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bebe4678 RM |
1 | /* |
2 | * coretemp.c - Linux kernel module for hardware monitoring | |
3 | * | |
4 | * Copyright (C) 2007 Rudolf Marek <r.marek@assembler.cz> | |
5 | * | |
6 | * Inspired from many hwmon drivers | |
7 | * | |
8 | * This program is free software; you can redistribute it and/or modify | |
9 | * it under the terms of the GNU General Public License as published by | |
10 | * the Free Software Foundation; version 2 of the License. | |
11 | * | |
12 | * This program is distributed in the hope that it will be useful, | |
13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
15 | * GNU General Public License for more details. | |
16 | * | |
17 | * You should have received a copy of the GNU General Public License | |
18 | * along with this program; if not, write to the Free Software | |
19 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA | |
20 | * 02110-1301 USA. | |
21 | */ | |
22 | ||
f8bb8925 JP |
23 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
24 | ||
bebe4678 | 25 | #include <linux/module.h> |
bebe4678 RM |
26 | #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> | |
1fe63ab4 | 37 | #include <linux/pci.h> |
4cc45275 | 38 | #include <linux/smp.h> |
a45a8c85 | 39 | #include <linux/moduleparam.h> |
bebe4678 RM |
40 | #include <asm/msr.h> |
41 | #include <asm/processor.h> | |
9b38096f | 42 | #include <asm/cpu_device_id.h> |
bebe4678 RM |
43 | |
44 | #define DRVNAME "coretemp" | |
45 | ||
a45a8c85 JD |
46 | /* |
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 | */ | |
50 | static int force_tjmax; | |
51 | module_param_named(tjmax, force_tjmax, int, 0444); | |
52 | MODULE_PARM_DESC(tjmax, "TjMax value in degrees Celsius"); | |
53 | ||
199e0de7 | 54 | #define BASE_SYSFS_ATTR_NO 2 /* Sysfs Base attr no for coretemp */ |
bdc71c9a | 55 | #define NUM_REAL_CORES 32 /* Number of Real cores per cpu */ |
199e0de7 | 56 | #define CORETEMP_NAME_LENGTH 17 /* String Length of attrs */ |
c814a4c7 | 57 | #define MAX_CORE_ATTRS 4 /* Maximum no of basic attrs */ |
f4af6fd6 | 58 | #define TOTAL_ATTRS (MAX_CORE_ATTRS + 1) |
199e0de7 D |
59 | #define MAX_CORE_DATA (NUM_REAL_CORES + BASE_SYSFS_ATTR_NO) |
60 | ||
780affe0 GR |
61 | #define TO_PHYS_ID(cpu) (cpu_data(cpu).phys_proc_id) |
62 | #define TO_CORE_ID(cpu) (cpu_data(cpu).cpu_core_id) | |
141168c3 KW |
63 | #define TO_ATTR_NO(cpu) (TO_CORE_ID(cpu) + BASE_SYSFS_ATTR_NO) |
64 | ||
65 | #ifdef CONFIG_SMP | |
bb74e8ca | 66 | #define for_each_sibling(i, cpu) for_each_cpu(i, cpu_sibling_mask(cpu)) |
199e0de7 | 67 | #else |
bb74e8ca | 68 | #define for_each_sibling(i, cpu) for (i = 0; false; ) |
199e0de7 | 69 | #endif |
bebe4678 RM |
70 | |
71 | /* | |
199e0de7 D |
72 | * Per-Core Temperature Data |
73 | * @last_updated: The time when the current temperature value was updated | |
74 | * earlier (in jiffies). | |
75 | * @cpu_core_id: The CPU Core from which temperature values should be read | |
76 | * This value is passed as "id" field to rdmsr/wrmsr functions. | |
77 | * @status_reg: One of IA32_THERM_STATUS or IA32_PACKAGE_THERM_STATUS, | |
78 | * from where the temperature values should be read. | |
c814a4c7 | 79 | * @attr_size: Total number of pre-core attrs displayed in the sysfs. |
199e0de7 D |
80 | * @is_pkg_data: If this is 1, the temp_data holds pkgtemp data. |
81 | * Otherwise, temp_data holds coretemp data. | |
82 | * @valid: If this is 1, the current temperature is valid. | |
bebe4678 | 83 | */ |
199e0de7 | 84 | struct temp_data { |
bebe4678 | 85 | int temp; |
6369a288 | 86 | int ttarget; |
199e0de7 D |
87 | int tjmax; |
88 | unsigned long last_updated; | |
89 | unsigned int cpu; | |
90 | u32 cpu_core_id; | |
91 | u32 status_reg; | |
c814a4c7 | 92 | int attr_size; |
199e0de7 D |
93 | bool is_pkg_data; |
94 | bool valid; | |
c814a4c7 D |
95 | struct sensor_device_attribute sd_attrs[TOTAL_ATTRS]; |
96 | char attr_name[TOTAL_ATTRS][CORETEMP_NAME_LENGTH]; | |
199e0de7 | 97 | struct mutex update_lock; |
bebe4678 RM |
98 | }; |
99 | ||
