blob: 85e937984ff7594a8a610db84c08871898c67f15 [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>
Yong Wang1fe63ab2010-01-10 20:52:34 +010037#include <linux/pci.h>
Guenter Roeck4cc45272011-05-19 14:45:48 -070038#include <linux/smp.h>
Rudolf Marekbebe4672007-05-08 17:22:02 +020039#include <asm/msr.h>
40#include <asm/processor.h>
41
42#define DRVNAME "coretemp"
43
Durgadoss R199e0de2011-05-20 01:29:35 +053044#define BASE_SYSFS_ATTR_NO 2 /* Sysfs Base attr no for coretemp */
45#define NUM_REAL_CORES 16 /* Number of Real cores per cpu */
46#define CORETEMP_NAME_LENGTH 17 /* String Length of attrs */
47#define MAX_ATTRS 5 /* Maximum no of per-core attrs */
48#define MAX_CORE_DATA (NUM_REAL_CORES + BASE_SYSFS_ATTR_NO)
49
50#ifdef CONFIG_SMP
51#define TO_PHYS_ID(cpu) cpu_data(cpu).phys_proc_id
52#define TO_CORE_ID(cpu) cpu_data(cpu).cpu_core_id
53#define TO_ATTR_NO(cpu) (TO_CORE_ID(cpu) + BASE_SYSFS_ATTR_NO)
Guenter Roeckbb74e8c2011-05-23 12:06:41 -070054#define for_each_sibling(i, cpu) for_each_cpu(i, cpu_sibling_mask(cpu))
Durgadoss R199e0de2011-05-20 01:29:35 +053055#else
56#define TO_PHYS_ID(cpu) (cpu)
57#define TO_CORE_ID(cpu) (cpu)
58#define TO_ATTR_NO(cpu) (cpu)
Guenter Roeckbb74e8c2011-05-23 12:06:41 -070059#define for_each_sibling(i, cpu) for (i = 0; false; )
Durgadoss R199e0de2011-05-20 01:29:35 +053060#endif
Rudolf Marekbebe4672007-05-08 17:22:02 +020061
62/*
Durgadoss R199e0de2011-05-20 01:29:35 +053063 * Per-Core Temperature Data
64 * @last_updated: The time when the current temperature value was updated
65 * earlier (in jiffies).
66 * @cpu_core_id: The CPU Core from which temperature values should be read
67 * This value is passed as "id" field to rdmsr/wrmsr functions.
68 * @status_reg: One of IA32_THERM_STATUS or IA32_PACKAGE_THERM_STATUS,
69 * from where the temperature values should be read.
70 * @is_pkg_data: If this is 1, the temp_data holds pkgtemp data.
71 * Otherwise, temp_data holds coretemp data.
72 * @valid: If this is 1, the current temperature is valid.
Rudolf Marekbebe4672007-05-08 17:22:02 +020073 */
Durgadoss R199e0de2011-05-20 01:29:35 +053074struct temp_data {
Rudolf Marekbebe4672007-05-08 17:22:02 +020075 int temp;
Rudolf Marek6369a2882008-01-18 00:42:54 +010076 int ttarget;
Durgadoss R199e0de2011-05-20 01:29:35 +053077 int tjmax;
78 unsigned long last_updated;
79 unsigned int cpu;
80 u32 cpu_core_id;
81 u32 status_reg;
82 bool is_pkg_data;
83 bool valid;
84 struct sensor_device_attribute sd_attrs[MAX_ATTRS];
85 char attr_name[MAX_ATTRS][CORETEMP_NAME_LENGTH];
86 struct mutex update_lock;
Rudolf Marekbebe4672007-05-08 17:22:02 +020087};
88
Durgadoss R199e0de2011-05-20 01:29:35 +053089/* Platform Data per Physical CPU */
90struct platform_data {
91 struct device *hwmon_dev;
92 u16 phys_proc_id;
93 struct temp_data *core_data[MAX_CORE_DATA];
94 struct device_attribute name_attr;
95};
Rudolf Marekbebe4672007-05-08 17:22:02 +020096
Durgadoss R199e0de2011-05-20 01:29:35 +053097struct pdev_entry {
98 struct list_head list;
99 struct platform_device *pdev;
100 unsigned int cpu;
101 u16 phys_proc_id;
102 u16 cpu_core_id;
103};
104
105static LIST_HEAD(pdev_list);
106static DEFINE_MUTEX(pdev_list_mutex);
107
108static ssize_t show_name(struct device *dev,
109 struct device_attribute *devattr, char *buf)
Rudolf Marekbebe4672007-05-08 17:22:02 +0200110{
Durgadoss R199e0de2011-05-20 01:29:35 +0530111 return sprintf(buf, "%s\n", DRVNAME);
Rudolf Marekbebe4672007-05-08 17:22:02 +0200112}
113
Durgadoss R199e0de2011-05-20 01:29:35 +0530114static ssize_t show_label(struct device *dev,
115 struct device_attribute *devattr, char *buf)
Rudolf Marekbebe4672007-05-08 17:22:02 +0200116{
Durgadoss R199e0de2011-05-20 01:29:35 +0530117 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
118 struct platform_data *pdata = dev_get_drvdata(dev);
119 struct temp_data *tdata = pdata->core_data[attr->index];
120
121 if (tdata->is_pkg_data)
