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1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * coretemp.c - Linux kernel module for hardware monitoring
4 *
5 * Copyright (C) 2007 Rudolf Marek <r.marek@assembler.cz>
6 *
7 * Inspired from many hwmon drivers
8 */
9
10#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
11
12#include <linux/module.h>
13#include <linux/init.h>
14#include <linux/slab.h>
15#include <linux/jiffies.h>
16#include <linux/hwmon.h>
17#include <linux/sysfs.h>
18#include <linux/hwmon-sysfs.h>
19#include <linux/err.h>
20#include <linux/mutex.h>
21#include <linux/list.h>
22#include <linux/platform_device.h>
23#include <linux/cpu.h>
24#include <linux/smp.h>
25#include <linux/moduleparam.h>
26#include <linux/pci.h>
27#include <asm/msr.h>
28#include <asm/processor.h>
29#include <asm/cpu_device_id.h>
30#include <linux/sched/isolation.h>
31
32#define DRVNAME "coretemp"
33
34/*
35 * force_tjmax only matters when TjMax can't be read from the CPU itself.
36 * When set, it replaces the driver's suboptimal heuristic.
37 */
38static int force_tjmax;
39module_param_named(tjmax, force_tjmax, int, 0444);
40MODULE_PARM_DESC(tjmax, "TjMax value in degrees Celsius");
41
42#define PKG_SYSFS_ATTR_NO 1 /* Sysfs attribute for package temp */
43#define BASE_SYSFS_ATTR_NO 2 /* Sysfs Base attr no for coretemp */
44#define NUM_REAL_CORES 512 /* Number of Real cores per cpu */
45#define CORETEMP_NAME_LENGTH 28 /* String Length of attrs */
46#define MAX_CORE_ATTRS 4 /* Maximum no of basic attrs */
47#define TOTAL_ATTRS (MAX_CORE_ATTRS + 1)
48#define MAX_CORE_DATA (NUM_REAL_CORES + BASE_SYSFS_ATTR_NO)
49
50#ifdef CONFIG_SMP
51#define for_each_sibling(i, cpu) \
52 for_each_cpu(i, topology_sibling_cpumask(cpu))
53#else
54#define for_each_sibling(i, cpu) for (i = 0; false; )
55#endif
56
57/*
58 * Per-Core Temperature Data
59 * @tjmax: The static tjmax value when tjmax cannot be retrieved from
60 * IA32_TEMPERATURE_TARGET MSR.
61 * @last_updated: The time when the current temperature value was updated
62 * earlier (in jiffies).
63 * @cpu_core_id: The CPU Core from which temperature values should be read
64 * This value is passed as "id" field to rdmsr/wrmsr functions.
65 * @status_reg: One of IA32_THERM_STATUS or IA32_PACKAGE_THERM_STATUS,
66 * from where the temperature values should be read.
67 * @attr_size: Total number of pre-core attrs displayed in the sysfs.
68 * @is_pkg_data: If this is 1, the temp_data holds pkgtemp data.
69 * Otherwise, temp_data holds coretemp data.
70 */
71struct temp_data {
72 int temp;
73 int tjmax;
74 unsigned long last_updated;
75 unsigned int cpu;
76 u32 cpu_core_id;
77 u32 status_reg;
78 int attr_size;
79 bool is_pkg_data;
80 struct sensor_device_attribute sd_attrs[TOTAL_ATTRS];
81 char attr_name[TOTAL_ATTRS][CORETEMP_NAME_LENGTH];
82 struct attribute *attrs[TOTAL_ATTRS + 1];
83 struct attribute_group attr_group;
84 struct mutex update_lock;
85};
86
87/* Platform Data per Physical CPU */
88struct platform_data {
89 struct device *hwmon_dev;
90 u16 pkg_id;
91 u16 cpu_map[NUM_REAL_CORES];
92 struct ida ida;
93 struct cpumask cpumask;
94 struct temp_data *core_data[MAX_CORE_DATA];
95 struct device_attribute name_attr;
96};
97
98struct tjmax_pci {
99 unsigned int device;
100 int tjmax;
101};
102
103static const struct tjmax_pci tjmax_pci_table[] = {
104 { 0x0708, 110000 }, /* CE41x0 (Sodaville ) */
105 { 0x0c72, 102000 }, /* Atom S1240 (Centerton) */
106 { 0x0c73, 95000 }, /* Atom S1220 (Centerton) */
107 { 0x0c75, 95000 }, /* Atom S1260 (Centerton) */
108};
109
110struct tjmax {
111 char const *id;
112 int tjmax;
113};
114
115static const struct tjmax tjmax_table[] = {
116 { "CPU 230", 100000 }, /* Model 0x1c, stepping 2 */
117 { "CPU 330", 125000 }, /* Model 0x1c, stepping 2 */
118};
119
120struct tjmax_model {
121 u8 model;
122 u8 mask;
123 int tjmax;
124};
125
126#define ANY 0xff
127
128static const struct tjmax_model tjmax_model_table[] = {
129 { 0x1c, 10, 100000 }, /* D4xx, K4xx, N4xx, D5xx, K5xx, N5xx */
130 { 0x1c, ANY, 90000 }, /* Z5xx, N2xx, possibly others
131 * Note: Also matches 230 and 330,
132 * which are covered by tjmax_table
133 */
134 { 0x26, ANY, 90000 }, /* Atom Tunnel Creek (Exx), Lincroft (Z6xx)
135 * Note: TjMax for E6xxT is 110C, but CPU type
136 * is undetectable by software
137 */
138 { 0x27, ANY, 90000 }, /* Atom Medfield (Z2460) */
139 { 0x35, ANY, 90000 }, /* Atom Clover Trail/Cloverview (Z27x0) */
140 { 0x36, ANY, 100000 }, /* Atom Cedar Trail/Cedarview (N2xxx, D2xxx)
141 * Also matches S12x0 (stepping 9), covered by
142 * PCI table
143 */
144};
145
146static int adjust_tjmax(struct cpuinfo_x86 *c, u32 id, struct device *dev)
147{
148 /* The 100C is default for both mobile and non mobile CPUs */
149
150 int tjmax = 100000;
151 int tjmax_ee = 85000;
152 int usemsr_ee = 1;
153 int err;
154 u32 eax, edx;
155 int i;
156 u16 devfn = PCI_DEVFN(0, 0);
157 struct pci_dev *host_bridge = pci_get_domain_bus_and_slot(0, 0, devfn);
158
159 /*
160 * Explicit tjmax table entries override heuristics.