199e0de7 D |
100 | /* Platform Data per Physical CPU */ |
101 | struct platform_data { | |
102 | struct device *hwmon_dev; | |
103 | u16 phys_proc_id; | |
104 | struct temp_data *core_data[MAX_CORE_DATA]; | |
105 | struct device_attribute name_attr; | |
106 | }; | |
bebe4678 | 107 | |
199e0de7 D |
108 | struct pdev_entry { |
109 | struct list_head list; | |
110 | struct platform_device *pdev; | |
199e0de7 | 111 | u16 phys_proc_id; |
199e0de7 D |
112 | }; |
113 | ||
114 | static LIST_HEAD(pdev_list); | |
115 | static DEFINE_MUTEX(pdev_list_mutex); | |
116 | ||
117 | static ssize_t show_name(struct device *dev, | |
118 | struct device_attribute *devattr, char *buf) | |
119 | { | |
120 | return sprintf(buf, "%s\n", DRVNAME); | |
121 | } | |
122 | ||
123 | static ssize_t show_label(struct device *dev, | |
124 | struct device_attribute *devattr, char *buf) | |
bebe4678 | 125 | { |
bebe4678 | 126 | struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); |
199e0de7 D |
127 | struct platform_data *pdata = dev_get_drvdata(dev); |
128 | struct temp_data *tdata = pdata->core_data[attr->index]; | |
129 | ||
130 | if (tdata->is_pkg_data) | |
131 | return sprintf(buf, "Physical id %u\n", pdata->phys_proc_id); | |
bebe4678 | 132 | |
199e0de7 | 133 | return sprintf(buf, "Core %u\n", tdata->cpu_core_id); |
bebe4678 RM |
134 | } |
135 | ||
199e0de7 D |
136 | static ssize_t show_crit_alarm(struct device *dev, |
137 | struct device_attribute *devattr, char *buf) | |
bebe4678 | 138 | { |
199e0de7 D |
139 | u32 eax, edx; |
140 | struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); | |
141 | struct platform_data *pdata = dev_get_drvdata(dev); | |
142 | struct temp_data *tdata = pdata->core_data[attr->index]; | |
143 | ||
144 | rdmsr_on_cpu(tdata->cpu, tdata->status_reg, &eax, &edx); | |
145 | ||
146 | return sprintf(buf, "%d\n", (eax >> 5) & 1); | |
bebe4678 RM |
147 | } |
148 | ||
199e0de7 D |
149 | static ssize_t show_tjmax(struct device *dev, |
150 | struct device_attribute *devattr, char *buf) | |
bebe4678 RM |
151 | { |
152 | struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); | |
199e0de7 | 153 | struct platform_data *pdata = dev_get_drvdata(dev); |
bebe4678 | 154 | |
199e0de7 | 155 | return sprintf(buf, "%d\n", pdata->core_data[attr->index]->tjmax); |
bebe4678 RM |
156 | } |
157 | ||
199e0de7 D |
158 | static ssize_t show_ttarget(struct device *dev, |
159 | struct device_attribute *devattr, char *buf) | |
160 | { | |
161 | struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); | |
162 | struct platform_data *pdata = dev_get_drvdata(dev); | |
bebe4678 | 163 | |
199e0de7 D |
164 | return sprintf(buf, "%d\n", pdata->core_data[attr->index]->ttarget); |
165 | } | |
bebe4678 | 166 | |
199e0de7 D |
167 | static ssize_t show_temp(struct device *dev, |
168 | struct device_attribute *devattr, char *buf) | |
bebe4678 | 169 | { |
199e0de7 D |
170 | u32 eax, edx; |
171 | struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); | |
172 | struct platform_data *pdata = dev_get_drvdata(dev); | |
173 | struct temp_data *tdata = pdata->core_data[attr->index]; | |
bebe4678 | 174 | |
199e0de7 | 175 | mutex_lock(&tdata->update_lock); |
bebe4678 | 176 | |
199e0de7 D |
177 | /* Check whether the time interval has elapsed */ |
178 | if (!tdata->valid || time_after(jiffies, tdata->last_updated + HZ)) { | |
179 | rdmsr_on_cpu(tdata->cpu, tdata->status_reg, &eax, &edx); | |
180 | tdata->valid = 0; | |
181 | /* Check whether the data is valid */ | |
bebe4678 | 182 | if (eax & 0x80000000) { |
199e0de7 | 183 | tdata->temp = tdata->tjmax - |
4cc45275 | 184 | ((eax >> 16) & 0x7f) * 1000; |
199e0de7 | 185 | tdata->valid = 1; |
bebe4678 | 186 | } |
199e0de7 | 187 | tdata->last_updated = jiffies; |
bebe4678 RM |
188 | } |
189 | ||
199e0de7 D |
190 | mutex_unlock(&tdata->update_lock); |
191 | return tdata->valid ? sprintf(buf, "%d\n", tdata->temp) : -EAGAIN; | |
bebe4678 RM |
192 | } |
193 | ||
41e58a1f GR |
194 | struct tjmax { |
195 | char const *id; | |
196 | int tjmax; | |