122 return sprintf(buf, "Physical id %u\n", pdata->phys_proc_id);
123
124 return sprintf(buf, "Core %u\n", tdata->cpu_core_id);
125}
126
127static ssize_t show_crit_alarm(struct device *dev,
128 struct device_attribute *devattr, char *buf)
129{
130 u32 eax, edx;
131 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
132 struct platform_data *pdata = dev_get_drvdata(dev);
133 struct temp_data *tdata = pdata->core_data[attr->index];
134
135 rdmsr_on_cpu(tdata->cpu, tdata->status_reg, &eax, &edx);
136
137 return sprintf(buf, "%d\n", (eax >> 5) & 1);
138}
139
140static ssize_t show_tjmax(struct device *dev,
141 struct device_attribute *devattr, char *buf)
142{
143 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
144 struct platform_data *pdata = dev_get_drvdata(dev);
145
146 return sprintf(buf, "%d\n", pdata->core_data[attr->index]->tjmax);
147}
148
149static ssize_t show_ttarget(struct device *dev,
150 struct device_attribute *devattr, char *buf)
151{
152 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
153 struct platform_data *pdata = dev_get_drvdata(dev);
154
155 return sprintf(buf, "%d\n", pdata->core_data[attr->index]->ttarget);
Rudolf Marekbebe4672007-05-08 17:22:02 +0200156}
157
158static ssize_t show_temp(struct device *dev,
Durgadoss R199e0de2011-05-20 01:29:35 +0530159 struct device_attribute *devattr, char *buf)
Rudolf Marekbebe4672007-05-08 17:22:02 +0200160{
Durgadoss R199e0de2011-05-20 01:29:35 +0530161 u32 eax, edx;
Rudolf Marekbebe4672007-05-08 17:22:02 +0200162 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
Durgadoss R199e0de2011-05-20 01:29:35 +0530163 struct platform_data *pdata = dev_get_drvdata(dev);
164 struct temp_data *tdata = pdata->core_data[attr->index];
Rudolf Marekbebe4672007-05-08 17:22:02 +0200165
Durgadoss R199e0de2011-05-20 01:29:35 +0530166 mutex_lock(&tdata->update_lock);
Rudolf Marekbebe4672007-05-08 17:22:02 +0200167
Durgadoss R199e0de2011-05-20 01:29:35 +0530168 /* Check whether the time interval has elapsed */
169 if (!tdata->valid || time_after(jiffies, tdata->last_updated + HZ)) {
170 rdmsr_on_cpu(tdata->cpu, tdata->status_reg, &eax, &edx);
171 tdata->valid = 0;
172 /* Check whether the data is valid */
Rudolf Marekbebe4672007-05-08 17:22:02 +0200173 if (eax & 0x80000000) {
Durgadoss R199e0de2011-05-20 01:29:35 +0530174 tdata->temp = tdata->tjmax -
Guenter Roeck4cc45272011-05-19 14:45:48 -0700175 ((eax >> 16) & 0x7f) * 1000;
Durgadoss R199e0de2011-05-20 01:29:35 +0530176 tdata->valid = 1;
Rudolf Marekbebe4672007-05-08 17:22:02 +0200177 }
Durgadoss R199e0de2011-05-20 01:29:35 +0530178 tdata->last_updated = jiffies;
Rudolf Marekbebe4672007-05-08 17:22:02 +0200179 }
180
Durgadoss R199e0de2011-05-20 01:29:35 +0530181 mutex_unlock(&tdata->update_lock);
182 return tdata->valid ? sprintf(buf, "%d\n", tdata->temp) : -EAGAIN;
Rudolf Marekbebe4672007-05-08 17:22:02 +0200183}
184
Durgadoss R199e0de2011-05-20 01:29:35 +0530185static int adjust_tjmax(struct cpuinfo_x86 *c, u32 id, struct device *dev)
Rudolf Marek118a8872008-02-17 22:59:39 +0100186{
187 /* The 100C is default for both mobile and non mobile CPUs */
188
189 int tjmax = 100000;
Rudolf Marekeccfed42009-09-23 22:59:42 +0200190 int tjmax_ee = 85000;
Rudolf Marek708a62b2009-09-23 22:59:42 +0200191 int usemsr_ee = 1;
Rudolf Marek118a8872008-02-17 22:59:39 +0100192 int err;
193 u32 eax, edx;
Yong Wang1fe63ab2010-01-10 20:52:34 +0100194 struct pci_dev *host_bridge;
Rudolf Marek118a8872008-02-17 22:59:39 +0100195
196 /* Early chips have no MSR for TjMax */
197
Guenter Roeck4cc45272011-05-19 14:45:48 -0700198 if (c->x86_model == 0xf && c->x86_mask < 4)
Rudolf Marek708a62b2009-09-23 22:59:42 +0200199 usemsr_ee = 0;
Rudolf Marek118a8872008-02-17 22:59:39 +0100200
Yong Wang1fe63ab2010-01-10 20:52:34 +0100201 /* Atom CPUs */
Rudolf Marek708a62b2009-09-23 22:59:42 +0200202
203 if (c->x86_model == 0x1c) {
204 usemsr_ee = 0;
Yong Wang1fe63ab2010-01-10 20:52:34 +0100205
