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
23#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
24
25#include <linux/module.h>
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>
37#include <linux/smp.h>
38#include <linux/moduleparam.h>
39#include <linux/pci.h>
40#include <asm/msr.h>
41#include <asm/processor.h>
42#include <asm/cpu_device_id.h>
43
44#define DRVNAME "coretemp"
45
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 */
50static int force_tjmax;
51module_param_named(tjmax, force_tjmax, int, 0444);
52MODULE_PARM_DESC(tjmax, "TjMax value in degrees Celsius");
53
54#define PKG_SYSFS_ATTR_NO 1 /* Sysfs attribute for package temp */
55#define BASE_SYSFS_ATTR_NO 2 /* Sysfs Base attr no for coretemp */
56#define NUM_REAL_CORES 128 /* Number of Real cores per cpu */
57#define CORETEMP_NAME_LENGTH 19 /* String Length of attrs */
58#define MAX_CORE_ATTRS 4 /* Maximum no of basic attrs */
59#define TOTAL_ATTRS (MAX_CORE_ATTRS + 1)
60#define MAX_CORE_DATA (NUM_REAL_CORES + BASE_SYSFS_ATTR_NO)
61
62#define TO_CORE_ID(cpu) (cpu_data(cpu).cpu_core_id)
63#define TO_ATTR_NO(cpu) (TO_CORE_ID(cpu) + BASE_SYSFS_ATTR_NO)
64
65#ifdef CONFIG_SMP
66#define for_each_sibling(i, cpu) \
67 for_each_cpu(i, topology_sibling_cpumask(cpu))
68#else
69#define for_each_sibling(i, cpu) for (i = 0; false; )
70#endif
71
72/*
73 * Per-Core Temperature Data
74 * @last_updated: The time when the current temperature value was updated
75 * earlier (in jiffies).
76 * @cpu_core_id: The CPU Core from which temperature values should be read
77 * This value is passed as "id" field to rdmsr/wrmsr functions.
78 * @status_reg: One of IA32_THERM_STATUS or IA32_PACKAGE_THERM_STATUS,
79 * from where the temperature values should be read.
80 * @attr_size: Total number of pre-core attrs displayed in the sysfs.
81 * @is_pkg_data: If this is 1, the temp_data holds pkgtemp data.
82 * Otherwise, temp_data holds coretemp data.
83 * @valid: If this is 1, the current temperature is valid.
84 */
85struct temp_data {
86 int temp;
87 int ttarget;
88 int tjmax;
89 unsigned long last_updated;
90 unsigned int cpu;
91 u32 cpu_core_id;
92 u32 status_reg;
93 int attr_size;
94 bool is_pkg_data;
95 bool valid;
96 struct sensor_device_attribute sd_attrs[TOTAL_ATTRS];
97 char attr_name[TOTAL_ATTRS][CORETEMP_NAME_LENGTH];
98 struct attribute *attrs[TOTAL_ATTRS + 1];
99 struct attribute_group attr_group;
100 struct mutex update_lock;
101};
102
103/* Platform Data per Physical CPU */
104struct platform_data {
105 struct device *hwmon_dev;
106 u16 pkg_id;
107 struct cpumask cpumask;
108 struct temp_data *core_data[MAX_CORE_DATA];
109 struct device_attribute name_attr;
110};
111
112/* Keep track of how many package pointers we allocated in init() */
113static int max_packages __read_mostly;
114/* Array of package pointers. Serialized by cpu hotplug lock */
115static struct platform_device **pkg_devices;
116
117static ssize_t show_label(struct device *dev,
118 struct device_attribute *devattr, char *buf)
119{
120 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
121 struct platform_data *pdata = dev_get_drvdata(dev);
122 struct temp_data *tdata = pdata->core_data[attr->index];
123
124 if (tdata->is_pkg_data)
125 return sprintf(buf, "Package id %u\n", pdata->pkg_id);
126
127 return sprintf(buf, "Core %u\n", tdata->cpu_core_id);
128}
129
130static ssize_t show_crit_alarm(struct device *dev,
131 struct device_attribute *devattr, char *buf)
132{
133 u32 eax, edx;
134 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
135 struct platform_data *pdata = dev_get_drvdata(dev);
136 struct temp_data *tdata = pdata->core_data[attr->index];