197 | }; | |
198 | ||
64f50307 | 199 | static const struct tjmax __cpuinitconst tjmax_table[] = { |
41e58a1f GR |
200 | { "CPU D410", 100000 }, |
201 | { "CPU D425", 100000 }, | |
202 | { "CPU D510", 100000 }, | |
203 | { "CPU D525", 100000 }, | |
204 | { "CPU N450", 100000 }, | |
205 | { "CPU N455", 100000 }, | |
206 | { "CPU N470", 100000 }, | |
207 | { "CPU N475", 100000 }, | |
208 | { "CPU 230", 100000 }, | |
209 | { "CPU 330", 125000 }, | |
210 | }; | |
211 | ||
d6db23c7 JD |
212 | static int __cpuinit adjust_tjmax(struct cpuinfo_x86 *c, u32 id, |
213 | struct device *dev) | |
118a8871 RM |
214 | { |
215 | /* The 100C is default for both mobile and non mobile CPUs */ | |
216 | ||
217 | int tjmax = 100000; | |
eccfed42 | 218 | int tjmax_ee = 85000; |
708a62bc | 219 | int usemsr_ee = 1; |
118a8871 RM |
220 | int err; |
221 | u32 eax, edx; | |
1fe63ab4 | 222 | struct pci_dev *host_bridge; |
41e58a1f GR |
223 | int i; |
224 | ||
225 | /* explicit tjmax table entries override heuristics */ | |
226 | for (i = 0; i < ARRAY_SIZE(tjmax_table); i++) { | |
227 | if (strstr(c->x86_model_id, tjmax_table[i].id)) | |
228 | return tjmax_table[i].tjmax; | |
229 | } | |
118a8871 RM |
230 | |
231 | /* Early chips have no MSR for TjMax */ | |
232 | ||
4cc45275 | 233 | if (c->x86_model == 0xf && c->x86_mask < 4) |
708a62bc | 234 | usemsr_ee = 0; |
118a8871 | 235 | |
1fe63ab4 | 236 | /* Atom CPUs */ |
708a62bc | 237 | |
fcc14ac1 JD |
238 | if (c->x86_model == 0x1c || c->x86_model == 0x26 |
239 | || c->x86_model == 0x27) { | |
708a62bc | 240 | usemsr_ee = 0; |
1fe63ab4 YW |
241 | |
242 | host_bridge = pci_get_bus_and_slot(0, PCI_DEVFN(0, 0)); | |
243 | ||
244 | if (host_bridge && host_bridge->vendor == PCI_VENDOR_ID_INTEL | |
245 | && (host_bridge->device == 0xa000 /* NM10 based nettop */ | |
246 | || host_bridge->device == 0xa010)) /* NM10 based netbook */ | |
247 | tjmax = 100000; | |
248 | else | |
249 | tjmax = 90000; | |
250 | ||
251 | pci_dev_put(host_bridge); | |
5592906f GR |
252 | } else if (c->x86_model == 0x36) { |
253 | usemsr_ee = 0; | |
254 | tjmax = 100000; | |
708a62bc RM |
255 | } |
256 | ||
4cc45275 | 257 | if (c->x86_model > 0xe && usemsr_ee) { |
eccfed42 | 258 | u8 platform_id; |
118a8871 | 259 | |
4cc45275 GR |
260 | /* |
261 | * Now we can detect the mobile CPU using Intel provided table | |
262 | * http://softwarecommunity.intel.com/Wiki/Mobility/720.htm | |
263 | * For Core2 cores, check MSR 0x17, bit 28 1 = Mobile CPU | |
264 | */ | |
118a8871 RM |
265 | err = rdmsr_safe_on_cpu(id, 0x17, &eax, &edx); |
266 | if (err) { | |
267 | dev_warn(dev, | |
268 | "Unable to access MSR 0x17, assuming desktop" | |
269 | " CPU\n"); | |
708a62bc | 270 | usemsr_ee = 0; |
eccfed42 | 271 | } else if (c->x86_model < 0x17 && !(eax & 0x10000000)) { |
4cc45275 GR |
272 | /* |
273 | * Trust bit 28 up to Penryn, I could not find any | |
274 | * documentation on that; if you happen to know | |
275 | * someone at Intel please ask | |
276 | */ | |
708a62bc | 277 | usemsr_ee = 0; |
eccfed42 RM |
278 | } else { |
279 | /* Platform ID bits 52:50 (EDX starts at bit 32) */ | |
280 | platform_id = (edx >> 18) & 0x7; | |
281 | ||
4cc45275 GR |
282 | /* |
283 | * Mobile Penryn CPU seems to be platform ID 7 or 5 | |
284 | * (guesswork) | |
285 | */ | |
286 | if (c->x86_model == 0x17 && | |
287 | (platform_id == 5 || platform_id == 7)) { | |
288 | /* | |
289 | * If MSR EE bit is set, set it to 90 degrees C, | |
290 | * otherwise 105 degrees C | |
291 | */ | |
eccfed42 RM |
292 | tjmax_ee = 90000; |
293 | tjmax = 105000; | |
294 | } | |
118a8871 RM |
295 | } |
296 | } | |
297 | ||
708a62bc | 298 | if (usemsr_ee) { |
118a8871 RM |
299 | err = rdmsr_safe_on_cpu(id, 0xee, &eax, &edx); |
300 | if (err) { | |
301 | dev_warn(dev, | |
302 | "Unable to access MSR 0xEE, for Tjmax, left" | |
4d7a5644 | 303 | " at default\n"); |
118a8871 | 304 | } else if (eax & 0x40000000) { |
eccfed42 | 305 | tjmax = tjmax_ee; |
118a8871 | 306 | } |
708a62bc | 307 | } else if (tjmax == 100000) { |
4cc45275 GR |