206 host_bridge = pci_get_bus_and_slot(0, PCI_DEVFN(0, 0));
207
208 if (host_bridge && host_bridge->vendor == PCI_VENDOR_ID_INTEL
209 && (host_bridge->device == 0xa000 /* NM10 based nettop */
210 || host_bridge->device == 0xa010)) /* NM10 based netbook */
211 tjmax = 100000;
212 else
213 tjmax = 90000;
214
215 pci_dev_put(host_bridge);
Rudolf Marek708a62b2009-09-23 22:59:42 +0200216 }
217
Guenter Roeck4cc45272011-05-19 14:45:48 -0700218 if (c->x86_model > 0xe && usemsr_ee) {
Rudolf Marekeccfed42009-09-23 22:59:42 +0200219 u8 platform_id;
Rudolf Marek118a8872008-02-17 22:59:39 +0100220
Guenter Roeck4cc45272011-05-19 14:45:48 -0700221 /*
222 * Now we can detect the mobile CPU using Intel provided table
223 * http://softwarecommunity.intel.com/Wiki/Mobility/720.htm
224 * For Core2 cores, check MSR 0x17, bit 28 1 = Mobile CPU
225 */
Rudolf Marek118a8872008-02-17 22:59:39 +0100226 err = rdmsr_safe_on_cpu(id, 0x17, &eax, &edx);
227 if (err) {
228 dev_warn(dev,
229 "Unable to access MSR 0x17, assuming desktop"
230 " CPU\n");
Rudolf Marek708a62b2009-09-23 22:59:42 +0200231 usemsr_ee = 0;
Rudolf Marekeccfed42009-09-23 22:59:42 +0200232 } else if (c->x86_model < 0x17 && !(eax & 0x10000000)) {
Guenter Roeck4cc45272011-05-19 14:45:48 -0700233 /*
234 * Trust bit 28 up to Penryn, I could not find any
235 * documentation on that; if you happen to know
236 * someone at Intel please ask
237 */
Rudolf Marek708a62b2009-09-23 22:59:42 +0200238 usemsr_ee = 0;
Rudolf Marekeccfed42009-09-23 22:59:42 +0200239 } else {
240 /* Platform ID bits 52:50 (EDX starts at bit 32) */
241 platform_id = (edx >> 18) & 0x7;
242
Guenter Roeck4cc45272011-05-19 14:45:48 -0700243 /*
244 * Mobile Penryn CPU seems to be platform ID 7 or 5
245 * (guesswork)
246 */
247 if (c->x86_model == 0x17 &&
248 (platform_id == 5 || platform_id == 7)) {
249 /*
250 * If MSR EE bit is set, set it to 90 degrees C,
251 * otherwise 105 degrees C
252 */
Rudolf Marekeccfed42009-09-23 22:59:42 +0200253 tjmax_ee = 90000;
254 tjmax = 105000;
255 }
Rudolf Marek118a8872008-02-17 22:59:39 +0100256 }
257 }
258
Rudolf Marek708a62b2009-09-23 22:59:42 +0200259 if (usemsr_ee) {
Rudolf Marek118a8872008-02-17 22:59:39 +0100260 err = rdmsr_safe_on_cpu(id, 0xee, &eax, &edx);
261 if (err) {
262 dev_warn(dev,
263 "Unable to access MSR 0xEE, for Tjmax, left"
Dean Nelson4d7a5642010-03-29 22:03:00 +0200264 " at default\n");
Rudolf Marek118a8872008-02-17 22:59:39 +0100265 } else if (eax & 0x40000000) {
Rudolf Marekeccfed42009-09-23 22:59:42 +0200266 tjmax = tjmax_ee;
Rudolf Marek118a8872008-02-17 22:59:39 +0100267 }
Rudolf Marek708a62b2009-09-23 22:59:42 +0200268 } else if (tjmax == 100000) {
Guenter Roeck4cc45272011-05-19 14:45:48 -0700269 /*
270 * If we don't use msr EE it means we are desktop CPU
271 * (with exeception of Atom)
272 */
Rudolf Marek118a8872008-02-17 22:59:39 +0100273 dev_warn(dev, "Using relative temperature scale!\n");
274 }
275
276 return tjmax;
277}
278
Durgadoss R199e0de2011-05-20 01:29:35 +0530279static int get_tjmax(struct cpuinfo_x86 *c, u32 id, struct device *dev)
Carsten Emdea321ced2010-05-24 14:33:41 -0700280{
281 /* The 100C is default for both mobile and non mobile CPUs */
282 int err;
283 u32 eax, edx;
284 u32 val;
285
Guenter Roeck4cc45272011-05-19 14:45:48 -0700286 /*
287 * A new feature of current Intel(R) processors, the
288 * IA32_TEMPERATURE_TARGET contains the TjMax value
289 */
Carsten Emdea321ced2010-05-24 14:33:41 -0700290 err = rdmsr_safe_on_cpu(id, MSR_IA32_TEMPERATURE_TARGET, &eax, &edx);
291 if (err) {
292 dev_warn(dev, "Unable to read TjMax from CPU.\n");
293 } else {
294 val = (eax >> 16) & 0xff;
295 /*
296 * If the TjMax is not plausible, an assumption
297 * will be used
298 */
Guenter Roeckbb9973e2011-06-01 11:03:41 -0700299 if (val) {
Carsten Emdea321ced2010-05-24 14:33:41 -0700300 dev_info(dev, "TjMax is %d C.\n", val);
301 return val * 1000;
302 }
303 }
304
305 /*
306 * An assumption is made for early CPUs and unreadable MSR.