137
138 mutex_lock(&tdata->update_lock);
139 rdmsr_on_cpu(tdata->cpu, tdata->status_reg, &eax, &edx);
140 mutex_unlock(&tdata->update_lock);
141
142 return sprintf(buf, "%d\n", (eax >> 5) & 1);
143}
144
145static ssize_t show_tjmax(struct device *dev,
146 struct device_attribute *devattr, char *buf)
147{
148 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
149 struct platform_data *pdata = dev_get_drvdata(dev);
150
151 return sprintf(buf, "%d\n", pdata->core_data[attr->index]->tjmax);
152}
153
154static ssize_t show_ttarget(struct device *dev,
155 struct device_attribute *devattr, char *buf)
156{
157 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
158 struct platform_data *pdata = dev_get_drvdata(dev);
159
160 return sprintf(buf, "%d\n", pdata->core_data[attr->index]->ttarget);
161}
162
163static ssize_t show_temp(struct device *dev,
164 struct device_attribute *devattr, char *buf)
165{
166 u32 eax, edx;
167 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
168 struct platform_data *pdata = dev_get_drvdata(dev);
169 struct temp_data *tdata = pdata->core_data[attr->index];
170
171 mutex_lock(&tdata->update_lock);
172
173 /* Check whether the time interval has elapsed */
174 if (!tdata->valid || time_after(jiffies, tdata->last_updated + HZ)) {
175 rdmsr_on_cpu(tdata->cpu, tdata->status_reg, &eax, &edx);
176 /*
177 * Ignore the valid bit. In all observed cases the register
178 * value is either low or zero if the valid bit is 0.
179 * Return it instead of reporting an error which doesn't
180 * really help at all.
181 */
182 tdata->temp = tdata->tjmax - ((eax >> 16) & 0x7f) * 1000;
183 tdata->valid = 1;
184 tdata->last_updated = jiffies;
185 }
186
187 mutex_unlock(&tdata->update_lock);
188 return sprintf(buf, "%d\n", tdata->temp);
189}
190
191struct tjmax_pci {
192 unsigned int device;
193 int tjmax;
194};
195
196static const struct tjmax_pci tjmax_pci_table[] = {
197 { 0x0708, 110000 }, /* CE41x0 (Sodaville ) */
198 { 0x0c72, 102000 }, /* Atom S1240 (Centerton) */
199 { 0x0c73, 95000 }, /* Atom S1220 (Centerton) */
200 { 0x0c75, 95000 }, /* Atom S1260 (Centerton) */
201};
202
203struct tjmax {
204 char const *id;
205 int tjmax;
206};
207
208static const struct tjmax tjmax_table[] = {
209 { "CPU 230", 100000 }, /* Model 0x1c, stepping 2 */
210 { "CPU 330", 125000 }, /* Model 0x1c, stepping 2 */
211};
212
213struct tjmax_model {
214 u8 model;
215 u8 mask;
216 int tjmax;
217};
218
219#define ANY 0xff
220
221static const struct tjmax_model tjmax_model_table[] = {
222 { 0x1c, 10, 100000 }, /* D4xx, K4xx, N4xx, D5xx, K5xx, N5xx */
223 { 0x1c, ANY, 90000 }, /* Z5xx, N2xx, possibly others
224 * Note: Also matches 230 and 330,
225 * which are covered by tjmax_table
226 */
227 { 0x26, ANY, 90000 }, /* Atom Tunnel Creek (Exx), Lincroft (Z6xx)
228 * Note: TjMax for E6xxT is 110C, but CPU type
229 * is undetectable by software
230 */
231 { 0x27, ANY, 90000 }, /* Atom Medfield (Z2460) */
232 { 0x35, ANY, 90000 }, /* Atom Clover Trail/Cloverview (Z27x0) */
233 { 0x36, ANY, 100000 }, /* Atom Cedar Trail/Cedarview (N2xxx, D2xxx)
234 * Also matches S12x0 (stepping 9), covered by
235 * PCI table
236 */
237};
238
239static int adjust_tjmax(struct cpuinfo_x86 *c, u32 id, struct device *dev)
240{
241 /* The 100C is default for both mobile and non mobile CPUs */
242
243 int tjmax = 100000;
244 int tjmax_ee = 85000;
245 int usemsr_ee = 1;
246 int err;
247 u32 eax, edx;
248 int i;
249 u16 devfn = PCI_DEVFN(0, 0);
250 struct pci_dev *host_bridge = pci_get_domain_bus_and_slot(0, 0, devfn);
251
252 /*
253 * Explicit tjmax table entries override heuristics.