308 | /* |
309 | * If we don't use msr EE it means we are desktop CPU | |
310 | * (with exeception of Atom) | |
311 | */ | |
118a8871 RM |
312 | dev_warn(dev, "Using relative temperature scale!\n"); |
313 | } | |
314 | ||
315 | return tjmax; | |
316 | } | |
317 | ||
d6db23c7 JD |
318 | static int __cpuinit get_tjmax(struct cpuinfo_x86 *c, u32 id, |
319 | struct device *dev) | |
a321cedb | 320 | { |
a321cedb CE |
321 | int err; |
322 | u32 eax, edx; | |
323 | u32 val; | |
324 | ||
4cc45275 GR |
325 | /* |
326 | * A new feature of current Intel(R) processors, the | |
327 | * IA32_TEMPERATURE_TARGET contains the TjMax value | |
328 | */ | |
a321cedb CE |
329 | err = rdmsr_safe_on_cpu(id, MSR_IA32_TEMPERATURE_TARGET, &eax, &edx); |
330 | if (err) { | |
6bf9e9b0 JD |
331 | if (c->x86_model > 0xe && c->x86_model != 0x1c) |
332 | dev_warn(dev, "Unable to read TjMax from CPU %u\n", id); | |
a321cedb CE |
333 | } else { |
334 | val = (eax >> 16) & 0xff; | |
335 | /* | |
336 | * If the TjMax is not plausible, an assumption | |
337 | * will be used | |
338 | */ | |
bb9973e4 | 339 | if (val) { |
6bf9e9b0 | 340 | dev_dbg(dev, "TjMax is %d degrees C\n", val); |
a321cedb CE |
341 | return val * 1000; |
342 | } | |
343 | } | |
344 | ||
a45a8c85 JD |
345 | if (force_tjmax) { |
346 | dev_notice(dev, "TjMax forced to %d degrees C by user\n", | |
347 | force_tjmax); | |
348 | return force_tjmax * 1000; | |
349 | } | |
350 | ||
a321cedb CE |
351 | /* |
352 | * An assumption is made for early CPUs and unreadable MSR. | |
4f5f71a7 | 353 | * NOTE: the calculated value may not be correct. |
a321cedb | 354 | */ |
4f5f71a7 | 355 | return adjust_tjmax(c, id, dev); |
a321cedb CE |
356 | } |
357 | ||
d6db23c7 JD |
358 | static int __devinit create_name_attr(struct platform_data *pdata, |
359 | struct device *dev) | |
199e0de7 | 360 | { |
4258781a | 361 | sysfs_attr_init(&pdata->name_attr.attr); |
199e0de7 D |
362 | pdata->name_attr.attr.name = "name"; |
363 | pdata->name_attr.attr.mode = S_IRUGO; | |
364 | pdata->name_attr.show = show_name; | |
365 | return device_create_file(dev, &pdata->name_attr); | |
366 | } | |
bebe4678 | 367 | |
d6db23c7 JD |
368 | static int __cpuinit create_core_attrs(struct temp_data *tdata, |
369 | struct device *dev, int attr_no) | |
199e0de7 D |
370 | { |
371 | int err, i; | |
e3204ed3 | 372 | static ssize_t (*const rd_ptr[TOTAL_ATTRS]) (struct device *dev, |
199e0de7 | 373 | struct device_attribute *devattr, char *buf) = { |
c814a4c7 | 374 | show_label, show_crit_alarm, show_temp, show_tjmax, |
f4af6fd6 | 375 | show_ttarget }; |
e3204ed3 | 376 | static const char *const names[TOTAL_ATTRS] = { |
199e0de7 | 377 | "temp%d_label", "temp%d_crit_alarm", |
c814a4c7 | 378 | "temp%d_input", "temp%d_crit", |
f4af6fd6 | 379 | "temp%d_max" }; |
199e0de7 | 380 | |
c814a4c7 | 381 | for (i = 0; i < tdata->attr_size; i++) { |
199e0de7 D |
382 | snprintf(tdata->attr_name[i], CORETEMP_NAME_LENGTH, names[i], |
383 | attr_no); | |
4258781a | 384 | sysfs_attr_init(&tdata->sd_attrs[i].dev_attr.attr); |
199e0de7 D |
385 | tdata->sd_attrs[i].dev_attr.attr.name = tdata->attr_name[i]; |
386 | tdata->sd_attrs[i].dev_attr.attr.mode = S_IRUGO; | |
387 | tdata->sd_attrs[i].dev_attr.show = rd_ptr[i]; | |
199e0de7 D |
388 | tdata->sd_attrs[i].index = attr_no; |
389 | err = device_create_file(dev, &tdata->sd_attrs[i].dev_attr); | |
390 | if (err) | |
391 | goto exit_free; | |
bebe4678 | 392 | } |
199e0de7 D |
393 | return 0; |
394 | ||
395 | exit_free: | |
396 | while (--i >= 0) | |
397 | device_remove_file(dev, &tdata->sd_attrs[i].dev_attr); | |
398 | return err; | |
399 | } | |
400 | ||
199e0de7 | 401 | |
0eb9782a | 402 | static int __cpuinit chk_ucode_version(unsigned int cpu) |
199e0de7 | 403 | { |
0eb9782a | 404 | struct cpuinfo_x86 *c = &cpu_data(cpu); |
67f363b1 | 405 | |
199e0de7 D |
406 | /* |
407 | * Check if we have problem with errata AE18 of Core processors: | |
408 | * Readings might stop update when processor visited too deep sleep, | |
409 | * fixed for stepping D0 (6EC). | |
