Commit | Line | Data |
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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> | |
4cc45275 | 37 | #include <linux/smp.h> |
a45a8c85 | 38 | #include <linux/moduleparam.h> |
bebe4678 RM |
39 | #include <asm/msr.h> |
40 | #include <asm/processor.h> | |
9b38096f | 41 | #include <asm/cpu_device_id.h> |
bebe4678 RM |
42 | |
43 | #define DRVNAME "coretemp" | |
44 | ||
a45a8c85 JD |
45 | /* |
46 | * force_tjmax only matters when TjMax can't be read from the CPU itself. | |
47 | * When set, it replaces the driver's suboptimal heuristic. | |
48 | */ | |
49 | static int force_tjmax; | |
50 | module_param_named(tjmax, force_tjmax, int, 0444); | |
51 | MODULE_PARM_DESC(tjmax, "TjMax value in degrees Celsius"); | |
52 | ||
199e0de7 | 53 | #define BASE_SYSFS_ATTR_NO 2 /* Sysfs Base attr no for coretemp */ |
bdc71c9a | 54 | #define NUM_REAL_CORES 32 /* Number of Real cores per cpu */ |
199e0de7 | 55 | #define CORETEMP_NAME_LENGTH 17 /* String Length of attrs */ |
c814a4c7 | 56 | #define MAX_CORE_ATTRS 4 /* Maximum no of basic attrs */ |
f4af6fd6 | 57 | #define TOTAL_ATTRS (MAX_CORE_ATTRS + 1) |
199e0de7 D |
58 | #define MAX_CORE_DATA (NUM_REAL_CORES + BASE_SYSFS_ATTR_NO) |
59 | ||
780affe0 GR |
60 | #define TO_PHYS_ID(cpu) (cpu_data(cpu).phys_proc_id) |
61 | #define TO_CORE_ID(cpu) (cpu_data(cpu).cpu_core_id) | |
141168c3 KW |
62 | #define TO_ATTR_NO(cpu) (TO_CORE_ID(cpu) + BASE_SYSFS_ATTR_NO) |
63 | ||
64 | #ifdef CONFIG_SMP | |
bb74e8ca | 65 | #define for_each_sibling(i, cpu) for_each_cpu(i, cpu_sibling_mask(cpu)) |
199e0de7 | 66 | #else |
bb74e8ca | 67 | #define for_each_sibling(i, cpu) for (i = 0; false; ) |
199e0de7 | 68 | #endif |
bebe4678 RM |
69 | |
70 | /* | |
199e0de7 D |
71 | * Per-Core Temperature Data |
72 | * @last_updated: The time when the current temperature value was updated | |
73 | * earlier (in jiffies). | |
74 | * @cpu_core_id: The CPU Core from which temperature values should be read | |
75 | * This value is passed as "id" field to rdmsr/wrmsr functions. | |
76 | * @status_reg: One of IA32_THERM_STATUS or IA32_PACKAGE_THERM_STATUS, | |
77 | * from where the temperature values should be read. | |
c814a4c7 | 78 | * @attr_size: Total number of pre-core attrs displayed in the sysfs. |
199e0de7 D |
79 | * @is_pkg_data: If this is 1, the temp_data holds pkgtemp data. |
80 | * Otherwise, temp_data holds coretemp data. | |
81 | * @valid: If this is 1, the current temperature is valid. | |
bebe4678 | 82 | */ |
199e0de7 | 83 | struct temp_data { |
bebe4678 | 84 | int temp; |
6369a288 | 85 | int ttarget; |
199e0de7 D |
86 | int tjmax; |
87 | unsigned long last_updated; | |
88 | unsigned int cpu; | |
89 | u32 cpu_core_id; | |
90 | u32 status_reg; | |
c814a4c7 | 91 | int attr_size; |
199e0de7 D |
92 | bool is_pkg_data; |
93 | bool valid; | |
c814a4c7 D |
94 | struct sensor_device_attribute sd_attrs[TOTAL_ATTRS]; |
95 | char attr_name[TOTAL_ATTRS][CORETEMP_NAME_LENGTH]; | |
199e0de7 | 96 | struct mutex update_lock; |
bebe4678 RM |
97 | }; |
98 | ||
199e0de7 D |
99 | /* Platform Data per Physical CPU */ |
100 | struct platform_data { | |
101 | struct device *hwmon_dev; | |
102 | u16 phys_proc_id; | |
103 | struct temp_data *core_data[MAX_CORE_DATA]; | |
104 | struct device_attribute name_attr; | |
105 | }; | |
bebe4678 | 106 | |
199e0de7 D |
107 | struct pdev_entry { |
108 | struct list_head list; | |
109 | struct platform_device *pdev; | |
199e0de7 | 110 | u16 phys_proc_id; |
199e0de7 D |
111 | }; |
112 | ||
113 | static LIST_HEAD(pdev_list); | |
114 | static DEFINE_MUTEX(pdev_list_mutex); | |
115 | ||
116 | static ssize_t show_name(struct device *dev, | |
117 | struct device_attribute *devattr, char *buf) | |
118 | { | |
119 | return sprintf(buf, "%s\n", DRVNAME); | |
120 | } | |
121 | ||
122 | static ssize_t show_label(struct device *dev, | |
123 | struct device_attribute *devattr, char *buf) | |
bebe4678 | 124 | { |