254 * First try PCI host bridge IDs, followed by model ID strings
255 * and model/stepping information.
256 */
257 if (host_bridge && host_bridge->vendor == PCI_VENDOR_ID_INTEL) {
258 for (i = 0; i < ARRAY_SIZE(tjmax_pci_table); i++) {
259 if (host_bridge->device == tjmax_pci_table[i].device)
260 return tjmax_pci_table[i].tjmax;
261 }
262 }
263
264 for (i = 0; i < ARRAY_SIZE(tjmax_table); i++) {
265 if (strstr(c->x86_model_id, tjmax_table[i].id))
266 return tjmax_table[i].tjmax;
267 }
268
269 for (i = 0; i < ARRAY_SIZE(tjmax_model_table); i++) {
270 const struct tjmax_model *tm = &tjmax_model_table[i];
271 if (c->x86_model == tm->model &&
272 (tm->mask == ANY || c->x86_stepping == tm->mask))
273 return tm->tjmax;
274 }
275
276 /* Early chips have no MSR for TjMax */
277
278 if (c->x86_model == 0xf && c->x86_stepping < 4)
279 usemsr_ee = 0;
280
281 if (c->x86_model > 0xe && usemsr_ee) {
282 u8 platform_id;
283
284 /*
285 * Now we can detect the mobile CPU using Intel provided table
286 * http://softwarecommunity.intel.com/Wiki/Mobility/720.htm
287 * For Core2 cores, check MSR 0x17, bit 28 1 = Mobile CPU
288 */
289 err = rdmsr_safe_on_cpu(id, 0x17, &eax, &edx);
290 if (err) {
291 dev_warn(dev,
292 "Unable to access MSR 0x17, assuming desktop"
293 " CPU\n");
294 usemsr_ee = 0;
295 } else if (c->x86_model < 0x17 && !(eax & 0x10000000)) {
296 /*
297 * Trust bit 28 up to Penryn, I could not find any
298 * documentation on that; if you happen to know
299 * someone at Intel please ask
300 */
301 usemsr_ee = 0;
302 } else {
303 /* Platform ID bits 52:50 (EDX starts at bit 32) */
304 platform_id = (edx >> 18) & 0x7;
305
306 /*
307 * Mobile Penryn CPU seems to be platform ID 7 or 5
308 * (guesswork)
309 */
310 if (c->x86_model == 0x17 &&
311 (platform_id == 5 || platform_id == 7)) {
312 /*
313 * If MSR EE bit is set, set it to 90 degrees C,
314 * otherwise 105 degrees C
315 */
316 tjmax_ee = 90000;
317 tjmax = 105000;
318 }
319 }
320 }
321
322 if (usemsr_ee) {
323 err = rdmsr_safe_on_cpu(id, 0xee, &eax, &edx);
324 if (err) {
325 dev_warn(dev,
326 "Unable to access MSR 0xEE, for Tjmax, left"
327 " at default\n");
328 } else if (eax & 0x40000000) {
329 tjmax = tjmax_ee;
330 }
331 } else if (tjmax == 100000) {
332 /*
333 * If we don't use msr EE it means we are desktop CPU
334 * (with exeception of Atom)
335 */
336 dev_warn(dev, "Using relative temperature scale!\n");
337 }
338
339 return tjmax;
340}
341
342static bool cpu_has_tjmax(struct cpuinfo_x86 *c)