410 | */ | |
ca8bc8dc AK |
411 | if (c->x86_model == 0xe && c->x86_mask < 0xc && c->microcode < 0x39) { |
412 | pr_err("Errata AE18 not fixed, update BIOS or " | |
413 | "microcode of the CPU!\n"); | |
414 | return -ENODEV; | |
67f363b1 | 415 | } |
199e0de7 D |
416 | return 0; |
417 | } | |
418 | ||
d6db23c7 | 419 | static struct platform_device __cpuinit *coretemp_get_pdev(unsigned int cpu) |
199e0de7 D |
420 | { |
421 | u16 phys_proc_id = TO_PHYS_ID(cpu); | |
422 | struct pdev_entry *p; | |
423 | ||
424 | mutex_lock(&pdev_list_mutex); | |
425 | ||
426 | list_for_each_entry(p, &pdev_list, list) | |
427 | if (p->phys_proc_id == phys_proc_id) { | |
428 | mutex_unlock(&pdev_list_mutex); | |
429 | return p->pdev; | |
430 | } | |
431 | ||
432 | mutex_unlock(&pdev_list_mutex); | |
433 | return NULL; | |
434 | } | |
435 | ||
d6db23c7 JD |
436 | static struct temp_data __cpuinit *init_temp_data(unsigned int cpu, |
437 | int pkg_flag) | |
199e0de7 D |
438 | { |
439 | struct temp_data *tdata; | |
440 | ||
441 | tdata = kzalloc(sizeof(struct temp_data), GFP_KERNEL); | |
442 | if (!tdata) | |
443 | return NULL; | |
444 | ||
445 | tdata->status_reg = pkg_flag ? MSR_IA32_PACKAGE_THERM_STATUS : | |
446 | MSR_IA32_THERM_STATUS; | |
447 | tdata->is_pkg_data = pkg_flag; | |
448 | tdata->cpu = cpu; | |
449 | tdata->cpu_core_id = TO_CORE_ID(cpu); | |
c814a4c7 | 450 | tdata->attr_size = MAX_CORE_ATTRS; |
199e0de7 D |
451 | mutex_init(&tdata->update_lock); |
452 | return tdata; | |
453 | } | |
67f363b1 | 454 | |
d6db23c7 | 455 | static int __cpuinit create_core_data(struct platform_device *pdev, |
199e0de7 D |
456 | unsigned int cpu, int pkg_flag) |
457 | { | |
458 | struct temp_data *tdata; | |
2f1c3db0 | 459 | struct platform_data *pdata = platform_get_drvdata(pdev); |
199e0de7 D |
460 | struct cpuinfo_x86 *c = &cpu_data(cpu); |
461 | u32 eax, edx; | |
462 | int err, attr_no; | |
bebe4678 | 463 | |
a321cedb | 464 | /* |
199e0de7 D |
465 | * Find attr number for sysfs: |
466 | * We map the attr number to core id of the CPU | |
467 | * The attr number is always core id + 2 | |
468 | * The Pkgtemp will always show up as temp1_*, if available | |
a321cedb | 469 | */ |
199e0de7 | 470 | attr_no = pkg_flag ? 1 : TO_ATTR_NO(cpu); |
6369a288 | 471 | |
199e0de7 D |
472 | if (attr_no > MAX_CORE_DATA - 1) |
473 | return -ERANGE; | |
474 | ||
f4e0bcf0 GR |
475 | /* |
476 | * Provide a single set of attributes for all HT siblings of a core | |
477 | * to avoid duplicate sensors (the processor ID and core ID of all | |
6777b9e4 GR |
478 | * HT siblings of a core are the same). |
479 | * Skip if a HT sibling of this core is already registered. | |
f4e0bcf0 GR |
480 | * This is not an error. |
481 | */ | |
199e0de7 D |
482 | if (pdata->core_data[attr_no] != NULL) |
483 | return 0; | |
6369a288 | 484 | |
199e0de7 D |
485 | tdata = init_temp_data(cpu, pkg_flag); |
486 | if (!tdata) | |
487 | return -ENOMEM; | |
bebe4678 | 488 | |
199e0de7 D |
489 | /* Test if we can access the status register */ |
490 | err = rdmsr_safe_on_cpu(cpu, tdata->status_reg, &eax, &edx); | |
491 | if (err) | |
492 | goto exit_free; | |
493 | ||
494 | /* We can access status register. Get Critical Temperature */ | |
6bf9e9b0 | 495 | tdata->tjmax = get_tjmax(c, cpu, &pdev->dev); |
199e0de7 | 496 | |
c814a4c7 | 497 | /* |
f4af6fd6 GR |
498 | * Read the still undocumented bits 8:15 of IA32_TEMPERATURE_TARGET. |
499 | * The target temperature is available on older CPUs but not in this | |
500 | * register. Atoms don't have the register at all. | |
c814a4c7 | 501 | */ |
f4af6fd6 GR |
502 | if (c->x86_model > 0xe && c->x86_model != 0x1c) { |
503 | err = rdmsr_safe_on_cpu(cpu, MSR_IA32_TEMPERATURE_TARGET, | |
504 | &eax, &edx); | |
505 | if (!err) { | |
506 | tdata->ttarget | |
507 | = tdata->tjmax - ((eax >> 8) & 0xff) * 1000; | |
508 | tdata->attr_size++; | |
509 | } | |
c814a4c7 D |
510 | } |
511 | ||
199e0de7 D |
512 | pdata->core_data[attr_no] = tdata; |
513 | ||
514 | /* Create sysfs interfaces */ | |