161 * First try PCI host bridge IDs, followed by model ID strings
162 * and model/stepping information.
163 */
164 if (host_bridge && host_bridge->vendor == PCI_VENDOR_ID_INTEL) {
165 for (i = 0; i < ARRAY_SIZE(tjmax_pci_table); i++) {
166 if (host_bridge->device == tjmax_pci_table[i].device) {
167 pci_dev_put(host_bridge);
168 return tjmax_pci_table[i].tjmax;
169 }
170 }
171 }
172 pci_dev_put(host_bridge);
173
174 for (i = 0; i < ARRAY_SIZE(tjmax_table); i++) {
175 if (strstr(c->x86_model_id, tjmax_table[i].id))
176 return tjmax_table[i].tjmax;
177 }
178
179 for (i = 0; i < ARRAY_SIZE(tjmax_model_table); i++) {
180 const struct tjmax_model *tm = &tjmax_model_table[i];
181 if (c->x86_model == tm->model &&
182 (tm->mask == ANY || c->x86_stepping == tm->mask))
183 return tm->tjmax;
184 }
185
186 /* Early chips have no MSR for TjMax */
187
188 if (c->x86_model == 0xf && c->x86_stepping < 4)
189 usemsr_ee = 0;
190
191 if (c->x86_model > 0xe && usemsr_ee) {
192 u8 platform_id;
193
194 /*
195 * Now we can detect the mobile CPU using Intel provided table
196 * http://softwarecommunity.intel.com/Wiki/Mobility/720.htm
197 * For Core2 cores, check MSR 0x17, bit 28 1 = Mobile CPU
198 */
199 err = rdmsr_safe_on_cpu(id, 0x17, &eax, &edx);
200 if (err) {
201 dev_warn(dev,
202 "Unable to access MSR 0x17, assuming desktop"
203 " CPU\n");
204 usemsr_ee = 0;
205 } else if (c->x86_model < 0x17 && !(eax & 0x10000000)) {
206 /*
207 * Trust bit 28 up to Penryn, I could not find any
208 * documentation on that; if you happen to know
209 * someone at Intel please ask
210 */
211 usemsr_ee = 0;
212 } else {
213 /* Platform ID bits 52:50 (EDX starts at bit 32) */
214 platform_id = (edx >> 18) & 0x7;
215
216 /*
217 * Mobile Penryn CPU seems to be platform ID 7 or 5
218 * (guesswork)
219 */
220 if (c->x86_model == 0x17 &&
221 (platform_id == 5 || platform_id == 7)) {
222 /*
223 * If MSR EE bit is set, set it to 90 degrees C,
224 * otherwise 105 degrees C
225 */
226 tjmax_ee = 90000;
227 tjmax = 105000;
228 }
229 }
230 }
231
232 if (usemsr_ee) {
233 err = rdmsr_safe_on_cpu(id, 0xee, &eax, &edx);
234 if (err) {
235 dev_warn(dev,
236 "Unable to access MSR 0xEE, for Tjmax, left"
237 " at default\n");
238 } else if (eax & 0x40000000) {
239 tjmax = tjmax_ee;
240 }
241 } else if (tjmax == 100000) {
242 /*
243 * If we don't use msr EE it means we are desktop CPU
244 * (with exeception of Atom)
245 */
246 dev_warn(dev, "Using relative temperature scale!\n");
247 }
248
249 return tjmax;
250}
251
252static bool cpu_has_tjmax(struct cpuinfo_x86 *c)
253{
254 u8 model = c->x86_model;
255
256 return model > 0xe &&
257 model != 0x1c &&
258 model != 0x26 &&
259 model != 0x27 &&
260 model != 0x35 &&
261 model != 0x36;
262}
263
264static int get_tjmax(struct temp_data *tdata, struct device *dev)
265{
266 struct cpuinfo_x86 *c = &cpu_data(tdata->cpu);
267 int err;
268 u32 eax, edx;
269 u32 val;
270
271 /* use static tjmax once it is set */
272 if (tdata->tjmax)
273 return tdata->tjmax;
274
275 /*
276 * A new feature of current Intel(R) processors, the
277 * IA32_TEMPERATURE_TARGET contains the TjMax value
278 */
279 err = rdmsr_safe_on_cpu(tdata->cpu, MSR_IA32_TEMPERATURE_TARGET, &eax, &edx);
280 if (err) {
281 if (cpu_has_tjmax(c))
282 dev_warn(dev, "Unable to read TjMax from CPU %u\n", tdata->cpu);
283 } else {
284 val = (eax >> 16) & 0xff;
285 if (val)
286 return val * 1000;
287 }
288
289 if (force_tjmax) {
290 dev_notice(dev, "TjMax forced to %d degrees C by user\n",
291 force_tjmax);
292 tdata->tjmax = force_tjmax * 1000;
293 } else {
294 /*
295 * An assumption is made for early CPUs and unreadable MSR.