bebe4678 | 125 | struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); |
199e0de7 D |
126 | struct platform_data *pdata = dev_get_drvdata(dev); |
127 | struct temp_data *tdata = pdata->core_data[attr->index]; | |
128 | ||
129 | if (tdata->is_pkg_data) | |
130 | return sprintf(buf, "Physical id %u\n", pdata->phys_proc_id); | |
bebe4678 | 131 | |
199e0de7 | 132 | return sprintf(buf, "Core %u\n", tdata->cpu_core_id); |
bebe4678 RM |
133 | } |
134 | ||
199e0de7 D |
135 | static ssize_t show_crit_alarm(struct device *dev, |
136 | struct device_attribute *devattr, char *buf) | |
bebe4678 | 137 | { |
199e0de7 D |
138 | u32 eax, edx; |
139 | struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); | |
140 | struct platform_data *pdata = dev_get_drvdata(dev); | |
141 | struct temp_data *tdata = pdata->core_data[attr->index]; | |
142 | ||
143 | rdmsr_on_cpu(tdata->cpu, tdata->status_reg, &eax, &edx); | |
144 | ||
145 | return sprintf(buf, "%d\n", (eax >> 5) & 1); | |
bebe4678 RM |
146 | } |
147 | ||
199e0de7 D |
148 | static ssize_t show_tjmax(struct device *dev, |
149 | struct device_attribute *devattr, char *buf) | |
bebe4678 RM |
150 | { |
151 | struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); | |
199e0de7 | 152 | struct platform_data *pdata = dev_get_drvdata(dev); |
bebe4678 | 153 | |
199e0de7 | 154 | return sprintf(buf, "%d\n", pdata->core_data[attr->index]->tjmax); |
bebe4678 RM |
155 | } |
156 | ||
199e0de7 D |
157 | static ssize_t show_ttarget(struct device *dev, |
158 | struct device_attribute *devattr, char *buf) | |
159 | { | |
160 | struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); | |
161 | struct platform_data *pdata = dev_get_drvdata(dev); | |
bebe4678 | 162 | |
199e0de7 D |
163 | return sprintf(buf, "%d\n", pdata->core_data[attr->index]->ttarget); |
164 | } | |
bebe4678 | 165 | |
199e0de7 D |
166 | static ssize_t show_temp(struct device *dev, |
167 | struct device_attribute *devattr, char *buf) | |
bebe4678 | 168 | { |
199e0de7 D |
169 | u32 eax, edx; |
170 | struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); | |
171 | struct platform_data *pdata = dev_get_drvdata(dev); | |
172 | struct temp_data *tdata = pdata->core_data[attr->index]; | |
bebe4678 | 173 | |
199e0de7 | 174 | mutex_lock(&tdata->update_lock); |
bebe4678 | 175 | |
199e0de7 D |
176 | /* Check whether the time interval has elapsed */ |
177 | if (!tdata->valid || time_after(jiffies, tdata->last_updated + HZ)) { | |
178 | rdmsr_on_cpu(tdata->cpu, tdata->status_reg, &eax, &edx); | |
179 | tdata->valid = 0; | |
180 | /* Check whether the data is valid */ | |
bebe4678 | 181 | if (eax & 0x80000000) { |
199e0de7 | 182 | tdata->temp = tdata->tjmax - |
4cc45275 | 183 | ((eax >> 16) & 0x7f) * 1000; |
199e0de7 | 184 | tdata->valid = 1; |
bebe4678 | 185 | } |
199e0de7 | 186 | tdata->last_updated = jiffies; |
bebe4678 RM |
187 | } |
188 | ||
199e0de7 D |
189 | mutex_unlock(&tdata->update_lock); |
190 | return tdata->valid ? sprintf(buf, "%d\n", tdata->temp) : -EAGAIN; | |
bebe4678 RM |
191 | } |
192 | ||
41e58a1f GR |
193 | struct tjmax { |
194 | char const *id; | |
195 | int tjmax; | |
196 | }; | |
197 | ||
64f50307 | 198 | static const struct tjmax __cpuinitconst tjmax_table[] = { |
1102dcab GR |
199 | { "CPU 230", 100000 }, /* Model 0x1c, stepping 2 */ |
200 | { "CPU 330", 125000 }, /* Model 0x1c, stepping 2 */ | |
201 | { "CPU CE4110", 110000 }, /* Model 0x1c, stepping 10 */ | |
202 | { "CPU CE4150", 110000 }, /* Model 0x1c, stepping 10 */ | |
203 | { "CPU CE4170", 110000 }, /* Model 0x1c, stepping 10 */ | |
41e58a1f GR |
204 | }; |
205 | ||
2fa5222e GR |
206 | struct tjmax_model { |
207 | u8 model; | |
208 | u8 mask; | |
209 | int tjmax; | |
210 | }; | |
211 | ||
212 | #define ANY 0xff | |
213 | ||
214 | static const struct tjmax_model __cpuinitconst tjmax_model_table[] = { | |
215 | { 0x1c, 10, 100000 }, /* D4xx, N4xx, D5xx, N5xx */ | |
216 | { 0x1c, ANY, 90000 }, /* Z5xx, N2xx, possibly others | |