343{
344 u8 model = c->x86_model;
345
346 return model > 0xe &&
347 model != 0x1c &&
348 model != 0x26 &&
349 model != 0x27 &&
350 model != 0x35 &&
351 model != 0x36;
352}
353
354static int get_tjmax(struct cpuinfo_x86 *c, u32 id, struct device *dev)
355{
356 int err;
357 u32 eax, edx;
358 u32 val;
359
360 /*
361 * A new feature of current Intel(R) processors, the
362 * IA32_TEMPERATURE_TARGET contains the TjMax value
363 */
364 err = rdmsr_safe_on_cpu(id, MSR_IA32_TEMPERATURE_TARGET, &eax, &edx);
365 if (err) {
366 if (cpu_has_tjmax(c))
367 dev_warn(dev, "Unable to read TjMax from CPU %u\n", id);
368 } else {
369 val = (eax >> 16) & 0xff;
370 /*
371 * If the TjMax is not plausible, an assumption
372 * will be used
373 */
374 if (val) {
375 dev_dbg(dev, "TjMax is %d degrees C\n", val);
376 return val * 1000;
377 }
378 }
379
380 if (force_tjmax) {
381 dev_notice(dev, "TjMax forced to %d degrees C by user\n",
382 force_tjmax);
383 return force_tjmax * 1000;
384 }
385
386 /*
387 * An assumption is made for early CPUs and unreadable MSR.
388 * NOTE: the calculated value may not be correct.
389 */
390 return adjust_tjmax(c, id, dev);
391}
392
393static int create_core_attrs(struct temp_data *tdata, struct device *dev,
394 int attr_no)
395{
396 int i;
397 static ssize_t (*const rd_ptr[TOTAL_ATTRS]) (struct device *dev,
398 struct device_attribute *devattr, char *buf) = {
399 show_label, show_crit_alarm, show_temp, show_tjmax,
400 show_ttarget };
401 static const char *const suffixes[TOTAL_ATTRS] = {
402 "label", "crit_alarm", "input", "crit", "max"
403 };
404
405 for (i = 0; i < tdata->attr_size; i++) {
406 snprintf(tdata->attr_name[i], CORETEMP_NAME_LENGTH,
407 "temp%d_%s", attr_no, suffixes[i]);
408 sysfs_attr_init(&tdata->sd_attrs[i].dev_attr.attr);
409 tdata->sd_attrs[i].dev_attr.attr.name = tdata->attr_name[i];
410 tdata->sd_attrs[i].dev_attr.attr.mode = 0444;
411 tdata->sd_attrs[i].dev_attr.show = rd_ptr[i];
412 tdata->sd_attrs[i].index = attr_no;
413 tdata->attrs[i] = &tdata->sd_attrs[i].dev_attr.attr;
414 }
415 tdata->attr_group.attrs = tdata->attrs;
416 return sysfs_create_group(&dev->kobj, &tdata->attr_group);
417}
418
419
420static int chk_ucode_version(unsigned int cpu)
421{
422 struct cpuinfo_x86 *c = &cpu_data(cpu);
423
424 /*
425 * Check if we have problem with errata AE18 of Core processors:
426 * Readings might stop update when processor visited too deep sleep,
427 * fixed for stepping D0 (6EC).