296 * NOTE: the calculated value may not be correct.
297 */
298 tdata->tjmax = adjust_tjmax(c, tdata->cpu, dev);
299 }
300 return tdata->tjmax;
301}
302
303static int get_ttarget(struct temp_data *tdata, struct device *dev)
304{
305 u32 eax, edx;
306 int tjmax, ttarget_offset, ret;
307
308 /*
309 * ttarget is valid only if tjmax can be retrieved from
310 * MSR_IA32_TEMPERATURE_TARGET
311 */
312 if (tdata->tjmax)
313 return -ENODEV;
314
315 ret = rdmsr_safe_on_cpu(tdata->cpu, MSR_IA32_TEMPERATURE_TARGET, &eax, &edx);
316 if (ret)
317 return ret;
318
319 tjmax = (eax >> 16) & 0xff;
320
321 /* Read the still undocumented bits 8:15 of IA32_TEMPERATURE_TARGET. */
322 ttarget_offset = (eax >> 8) & 0xff;
323
324 return (tjmax - ttarget_offset) * 1000;
325}
326
327/* Keep track of how many zone pointers we allocated in init() */
328static int max_zones __read_mostly;
329/* Array of zone pointers. Serialized by cpu hotplug lock */
330static struct platform_device **zone_devices;
331
332static ssize_t show_label(struct device *dev,
333 struct device_attribute *devattr, char *buf)
334{
335 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
336 struct platform_data *pdata = dev_get_drvdata(dev);
337 struct temp_data *tdata = pdata->core_data[attr->index];
338
339 if (tdata->is_pkg_data)
340 return sprintf(buf, "Package id %u\n", pdata->pkg_id);
341
342 return sprintf(buf, "Core %u\n", tdata->cpu_core_id);
343}
344
345static ssize_t show_crit_alarm(struct device *dev,
346 struct device_attribute *devattr, char *buf)
347{
348 u32 eax, edx;
349 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
350 struct platform_data *pdata = dev_get_drvdata(dev);
351 struct temp_data *tdata = pdata->core_data[attr->index];
352
353 mutex_lock(&tdata->update_lock);
354 rdmsr_on_cpu(tdata->cpu, tdata->status_reg, &eax, &edx);
355 mutex_unlock(&tdata->update_lock);
356
357 return sprintf(buf, "%d\n", (eax >> 5) & 1);
358}
359
360static ssize_t show_tjmax(struct device *dev,
361 struct device_attribute *devattr, char *buf)
362{
363 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
364 struct platform_data *pdata = dev_get_drvdata(dev);
365 struct temp_data *tdata = pdata->core_data[attr->index];
366 int tjmax;
367
368 mutex_lock(&tdata->update_lock);
369 tjmax = get_tjmax(tdata, dev);
370 mutex_unlock(&tdata->update_lock);
371
372 return sprintf(buf, "%d\n", tjmax);
373}
374
375static ssize_t show_ttarget(struct device *dev,
376 struct device_attribute *devattr, char *buf)
377{
378 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
379 struct platform_data *pdata = dev_get_drvdata(dev);
380 struct temp_data *tdata = pdata->core_data[attr->index];
381 int ttarget;
382
383 mutex_lock(&tdata->update_lock);
384 ttarget = get_ttarget(tdata, dev);
385 mutex_unlock(&tdata->update_lock);
386
387 if (ttarget < 0)
388 return ttarget;
389 return sprintf(buf, "%d\n", ttarget);
390}
391
392static ssize_t show_temp(struct device *dev,
393 struct device_attribute *devattr, char *buf)
394{
395 u32 eax, edx;
396 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
397 struct platform_data *pdata = dev_get_drvdata(dev);
398 struct temp_data *tdata = pdata->core_data[attr->index];
399 int tjmax;
400
401 mutex_lock(&tdata->update_lock);
402
403 tjmax = get_tjmax(tdata, dev);
404 /* Check whether the time interval has elapsed */
405 if (time_after(jiffies, tdata->last_updated + HZ)) {
406 rdmsr_on_cpu(tdata->cpu, tdata->status_reg, &eax, &edx);
407 /*
408 * Ignore the valid bit. In all observed cases the register
409 * value is either low or zero if the valid bit is 0.
410 * Return it instead of reporting an error which doesn't
411 * really help at all.