Guenter Roeck4f5f71a2011-05-31 06:54:21 -0700307 * NOTE: the calculated value may not be correct.
Carsten Emdea321ced2010-05-24 14:33:41 -0700308 */
Guenter Roeck4f5f71a2011-05-31 06:54:21 -0700309 return adjust_tjmax(c, id, dev);
Carsten Emdea321ced2010-05-24 14:33:41 -0700310}
311
Jan Beulich32478002010-10-08 04:59:38 -0400312static void __devinit get_ucode_rev_on_cpu(void *edx)
313{
314 u32 eax;
315
316 wrmsr(MSR_IA32_UCODE_REV, 0, 0);
317 sync_core();
318 rdmsr(MSR_IA32_UCODE_REV, eax, *(u32 *)edx);
319}
320
Durgadoss R199e0de2011-05-20 01:29:35 +0530321static int get_pkg_tjmax(unsigned int cpu, struct device *dev)
Rudolf Marekbebe4672007-05-08 17:22:02 +0200322{
Durgadoss R199e0de2011-05-20 01:29:35 +0530323 int err;
324 u32 eax, edx, val;
325
326 err = rdmsr_safe_on_cpu(cpu, MSR_IA32_TEMPERATURE_TARGET, &eax, &edx);
327 if (!err) {
328 val = (eax >> 16) & 0xff;
Guenter Roeckbb9973e2011-06-01 11:03:41 -0700329 if (val)
Durgadoss R199e0de2011-05-20 01:29:35 +0530330 return val * 1000;
331 }
332 dev_warn(dev, "Unable to read Pkg-TjMax from CPU:%u\n", cpu);
333 return 100000; /* Default TjMax: 100 degree celsius */
334}
335
336static int create_name_attr(struct platform_data *pdata, struct device *dev)
337{
Sergey Senozhatsky42587812011-05-24 07:28:31 -0400338 sysfs_attr_init(&pdata->name_attr.attr);
Durgadoss R199e0de2011-05-20 01:29:35 +0530339 pdata->name_attr.attr.name = "name";
340 pdata->name_attr.attr.mode = S_IRUGO;
341 pdata->name_attr.show = show_name;
342 return device_create_file(dev, &pdata->name_attr);
343}
344
345static int create_core_attrs(struct temp_data *tdata, struct device *dev,
346 int attr_no)
347{
348 int err, i;
349 static ssize_t (*rd_ptr[MAX_ATTRS]) (struct device *dev,
350 struct device_attribute *devattr, char *buf) = {
351 show_label, show_crit_alarm, show_ttarget,
352 show_temp, show_tjmax };
353 static const char *names[MAX_ATTRS] = {
354 "temp%d_label", "temp%d_crit_alarm",
355 "temp%d_max", "temp%d_input",
356 "temp%d_crit" };
357
358 for (i = 0; i < MAX_ATTRS; i++) {
359 snprintf(tdata->attr_name[i], CORETEMP_NAME_LENGTH, names[i],
360 attr_no);
Sergey Senozhatsky42587812011-05-24 07:28:31 -0400361 sysfs_attr_init(&tdata->sd_attrs[i].dev_attr.attr);
Durgadoss R199e0de2011-05-20 01:29:35 +0530362 tdata->sd_attrs[i].dev_attr.attr.name = tdata->attr_name[i];
363 tdata->sd_attrs[i].dev_attr.attr.mode = S_IRUGO;
364 tdata->sd_attrs[i].dev_attr.show = rd_ptr[i];
365 tdata->sd_attrs[i].dev_attr.store = NULL;
366 tdata->sd_attrs[i].index = attr_no;
367 err = device_create_file(dev, &tdata->sd_attrs[i].dev_attr);
368 if (err)
369 goto exit_free;
370 }
371 return 0;
372
373exit_free:
374 while (--i >= 0)
375 device_remove_file(dev, &tdata->sd_attrs[i].dev_attr);
376 return err;
377}
378
379static void update_ttarget(__u8 cpu_model, struct temp_data *tdata,
380 struct device *dev)
381{
Rudolf Marekbebe4672007-05-08 17:22:02 +0200382 int err;
383 u32 eax, edx;
384
Durgadoss R199e0de2011-05-20 01:29:35 +0530385 /*
386 * Initialize ttarget value. Eventually this will be
387 * initialized with the value from MSR_IA32_THERM_INTERRUPT
388 * register. If IA32_TEMPERATURE_TARGET is supported, this
389 * value will be over written below.
390 * To Do: Patch to initialize ttarget from MSR_IA32_THERM_INTERRUPT
391 */
392 tdata->ttarget = tdata->tjmax - 20000;
393
394 /*
395 * Read the still undocumented IA32_TEMPERATURE_TARGET. It exists
396 * on older CPUs but not in this register,
397 * Atoms don't have it either.