217 | * Note: Also matches 230 and 330, | |
218 | * which are covered by tjmax_table | |
219 | */ | |
220 | { 0x26, ANY, 90000 }, /* Atom Tunnel Creek (Exx), Lincroft (Z6xx) | |
221 | * Note: TjMax for E6xxT is 110C, but CPU type | |
222 | * is undetectable by software | |
223 | */ | |
224 | { 0x27, ANY, 90000 }, /* Atom Medfield (Z2460) */ | |
225 | { 0x36, ANY, 100000 }, /* Atom Cedar Trail/Cedarview (N2xxx, D2xxx) */ | |
226 | }; | |
227 | ||
d6db23c7 JD |
228 | static int __cpuinit adjust_tjmax(struct cpuinfo_x86 *c, u32 id, |
229 | struct device *dev) | |
118a8871 RM |
230 | { |
231 | /* The 100C is default for both mobile and non mobile CPUs */ | |
232 | ||
233 | int tjmax = 100000; | |
eccfed42 | 234 | int tjmax_ee = 85000; |
708a62bc | 235 | int usemsr_ee = 1; |
118a8871 RM |
236 | int err; |
237 | u32 eax, edx; | |
41e58a1f GR |
238 | int i; |
239 | ||
240 | /* explicit tjmax table entries override heuristics */ | |
241 | for (i = 0; i < ARRAY_SIZE(tjmax_table); i++) { | |
242 | if (strstr(c->x86_model_id, tjmax_table[i].id)) | |
243 | return tjmax_table[i].tjmax; | |
244 | } | |
118a8871 | 245 | |
2fa5222e GR |
246 | for (i = 0; i < ARRAY_SIZE(tjmax_model_table); i++) { |
247 | const struct tjmax_model *tm = &tjmax_model_table[i]; | |
248 | if (c->x86_model == tm->model && | |
249 | (tm->mask == ANY || c->x86_mask == tm->mask)) | |
250 | return tm->tjmax; | |
72cbdddc | 251 | } |
1fe63ab4 | 252 | |
72cbdddc | 253 | /* Early chips have no MSR for TjMax */ |
1fe63ab4 | 254 | |
72cbdddc | 255 | if (c->x86_model == 0xf && c->x86_mask < 4) |
5592906f | 256 | usemsr_ee = 0; |
708a62bc | 257 | |
4cc45275 | 258 | if (c->x86_model > 0xe && usemsr_ee) { |
eccfed42 | 259 | u8 platform_id; |
118a8871 | 260 | |
4cc45275 GR |
261 | /* |
262 | * Now we can detect the mobile CPU using Intel provided table | |
263 | * http://softwarecommunity.intel.com/Wiki/Mobility/720.htm | |
264 | * For Core2 cores, check MSR 0x17, bit 28 1 = Mobile CPU | |
265 | */ | |
118a8871 RM |
266 | err = rdmsr_safe_on_cpu(id, 0x17, &eax, &edx); |
267 | if (err) { | |
268 | dev_warn(dev, | |
269 | "Unable to access MSR 0x17, assuming desktop" | |
270 | " CPU\n"); | |
708a62bc | 271 | usemsr_ee = 0; |
eccfed42 | 272 | } else if (c->x86_model < 0x17 && !(eax & 0x10000000)) { |
4cc45275 GR |
273 | /* |
274 | * Trust bit 28 up to Penryn, I could not find any | |
275 | * documentation on that; if you happen to know | |
276 | * someone at Intel please ask | |
277 | */ | |
708a62bc | 278 | usemsr_ee = 0; |
eccfed42 RM |
279 | } else { |
280 | /* Platform ID bits 52:50 (EDX starts at bit 32) */ | |
281 | platform_id = (edx >> 18) & 0x7; | |
282 | ||
4cc45275 GR |
283 | /* |
284 | * Mobile Penryn CPU seems to be platform ID 7 or 5 | |
285 | * (guesswork) | |
286 | */ | |
287 | if (c->x86_model == 0x17 && | |
288 | (platform_id == 5 || platform_id == 7)) { | |
289 | /* | |
290 | * If MSR EE bit is set, set it to 90 degrees C, | |
291 | * otherwise 105 degrees C | |
292 | */ | |
eccfed42 RM |
293 | tjmax_ee = 90000; |
294 | tjmax = 105000; | |
295 | } | |
118a8871 RM |
296 | } |
297 | } | |
298 | ||
708a62bc | 299 | if (usemsr_ee) { |
118a8871 RM |
300 | err = rdmsr_safe_on_cpu(id, 0xee, &eax, &edx); |
301 | if (err) { | |
302 | dev_warn(dev, | |
303 | "Unable to access MSR 0xEE, for Tjmax, left" | |
4d7a5644 | 304 | " at default\n"); |
118a8871 | 305 | } else if (eax & 0x40000000) { |
eccfed42 | 306 | tjmax = tjmax_ee; |
118a8871 | 307 | } |
708a62bc | 308 | } else if (tjmax == 100000) { |
4cc45275 GR |
309 | /* |
310 | * If we don't use msr EE it means we are desktop CPU | |
311 | * (with exeception of Atom) | |
312 | */ | |
118a8871 RM |
313 | dev_warn(dev, "Using relative temperature scale!\n"); |
314 | } | |
315 | ||
316 | return tjmax; | |
317 | } | |
318 | ||
d6db23c7 JD |
319 | static int __cpuinit get_tjmax(struct cpuinfo_x86 *c, u32 id, |
320 | struct device *dev) | |
a321cedb | 321 | { |
a321cedb CE |