515 | err = create_core_attrs(tdata, &pdev->dev, attr_no); | |
516 | if (err) | |
517 | goto exit_free; | |
bebe4678 RM |
518 | |
519 | return 0; | |
199e0de7 | 520 | exit_free: |
20ecb499 | 521 | pdata->core_data[attr_no] = NULL; |
199e0de7 D |
522 | kfree(tdata); |
523 | return err; | |
524 | } | |
525 | ||
d6db23c7 | 526 | static void __cpuinit coretemp_add_core(unsigned int cpu, int pkg_flag) |
199e0de7 | 527 | { |
199e0de7 D |
528 | struct platform_device *pdev = coretemp_get_pdev(cpu); |
529 | int err; | |
530 | ||
531 | if (!pdev) | |
532 | return; | |
533 | ||
2f1c3db0 | 534 | err = create_core_data(pdev, cpu, pkg_flag); |
199e0de7 D |
535 | if (err) |
536 | dev_err(&pdev->dev, "Adding Core %u failed\n", cpu); | |
537 | } | |
538 | ||
539 | static void coretemp_remove_core(struct platform_data *pdata, | |
540 | struct device *dev, int indx) | |
541 | { | |
542 | int i; | |
543 | struct temp_data *tdata = pdata->core_data[indx]; | |
544 | ||
545 | /* Remove the sysfs attributes */ | |
c814a4c7 | 546 | for (i = 0; i < tdata->attr_size; i++) |
199e0de7 D |
547 | device_remove_file(dev, &tdata->sd_attrs[i].dev_attr); |
548 | ||
549 | kfree(pdata->core_data[indx]); | |
550 | pdata->core_data[indx] = NULL; | |
551 | } | |
552 | ||
553 | static int __devinit coretemp_probe(struct platform_device *pdev) | |
554 | { | |
555 | struct platform_data *pdata; | |
556 | int err; | |
bebe4678 | 557 | |
199e0de7 D |
558 | /* Initialize the per-package data structures */ |
559 | pdata = kzalloc(sizeof(struct platform_data), GFP_KERNEL); | |
560 | if (!pdata) | |
561 | return -ENOMEM; | |
562 | ||
563 | err = create_name_attr(pdata, &pdev->dev); | |
564 | if (err) | |
565 | goto exit_free; | |
566 | ||
b3a242a6 | 567 | pdata->phys_proc_id = pdev->id; |
199e0de7 D |
568 | platform_set_drvdata(pdev, pdata); |
569 | ||
570 | pdata->hwmon_dev = hwmon_device_register(&pdev->dev); | |
571 | if (IS_ERR(pdata->hwmon_dev)) { | |
572 | err = PTR_ERR(pdata->hwmon_dev); | |
573 | dev_err(&pdev->dev, "Class registration failed (%d)\n", err); | |
574 | goto exit_name; | |
575 | } | |
576 | return 0; | |
577 | ||
578 | exit_name: | |
579 | device_remove_file(&pdev->dev, &pdata->name_attr); | |
580 | platform_set_drvdata(pdev, NULL); | |
bebe4678 | 581 | exit_free: |
199e0de7 | 582 | kfree(pdata); |
bebe4678 RM |
583 | return err; |
584 | } | |
585 | ||
586 | static int __devexit coretemp_remove(struct platform_device *pdev) | |
587 | { | |
199e0de7 D |
588 | struct platform_data *pdata = platform_get_drvdata(pdev); |
589 | int i; | |
bebe4678 | 590 | |
199e0de7 D |
591 | for (i = MAX_CORE_DATA - 1; i >= 0; --i) |
592 | if (pdata->core_data[i]) | |
593 | coretemp_remove_core(pdata, &pdev->dev, i); | |
594 | ||
595 | device_remove_file(&pdev->dev, &pdata->name_attr); | |
596 | hwmon_device_unregister(pdata->hwmon_dev); | |
bebe4678 | 597 | platform_set_drvdata(pdev, NULL); |
199e0de7 | 598 | kfree(pdata); |
bebe4678 RM |
599 | return 0; |
600 | } | |
601 | ||
602 | static struct platform_driver coretemp_driver = { | |
603 | .driver = { | |
604 | .owner = THIS_MODULE, | |
605 | .name = DRVNAME, | |
606 | }, | |
607 | .probe = coretemp_probe, | |
608 | .remove = __devexit_p(coretemp_remove), | |
609 | }; | |
610 | ||
bebe4678 RM |
611 | static int __cpuinit coretemp_device_add(unsigned int cpu) |
612 | { | |
613 | int err; | |
614 | struct platform_device *pdev; | |
615 | struct pdev_entry *pdev_entry; | |
d883b9f0 JD |
616 | |
617 | mutex_lock(&pdev_list_mutex); | |
618 | ||
b3a242a6 | 619 | pdev = platform_device_alloc(DRVNAME, TO_PHYS_ID(cpu)); |
bebe4678 RM |
620 | if (!pdev) { |
621 | err = -ENOMEM; | |
f8bb8925 | 622 | pr_err("Device allocation failed\n"); |
bebe4678 RM |
623 | goto exit; |
624 | } | |
625 | ||
626 | pdev_entry = kzalloc(sizeof(struct pdev_entry), GFP_KERNEL); | |
627 | if (!pdev_entry) { | |
628 | err = -ENOMEM; | |
629 | goto exit_device_put; | |
630 | } | |
631 | ||
632 | err = platform_device_add(pdev); | |
633 | if (err) { | |
f8bb8925 | 634 | pr_err("Device addition failed (%d)\n", err); |