398 */
Guenter Roeck4cc45272011-05-19 14:45:48 -0700399 if (cpu_model > 0xe && cpu_model != 0x1c) {
Durgadoss R199e0de2011-05-20 01:29:35 +0530400 err = rdmsr_safe_on_cpu(tdata->cpu,
401 MSR_IA32_TEMPERATURE_TARGET, &eax, &edx);
402 if (err) {
403 dev_warn(dev,
404 "Unable to read IA32_TEMPERATURE_TARGET MSR\n");
405 } else {
406 tdata->ttarget = tdata->tjmax -
Guenter Roeck4cc45272011-05-19 14:45:48 -0700407 ((eax >> 8) & 0xff) * 1000;
Durgadoss R199e0de2011-05-20 01:29:35 +0530408 }
Rudolf Marekbebe4672007-05-08 17:22:02 +0200409 }
Durgadoss R199e0de2011-05-20 01:29:35 +0530410}
Rudolf Marekbebe4672007-05-08 17:22:02 +0200411
Jean Delvare582e1b22011-05-26 06:01:54 -0400412static int __devinit chk_ucode_version(struct platform_device *pdev)
Durgadoss R199e0de2011-05-20 01:29:35 +0530413{
414 struct cpuinfo_x86 *c = &cpu_data(pdev->id);
415 int err;
416 u32 edx;
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 */
Guenter Roeck4cc45272011-05-19 14:45:48 -0700423 if (c->x86_model == 0xe && c->x86_mask < 0xc) {
Rudolf Marek67f363b2007-05-27 22:17:43 +0200424 /* check for microcode update */
Durgadoss R199e0de2011-05-20 01:29:35 +0530425 err = smp_call_function_single(pdev->id, get_ucode_rev_on_cpu,
Jan Beulich32478002010-10-08 04:59:38 -0400426 &edx, 1);
427 if (err) {
428 dev_err(&pdev->dev,
429 "Cannot determine microcode revision of "
Durgadoss R199e0de2011-05-20 01:29:35 +0530430 "CPU#%u (%d)!\n", pdev->id, err);
431 return -ENODEV;
Jan Beulich32478002010-10-08 04:59:38 -0400432 } else if (edx < 0x39) {
Rudolf Marek67f363b2007-05-27 22:17:43 +0200433 dev_err(&pdev->dev,
434 "Errata AE18 not fixed, update BIOS or "
435 "microcode of the CPU!\n");
Durgadoss R199e0de2011-05-20 01:29:35 +0530436 return -ENODEV;
Rudolf Marek67f363b2007-05-27 22:17:43 +0200437 }
438 }
Durgadoss R199e0de2011-05-20 01:29:35 +0530439 return 0;
440}
Rudolf Marek67f363b2007-05-27 22:17:43 +0200441
Durgadoss R199e0de2011-05-20 01:29:35 +0530442static struct platform_device *coretemp_get_pdev(unsigned int cpu)
443{
444 u16 phys_proc_id = TO_PHYS_ID(cpu);
445 struct pdev_entry *p;
446
447 mutex_lock(&pdev_list_mutex);
448
449 list_for_each_entry(p, &pdev_list, list)
450 if (p->phys_proc_id == phys_proc_id) {
451 mutex_unlock(&pdev_list_mutex);
452 return p->pdev;
453 }
454
455 mutex_unlock(&pdev_list_mutex);
456 return NULL;
457}
458
459static struct temp_data *init_temp_data(unsigned int cpu, int pkg_flag)
460{
461 struct temp_data *tdata;
462
463 tdata = kzalloc(sizeof(struct temp_data), GFP_KERNEL);
464 if (!tdata)
465 return NULL;
466
467 tdata->status_reg = pkg_flag ? MSR_IA32_PACKAGE_THERM_STATUS :
468 MSR_IA32_THERM_STATUS;
469 tdata->is_pkg_data = pkg_flag;
470 tdata->cpu = cpu;
471 tdata->cpu_core_id = TO_CORE_ID(cpu);
472 mutex_init(&tdata->update_lock);
473 return tdata;
474}
475
476static int create_core_data(struct platform_data *pdata,
477 struct platform_device *pdev,
478 unsigned int cpu, int pkg_flag)
479{
480 struct temp_data *tdata;
481 struct cpuinfo_x86 *c = &cpu_data(cpu);
482 u32 eax, edx;
483 int err, attr_no;
Rudolf Marekbebe4672007-05-08 17:22:02 +0200484
Carsten Emdea321ced2010-05-24 14:33:41 -0700485 /*
Durgadoss R199e0de2011-05-20 01:29:35 +0530486 * Find attr number for sysfs:
487 * We map the attr number to core id of the CPU
488 * The attr number is always core id + 2
489 * The Pkgtemp will always show up as temp1_*, if available
Carsten Emdea321ced2010-05-24 14:33:41 -0700490 */
Durgadoss R199e0de2011-05-20 01:29:35 +0530491 attr_no = pkg_flag ? 1 : TO_ATTR_NO(cpu);
Rudolf Marek6369a2882008-01-18 00:42:54 +0100492
Durgadoss R199e0de2011-05-20 01:29:35 +0530493 if (attr_no > MAX_CORE_DATA - 1)
494 return -ERANGE;
Rudolf Marek6369a2882008-01-18 00:42:54 +0100495
Guenter Roeckf4e0bcf2011-05-23 14:05:38 -0700496 /*
497 * Provide a single set of attributes for all HT siblings of a core
498 * to avoid duplicate sensors (the processor ID and core ID of all
Guenter Roeck6777b9e2011-05-23 13:52:35 -0700499 * HT siblings of a core are the same).
500 * Skip if a HT sibling of this core is already registered.
Guenter Roeckf4e0bcf2011-05-23 14:05:38 -0700501 * This is not an error.