322 | int err; |
323 | u32 eax, edx; | |
324 | u32 val; | |
325 | ||
4cc45275 GR |
326 | /* |
327 | * A new feature of current Intel(R) processors, the | |
328 | * IA32_TEMPERATURE_TARGET contains the TjMax value | |
329 | */ | |
a321cedb CE |
330 | err = rdmsr_safe_on_cpu(id, MSR_IA32_TEMPERATURE_TARGET, &eax, &edx); |
331 | if (err) { | |
6bf9e9b0 JD |
332 | if (c->x86_model > 0xe && c->x86_model != 0x1c) |
333 | dev_warn(dev, "Unable to read TjMax from CPU %u\n", id); | |
a321cedb CE |
334 | } else { |
335 | val = (eax >> 16) & 0xff; | |
336 | /* | |
337 | * If the TjMax is not plausible, an assumption | |
338 | * will be used | |
339 | */ | |
bb9973e4 | 340 | if (val) { |
6bf9e9b0 | 341 | dev_dbg(dev, "TjMax is %d degrees C\n", val); |
a321cedb CE |
342 | return val * 1000; |
343 | } | |
344 | } | |
345 | ||
a45a8c85 JD |
346 | if (force_tjmax) { |
347 | dev_notice(dev, "TjMax forced to %d degrees C by user\n", | |
348 | force_tjmax); | |
349 | return force_tjmax * 1000; | |
350 | } | |
351 | ||
a321cedb CE |
352 | /* |
353 | * An assumption is made for early CPUs and unreadable MSR. | |
4f5f71a7 | 354 | * NOTE: the calculated value may not be correct. |
a321cedb | 355 | */ |
4f5f71a7 | 356 | return adjust_tjmax(c, id, dev); |
a321cedb CE |
357 | } |
358 | ||
6c931ae1 | 359 | static int create_name_attr(struct platform_data *pdata, |
d6db23c7 | 360 | struct device *dev) |
199e0de7 | 361 | { |
4258781a | 362 | sysfs_attr_init(&pdata->name_attr.attr); |
199e0de7 D |
363 | pdata->name_attr.attr.name = "name"; |
364 | pdata->name_attr.attr.mode = S_IRUGO; | |
365 | pdata->name_attr.show = show_name; | |
366 | return device_create_file(dev, &pdata->name_attr); | |
367 | } | |
bebe4678 | 368 | |
d6db23c7 JD |
369 | static int __cpuinit create_core_attrs(struct temp_data *tdata, |
370 | struct device *dev, int attr_no) | |
199e0de7 D |
371 | { |
372 | int err, i; | |
e3204ed3 | 373 | static ssize_t (*const rd_ptr[TOTAL_ATTRS]) (struct device *dev, |
199e0de7 | 374 | struct device_attribute *devattr, char *buf) = { |
c814a4c7 | 375 | show_label, show_crit_alarm, show_temp, show_tjmax, |
f4af6fd6 | 376 | show_ttarget }; |
e3204ed3 | 377 | static const char *const names[TOTAL_ATTRS] = { |
199e0de7 | 378 | "temp%d_label", "temp%d_crit_alarm", |
c814a4c7 | 379 | "temp%d_input", "temp%d_crit", |
f4af6fd6 | 380 | "temp%d_max" }; |
199e0de7 | 381 | |
c814a4c7 | 382 | for (i = 0; i < tdata->attr_size; i++) { |
199e0de7 D |
383 | snprintf(tdata->attr_name[i], CORETEMP_NAME_LENGTH, names[i], |
384 | attr_no); | |
4258781a | 385 | sysfs_attr_init(&tdata->sd_attrs[i].dev_attr.attr); |
199e0de7 D |
386 | tdata->sd_attrs[i].dev_attr.attr.name = tdata->attr_name[i]; |
387 | tdata->sd_attrs[i].dev_attr.attr.mode = S_IRUGO; | |
388 | tdata->sd_attrs[i].dev_attr.show = rd_ptr[i]; | |
199e0de7 D |
389 | tdata->sd_attrs[i].index = attr_no; |
390 | err = device_create_file(dev, &tdata->sd_attrs[i].dev_attr); | |
391 | if (err) | |
392 | goto exit_free; | |
bebe4678 | 393 | } |
199e0de7 D |
394 | return 0; |
395 | ||
396 | exit_free: | |
397 | while (--i >= 0) | |
398 | device_remove_file(dev, &tdata->sd_attrs[i].dev_attr); | |
399 | return err; | |
400 | } | |
401 | ||
199e0de7 | 402 | |
0eb9782a | 403 | static int __cpuinit chk_ucode_version(unsigned int cpu) |
199e0de7 | 404 | { |
0eb9782a | 405 | struct cpuinfo_x86 *c = &cpu_data(cpu); |
67f363b1 | 406 | |
199e0de7 D |
407 | /* |
408 | * Check if we have problem with errata AE18 of Core processors: | |
409 | * Readings might stop update when processor visited too deep sleep, | |
410 | * fixed for stepping D0 (6EC). | |
411 | */ | |
ca8bc8dc AK |
412 | if (c->x86_model == 0xe && c->x86_mask < 0xc && c->microcode < 0x39) { |
413 | pr_err("Errata AE18 not fixed, update BIOS or " | |
414 | "microcode of the CPU!\n"); | |
415 | return -ENODEV; | |
67f363b1 | 416 | } |
199e0de7 D |
417 | return 0; |
418 | } | |
419 | ||