428 */
429 if (c->x86_model == 0xe && c->x86_stepping < 0xc && c->microcode < 0x39) {
430 pr_err("Errata AE18 not fixed, update BIOS or microcode of the CPU!\n");
431 return -ENODEV;
432 }
433 return 0;
434}
435
436static struct platform_device *coretemp_get_pdev(unsigned int cpu)
437{
438 int pkgid = topology_logical_package_id(cpu);
439
440 if (pkgid >= 0 && pkgid < max_packages)
441 return pkg_devices[pkgid];
442 return NULL;
443}
444
445static struct temp_data *init_temp_data(unsigned int cpu, int pkg_flag)
446{
447 struct temp_data *tdata;
448
449 tdata = kzalloc(sizeof(struct temp_data), GFP_KERNEL);
450 if (!tdata)
451 return NULL;
452
453 tdata->status_reg = pkg_flag ? MSR_IA32_PACKAGE_THERM_STATUS :
454 MSR_IA32_THERM_STATUS;
455 tdata->is_pkg_data = pkg_flag;
456 tdata->cpu = cpu;
457 tdata->cpu_core_id = TO_CORE_ID(cpu);
458 tdata->attr_size = MAX_CORE_ATTRS;
459 mutex_init(&tdata->update_lock);
460 return tdata;
461}
462
463static int create_core_data(struct platform_device *pdev, unsigned int cpu,
464 int pkg_flag)
465{
466 struct temp_data *tdata;
467 struct platform_data *pdata = platform_get_drvdata(pdev);
468 struct cpuinfo_x86 *c = &cpu_data(cpu);
469 u32 eax, edx;
470 int err, attr_no;
471
472 /*
473 * Find attr number for sysfs:
474 * We map the attr number to core id of the CPU
475 * The attr number is always core id + 2
476 * The Pkgtemp will always show up as temp1_*, if available
477 */
478 attr_no = pkg_flag ? PKG_SYSFS_ATTR_NO : TO_ATTR_NO(cpu);
479
480 if (attr_no > MAX_CORE_DATA - 1)
481 return -ERANGE;
482
483 tdata = init_temp_data(cpu, pkg_flag);
484 if (!tdata)
485 return -ENOMEM;
486
487 /* Test if we can access the status register */
488 err = rdmsr_safe_on_cpu(cpu, tdata->status_reg, &eax, &edx);
489 if (err)
490 goto exit_free;
491
492 /* We can access status register. Get Critical Temperature */
493 tdata->tjmax = get_tjmax(c, cpu, &pdev->dev);
494
495 /*
496 * Read the still undocumented bits 8:15 of IA32_TEMPERATURE_TARGET.
497 * The target temperature is available on older CPUs but not in this
498 * register. Atoms don't have the register at all.
499 */
500 if (c->x86_model > 0xe && c->x86_model != 0x1c) {
501 err = rdmsr_safe_on_cpu(cpu, MSR_IA32_TEMPERATURE_TARGET,
502 &eax, &edx);
503 if (!err) {
504 tdata->ttarget
505 = tdata->tjmax - ((eax >> 8) & 0xff) * 1000;
506 tdata->attr_size++;
507 }
508 }
509
510 pdata->core_data[attr_no] = tdata;
511
512 /* Create sysfs interfaces */
513 err = create_core_attrs(tdata, pdata->hwmon_dev, attr_no);
514 if (err)
515 goto exit_free;
516
517 return 0;
518exit_free:
519 pdata->core_data[attr_no] = NULL;
520 kfree(tdata);
521 return err;
522}
523
524static void
525coretemp_add_core(struct platform_device *pdev, unsigned int cpu, int pkg_flag)
526{
527 if (create_core_data(pdev, cpu, pkg_flag))
528 dev_err(&pdev->dev, "Adding Core %u failed\n", cpu);
529}
530
531static void coretemp_remove_core(struct platform_data *pdata, int indx)
532{
533 struct temp_data *tdata = pdata->core_data[indx];
534
535 /* Remove the sysfs attributes */
536 sysfs_remove_group(&pdata->hwmon_dev->kobj, &tdata->attr_group);
537
538 kfree(pdata->core_data[indx]);
539 pdata->core_data[indx] = NULL;
540}
541
542static int coretemp_probe(struct platform_device *pdev)