412 */
413 tdata->temp = tjmax - ((eax >> 16) & 0x7f) * 1000;
414 tdata->last_updated = jiffies;
415 }
416
417 mutex_unlock(&tdata->update_lock);
418 return sprintf(buf, "%d\n", tdata->temp);
419}
420
421static int create_core_attrs(struct temp_data *tdata, struct device *dev,
422 int index)
423{
424 int i;
425 static ssize_t (*const rd_ptr[TOTAL_ATTRS]) (struct device *dev,
426 struct device_attribute *devattr, char *buf) = {
427 show_label, show_crit_alarm, show_temp, show_tjmax,
428 show_ttarget };
429 static const char *const suffixes[TOTAL_ATTRS] = {
430 "label", "crit_alarm", "input", "crit", "max"
431 };
432
433 for (i = 0; i < tdata->attr_size; i++) {
434 /*
435 * We map the attr number to core id of the CPU
436 * The attr number is always core id + 2
437 * The Pkgtemp will always show up as temp1_*, if available
438 */
439 int attr_no = tdata->is_pkg_data ? 1 : tdata->cpu_core_id + 2;
440
441 snprintf(tdata->attr_name[i], CORETEMP_NAME_LENGTH,
442 "temp%d_%s", attr_no, suffixes[i]);
443 sysfs_attr_init(&tdata->sd_attrs[i].dev_attr.attr);
444 tdata->sd_attrs[i].dev_attr.attr.name = tdata->attr_name[i];
445 tdata->sd_attrs[i].dev_attr.attr.mode = 0444;
446 tdata->sd_attrs[i].dev_attr.show = rd_ptr[i];
447 tdata->sd_attrs[i].index = index;
448 tdata->attrs[i] = &tdata->sd_attrs[i].dev_attr.attr;
449 }
450 tdata->attr_group.attrs = tdata->attrs;
451 return sysfs_create_group(&dev->kobj, &tdata->attr_group);
452}
453
454
455static int chk_ucode_version(unsigned int cpu)
456{
457 struct cpuinfo_x86 *c = &cpu_data(cpu);
458
459 /*
460 * Check if we have problem with errata AE18 of Core processors:
461 * Readings might stop update when processor visited too deep sleep,
462 * fixed for stepping D0 (6EC).
463 */
464 if (c->x86_model == 0xe && c->x86_stepping < 0xc && c->microcode < 0x39) {
465 pr_err("Errata AE18 not fixed, update BIOS or microcode of the CPU!\n");
466 return -ENODEV;
467 }
468 return 0;
469}
470
471static struct platform_device *coretemp_get_pdev(unsigned int cpu)
472{
473 int id = topology_logical_die_id(cpu);
474
475 if (id >= 0 && id < max_zones)
476 return zone_devices[id];
477 return NULL;
478}
479
480static struct temp_data *init_temp_data(unsigned int cpu, int pkg_flag)
481{
482 struct temp_data *tdata;
483
484 tdata = kzalloc(sizeof(struct temp_data), GFP_KERNEL);
485 if (!tdata)
486 return NULL;
487
488 tdata->status_reg = pkg_flag ? MSR_IA32_PACKAGE_THERM_STATUS :
489 MSR_IA32_THERM_STATUS;
490 tdata->is_pkg_data = pkg_flag;
491 tdata->cpu = cpu;
492 tdata->cpu_core_id = topology_core_id(cpu);
493 tdata->attr_size = MAX_CORE_ATTRS;
494 mutex_init(&tdata->update_lock);
495 return tdata;
496}
497
498static int create_core_data(struct platform_device *pdev, unsigned int cpu,
499 int pkg_flag)
500{
501 struct temp_data *tdata;
502 struct platform_data *pdata = platform_get_drvdata(pdev);
503 struct cpuinfo_x86 *c = &cpu_data(cpu);
504 u32 eax, edx;
505 int err, index;
506
507 if (!housekeeping_cpu(cpu, HK_TYPE_MISC))
508 return 0;
509
510 /*
511 * Get the index of tdata in pdata->core_data[]
512 * tdata for package: pdata->core_data[1]
513 * tdata for core: pdata->core_data[2] .. pdata->core_data[NUM_REAL_CORES + 1]
514 */
515 if (pkg_flag) {
516 index = PKG_SYSFS_ATTR_NO;
517 } else {
518 index = ida_alloc_max(&pdata->ida, NUM_REAL_CORES - 1, GFP_KERNEL);
519 if (index < 0)
520 return index;
521
522 pdata->cpu_map[index] = topology_core_id(cpu);
523 index += BASE_SYSFS_ATTR_NO;
524 }
525
526 tdata = init_temp_data(cpu, pkg_flag);
527 if (!tdata) {
528 err = -ENOMEM;
529 goto ida_free;
530 }
531
532 /* Test if we can access the status register */
533 err = rdmsr_safe_on_cpu(cpu, tdata->status_reg, &eax, &edx);
534 if (err)
535 goto exit_free;
536
537 /* Make sure tdata->tjmax is a valid indicator for dynamic/static tjmax */
538 get_tjmax(tdata, &pdev->dev);
539
540 /*
541 * The target temperature is available on older CPUs but not in the
542 * MSR_IA32_TEMPERATURE_TARGET register. Atoms don't have the register
543 * at all.