d6db23c7 | 420 | static struct platform_device __cpuinit *coretemp_get_pdev(unsigned int cpu) |
199e0de7 D |
421 | { |
422 | u16 phys_proc_id = TO_PHYS_ID(cpu); | |
423 | struct pdev_entry *p; | |
424 | ||
425 | mutex_lock(&pdev_list_mutex); | |
426 | ||
427 | list_for_each_entry(p, &pdev_list, list) | |
428 | if (p->phys_proc_id == phys_proc_id) { | |
429 | mutex_unlock(&pdev_list_mutex); | |
430 | return p->pdev; | |
431 | } | |
432 | ||
433 | mutex_unlock(&pdev_list_mutex); | |
434 | return NULL; | |
435 | } | |
436 | ||
d6db23c7 JD |
437 | static struct temp_data __cpuinit *init_temp_data(unsigned int cpu, |
438 | int pkg_flag) | |
199e0de7 D |
439 | { |
440 | struct temp_data *tdata; | |
441 | ||
442 | tdata = kzalloc(sizeof(struct temp_data), GFP_KERNEL); | |
443 | if (!tdata) | |
444 | return NULL; | |
445 | ||
446 | tdata->status_reg = pkg_flag ? MSR_IA32_PACKAGE_THERM_STATUS : | |
447 | MSR_IA32_THERM_STATUS; | |
448 | tdata->is_pkg_data = pkg_flag; | |
449 | tdata->cpu = cpu; | |
450 | tdata->cpu_core_id = TO_CORE_ID(cpu); | |
c814a4c7 | 451 | tdata->attr_size = MAX_CORE_ATTRS; |
199e0de7 D |
452 | mutex_init(&tdata->update_lock); |
453 | return tdata; | |
454 | } | |
67f363b1 | 455 | |
d6db23c7 | 456 | static int __cpuinit create_core_data(struct platform_device *pdev, |
199e0de7 D |
457 | unsigned int cpu, int pkg_flag) |
458 | { | |
459 | struct temp_data *tdata; | |
2f1c3db0 | 460 | struct platform_data *pdata = platform_get_drvdata(pdev); |
199e0de7 D |
461 | struct cpuinfo_x86 *c = &cpu_data(cpu); |
462 | u32 eax, edx; | |
463 | int err, attr_no; | |
bebe4678 | 464 | |
a321cedb | 465 | /* |
199e0de7 D |
466 | * Find attr number for sysfs: |
467 | * We map the attr number to core id of the CPU | |
468 | * The attr number is always core id + 2 | |
469 | * The Pkgtemp will always show up as temp1_*, if available | |
a321cedb | 470 | */ |
199e0de7 | 471 | attr_no = pkg_flag ? 1 : TO_ATTR_NO(cpu); |
6369a288 | 472 | |
199e0de7 D |
473 | if (attr_no > MAX_CORE_DATA - 1) |
474 | return -ERANGE; | |
475 | ||
f4e0bcf0 GR |
476 | /* |
477 | * Provide a single set of attributes for all HT siblings of a core | |
478 | * to avoid duplicate sensors (the processor ID and core ID of all | |
6777b9e4 GR |
479 | * HT siblings of a core are the same). |
480 | * Skip if a HT sibling of this core is already registered. | |
f4e0bcf0 GR |
481 | * This is not an error. |
482 | */ | |
199e0de7 D |
483 | if (pdata->core_data[attr_no] != NULL) |
484 | return 0; | |
6369a288 | 485 | |
199e0de7 D |
486 | tdata = init_temp_data(cpu, pkg_flag); |
487 | if (!tdata) | |
488 | return -ENOMEM; | |
bebe4678 | 489 | |
199e0de7 D |
490 | /* Test if we can access the status register */ |
491 | err = rdmsr_safe_on_cpu(cpu, tdata->status_reg, &eax, &edx); | |
492 | if (err) | |
493 | goto exit_free; | |
494 | ||
495 | /* We can access status register. Get Critical Temperature */ | |
6bf9e9b0 | 496 | tdata->tjmax = get_tjmax(c, cpu, &pdev->dev); |
199e0de7 | 497 | |
c814a4c7 | 498 | /* |
f4af6fd6 GR |
499 | * Read the still undocumented bits 8:15 of IA32_TEMPERATURE_TARGET. |
500 | * The target temperature is available on older CPUs but not in this | |
501 | * register. Atoms don't have the register at all. | |
c814a4c7 | 502 | */ |
f4af6fd6 GR |
503 | if (c->x86_model > 0xe && c->x86_model != 0x1c) { |
504 | err = rdmsr_safe_on_cpu(cpu, MSR_IA32_TEMPERATURE_TARGET, | |
505 | &eax, &edx); | |
506 | if (!err) { | |
507 | tdata->ttarget | |
508 | = tdata->tjmax - ((eax >> 8) & 0xff) * 1000; | |
509 | tdata->attr_size++; | |
510 | } | |
c814a4c7 D |
511 | } |
512 | ||
199e0de7 D |
513 | pdata->core_data[attr_no] = tdata; |
514 | ||
515 | /* Create sysfs interfaces */ | |
516 | err = create_core_attrs(tdata, &pdev->dev, attr_no); | |
517 | if (err) | |
518 | goto exit_free; | |
bebe4678 RM |
519 | |
520 | return 0; | |
199e0de7 | 521 | exit_free: |
20ecb499 | 522 | pdata->core_data[attr_no] = NULL; |
199e0de7 D |
523 | kfree(tdata); |
