:20 -0400420static int chk_ucode_version(unsigned int cpu)
Durgadoss R199e0de2011-05-20 01:29:35 +0530421{
Jean Delvare0eb97822011-09-28 08:11:00 -0700422 struct cpuinfo_x86 *c = &cpu_data(cpu);
Rudolf Marekbebe4672007-05-08 17:22:02 +0200423
Durgadoss R199e0de2011-05-20 01:29:35 +0530424 /*
425 * Check if we have problem with errata AE18 of Core processors:
426 * Readings might stop update when processor visited too deep sleep,
427 * fixed for stepping D0 (6EC).
428 */
Andi Kleenca8bc8d2011-10-12 17:46:35 -0700429 if (c->x86_model == 0xe && c->x86_mask < 0xc && c->microcode < 0x39) {
Guenter Roeckb55f3752013-01-10 10:01:24 -0800430 pr_err("Errata AE18 not fixed, update BIOS or microcode of the CPU!\n");
Andi Kleenca8bc8d2011-10-12 17:46:35 -0700431 return -ENODEV;
Rudolf Marek67f363b2007-05-27 22:17:43 +0200432 }
Durgadoss R199e0de2011-05-20 01:29:35 +0530433 return 0;
434}
Rudolf Marek67f363b2007-05-27 22:17:43 +0200435
Paul Gortmakerd23e2ae2013-06-19 14:02:20 -0400436static struct platform_device *coretemp_get_pdev(unsigned int cpu)
Durgadoss R199e0de2011-05-20 01:29:35 +0530437{
438 u16 phys_proc_id = TO_PHYS_ID(cpu);
439 struct pdev_entry *p;
440
441 mutex_lock(&pdev_list_mutex);
442
443 list_for_each_entry(p, &pdev_list, list)
444 if (p->phys_proc_id == phys_proc_id) {
445 mutex_unlock(&pdev_list_mutex);
446 return p->pdev;
447 }
448
449 mutex_unlock(&pdev_list_mutex);
450 return NULL;
451}
452
Paul Gortmakerd23e2ae2013-06-19 14:02:20 -0400453static struct temp_data *init_temp_data(unsigned int cpu, int pkg_flag)
Durgadoss R199e0de2011-05-20 01:29:35 +0530454{
455 struct temp_data *tdata;
456
457 tdata = kzalloc(sizeof(struct temp_data), GFP_KERNEL);
458 if (!tdata)
459 return NULL;
460
461 tdata->status_reg = pkg_flag ? MSR_IA32_PACKAGE_THERM_STATUS :
462 MSR_IA32_THERM_STATUS;
463 tdata->is_pkg_data = pkg_flag;
464 tdata->cpu = cpu;
465 tdata->cpu_core_id = TO_CORE_ID(cpu);
Durgadoss Rc814a4c2011-07-12 07:07:16 -0400466 tdata->attr_size = MAX_CORE_ATTRS;
Durgadoss R199e0de2011-05-20 01:29:35 +0530467 mutex_init(&tdata->update_lock);
468 return tdata;
469}
470
Paul Gortmakerd23e2ae2013-06-19 14:02:20 -0400471static int create_core_data(struct platform_device *pdev, unsigned int cpu,
472 int pkg_flag)
Durgadoss R199e0de2011-05-20 01:29:35 +0530473{
474 struct temp_data *tdata;
Jan Beulich2f1c3db2011-09-23 06:40:08 -0400475 struct platform_data *pdata = platform_get_drvdata(pdev);
Durgadoss R199e0de2011-05-20 01:29:35 +0530476 struct cpuinfo_x86 *c = &cpu_data(cpu);
477 u32 eax, edx;
478 int err, attr_no;
Rudolf Marekbebe4672007-05-08 17:22:02 +0200479
Carsten Emdea321ced2010-05-24 14:33:41 -0700480 /*
Durgadoss R199e0de2011-05-20 01:29:35 +0530481 * Find attr number for sysfs:
482 * We map the attr number to core id of the CPU
483 * The attr number is always core id + 2
484 * The Pkgtemp will always show up as temp1_*, if available
Carsten Emdea321ced2010-05-24 14:33:41 -0700485 */
Durgadoss R199e0de2011-05-20 01:29:35 +0530486 attr_no = pkg_flag ? 1 : TO_ATTR_NO(cpu);
Rudolf Marek6369a2882008-01-18 00:42:54 +0100487
Durgadoss R199e0de2011-05-20 01:29:35 +0530488 if (attr_no > MAX_CORE_DATA - 1)
489 return -ERANGE;
Rudolf Marek6369a2882008-01-18 00:42:54 +0100490
Guenter Roeckf4e0bcf2011-05-23 14:05:38 -0700491 /*
492 * Provide a single set of attributes for all HT siblings of a core
493 * to avoid duplicate sensors (the processor ID and core ID of all
Guenter Roeck6777b9e2011-05-23 13:52:35 -0700494 * HT siblings of a core are the same).