544 */
545 if (c->x86_model > 0xe && c->x86_model != 0x1c)
546 if (get_ttarget(tdata, &pdev->dev) >= 0)
547 tdata->attr_size++;
548
549 pdata->core_data[index] = tdata;
550
551 /* Create sysfs interfaces */
552 err = create_core_attrs(tdata, pdata->hwmon_dev, index);
553 if (err)
554 goto exit_free;
555
556 return 0;
557exit_free:
558 pdata->core_data[index] = NULL;
559 kfree(tdata);
560ida_free:
561 if (!pkg_flag)
562 ida_free(&pdata->ida, index - BASE_SYSFS_ATTR_NO);
563 return err;
564}
565
566static void
567coretemp_add_core(struct platform_device *pdev, unsigned int cpu, int pkg_flag)
568{
569 if (create_core_data(pdev, cpu, pkg_flag))
570 dev_err(&pdev->dev, "Adding Core %u failed\n", cpu);
571}
572
573static void coretemp_remove_core(struct platform_data *pdata, int indx)
574{
575 struct temp_data *tdata = pdata->core_data[indx];
576
577 /* if we errored on add then this is already gone */
578 if (!tdata)
579 return;
580
581 /* Remove the sysfs attributes */
582 sysfs_remove_group(&pdata->hwmon_dev->kobj, &tdata->attr_group);
583
584 kfree(pdata->core_data[indx]);
585 pdata->core_data[indx] = NULL;
586
587 if (indx >= BASE_SYSFS_ATTR_NO)
588 ida_free(&pdata->ida, indx - BASE_SYSFS_ATTR_NO);
589}
590
591static int coretemp_device_add(int zoneid)
592{
593 struct platform_device *pdev;
594 struct platform_data *pdata;
595 int err;
596
597 /* Initialize the per-zone data structures */
598 pdata = kzalloc(sizeof(*pdata), GFP_KERNEL);
599 if (!pdata)
600 return -ENOMEM;
601
602 pdata->pkg_id = zoneid;
603 ida_init(&pdata->ida);
604
605 pdev = platform_device_alloc(DRVNAME, zoneid);
606 if (!pdev) {
607 err = -ENOMEM;
608 goto err_free_pdata;
609 }
610
611 err = platform_device_add(pdev);
612 if (err)
613 goto err_put_dev;
614
615 platform_set_drvdata(pdev, pdata);
616 zone_devices[zoneid] = pdev;
617 return 0;
618
619err_put_dev:
620 platform_device_put(pdev);
621err_free_pdata:
622 kfree(pdata);
623 return err;
624}
625
626static void coretemp_device_remove(int zoneid)
627{
628 struct platform_device *pdev = zone_devices[zoneid];
629 struct platform_data *pdata = platform_get_drvdata(pdev);
630
631 ida_destroy(&pdata->ida);
632 kfree(pdata);
633 platform_device_unregister(pdev);
634}
635
636static int coretemp_cpu_online(unsigned int cpu)
637{
638 struct platform_device *pdev = coretemp_get_pdev(cpu);
639 struct cpuinfo_x86 *c = &cpu_data(cpu);
640 struct platform_data *pdata;
641
642 /*
643 * Don't execute this on resume as the offline callback did
644 * not get executed on suspend.
645 */
646 if (cpuhp_tasks_frozen)
647 return 0;
648
649 /*
650 * CPUID.06H.EAX[0] indicates whether the CPU has thermal
651 * sensors. We check this bit only, all the early CPUs
652 * without thermal sensors will be filtered out.
653 */
654 if (!cpu_has(c, X86_FEATURE_DTHERM))
655 return -ENODEV;
656
657 pdata = platform_get_drvdata(pdev);
658 if (!pdata->hwmon_dev) {
659 struct device *hwmon;
660
661 /* Check the microcode version of the CPU */
662 if (chk_ucode_version(cpu))
663 return -EINVAL;
664
665 /*
666 * Alright, we have DTS support.
667 * We are bringing the _first_ core in this pkg
668 * online. So, initialize per-pkg data structures and
669 * then bring this core online.
670 */
671 hwmon = hwmon_device_register_with_groups(&pdev->dev, DRVNAME,
672 pdata, NULL);
673 if (IS_ERR(hwmon))
674 return PTR_ERR(hwmon);
675 pdata->hwmon_dev = hwmon;
676
677 /*
678 * Check whether pkgtemp support is available.
679 * If so, add interfaces for pkgtemp.
680 */
681 if (cpu_has(c, X86_FEATURE_PTS))
682 coretemp_add_core(pdev, cpu, 1);
683 }
684
685 /*
686 * Check whether a thread sibling is already online. If not add the
687 * interface for this CPU core.