524 | return err; | |
525 | } | |
526 | ||
d6db23c7 | 527 | static void __cpuinit coretemp_add_core(unsigned int cpu, int pkg_flag) |
199e0de7 | 528 | { |
199e0de7 D |
529 | struct platform_device *pdev = coretemp_get_pdev(cpu); |
530 | int err; | |
531 | ||
532 | if (!pdev) | |
533 | return; | |
534 | ||
2f1c3db0 | 535 | err = create_core_data(pdev, cpu, pkg_flag); |
199e0de7 D |
536 | if (err) |
537 | dev_err(&pdev->dev, "Adding Core %u failed\n", cpu); | |
538 | } | |
539 | ||
540 | static void coretemp_remove_core(struct platform_data *pdata, | |
541 | struct device *dev, int indx) | |
542 | { | |
543 | int i; | |
544 | struct temp_data *tdata = pdata->core_data[indx]; | |
545 | ||
546 | /* Remove the sysfs attributes */ | |
c814a4c7 | 547 | for (i = 0; i < tdata->attr_size; i++) |
199e0de7 D |
548 | device_remove_file(dev, &tdata->sd_attrs[i].dev_attr); |
549 | ||
550 | kfree(pdata->core_data[indx]); | |
551 | pdata->core_data[indx] = NULL; | |
552 | } | |
553 | ||
6c931ae1 | 554 | static int coretemp_probe(struct platform_device *pdev) |
199e0de7 D |
555 | { |
556 | struct platform_data *pdata; | |
557 | int err; | |
bebe4678 | 558 | |
199e0de7 D |
559 | /* Initialize the per-package data structures */ |
560 | pdata = kzalloc(sizeof(struct platform_data), GFP_KERNEL); | |
561 | if (!pdata) | |
562 | return -ENOMEM; | |
563 | ||
564 | err = create_name_attr(pdata, &pdev->dev); | |
565 | if (err) | |
566 | goto exit_free; | |
567 | ||
b3a242a6 | 568 | pdata->phys_proc_id = pdev->id; |
199e0de7 D |
569 | platform_set_drvdata(pdev, pdata); |
570 | ||
571 | pdata->hwmon_dev = hwmon_device_register(&pdev->dev); | |
572 | if (IS_ERR(pdata->hwmon_dev)) { | |
573 | err = PTR_ERR(pdata->hwmon_dev); | |
574 | dev_err(&pdev->dev, "Class registration failed (%d)\n", err); | |
575 | goto exit_name; | |
576 | } | |
577 | return 0; | |
578 | ||
579 | exit_name: | |
580 | device_remove_file(&pdev->dev, &pdata->name_attr); | |
581 | platform_set_drvdata(pdev, NULL); | |
bebe4678 | 582 | exit_free: |
199e0de7 | 583 | kfree(pdata); |
bebe4678 RM |
584 | return err; |
585 | } | |
586 | ||
281dfd0b | 587 | static int coretemp_remove(struct platform_device *pdev) |
bebe4678 | 588 | { |
199e0de7 D |
589 | struct platform_data *pdata = platform_get_drvdata(pdev); |
590 | int i; | |
bebe4678 | 591 | |
199e0de7 D |
592 | for (i = MAX_CORE_DATA - 1; i >= 0; --i) |
593 | if (pdata->core_data[i]) | |
594 | coretemp_remove_core(pdata, &pdev->dev, i); | |
595 | ||
596 | device_remove_file(&pdev->dev, &pdata->name_attr); | |
597 | hwmon_device_unregister(pdata->hwmon_dev); | |
bebe4678 | 598 | platform_set_drvdata(pdev, NULL); |
199e0de7 | 599 | kfree(pdata); |
bebe4678 RM |
600 | return 0; |
601 | } | |
602 | ||
603 | static struct platform_driver coretemp_driver = { | |
604 | .driver = { | |
605 | .owner = THIS_MODULE, | |
606 | .name = DRVNAME, | |
607 | }, | |
608 | .probe = coretemp_probe, | |
9e5e9b7a | 609 | .remove = coretemp_remove, |
bebe4678 RM |
610 | }; |
611 | ||
bebe4678 RM |
612 | static int __cpuinit coretemp_device_add(unsigned int cpu) |
613 | { | |
614 | int err; | |
615 | struct platform_device *pdev; | |
616 | struct pdev_entry *pdev_entry; | |
d883b9f0 JD |
617 | |
618 | mutex_lock(&pdev_list_mutex); | |
619 | ||
b3a242a6 | 620 | pdev = platform_device_alloc(DRVNAME, TO_PHYS_ID(cpu)); |
bebe4678 RM |
621 | if (!pdev) { |
622 | err = -ENOMEM; | |
f8bb8925 | 623 | pr_err("Device allocation failed\n"); |
bebe4678 RM |
624 | goto exit; |
625 | } | |
626 | ||
627 | pdev_entry = kzalloc(sizeof(struct pdev_entry), GFP_KERNEL); | |
628 | if (!pdev_entry) { | |
629 | err = -ENOMEM; | |
630 | goto exit_device_put; | |
631 | } | |
632 | ||
633 | err = platform_device_add(pdev); | |
634 | if (err) { | |
f8bb8925 | 635 | pr_err("Device addition failed (%d)\n", err); |
bebe4678 RM |
636 | goto exit_device_free; |
637 | } | |
638 | ||
639 | pdev_entry->pdev = pdev; | |
0eb9782a | 640 | pdev_entry->phys_proc_id = pdev->id; |