495 * Skip if a HT sibling of this core is already registered.
Guenter Roeckf4e0bcf2011-05-23 14:05:38 -0700496 * This is not an error.
497 */
Durgadoss R199e0de2011-05-20 01:29:35 +0530498 if (pdata->core_data[attr_no] != NULL)
499 return 0;
Rudolf Marekbebe4672007-05-08 17:22:02 +0200500
Durgadoss R199e0de2011-05-20 01:29:35 +0530501 tdata = init_temp_data(cpu, pkg_flag);
502 if (!tdata)
503 return -ENOMEM;
504
505 /* Test if we can access the status register */
506 err = rdmsr_safe_on_cpu(cpu, tdata->status_reg, &eax, &edx);
507 if (err)
508 goto exit_free;
509
510 /* We can access status register. Get Critical Temperature */
Jean Delvare6bf9e9b2011-09-16 21:21:43 +0200511 tdata->tjmax = get_tjmax(c, cpu, &pdev->dev);
Durgadoss R199e0de2011-05-20 01:29:35 +0530512
Durgadoss Rc814a4c2011-07-12 07:07:16 -0400513 /*
Guenter Roeckf4af6fd2011-09-19 21:41:16 -0700514 * Read the still undocumented bits 8:15 of IA32_TEMPERATURE_TARGET.
515 * The target temperature is available on older CPUs but not in this
516 * register. Atoms don't have the register at all.
Durgadoss Rc814a4c2011-07-12 07:07:16 -0400517 */
Guenter Roeckf4af6fd2011-09-19 21:41:16 -0700518 if (c->x86_model > 0xe && c->x86_model != 0x1c) {
519 err = rdmsr_safe_on_cpu(cpu, MSR_IA32_TEMPERATURE_TARGET,
520 &eax, &edx);
521 if (!err) {
522 tdata->ttarget
523 = tdata->tjmax - ((eax >> 8) & 0xff) * 1000;
524 tdata->attr_size++;
525 }
Durgadoss Rc814a4c2011-07-12 07:07:16 -0400526 }
527
Durgadoss R199e0de2011-05-20 01:29:35 +0530528 pdata->core_data[attr_no] = tdata;
529
530 /* Create sysfs interfaces */
Guenter Roeckd72d19c2014-02-16 15:49:04 -0800531 err = create_core_attrs(tdata, pdata->hwmon_dev, attr_no);
Durgadoss R199e0de2011-05-20 01:29:35 +0530532 if (err)
533 goto exit_free;
Rudolf Marekbebe4672007-05-08 17:22:02 +0200534
535 return 0;
Rudolf Marekbebe4672007-05-08 17:22:02 +0200536exit_free:
Guenter Roeck20ecb492011-09-24 15:27:04 -0700537 pdata->core_data[attr_no] = NULL;
Durgadoss R199e0de2011-05-20 01:29:35 +0530538 kfree(tdata);
539 return err;
540}
541
Paul Gortmakerd23e2ae2013-06-19 14:02:20 -0400542static void coretemp_add_core(unsigned int cpu, int pkg_flag)
Durgadoss R199e0de2011-05-20 01:29:35 +0530543{
Durgadoss R199e0de2011-05-20 01:29:35 +0530544 struct platform_device *pdev = coretemp_get_pdev(cpu);
545 int err;
546
547 if (!pdev)
548 return;
549
Jan Beulich2f1c3db2011-09-23 06:40:08 -0400550 err = create_core_data(pdev, cpu, pkg_flag);
Durgadoss R199e0de2011-05-20 01:29:35 +0530551 if (err)
552 dev_err(&pdev->dev, "Adding Core %u failed\n", cpu);
553}
554
555static void coretemp_remove_core(struct platform_data *pdata,
Guenter Roeckd72d19c2014-02-16 15:49:04 -0800556 int indx)
Durgadoss R199e0de2011-05-20 01:29:35 +0530557{
Durgadoss R199e0de2011-05-20 01:29:35 +0530558 struct temp_data *tdata = pdata->core_data[indx];
559
560 /* Remove the sysfs attributes */
Guenter Roeckd72d19c2014-02-16 15:49:04 -0800561 sysfs_remove_group(&pdata->hwmon_dev->kobj, &tdata->attr_group);