688 */
689 if (!cpumask_intersects(&pdata->cpumask, topology_sibling_cpumask(cpu)))
690 coretemp_add_core(pdev, cpu, 0);
691
692 cpumask_set_cpu(cpu, &pdata->cpumask);
693 return 0;
694}
695
696static int coretemp_cpu_offline(unsigned int cpu)
697{
698 struct platform_device *pdev = coretemp_get_pdev(cpu);
699 struct platform_data *pd;
700 struct temp_data *tdata;
701 int i, indx = -1, target;
702
703 /* No need to tear down any interfaces for suspend */
704 if (cpuhp_tasks_frozen)
705 return 0;
706
707 /* If the physical CPU device does not exist, just return */
708 pd = platform_get_drvdata(pdev);
709 if (!pd->hwmon_dev)
710 return 0;
711
712 for (i = 0; i < NUM_REAL_CORES; i++) {
713 if (pd->cpu_map[i] == topology_core_id(cpu)) {
714 indx = i + BASE_SYSFS_ATTR_NO;
715 break;
716 }
717 }
718
719 /* Too many cores and this core is not populated, just return */
720 if (indx < 0)
721 return 0;
722
723 tdata = pd->core_data[indx];
724
725 cpumask_clear_cpu(cpu, &pd->cpumask);
726
727 /*
728 * If this is the last thread sibling, remove the CPU core
729 * interface, If there is still a sibling online, transfer the
730 * target cpu of that core interface to it.
731 */
732 target = cpumask_any_and(&pd->cpumask, topology_sibling_cpumask(cpu));
733 if (target >= nr_cpu_ids) {
734 coretemp_remove_core(pd, indx);
735 } else if (tdata && tdata->cpu == cpu) {
736 mutex_lock(&tdata->update_lock);
737 tdata->cpu = target;
738 mutex_unlock(&tdata->update_lock);
739 }
740
741 /*
742 * If all cores in this pkg are offline, remove the interface.
743 */
744 tdata = pd->core_data[PKG_SYSFS_ATTR_NO];
745 if (cpumask_empty(&pd->cpumask)) {
746 if (tdata)
747 coretemp_remove_core(pd, PKG_SYSFS_ATTR_NO);
748 hwmon_device_unregister(pd->hwmon_dev);
749 pd->hwmon_dev = NULL;
750 return 0;
751 }
752
753 /*
754 * Check whether this core is the target for the package
755 * interface. We need to assign it to some other cpu.
756 */
757 if (tdata && tdata->cpu == cpu) {
758 target = cpumask_first(&pd->cpumask);
759 mutex_lock(&tdata->update_lock);
760 tdata->cpu = target;
761 mutex_unlock(&tdata->update_lock);
762 }
763 return 0;
764}
765static const struct x86_cpu_id __initconst coretemp_ids[] = {
766 X86_MATCH_VENDOR_FEATURE(INTEL, X86_FEATURE_DTHERM, NULL),
767 {}
768};
769MODULE_DEVICE_TABLE(x86cpu, coretemp_ids);
770
771static enum cpuhp_state coretemp_hp_online;
772
773static int __init coretemp_init(void)
774{
775 int i, err;
776
777 /*
778 * CPUID.06H.EAX[0] indicates whether the CPU has thermal
779 * sensors. We check this bit only, all the early CPUs
780 * without thermal sensors will be filtered out.
781 */
782 if (!x86_match_cpu(coretemp_ids))
783 return -ENODEV;
784
785 max_zones = topology_max_packages() * topology_max_die_per_package();
786 zone_devices = kcalloc(max_zones, sizeof(struct platform_device *),
787 GFP_KERNEL);
788 if (!zone_devices)
789 return -ENOMEM;
790
791 for (i = 0; i < max_zones; i++) {
792 err = coretemp_device_add(i);
793 if (err)
794 goto outzone;
795 }
796
797 err = cpuhp_setup_state(CPUHP_AP_ONLINE_DYN, "hwmon/coretemp:online",
798 coretemp_cpu_online, coretemp_cpu_offline);
799 if (err < 0)
800 goto outzone;
801 coretemp_hp_online = err;
802 return 0;
803
804outzone:
805 while (i--)
806 coretemp_device_remove(i);
807 kfree(zone_devices);
808 return err;
809}
810module_init(coretemp_init)
811
812static void __exit coretemp_exit(void)
813{
814 int i;
815
816 cpuhp_remove_state(coretemp_hp_online);
817 for (i = 0; i < max_zones; i++)
818 coretemp_device_remove(i);
819 kfree(zone_devices);
820}
821module_exit(coretemp_exit)
822
823MODULE_AUTHOR("Rudolf Marek <r.marek@assembler.cz>");
824MODULE_DESCRIPTION("Intel Core temperature monitor");
825MODULE_LICENSE("GPL");
1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * coretemp.c - Linux kernel module for hardware monitoring
4 *
5 * Copyright (C) 2007 Rudolf Marek <r.marek@assembler.cz>
6 *
7 * Inspired from many hwmon drivers
8 */
9
10#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
11
12#include <linux/module.h>
13#include <linux/init.h>
14#include <linux/slab.h>
15#include <linux/jiffies.h>
16#include <linux/hwmon.h>
17#include <linux/sysfs.h>
18#include <linux/hwmon-sysfs.h>
19#include <linux/err.h>
20#include <linux/mutex.h>
21#include <linux/list.h>
22#include <linux/platform_device.h>
23#include <linux/cpu.h>
24#include <linux/smp.h>
25#include <linux/moduleparam.h>
26#include <linux/pci.h>
27#include <asm/msr.h>
28#include <asm/processor.h>
29#include <asm/cpu_device_id.h>
30
31#define DRVNAME "coretemp"
32
33/*
34 * force_tjmax only matters when TjMax can't be read from the CPU itself.
35 * When set, it replaces the driver's suboptimal heuristic.