502 */
Durgadoss R199e0de2011-05-20 01:29:35 +0530503 if (pdata->core_data[attr_no] != NULL)
504 return 0;
Rudolf Marekbebe4672007-05-08 17:22:02 +0200505
Durgadoss R199e0de2011-05-20 01:29:35 +0530506 tdata = init_temp_data(cpu, pkg_flag);
507 if (!tdata)
508 return -ENOMEM;
509
510 /* Test if we can access the status register */
511 err = rdmsr_safe_on_cpu(cpu, tdata->status_reg, &eax, &edx);
512 if (err)
513 goto exit_free;
514
515 /* We can access status register. Get Critical Temperature */
516 if (pkg_flag)
517 tdata->tjmax = get_pkg_tjmax(pdev->id, &pdev->dev);
518 else
519 tdata->tjmax = get_tjmax(c, cpu, &pdev->dev);
520
521 update_ttarget(c->x86_model, tdata, &pdev->dev);
522 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:
Durgadoss R199e0de2011-05-20 01:29:35 +0530531 kfree(tdata);
532 return err;
533}
534
535static void coretemp_add_core(unsigned int cpu, int pkg_flag)
536{
537 struct platform_data *pdata;
538 struct platform_device *pdev = coretemp_get_pdev(cpu);
539 int err;
540
541 if (!pdev)
542 return;
543
544 pdata = platform_get_drvdata(pdev);
545
546 err = create_core_data(pdata, pdev, cpu, pkg_flag);
547 if (err)
548 dev_err(&pdev->dev, "Adding Core %u failed\n", cpu);
549}
550
551static void coretemp_remove_core(struct platform_data *pdata,
552 struct device *dev, int indx)
553{
554 int i;
555 struct temp_data *tdata = pdata->core_data[indx];
556
557 /* Remove the sysfs attributes */
558 for (i = 0; i < MAX_ATTRS; i++)
559 device_remove_file(dev, &tdata->sd_attrs[i].dev_attr);
560
561 kfree(pdata->core_data[indx]);
562 pdata->core_data[indx] = NULL;
563}
564
565static int __devinit coretemp_probe(struct platform_device *pdev)
566{
567 struct platform_data *pdata;
568 int err;
569
570 /* Check the microcode version of the CPU */
571 err = chk_ucode_version(pdev);
572 if (err)
573 return err;
574
575 /* Initialize the per-package data structures */
576 pdata = kzalloc(sizeof(struct platform_data), GFP_KERNEL);
577 if (!pdata)
578 return -ENOMEM;
579
580 err = create_name_attr(pdata, &pdev->dev);
581 if (err)
582 goto exit_free;
583
584 pdata->phys_proc_id = TO_PHYS_ID(pdev->id);
585 platform_set_drvdata(pdev, pdata);
586
587 pdata->hwmon_dev = hwmon_device_register(&pdev->dev);
588 if (IS_ERR(pdata->hwmon_dev)) {
589 err = PTR_ERR(pdata->hwmon_dev);
590 dev_err(&pdev->dev, "Class registration failed (%d)\n", err);
591 goto exit_name;
592 }
593 return 0;
594
595exit_name:
596 device_remove_file(&pdev->dev, &pdata->name_attr);
597 platform_set_drvdata(pdev, NULL);
598exit_free:
599 kfree(pdata);
Rudolf Marekbebe4672007-05-08 17:22:02 +0200600 return err;
601}
602
603static int __devexit coretemp_remove(struct platform_device *pdev)
604{
Durgadoss R199e0de2011-05-20 01:29:35 +0530605 struct platform_data *pdata = platform_get_drvdata(pdev);
606 int i;
Rudolf Marekbebe4672007-05-08 17:22:02 +0200607
Durgadoss R199e0de2011-05-20 01:29:35 +0530608 for (i = MAX_CORE_DATA - 1; i >= 0; --i)
609 if (pdata->core_data[i])
610 coretemp_remove_core(pdata, &pdev->dev, i);
611
612 device_remove_file(&pdev->dev, &pdata->name_attr);
613 hwmon_device_unregister(pdata->hwmon_dev);
Rudolf Marekbebe4672007-05-08 17:22:02 +0200614 platform_set_drvdata(pdev, NULL);
Durgadoss R199e0de2011-05-20 01:29:35 +0530615 kfree(pdata);
Rudolf Marekbebe4672007-05-08 17:22:02 +0200616 return 0;
617}
618
619static struct platform_driver coretemp_driver = {
620 .driver = {
621 .owner = THIS_MODULE,
622 .name = DRVNAME,
623 },
624 .probe = coretemp_probe,
625 .remove = __devexit_p(coretemp_remove),
626};
627
Rudolf Marekbebe4672007-05-08 17:22:02 +0200628static int __cpuinit coretemp_device_add(unsigned int cpu)
629{
630 int err;
631 struct platform_device *pdev;
632 struct pdev_entry *pdev_entry;
Jean Delvared883b9f2010-07-09 16:22:49 +0200633
634 mutex_lock(&pdev_list_mutex);
635
Rudolf Marekbebe4672007-05-08 17:22:02 +0200636 pdev = platform_device_alloc(DRVNAME, cpu);
637 if (!pdev) {
638 err = -ENOMEM;
Joe Perchesf8bb8922010-10-20 06:51:31 +0000639 pr_err("Device allocation failed\n");