Durgadoss R199e0de2011-05-20 01:29:35 +0530562
563 kfree(pdata->core_data[indx]);
564 pdata->core_data[indx] = NULL;
565}
566
Bill Pemberton6c931ae2012-11-19 13:22:35 -0500567static int coretemp_probe(struct platform_device *pdev)
Durgadoss R199e0de2011-05-20 01:29:35 +0530568{
Guenter Roeckc503a812014-02-16 15:29:55 -0800569 struct device *dev = &pdev->dev;
Durgadoss R199e0de2011-05-20 01:29:35 +0530570 struct platform_data *pdata;
Durgadoss R199e0de2011-05-20 01:29:35 +0530571
Durgadoss R199e0de2011-05-20 01:29:35 +0530572 /* Initialize the per-package data structures */
Guenter Roeckc503a812014-02-16 15:29:55 -0800573 pdata = devm_kzalloc(dev, sizeof(struct platform_data), GFP_KERNEL);
Durgadoss R199e0de2011-05-20 01:29:35 +0530574 if (!pdata)
575 return -ENOMEM;
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
Guenter Roeckd72d19c2014-02-16 15:49:04 -0800580 pdata->hwmon_dev = devm_hwmon_device_register_with_groups(dev, DRVNAME,
581 pdata, NULL);
582 return PTR_ERR_OR_ZERO(pdata->hwmon_dev);
Rudolf Marekbebe4672007-05-08 17:22:02 +0200583}
584
Bill Pemberton281dfd02012-11-19 13:25:51 -0500585static int coretemp_remove(struct platform_device *pdev)
Rudolf Marekbebe4672007-05-08 17:22:02 +0200586{
Durgadoss R199e0de2011-05-20 01:29:35 +0530587 struct platform_data *pdata = platform_get_drvdata(pdev);
588 int i;
Rudolf Marekbebe4672007-05-08 17:22:02 +0200589
Durgadoss R199e0de2011-05-20 01:29:35 +0530590 for (i = MAX_CORE_DATA - 1; i >= 0; --i)
591 if (pdata->core_data[i])
Guenter Roeckd72d19c2014-02-16 15:49:04 -0800592 coretemp_remove_core(pdata, i);
Durgadoss R199e0de2011-05-20 01:29:35 +0530593
Rudolf Marekbebe4672007-05-08 17:22:02 +0200594 return 0;
595}
596
597static struct platform_driver coretemp_driver = {
598 .driver = {
Rudolf Marekbebe4672007-05-08 17:22:02 +0200599 .name = DRVNAME,
600 },
601 .probe = coretemp_probe,
Bill Pemberton9e5e9b72012-11-19 13:21:20 -0500602 .remove = coretemp_remove,
Rudolf Marekbebe4672007-05-08 17:22:02 +0200603};
604
Paul Gortmakerd23e2ae2013-06-19 14:02:20 -0400605static int coretemp_device_add(unsigned int cpu)
Rudolf Marekbebe4672007-05-08 17:22:02 +0200606{
607 int err;
608 struct platform_device *pdev;
609 struct pdev_entry *pdev_entry;
Jean Delvared883b9f2010-07-09 16:22:49 +0200610
611 mutex_lock(&pdev_list_mutex);
612
Jan Beulichb3a242a2011-09-23 06:35:00 -0400613 pdev = platform_device_alloc(DRVNAME, TO_PHYS_ID(cpu));
Rudolf Marekbebe4672007-05-08 17:22:02 +0200614 if (!pdev) {
615 err = -ENOMEM;
Joe Perchesf8bb8922010-10-20 06:51:31 +0000616 pr_err("Device allocation failed\n");
Rudolf Marekbebe4672007-05-08 17:22:02 +0200617 goto exit;
618 }
619
620 pdev_entry = kzalloc(sizeof(struct pdev_entry), GFP_KERNEL);
621 if (!pdev_entry) {
622 err = -ENOMEM;
623 goto exit_device_put;
624 }
625
626 err = platform_device_add(pdev);
627 if (err) {
Joe Perchesf8bb8922010-10-20 06:51:31 +0000628 pr_err("Device addition failed (%d)\n", err);