36 */
37static int force_tjmax;
38module_param_named(tjmax, force_tjmax, int, 0444);
39MODULE_PARM_DESC(tjmax, "TjMax value in degrees Celsius");
40
41#define PKG_SYSFS_ATTR_NO 1 /* Sysfs attribute for package temp */
42#define BASE_SYSFS_ATTR_NO 2 /* Sysfs Base attr no for coretemp */
43#define NUM_REAL_CORES 128 /* Number of Real cores per cpu */
44#define CORETEMP_NAME_LENGTH 19 /* String Length of attrs */
45#define MAX_CORE_ATTRS 4 /* Maximum no of basic attrs */
46#define TOTAL_ATTRS (MAX_CORE_ATTRS + 1)
47#define MAX_CORE_DATA (NUM_REAL_CORES + BASE_SYSFS_ATTR_NO)
48
49#ifdef CONFIG_SMP
50#define for_each_sibling(i, cpu) \
51 for_each_cpu(i, topology_sibling_cpumask(cpu))
52#else
53#define for_each_sibling(i, cpu) for (i = 0; false; )
54#endif
55
56/*
57 * Per-Core Temperature Data
58 * @tjmax: The static tjmax value when tjmax cannot be retrieved from
59 * IA32_TEMPERATURE_TARGET MSR.
60 * @last_updated: The time when the current temperature value was updated
61 * earlier (in jiffies).
62 * @cpu_core_id: The CPU Core from which temperature values should be read
63 * This value is passed as "id" field to rdmsr/wrmsr functions.
64 * @status_reg: One of IA32_THERM_STATUS or IA32_PACKAGE_THERM_STATUS,
65 * from where the temperature values should be read.
66 * @attr_size: Total number of pre-core attrs displayed in the sysfs.
67 * @is_pkg_data: If this is 1, the temp_data holds pkgtemp data.
68 * Otherwise, temp_data holds coretemp data.
69 */
70struct temp_data {
71 int temp;
72 int tjmax;
73 unsigned long last_updated;
74 unsigned int cpu;
75 u32 cpu_core_id;
76 u32 status_reg;
77 int attr_size;
78 bool is_pkg_data;
79 struct sensor_device_attribute sd_attrs[TOTAL_ATTRS];
80 char attr_name[TOTAL_ATTRS][CORETEMP_NAME_LENGTH];
81 struct attribute *attrs[TOTAL_ATTRS + 1];
82 struct attribute_group attr_group;
83 struct mutex update_lock;
84};
85
86/* Platform Data per Physical CPU */
87struct platform_data {
88 struct device *hwmon_dev;
89 u16 pkg_id;
90 u16 cpu_map[NUM_REAL_CORES];
91 struct ida ida;
92 struct cpumask cpumask;
93 struct temp_data *core_data[MAX_CORE_DATA];
94 struct device_attribute name_attr;
95};
96
97struct tjmax_pci {
98 unsigned int device;
99 int tjmax;
100};
101
102static const struct tjmax_pci tjmax_pci_table[] = {
103 { 0x0708, 110000 }, /* CE41x0 (Sodaville ) */
104 { 0x0c72, 102000 }, /* Atom S1240 (Centerton) */
105 { 0x0c73, 95000 }, /* Atom S1220 (Centerton) */
106 { 0x0c75, 95000 }, /* Atom S1260 (Centerton) */
107};
108
109struct tjmax {
110 char const *id;
111 int tjmax;
112};
113
114static const struct tjmax tjmax_table[] = {
115 { "CPU 230", 100000 }, /* Model 0x1c, stepping 2 */
116 { "CPU 330", 125000 }, /* Model 0x1c, stepping 2 */
117};
118
119struct tjmax_model {
120 u8 model;
121 u8 mask;
122 int tjmax;
123};
124
125#define ANY 0xff
126
127static const struct tjmax_model tjmax_model_table[] = {
128 { 0x1c, 10, 100000 }, /* D4xx, K4xx, N4xx, D5xx, K5xx, N5xx */
129 { 0x1c, ANY, 90000 }, /* Z5xx, N2xx, possibly others
130 * Note: Also matches 230 and 330,
131 * which are covered by tjmax_table
132 */
133 { 0x26, ANY, 90000 }, /* Atom Tunnel Creek (Exx), Lincroft (Z6xx)
134 * Note: TjMax for E6xxT is 110C, but CPU type
135 * is undetectable by software
136 */
137 { 0x27, ANY, 90000 }, /* Atom Medfield (Z2460) */
138 { 0x35, ANY, 90000 }, /* Atom Clover Trail/Cloverview (Z27x0) */
139 { 0x36, ANY, 100000 }, /* Atom Cedar Trail/Cedarview (N2xxx, D2xxx)
140 * Also matches S12x0 (stepping 9), covered by
141 * PCI table
142 */
143};
144
145static int adjust_tjmax(struct cpuinfo_x86 *c, u32 id, struct device *dev)
146{
147 /* The 100C is default for both mobile and non mobile CPUs */
148
149 int tjmax = 100000;
150 int tjmax_ee = 85000;
151 int usemsr_ee = 1;
152 int err;
153 u32 eax, edx;
154 int i;
155 u16 devfn = PCI_DEVFN(0, 0);
156 struct pci_dev *host_bridge = pci_get_domain_bus_and_slot(0, 0, devfn);
157
158 /*
159 * Explicit tjmax table entries override heuristics.