199e0de7 | 641 | |
bebe4678 RM |
642 | list_add_tail(&pdev_entry->list, &pdev_list); |
643 | mutex_unlock(&pdev_list_mutex); | |
644 | ||
645 | return 0; | |
646 | ||
647 | exit_device_free: | |
648 | kfree(pdev_entry); | |
649 | exit_device_put: | |
650 | platform_device_put(pdev); | |
651 | exit: | |
d883b9f0 | 652 | mutex_unlock(&pdev_list_mutex); |
bebe4678 RM |
653 | return err; |
654 | } | |
655 | ||
d6db23c7 | 656 | static void __cpuinit coretemp_device_remove(unsigned int cpu) |
bebe4678 | 657 | { |
199e0de7 D |
658 | struct pdev_entry *p, *n; |
659 | u16 phys_proc_id = TO_PHYS_ID(cpu); | |
e40cc4bd | 660 | |
bebe4678 | 661 | mutex_lock(&pdev_list_mutex); |
199e0de7 D |
662 | list_for_each_entry_safe(p, n, &pdev_list, list) { |
663 | if (p->phys_proc_id != phys_proc_id) | |
e40cc4bd | 664 | continue; |
e40cc4bd JB |
665 | platform_device_unregister(p->pdev); |
666 | list_del(&p->list); | |
e40cc4bd | 667 | kfree(p); |
bebe4678 RM |
668 | } |
669 | mutex_unlock(&pdev_list_mutex); | |
670 | } | |
671 | ||
d6db23c7 | 672 | static bool __cpuinit is_any_core_online(struct platform_data *pdata) |
199e0de7 D |
673 | { |
674 | int i; | |
675 | ||
676 | /* Find online cores, except pkgtemp data */ | |
677 | for (i = MAX_CORE_DATA - 1; i >= 0; --i) { | |
678 | if (pdata->core_data[i] && | |
679 | !pdata->core_data[i]->is_pkg_data) { | |
680 | return true; | |
681 | } | |
682 | } | |
683 | return false; | |
684 | } | |
685 | ||
686 | static void __cpuinit get_core_online(unsigned int cpu) | |
687 | { | |
688 | struct cpuinfo_x86 *c = &cpu_data(cpu); | |
689 | struct platform_device *pdev = coretemp_get_pdev(cpu); | |
690 | int err; | |
691 | ||
692 | /* | |
693 | * CPUID.06H.EAX[0] indicates whether the CPU has thermal | |
694 | * sensors. We check this bit only, all the early CPUs | |
695 | * without thermal sensors will be filtered out. | |
696 | */ | |
4ad33411 | 697 | if (!cpu_has(c, X86_FEATURE_DTHERM)) |
199e0de7 D |
698 | return; |
699 | ||
700 | if (!pdev) { | |
0eb9782a JD |
701 | /* Check the microcode version of the CPU */ |
702 | if (chk_ucode_version(cpu)) | |
703 | return; | |
704 | ||
199e0de7 D |
705 | /* |
706 | * Alright, we have DTS support. | |
707 | * We are bringing the _first_ core in this pkg | |
708 | * online. So, initialize per-pkg data structures and | |
709 | * then bring this core online. | |
710 | */ | |
711 | err = coretemp_device_add(cpu); | |
712 | if (err) | |
713 | return; | |
714 | /* | |
715 | * Check whether pkgtemp support is available. | |
716 | * If so, add interfaces for pkgtemp. | |
717 | */ | |
718 | if (cpu_has(c, X86_FEATURE_PTS)) | |
719 | coretemp_add_core(cpu, 1); | |
720 | } | |
721 | /* | |
722 | * Physical CPU device already exists. | |
723 | * So, just add interfaces for this core. | |
724 | */ | |
725 | coretemp_add_core(cpu, 0); | |
726 | } | |
727 | ||
728 | static void __cpuinit put_core_offline(unsigned int cpu) | |
729 | { | |
730 | int i, indx; | |
731 | struct platform_data *pdata; | |
732 | struct platform_device *pdev = coretemp_get_pdev(cpu); | |
733 | ||
734 | /* If the physical CPU device does not exist, just return */ | |
735 | if (!pdev) | |
736 | return; | |
737 | ||
738 | pdata = platform_get_drvdata(pdev); | |
739 | ||
740 | indx = TO_ATTR_NO(cpu); | |
741 | ||
b7048711 KS |
742 | /* The core id is too big, just return */ |
743 | if (indx > MAX_CORE_DATA - 1) | |
744 | return; | |
745 | ||
199e0de7 D |
746 | if (pdata->core_data[indx] && pdata->core_data[indx]->cpu == cpu) |
747 | coretemp_remove_core(pdata, &pdev->dev, indx); | |
748 | ||
f4e0bcf0 | 749 | /* |
6777b9e4 GR |
750 | * If a HT sibling of a core is taken offline, but another HT sibling |
751 | * of the same core is still online, register the alternate sibling. | |
752 | * This ensures that exactly one set of attributes is provided as long | |
753 | * as at least one HT sibling of a core is online. | |
f4e0bcf0 | 754 | */ |