Rudolf Marekbebe4672007-05-08 17:22:02 +0200629 goto exit_device_free;
630 }
631
632 pdev_entry->pdev = pdev;
Jean Delvare0eb97822011-09-28 08:11:00 -0700633 pdev_entry->phys_proc_id = pdev->id;
Durgadoss R199e0de2011-05-20 01:29:35 +0530634
Rudolf Marekbebe4672007-05-08 17:22:02 +0200635 list_add_tail(&pdev_entry->list, &pdev_list);
636 mutex_unlock(&pdev_list_mutex);
637
638 return 0;
639
640exit_device_free:
641 kfree(pdev_entry);
642exit_device_put:
643 platform_device_put(pdev);
644exit:
Jean Delvared883b9f2010-07-09 16:22:49 +0200645 mutex_unlock(&pdev_list_mutex);
Rudolf Marekbebe4672007-05-08 17:22:02 +0200646 return err;
647}
648
Paul Gortmakerd23e2ae2013-06-19 14:02:20 -0400649static void coretemp_device_remove(unsigned int cpu)
Rudolf Marekbebe4672007-05-08 17:22:02 +0200650{
Durgadoss R199e0de2011-05-20 01:29:35 +0530651 struct pdev_entry *p, *n;
652 u16 phys_proc_id = TO_PHYS_ID(cpu);
Jan Beuliche40cc4b2010-09-13 10:23:05 +0000653
Rudolf Marekbebe4672007-05-08 17:22:02 +0200654 mutex_lock(&pdev_list_mutex);
Durgadoss R199e0de2011-05-20 01:29:35 +0530655 list_for_each_entry_safe(p, n, &pdev_list, list) {
656 if (p->phys_proc_id != phys_proc_id)
Jan Beuliche40cc4b2010-09-13 10:23:05 +0000657 continue;
Jan Beuliche40cc4b2010-09-13 10:23:05 +0000658 platform_device_unregister(p->pdev);
659 list_del(&p->list);
Jan Beuliche40cc4b2010-09-13 10:23:05 +0000660 kfree(p);
Rudolf Marekbebe4672007-05-08 17:22:02 +0200661 }
662 mutex_unlock(&pdev_list_mutex);
663}
664
Paul Gortmakerd23e2ae2013-06-19 14:02:20 -0400665static bool is_any_core_online(struct platform_data *pdata)
Durgadoss R199e0de2011-05-20 01:29:35 +0530666{
667 int i;
668
669 /* Find online cores, except pkgtemp data */
670 for (i = MAX_CORE_DATA - 1; i >= 0; --i) {
671 if (pdata->core_data[i] &&
672 !pdata->core_data[i]->is_pkg_data) {
673 return true;
674 }
675 }
676 return false;
677}
678
Paul Gortmakerd23e2ae2013-06-19 14:02:20 -0400679static void get_core_online(unsigned int cpu)
Durgadoss R199e0de2011-05-20 01:29:35 +0530680{
681 struct cpuinfo_x86 *c = &cpu_data(cpu);
682 struct platform_device *pdev = coretemp_get_pdev(cpu);
683 int err;
684
685 /*
686 * CPUID.06H.EAX[0] indicates whether the CPU has thermal
687 * sensors. We check this bit only, all the early CPUs
688 * without thermal sensors will be filtered out.
689 */
H. Peter Anvin4ad33412012-06-22 10:58:06 -0700690 if (!cpu_has(c, X86_FEATURE_DTHERM))
Durgadoss R199e0de2011-05-20 01:29:35 +0530691 return;
692
693 if (!pdev) {
Jean Delvare0eb97822011-09-28 08:11:00 -0700694 /* Check the microcode version of the CPU */
695 if (chk_ucode_version(cpu))
696 return;
697
Durgadoss R199e0de2011-05-20 01:29:35 +0530698 /*
699 * Alright, we have DTS support.
700 * We are bringing the _first_ core in this pkg
701 * online. So, initialize per-pkg data structures and
702 * then bring this core online.
703 */
704 err = coretemp_device_add(cpu);
705 if (err)
706 return;
707 /*
708 * Check whether pkgtemp support is available.