bebe4678 RM |
635 | goto exit_device_free; |
636 | } | |
637 | ||
638 | pdev_entry->pdev = pdev; | |
0eb9782a | 639 | pdev_entry->phys_proc_id = pdev->id; |
199e0de7 | 640 | |
bebe4678 RM |
641 | list_add_tail(&pdev_entry->list, &pdev_list); |
642 | mutex_unlock(&pdev_list_mutex); | |
643 | ||
644 | return 0; | |
645 | ||
646 | exit_device_free: | |
647 | kfree(pdev_entry); | |
648 | exit_device_put: | |
649 | platform_device_put(pdev); | |
650 | exit: | |
d883b9f0 | 651 | mutex_unlock(&pdev_list_mutex); |
bebe4678 RM |
652 | return err; |
653 | } | |
654 | ||
d6db23c7 | 655 | static void __cpuinit coretemp_device_remove(unsigned int cpu) |
bebe4678 | 656 | { |
199e0de7 D |
657 | struct pdev_entry *p, *n; |
658 | u16 phys_proc_id = TO_PHYS_ID(cpu); | |
e40cc4bd | 659 | |
bebe4678 | 660 | mutex_lock(&pdev_list_mutex); |
199e0de7 D |
661 | list_for_each_entry_safe(p, n, &pdev_list, list) { |
662 | if (p->phys_proc_id != phys_proc_id) | |
e40cc4bd | 663 | continue; |
e40cc4bd JB |
664 | platform_device_unregister(p->pdev); |
665 | list_del(&p->list); | |
e40cc4bd | 666 | kfree(p); |
bebe4678 RM |
667 | } |
668 | mutex_unlock(&pdev_list_mutex); | |
669 | } | |
670 | ||
d6db23c7 | 671 | static bool __cpuinit is_any_core_online(struct platform_data *pdata) |
199e0de7 D |
672 | { |
673 | int i; | |
674 | ||
675 | /* Find online cores, except pkgtemp data */ | |
676 | for (i = MAX_CORE_DATA - 1; i >= 0; --i) { | |
677 | if (pdata->core_data[i] && | |
678 | !pdata->core_data[i]->is_pkg_data) { | |
679 | return true; | |
680 | } | |
681 | } | |
682 | return false; | |
683 | } | |
684 | ||
685 | static void __cpuinit get_core_online(unsigned int cpu) | |
686 | { | |
687 | struct cpuinfo_x86 *c = &cpu_data(cpu); | |
688 | struct platform_device *pdev = coretemp_get_pdev(cpu); | |
689 | int err; | |
690 | ||
691 | /* | |
692 | * CPUID.06H.EAX[0] indicates whether the CPU has thermal | |
693 | * sensors. We check this bit only, all the early CPUs | |
694 | * without thermal sensors will be filtered out. | |
695 | */ | |
4ad33411 | 696 | if (!cpu_has(c, X86_FEATURE_DTHERM)) |
199e0de7 D |
697 | return; |
698 | ||
699 | if (!pdev) { | |
0eb9782a JD |
700 | /* Check the microcode version of the CPU */ |
701 | if (chk_ucode_version(cpu)) | |
702 | return; | |
703 | ||
199e0de7 D |
704 | /* |
705 | * Alright, we have DTS support. | |
706 | * We are bringing the _first_ core in this pkg | |
707 | * online. So, initialize per-pkg data structures and | |
708 | * then bring this core online. | |
709 | */ | |
710 | err = coretemp_device_add(cpu); | |
711 | if (err) | |
712 | return; | |
713 | /* | |
714 | * Check whether pkgtemp support is available. | |
715 | * If so, add interfaces for pkgtemp. | |
716 | */ | |
717 | if (cpu_has(c, X86_FEATURE_PTS)) | |
718 | coretemp_add_core(cpu, 1); | |
719 | } | |
720 | /* | |
721 | * Physical CPU device already exists. | |
722 | * So, just add interfaces for this core. | |
723 | */ | |
724 | coretemp_add_core(cpu, 0); | |
725 | } | |
726 | ||
727 | static void __cpuinit put_core_offline(unsigned int cpu) | |
728 | { | |
729 | int i, indx; | |
730 | struct platform_data *pdata; | |
731 | struct platform_device *pdev = coretemp_get_pdev(cpu); | |
732 | ||
733 | /* If the physical CPU device does not exist, just return */ | |
734 | if (!pdev) | |
735 | return; | |
736 | ||
737 | pdata = platform_get_drvdata(pdev); | |
738 | ||
739 | indx = TO_ATTR_NO(cpu); | |
740 | ||
b7048711 KS |
741 | /* The core id is too big, just return */ |
742 | if (indx > MAX_CORE_DATA - 1) | |
743 | return; | |
744 | ||
199e0de7 D |
745 | if (pdata->core_data[indx] && pdata->core_data[indx]->cpu == cpu) |
746 | coretemp_remove_core(pdata, &pdev->dev, indx); | |
747 | ||
f4e0bcf0 | 748 | /* |
6777b9e4 GR |
749 | * If a HT sibling of a core is taken offline, but another HT sibling |
750 | * of the same core is still online, register the alternate sibling. | |
751 | * This ensures that exactly one set of attributes is provided as long | |