bb74e8ca | 755 | for_each_sibling(i, cpu) { |
199e0de7 D |
756 | if (i != cpu) { |
757 | get_core_online(i); | |
f4e0bcf0 GR |
758 | /* |
759 | * Display temperature sensor data for one HT sibling | |
760 | * per core only, so abort the loop after one such | |
761 | * sibling has been found. | |
762 | */ | |
199e0de7 D |
763 | break; |
764 | } | |
765 | } | |
766 | /* | |
767 | * If all cores in this pkg are offline, remove the device. | |
768 | * coretemp_device_remove calls unregister_platform_device, | |
769 | * which in turn calls coretemp_remove. This removes the | |
770 | * pkgtemp entry and does other clean ups. | |
771 | */ | |
772 | if (!is_any_core_online(pdata)) | |
773 | coretemp_device_remove(cpu); | |
774 | } | |
775 | ||
ba7c1927 | 776 | static int __cpuinit coretemp_cpu_callback(struct notifier_block *nfb, |
bebe4678 RM |
777 | unsigned long action, void *hcpu) |
778 | { | |
779 | unsigned int cpu = (unsigned long) hcpu; | |
780 | ||
781 | switch (action) { | |
782 | case CPU_ONLINE: | |
561d9a96 | 783 | case CPU_DOWN_FAILED: |
199e0de7 | 784 | get_core_online(cpu); |
bebe4678 | 785 | break; |
561d9a96 | 786 | case CPU_DOWN_PREPARE: |
199e0de7 | 787 | put_core_offline(cpu); |
bebe4678 RM |
788 | break; |
789 | } | |
790 | return NOTIFY_OK; | |
791 | } | |
792 | ||
ba7c1927 | 793 | static struct notifier_block coretemp_cpu_notifier __refdata = { |
bebe4678 RM |
794 | .notifier_call = coretemp_cpu_callback, |
795 | }; | |
bebe4678 | 796 | |
e273bd98 | 797 | static const struct x86_cpu_id __initconst coretemp_ids[] = { |
4ad33411 | 798 | { X86_VENDOR_INTEL, X86_FAMILY_ANY, X86_MODEL_ANY, X86_FEATURE_DTHERM }, |
9b38096f AK |
799 | {} |
800 | }; | |
801 | MODULE_DEVICE_TABLE(x86cpu, coretemp_ids); | |
802 | ||
bebe4678 RM |
803 | static int __init coretemp_init(void) |
804 | { | |
1268a172 | 805 | int i, err; |
bebe4678 | 806 | |
9b38096f AK |
807 | /* |
808 | * CPUID.06H.EAX[0] indicates whether the CPU has thermal | |
809 | * sensors. We check this bit only, all the early CPUs | |
810 | * without thermal sensors will be filtered out. | |
811 | */ | |
812 | if (!x86_match_cpu(coretemp_ids)) | |
813 | return -ENODEV; | |
bebe4678 RM |
814 | |
815 | err = platform_driver_register(&coretemp_driver); | |
816 | if (err) | |
817 | goto exit; | |
818 | ||
641f1456 | 819 | get_online_cpus(); |
a4659053 | 820 | for_each_online_cpu(i) |
199e0de7 | 821 | get_core_online(i); |
89a3fd35 JB |
822 | |
823 | #ifndef CONFIG_HOTPLUG_CPU | |
bebe4678 | 824 | if (list_empty(&pdev_list)) { |
641f1456 | 825 | put_online_cpus(); |
bebe4678 RM |
826 | err = -ENODEV; |
827 | goto exit_driver_unreg; | |
828 | } | |
89a3fd35 | 829 | #endif |
bebe4678 | 830 | |
bebe4678 | 831 | register_hotcpu_notifier(&coretemp_cpu_notifier); |
641f1456 | 832 | put_online_cpus(); |
bebe4678 RM |
833 | return 0; |
834 | ||
0dca94ba | 835 | #ifndef CONFIG_HOTPLUG_CPU |
89a3fd35 | 836 | exit_driver_unreg: |
bebe4678 | 837 | platform_driver_unregister(&coretemp_driver); |
0dca94ba | 838 | #endif |
bebe4678 RM |
839 | exit: |
840 | return err; | |
841 | } | |
842 | ||
843 | static void __exit coretemp_exit(void) | |
844 | { | |
845 | struct pdev_entry *p, *n; | |
17c10d61 | 846 | |
641f1456 | 847 | get_online_cpus(); |
bebe4678 | 848 | unregister_hotcpu_notifier(&coretemp_cpu_notifier); |
bebe4678 RM |
849 | mutex_lock(&pdev_list_mutex); |
850 | list_for_each_entry_safe(p, n, &pdev_list, list) { | |
851 | platform_device_unregister(p->pdev); | |
852 | list_del(&p->list); | |
853 | kfree(p); | |
854 | } | |
855 | mutex_unlock(&pdev_list_mutex); | |
641f1456 | 856 | put_online_cpus(); |
bebe4678 RM |
857 | platform_driver_unregister(&coretemp_driver); |
858 | } | |
859 | ||
860 | MODULE_AUTHOR("Rudolf Marek <r.marek@assembler.cz>"); | |
861 | MODULE_DESCRIPTION("Intel Core temperature monitor"); | |
862 | MODULE_LICENSE("GPL"); | |
863 | ||
864 | module_init(coretemp_init) | |
865 | module_exit(coretemp_exit) |