709 * If so, add interfaces for pkgtemp.
710 */
711 if (cpu_has(c, X86_FEATURE_PTS))
712 coretemp_add_core(cpu, 1);
713 }
714 /*
715 * Physical CPU device already exists.
716 * So, just add interfaces for this core.
717 */
718 coretemp_add_core(cpu, 0);
719}
720
Paul Gortmakerd23e2ae2013-06-19 14:02:20 -0400721static void put_core_offline(unsigned int cpu)
Durgadoss R199e0de2011-05-20 01:29:35 +0530722{
723 int i, indx;
724 struct platform_data *pdata;
725 struct platform_device *pdev = coretemp_get_pdev(cpu);
726
727 /* If the physical CPU device does not exist, just return */
728 if (!pdev)
729 return;
730
731 pdata = platform_get_drvdata(pdev);
732
733 indx = TO_ATTR_NO(cpu);
734
Kirill A. Shutemovb7048712012-04-30 09:18:01 -0400735 /* The core id is too big, just return */
736 if (indx > MAX_CORE_DATA - 1)
737 return;
738
Durgadoss R199e0de2011-05-20 01:29:35 +0530739 if (pdata->core_data[indx] && pdata->core_data[indx]->cpu == cpu)
Guenter Roeckd72d19c2014-02-16 15:49:04 -0800740 coretemp_remove_core(pdata, indx);
Durgadoss R199e0de2011-05-20 01:29:35 +0530741
Guenter Roeckf4e0bcf2011-05-23 14:05:38 -0700742 /*
Guenter Roeck6777b9e2011-05-23 13:52:35 -0700743 * If a HT sibling of a core is taken offline, but another HT sibling
744 * of the same core is still online, register the alternate sibling.
745 * This ensures that exactly one set of attributes is provided as long
746 * as at least one HT sibling of a core is online.
Guenter Roeckf4e0bcf2011-05-23 14:05:38 -0700747 */
Guenter Roeckbb74e8c2011-05-23 12:06:41 -0700748 for_each_sibling(i, cpu) {
Durgadoss R199e0de2011-05-20 01:29:35 +0530749 if (i != cpu) {
750 get_core_online(i);
Guenter Roeckf4e0bcf2011-05-23 14:05:38 -0700751 /*
752 * Display temperature sensor data for one HT sibling
753 * per core only, so abort the loop after one such
754 * sibling has been found.
755 */
Durgadoss R199e0de2011-05-20 01:29:35 +0530756 break;
757 }
758 }
759 /*
760 * If all cores in this pkg are offline, remove the device.
761 * coretemp_device_remove calls unregister_platform_device,
762 * which in turn calls coretemp_remove. This removes the
763 * pkgtemp entry and does other clean ups.
764 */
765 if (!is_any_core_online(pdata))
766 coretemp_device_remove(cpu);
767}
768
Paul Gortmakerd23e2ae2013-06-19 14:02:20 -0400769static int coretemp_cpu_callback(struct notifier_block *nfb,
Rudolf Marekbebe4672007-05-08 17:22:02 +0200770 unsigned long action, void *hcpu)
771{
772 unsigned int cpu = (unsigned long) hcpu;
773
774 switch (action) {
775 case CPU_ONLINE:
Rafael J. Wysocki561d9a92007-12-03 18:01:50 +0100776 case CPU_DOWN_FAILED:
Durgadoss R199e0de2011-05-20 01:29:35 +0530777 get_core_online(cpu);
Rudolf Marekbebe4672007-05-08 17:22:02 +0200778 break;
Rafael J. Wysocki561d9a92007-12-03 18:01:50 +0100779 case CPU_DOWN_PREPARE:
Durgadoss R199e0de2011-05-20 01:29:35 +0530780 put_core_offline(cpu);
Rudolf Marekbebe4672007-05-08 17:22:02 +0200781 break;
782 }
783 return NOTIFY_OK;
784}
785
Sam Ravnborgba7c1922008-02-17 13:22:51 +0100786static struct notifier_block coretemp_cpu_notifier __refdata = {
Rudolf Marekbebe4672007-05-08 17:22:02 +0200787 .notifier_call = coretemp_cpu_callback,
788};
Rudolf Marekbebe4672007-05-08 17:22:02 +0200789
Jan Beuliche273bd92012-07-30 11:33:00 +0200790static const struct x86_cpu_id __initconst coretemp_ids[] = {
H. Peter Anvin4ad33412012-06-22 10:58:06 -0700791 { X86_VENDOR_INTEL, X86_FAMILY_ANY, X86_MODEL_ANY, X86_FEATURE_DTHERM },
Andi Kleen9b380962012-01-26 00:09:10 +0100792 {}
793};
794MODULE_DEVICE_TABLE(x86cpu, coretemp_ids);
795
Rudolf Marekbebe4672007-05-08 17:22:02 +0200796static int __init coretemp_init(void)
797{
Jean Delvare1268a172012-06-17 18:05:06 +0200798 int i, err;
Rudolf Marekbebe4672007-05-08 17:22:02 +0200799
Andi Kleen9b380962012-01-26 00:09:10 +0100800 /*
801 * CPUID.06H.EAX[0] indicates whether the CPU has thermal
802 * sensors. We check this bit only, all the early CPUs
803 * without thermal sensors will be filtered out.