543{
544 struct device *dev = &pdev->dev;
545 struct platform_data *pdata;
546
547 /* Initialize the per-package data structures */
548 pdata = devm_kzalloc(dev, sizeof(struct platform_data), GFP_KERNEL);
549 if (!pdata)
550 return -ENOMEM;
551
552 pdata->pkg_id = pdev->id;
553 platform_set_drvdata(pdev, pdata);
554
555 pdata->hwmon_dev = devm_hwmon_device_register_with_groups(dev, DRVNAME,
556 pdata, NULL);
557 return PTR_ERR_OR_ZERO(pdata->hwmon_dev);
558}
559
560static int coretemp_remove(struct platform_device *pdev)
561{
562 struct platform_data *pdata = platform_get_drvdata(pdev);
563 int i;
564
565 for (i = MAX_CORE_DATA - 1; i >= 0; --i)
566 if (pdata->core_data[i])
567 coretemp_remove_core(pdata, i);
568
569 return 0;
570}
571
572static struct platform_driver coretemp_driver = {
573 .driver = {
574 .name = DRVNAME,
575 },
576 .probe = coretemp_probe,
577 .remove = coretemp_remove,
578};
579
580static struct platform_device *coretemp_device_add(unsigned int cpu)
581{
582 int err, pkgid = topology_logical_package_id(cpu);
583 struct platform_device *pdev;
584
585 if (pkgid < 0)
586 return ERR_PTR(-ENOMEM);
587
588 pdev = platform_device_alloc(DRVNAME, pkgid);
589 if (!pdev)
590 return ERR_PTR(-ENOMEM);
591
592 err = platform_device_add(pdev);
593 if (err) {
594 platform_device_put(pdev);
595 return ERR_PTR(err);
596 }
597
598 pkg_devices[pkgid] = pdev;
599 return pdev;
600}
601
602static int coretemp_cpu_online(unsigned int cpu)
603{
604 struct platform_device *pdev = coretemp_get_pdev(cpu);
605 struct cpuinfo_x86 *c = &cpu_data(cpu);
606 struct platform_data *pdata;
607
608 /*
609 * Don't execute this on resume as the offline callback did
610 * not get executed on suspend.
611 */
612 if (cpuhp_tasks_frozen)
613 return 0;
614
615 /*
616 * CPUID.06H.EAX[0] indicates whether the CPU has thermal
617 * sensors. We check this bit only, all the early CPUs
618 * without thermal sensors will be filtered out.
619 */
620 if (!cpu_has(c, X86_FEATURE_DTHERM))
621 return -ENODEV;
622
623 if (!pdev) {
624 /* Check the microcode version of the CPU */
625 if (chk_ucode_version(cpu))
626 return -EINVAL;
627
628 /*
629 * Alright, we have DTS support.
630 * We are bringing the _first_ core in this pkg
631 * online. So, initialize per-pkg data structures and
632 * then bring this core online.
633 */
634 pdev = coretemp_device_add(cpu);
635 if (IS_ERR(pdev))
636 return PTR_ERR(pdev);
637
638 /*
639 * Check whether pkgtemp support is available.
640 * If so, add interfaces for pkgtemp.
641 */
642 if (cpu_has(c, X86_FEATURE_PTS))
643 coretemp_add_core(pdev, cpu, 1);
644 }
645
646 pdata = platform_get_drvdata(pdev);
647 /*
648 * Check whether a thread sibling is already online. If not add the
649 * interface for this CPU core.
650 */
651 if (!cpumask_intersects(&pdata->cpumask, topology_sibling_cpumask(cpu)))
652 coretemp_add_core(pdev, cpu, 0);
653
654 cpumask_set_cpu(cpu, &pdata->cpumask);
655 return 0;
656}
657
658static int coretemp_cpu_offline(unsigned int cpu)
659{
660 struct platform_device *pdev = coretemp_get_pdev(cpu);
661 struct platform_data *pd;
662 struct temp_data *tdata;
663 int indx, target;
664
665 /*
666 * Don't execute this on suspend as the device remove locks
667 * up the machine.