Rudolf Marekbebe4672007-05-08 17:22:02 +0200640 goto exit;
641 }
642
643 pdev_entry = kzalloc(sizeof(struct pdev_entry), GFP_KERNEL);
644 if (!pdev_entry) {
645 err = -ENOMEM;
646 goto exit_device_put;
647 }
648
649 err = platform_device_add(pdev);
650 if (err) {
Joe Perchesf8bb8922010-10-20 06:51:31 +0000651 pr_err("Device addition failed (%d)\n", err);
Rudolf Marekbebe4672007-05-08 17:22:02 +0200652 goto exit_device_free;
653 }
654
655 pdev_entry->pdev = pdev;
656 pdev_entry->cpu = cpu;
Durgadoss R199e0de2011-05-20 01:29:35 +0530657 pdev_entry->phys_proc_id = TO_PHYS_ID(cpu);
658 pdev_entry->cpu_core_id = TO_CORE_ID(cpu);
659
Rudolf Marekbebe4672007-05-08 17:22:02 +0200660 list_add_tail(&pdev_entry->list, &pdev_list);
661 mutex_unlock(&pdev_list_mutex);
662
663 return 0;
664
665exit_device_free:
666 kfree(pdev_entry);
667exit_device_put:
668 platform_device_put(pdev);
669exit:
Jean Delvared883b9f2010-07-09 16:22:49 +0200670 mutex_unlock(&pdev_list_mutex);
Rudolf Marekbebe4672007-05-08 17:22:02 +0200671 return err;
672}
673
Durgadoss R199e0de2011-05-20 01:29:35 +0530674static void coretemp_device_remove(unsigned int cpu)
Rudolf Marekbebe4672007-05-08 17:22:02 +0200675{
Durgadoss R199e0de2011-05-20 01:29:35 +0530676 struct pdev_entry *p, *n;
677 u16 phys_proc_id = TO_PHYS_ID(cpu);
Jan Beuliche40cc4b2010-09-13 10:23:05 +0000678
Rudolf Marekbebe4672007-05-08 17:22:02 +0200679 mutex_lock(&pdev_list_mutex);
Durgadoss R199e0de2011-05-20 01:29:35 +0530680 list_for_each_entry_safe(p, n, &pdev_list, list) {
681 if (p->phys_proc_id != phys_proc_id)
Jan Beuliche40cc4b2010-09-13 10:23:05 +0000682 continue;
Jan Beuliche40cc4b2010-09-13 10:23:05 +0000683 platform_device_unregister(p->pdev);
684 list_del(&p->list);
Jan Beuliche40cc4b2010-09-13 10:23:05 +0000685 kfree(p);
Rudolf Marekbebe4672007-05-08 17:22:02 +0200686 }
687 mutex_unlock(&pdev_list_mutex);
688}
689
Durgadoss R199e0de2011-05-20 01:29:35 +0530690static bool is_any_core_online(struct platform_data *pdata)
691{
692 int i;
693
694 /* Find online cores, except pkgtemp data */
695 for (i = MAX_CORE_DATA - 1; i >= 0; --i) {
696 if (pdata->core_data[i] &&
697 !pdata->core_data[i]->is_pkg_data) {
698 return true;
699 }
700 }
701 return false;
702}
703
704static void __cpuinit get_core_online(unsigned int cpu)
705{
706 struct cpuinfo_x86 *c = &cpu_data(cpu);
707 struct platform_device *pdev = coretemp_get_pdev(cpu);
708 int err;
709
710 /*
711 * CPUID.06H.EAX[0] indicates whether the CPU has thermal
712 * sensors. We check this bit only, all the early CPUs
713 * without thermal sensors will be filtered out.
714 */
715 if (!cpu_has(c, X86_FEATURE_DTS))
716 return;
717
718 if (!pdev) {
719 /*
720 * Alright, we have DTS support.
721 * We are bringing the _first_ core in this pkg
722 * online. So, initialize per-pkg data structures and
723 * then bring this core online.
724 */
725 err = coretemp_device_add(cpu);
726 if (err)
727 return;
728 /*
729 * Check whether pkgtemp support is available.
730 * If so, add interfaces for pkgtemp.
731 */
732 if (cpu_has(c, X86_FEATURE_PTS))
733 coretemp_add_core(cpu, 1);
734 }
735 /*
736 * Physical CPU device already exists.
737 * So, just add interfaces for this core.
738 */
739 coretemp_add_core(cpu, 0);
740}
741
742static void __cpuinit put_core_offline(unsigned int cpu)
743{
744 int i, indx;
745 struct platform_data *pdata;
746 struct platform_device *pdev = coretemp_get_pdev(cpu);
747
748 /* If the physical CPU device does not exist, just return */
749 if (!pdev)
750 return;
751
752 pdata = platform_get_drvdata(pdev);
753
754 indx = TO_ATTR_NO(cpu);
755
756 if (pdata->core_data[indx] && pdata->core_data[indx]->cpu == cpu)
757 coretemp_remove_core(pdata, &pdev->dev, indx);
758
Guenter Roeckf4e0bcf2011-05-23 14:05:38 -0700759 /*
Guenter Roeck6777b9e2011-05-23 13:52:35 -0700760 * If a HT sibling of a core is taken offline, but another HT sibling
761 * of the same core is still online, register the alternate sibling.
762 * This ensures that exactly one set of attributes is provided as long
763 * as at least one HT sibling of a core is online.