804 */
805 if (!x86_match_cpu(coretemp_ids))
806 return -ENODEV;
Rudolf Marekbebe4672007-05-08 17:22:02 +0200807
808 err = platform_driver_register(&coretemp_driver);
809 if (err)
810 goto exit;
811
Srivatsa S. Bhat32897052014-03-11 02:11:11 +0530812 cpu_notifier_register_begin();
Jan Beulicha4659052010-09-23 22:21:34 -0700813 for_each_online_cpu(i)
Durgadoss R199e0de2011-05-20 01:29:35 +0530814 get_core_online(i);
Jan Beulich89a3fd32010-09-13 10:05:51 +0000815
816#ifndef CONFIG_HOTPLUG_CPU
Rudolf Marekbebe4672007-05-08 17:22:02 +0200817 if (list_empty(&pdev_list)) {
Srivatsa S. Bhat32897052014-03-11 02:11:11 +0530818 cpu_notifier_register_done();
Rudolf Marekbebe4672007-05-08 17:22:02 +0200819 err = -ENODEV;
820 goto exit_driver_unreg;
821 }
Jan Beulich89a3fd32010-09-13 10:05:51 +0000822#endif
Rudolf Marekbebe4672007-05-08 17:22:02 +0200823
Srivatsa S. Bhat32897052014-03-11 02:11:11 +0530824 __register_hotcpu_notifier(&coretemp_cpu_notifier);
825 cpu_notifier_register_done();
Rudolf Marekbebe4672007-05-08 17:22:02 +0200826 return 0;
827
Chen Gong0dca94b2010-08-09 17:21:09 -0700828#ifndef CONFIG_HOTPLUG_CPU
Jan Beulich89a3fd32010-09-13 10:05:51 +0000829exit_driver_unreg:
Rudolf Marekbebe4672007-05-08 17:22:02 +0200830 platform_driver_unregister(&coretemp_driver);
Chen Gong0dca94b2010-08-09 17:21:09 -0700831#endif
Rudolf Marekbebe4672007-05-08 17:22:02 +0200832exit:
833 return err;
834}
835
836static void __exit coretemp_exit(void)
837{
838 struct pdev_entry *p, *n;
Chen Gong17c10d62010-10-08 22:01:48 -0400839
Srivatsa S. Bhat32897052014-03-11 02:11:11 +0530840 cpu_notifier_register_begin();
841 __unregister_hotcpu_notifier(&coretemp_cpu_notifier);
Rudolf Marekbebe4672007-05-08 17:22:02 +0200842 mutex_lock(&pdev_list_mutex);
843 list_for_each_entry_safe(p, n, &pdev_list, list) {
844 platform_device_unregister(p->pdev);
845 list_del(&p->list);
846 kfree(p);
847 }
848 mutex_unlock(&pdev_list_mutex);
Srivatsa S. Bhat32897052014-03-11 02:11:11 +0530849 cpu_notifier_register_done();
Rudolf Marekbebe4672007-05-08 17:22:02 +0200850 platform_driver_unregister(&coretemp_driver);
851}
852
853MODULE_AUTHOR("Rudolf Marek <r.marek@assembler.cz>");
854MODULE_DESCRIPTION("Intel Core temperature monitor");
855MODULE_LICENSE("GPL");
856
857module_init(coretemp_init)
858module_exit(coretemp_exit)