668 */
669 if (cpuhp_tasks_frozen)
670 return 0;
671
672 /* If the physical CPU device does not exist, just return */
673 if (!pdev)
674 return 0;
675
676 /* The core id is too big, just return */
677 indx = TO_ATTR_NO(cpu);
678 if (indx > MAX_CORE_DATA - 1)
679 return 0;
680
681 pd = platform_get_drvdata(pdev);
682 tdata = pd->core_data[indx];
683
684 cpumask_clear_cpu(cpu, &pd->cpumask);
685
686 /*
687 * If this is the last thread sibling, remove the CPU core
688 * interface, If there is still a sibling online, transfer the
689 * target cpu of that core interface to it.
690 */
691 target = cpumask_any_and(&pd->cpumask, topology_sibling_cpumask(cpu));
692 if (target >= nr_cpu_ids) {
693 coretemp_remove_core(pd, indx);
694 } else if (tdata && tdata->cpu == cpu) {
695 mutex_lock(&tdata->update_lock);
696 tdata->cpu = target;
697 mutex_unlock(&tdata->update_lock);
698 }
699
700 /*
701 * If all cores in this pkg are offline, remove the device. This
702 * will invoke the platform driver remove function, which cleans up
703 * the rest.
704 */
705 if (cpumask_empty(&pd->cpumask)) {
706 pkg_devices[topology_logical_package_id(cpu)] = NULL;
707 platform_device_unregister(pdev);
708 return 0;
709 }
710
711 /*
712 * Check whether this core is the target for the package
713 * interface. We need to assign it to some other cpu.
714 */
715 tdata = pd->core_data[PKG_SYSFS_ATTR_NO];
716 if (tdata && tdata->cpu == cpu) {
717 target = cpumask_first(&pd->cpumask);
718 mutex_lock(&tdata->update_lock);
719 tdata->cpu = target;
720 mutex_unlock(&tdata->update_lock);
721 }
722 return 0;
723}
724static const struct x86_cpu_id __initconst coretemp_ids[] = {
725 { X86_VENDOR_INTEL, X86_FAMILY_ANY, X86_MODEL_ANY, X86_FEATURE_DTHERM },
726 {}
727};
728MODULE_DEVICE_TABLE(x86cpu, coretemp_ids);
729
730static enum cpuhp_state coretemp_hp_online;
731
732static int __init coretemp_init(void)
733{
734 int err;
735
736 /*
737 * CPUID.06H.EAX[0] indicates whether the CPU has thermal
738 * sensors. We check this bit only, all the early CPUs
739 * without thermal sensors will be filtered out.
740 */
741 if (!x86_match_cpu(coretemp_ids))
742 return -ENODEV;
743
744 max_packages = topology_max_packages();
745 pkg_devices = kcalloc(max_packages, sizeof(struct platform_device *),
746 GFP_KERNEL);
747 if (!pkg_devices)
748 return -ENOMEM;
749
750 err = platform_driver_register(&coretemp_driver);
751 if (err)
752 return err;
753
754 err = cpuhp_setup_state(CPUHP_AP_ONLINE_DYN, "hwmon/coretemp:online",
755 coretemp_cpu_online, coretemp_cpu_offline);
756 if (err < 0)
757 goto outdrv;
758 coretemp_hp_online = err;
759 return 0;
760
761outdrv:
762 platform_driver_unregister(&coretemp_driver);
763 kfree(pkg_devices);
764 return err;
765}
766module_init(coretemp_init)
767
768static void __exit coretemp_exit(void)
769{
770 cpuhp_remove_state(coretemp_hp_online);
771 platform_driver_unregister(&coretemp_driver);
772 kfree(pkg_devices);
773}
774module_exit(coretemp_exit)
775
776MODULE_AUTHOR("Rudolf Marek <r.marek@assembler.cz>");
777MODULE_DESCRIPTION("Intel Core temperature monitor");
778MODULE_LICENSE("GPL");
779