752 | * as at least one HT sibling of a core is online. | |
f4e0bcf0 | 753 | */ |
bb74e8ca | 754 | for_each_sibling(i, cpu) { |
199e0de7 D |
755 | if (i != cpu) { |
756 | get_core_online(i); | |
f4e0bcf0 GR |
757 | /* |
758 | * Display temperature sensor data for one HT sibling | |
759 | * per core only, so abort the loop after one such | |
760 | * sibling has been found. | |
761 | */ | |
199e0de7 D |
762 | break; |
763 | } | |
764 | } | |
765 | /* | |
766 | * If all cores in this pkg are offline, remove the device. | |
767 | * coretemp_device_remove calls unregister_platform_device, | |
768 | * which in turn calls coretemp_remove. This removes the | |
769 | * pkgtemp entry and does other clean ups. | |
770 | */ | |
771 | if (!is_any_core_online(pdata)) | |
772 | coretemp_device_remove(cpu); | |
773 | } | |
774 | ||
ba7c1927 | 775 | static int __cpuinit coretemp_cpu_callback(struct notifier_block *nfb, |
bebe4678 RM |
776 | unsigned long action, void *hcpu) |
777 | { | |
778 | unsigned int cpu = (unsigned long) hcpu; | |
779 | ||
780 | switch (action) { | |
781 | case CPU_ONLINE: | |
561d9a96 | 782 | case CPU_DOWN_FAILED: |
199e0de7 | 783 | get_core_online(cpu); |
bebe4678 | 784 | break; |
561d9a96 | 785 | case CPU_DOWN_PREPARE: |
199e0de7 | 786 | put_core_offline(cpu); |
bebe4678 RM |
787 | break; |
788 | } | |
789 | return NOTIFY_OK; | |
790 | } | |
791 | ||
ba7c1927 | 792 | static struct notifier_block coretemp_cpu_notifier __refdata = { |
bebe4678 RM |
793 | .notifier_call = coretemp_cpu_callback, |
794 | }; | |
bebe4678 | 795 | |
e273bd98 | 796 | static const struct x86_cpu_id __initconst coretemp_ids[] = { |
4ad33411 | 797 | { X86_VENDOR_INTEL, X86_FAMILY_ANY, X86_MODEL_ANY, X86_FEATURE_DTHERM }, |
9b38096f AK |
798 | {} |
799 | }; | |
800 | MODULE_DEVICE_TABLE(x86cpu, coretemp_ids); | |
801 | ||
bebe4678 RM |
802 | static int __init coretemp_init(void) |
803 | { | |
1268a172 | 804 | int i, err; |
bebe4678 | 805 | |
9b38096f AK |
806 | /* |
807 | * CPUID.06H.EAX[0] indicates whether the CPU has thermal | |
808 | * sensors. We check this bit only, all the early CPUs | |
809 | * without thermal sensors will be filtered out. | |
810 | */ | |
811 | if (!x86_match_cpu(coretemp_ids)) | |
812 | return -ENODEV; | |
bebe4678 RM |
813 | |
814 | err = platform_driver_register(&coretemp_driver); | |
815 | if (err) | |
816 | goto exit; | |
817 | ||
641f1456 | 818 | get_online_cpus(); |
a4659053 | 819 | for_each_online_cpu(i) |
199e0de7 | 820 | get_core_online(i); |
89a3fd35 JB |
821 | |
822 | #ifndef CONFIG_HOTPLUG_CPU | |
bebe4678 | 823 | if (list_empty(&pdev_list)) { |
641f1456 | 824 | put_online_cpus(); |
bebe4678 RM |
825 | err = -ENODEV; |
826 | goto exit_driver_unreg; | |
827 | } | |
89a3fd35 | 828 | #endif |
bebe4678 | 829 | |
bebe4678 | 830 | register_hotcpu_notifier(&coretemp_cpu_notifier); |
641f1456 | 831 | put_online_cpus(); |
bebe4678 RM |
832 | return 0; |
833 | ||
0dca94ba | 834 | #ifndef CONFIG_HOTPLUG_CPU |
89a3fd35 | 835 | exit_driver_unreg: |
bebe4678 | 836 | platform_driver_unregister(&coretemp_driver); |
0dca94ba | 837 | #endif |
bebe4678 RM |
838 | exit: |
839 | return err; | |
840 | } | |
841 | ||
842 | static void __exit coretemp_exit(void) | |
843 | { | |
844 | struct pdev_entry *p, *n; | |
17c10d61 | 845 | |
641f1456 | 846 | get_online_cpus(); |
bebe4678 | 847 | unregister_hotcpu_notifier(&coretemp_cpu_notifier); |
bebe4678 RM |
848 | mutex_lock(&pdev_list_mutex); |
849 | list_for_each_entry_safe(p, n, &pdev_list, list) { | |
850 | platform_device_unregister(p->pdev); | |
851 | list_del(&p->list); | |
852 | kfree(p); | |
853 | } | |
854 | mutex_unlock(&pdev_list_mutex); | |
641f1456 | 855 | put_online_cpus(); |
bebe4678 RM |
856 | platform_driver_unregister(&coretemp_driver); |
857 | } | |
858 | ||
859 | MODULE_AUTHOR("Rudolf Marek <r.marek@assembler.cz>"); | |
860 | MODULE_DESCRIPTION("Intel Core temperature monitor"); | |
861 | MODULE_LICENSE("GPL"); | |
862 | ||
863 | module_init(coretemp_init) | |
864 | module_exit(coretemp_exit) |