Guenter Roeckf4e0bcf2011-05-23 14:05:38 -0700764 */
Guenter Roeckbb74e8c2011-05-23 12:06:41 -0700765 for_each_sibling(i, cpu) {
Durgadoss R199e0de2011-05-20 01:29:35 +0530766 if (i != cpu) {
767 get_core_online(i);
Guenter Roeckf4e0bcf2011-05-23 14:05:38 -0700768 /*
769 * Display temperature sensor data for one HT sibling
770 * per core only, so abort the loop after one such
771 * sibling has been found.
772 */
Durgadoss R199e0de2011-05-20 01:29:35 +0530773 break;
774 }
775 }
776 /*
777 * If all cores in this pkg are offline, remove the device.
778 * coretemp_device_remove calls unregister_platform_device,
779 * which in turn calls coretemp_remove. This removes the
780 * pkgtemp entry and does other clean ups.
781 */
782 if (!is_any_core_online(pdata))
783 coretemp_device_remove(cpu);
784}
785
Sam Ravnborgba7c1922008-02-17 13:22:51 +0100786static int __cpuinit coretemp_cpu_callback(struct notifier_block *nfb,
Rudolf Marekbebe4672007-05-08 17:22:02 +0200787 unsigned long action, void *hcpu)
788{
789 unsigned int cpu = (unsigned long) hcpu;
790
791 switch (action) {
792 case CPU_ONLINE:
Rafael J. Wysocki561d9a92007-12-03 18:01:50 +0100793 case CPU_DOWN_FAILED:
Durgadoss R199e0de2011-05-20 01:29:35 +0530794 get_core_online(cpu);
Rudolf Marekbebe4672007-05-08 17:22:02 +0200795 break;
Rafael J. Wysocki561d9a92007-12-03 18:01:50 +0100796 case CPU_DOWN_PREPARE:
Durgadoss R199e0de2011-05-20 01:29:35 +0530797 put_core_offline(cpu);
Rudolf Marekbebe4672007-05-08 17:22:02 +0200798 break;
799 }
800 return NOTIFY_OK;
801}
802
Sam Ravnborgba7c1922008-02-17 13:22:51 +0100803static struct notifier_block coretemp_cpu_notifier __refdata = {
Rudolf Marekbebe4672007-05-08 17:22:02 +0200804 .notifier_call = coretemp_cpu_callback,
805};
Rudolf Marekbebe4672007-05-08 17:22:02 +0200806
807static int __init coretemp_init(void)
808{
809 int i, err = -ENODEV;
Rudolf Marekbebe4672007-05-08 17:22:02 +0200810
Rudolf Marekbebe4672007-05-08 17:22:02 +0200811 /* quick check if we run Intel */
Mike Travis92cb7612007-10-19 20:35:04 +0200812 if (cpu_data(0).x86_vendor != X86_VENDOR_INTEL)
Rudolf Marekbebe4672007-05-08 17:22:02 +0200813 goto exit;
814
815 err = platform_driver_register(&coretemp_driver);
816 if (err)
817 goto exit;
818
Jan Beulicha4659052010-09-23 22:21:34 -0700819 for_each_online_cpu(i)
Durgadoss R199e0de2011-05-20 01:29:35 +0530820 get_core_online(i);
Jan Beulich89a3fd32010-09-13 10:05:51 +0000821
822#ifndef CONFIG_HOTPLUG_CPU
Rudolf Marekbebe4672007-05-08 17:22:02 +0200823 if (list_empty(&pdev_list)) {
824 err = -ENODEV;
825 goto exit_driver_unreg;
826 }
Jan Beulich89a3fd32010-09-13 10:05:51 +0000827#endif
Rudolf Marekbebe4672007-05-08 17:22:02 +0200828
Rudolf Marekbebe4672007-05-08 17:22:02 +0200829 register_hotcpu_notifier(&coretemp_cpu_notifier);
Rudolf Marekbebe4672007-05-08 17:22:02 +0200830 return 0;
831
Chen Gong0dca94b2010-08-09 17:21:09 -0700832#ifndef CONFIG_HOTPLUG_CPU
Jan Beulich89a3fd32010-09-13 10:05:51 +0000833exit_driver_unreg:
Rudolf Marekbebe4672007-05-08 17:22:02 +0200834 platform_driver_unregister(&coretemp_driver);
Chen Gong0dca94b2010-08-09 17:21:09 -0700835#endif
Rudolf Marekbebe4672007-05-08 17:22:02 +0200836exit:
837 return err;
838}
839
840static void __exit coretemp_exit(void)
841{
842 struct pdev_entry *p, *n;
Chen Gong17c10d62010-10-08 22:01:48 -0400843
Rudolf Marekbebe4672007-05-08 17:22:02 +0200844 unregister_hotcpu_notifier(&coretemp_cpu_notifier);
Rudolf Marekbebe4672007-05-08 17:22:02 +0200845 mutex_lock(&pdev_list_mutex);
846 list_for_each_entry_safe(p, n, &pdev_list, list) {
847 platform_device_unregister(p->pdev);
848 list_del(&p->list);
849 kfree(p);
850 }
851 mutex_unlock(&pdev_list_mutex);
852 platform_driver_unregister(&coretemp_driver);
853}
854
855MODULE_AUTHOR("Rudolf Marek <r.marek@assembler.cz>");
856MODULE_DESCRIPTION("Intel Core temperature monitor");
857MODULE_LICENSE("GPL");
858
859module_init(coretemp_init)
860module_exit(coretemp_exit)