160 * First try PCI host bridge IDs, followed by model ID strings
161 * and model/stepping information.
162 */
163 if (host_bridge && host_bridge->vendor == PCI_VENDOR_ID_INTEL) {
164 for (i = 0; i < ARRAY_SIZE(tjmax_pci_table); i++) {
165 if (host_bridge->device == tjmax_pci_table[i].device) {
166 pci_dev_put(host_bridge);
167 return tjmax_pci_table[i].tjmax;
168 }
169 }
170 }
171 pci_dev_put(host_bridge);
172
173 for (i = 0; i < ARRAY_SIZE(tjmax_table); i++) {
174 if (strstr(c->x86_model_id, tjmax_table[i].id))
175 return tjmax_table[i].tjmax;
176 }
177
178 for (i = 0; i < ARRAY_SIZE(tjmax_model_table); i++) {
179 const struct tjmax_model *tm = &tjmax_model_table[i];
180 if (c->x86_model == tm->model &&
181 (tm->mask == ANY || c->x86_stepping == tm->mask))
182 return tm->tjmax;
183 }
184
185 /* Early chips have no MSR for TjMax */
186
187 if (c->x86_model == 0xf && c->x86_stepping < 4)
188 usemsr_ee = 0;
189
190 if (c->x86_model > 0xe && usemsr_ee) {
191 u8 platform_id;
192
193 /*
194 * Now we can detect the mobile CPU using Intel provided table
195 * http://softwarecommunity.intel.com/Wiki/Mobility/720.htm
196 * For Core2 cores, check MSR 0x17, bit 28 1 = Mobile CPU
197 */
198 err = rdmsr_safe_on_cpu(id, 0x17, &eax, &edx);
199 if (err) {
200 dev_warn(dev,
201 "Unable to access MSR 0x17, assuming desktop"
202 " CPU\n");
203 usemsr_ee = 0;
204 } else if (c->x86_model < 0x17 && !(eax & 0x10000000)) {
205 /*
206 * Trust bit 28 up to Penryn, I could not find any
207 * documentation on that; if you happen to know
208 * someone at Intel please ask
209 */
210 usemsr_ee = 0;
211 } else {
212 /* Platform ID bits 52:50 (EDX starts at bit 32) */
213 platform_id = (edx >> 18) & 0x7;
214
215 /*
216 * Mobile Penryn CPU seems to be platform ID 7 or 5
217 * (guesswork)
218 */
219 if (c->x86_model == 0x17 &&
220 (platform_id == 5 || platform_id == 7)) {
221 /*
222 * If MSR EE bit is set, set it to 90 degrees C,
223 * otherwise 105 degrees C
224 */
225 tjmax_ee = 90000;
226 tjmax = 105000;
227 }
228 }
229 }
230
231 if (usemsr_ee) {
232 err = rdmsr_safe_on_cpu(id, 0xee, &eax, &edx);
233 if (err) {
234 dev_warn(dev,
235 "Unable to access MSR 0xEE, for Tjmax, left"
236 " at default\n");
237 } else if (eax & 0x40000000) {
238 tjmax = tjmax_ee;
239 }
240 } else if (tjmax == 100000) {
241 /*
242 * If we don't use msr EE it means we are desktop CPU
243 * (with exeception of Atom)
244 */
245 dev_warn(dev, "Using relative temperature scale!\n");
246 }
247
248 return tjmax;
249}
250
251static bool cpu_has_tjmax(struct cpuinfo_x86 *c)
252{
253 u8 model = c->x86_model;
254
255 return model > 0xe &&
256 model != 0x1c &&
257 model != 0x26 &&
258 model != 0x27 &&
259 model != 0x35 &&
260 model != 0x36;
261}
262
263static int get_tjmax(struct temp_data *tdata, struct device *dev)
264{
265 struct cpuinfo_x86 *c = &cpu_data(tdata->cpu);
266 int err;
267 u32 eax, edx;
268 u32 val;
269
270 /* use static tjmax once it is set */
271 if (tdata->tjmax)
272 return tdata->tjmax;
273
274 /*
275 * A new feature of current Intel(R) processors, the
276 * IA32_TEMPERATURE_TARGET contains the TjMax value
277 */
278 err = rdmsr_safe_on_cpu(tdata->cpu, MSR_IA32_TEMPERATURE_TARGET, &eax, &edx);
279 if (err) {
280 if (cpu_has_tjmax(c))
281 dev_warn(dev, "Unable to read TjMax from CPU %u\n", tdata->cpu);
282 } else {
283 val = (eax >> 16) & 0xff;
284 /*
285 * If the TjMax is not plausible, an assumption
286 * will be used
287 */
288 if (val) {
289 dev_dbg(dev, "TjMax is %d degrees C\n", val);
290 return val * 1000;
291 }
292 }
293
294 if (force_tjmax) {
295 dev_notice(dev, "TjMax forced to %d degrees C by user\n",
296 force_tjmax);
297 tdata->tjmax = force_tjmax * 1000;
298 } else {
299 /*
300 * An assumption is made for early CPUs and unreadable MSR.
301 * NOTE: the calculated value may not be correct.
302 */
303 tdata->tjmax = adjust_tjmax(c, tdata->cpu, dev);
304 }
305 return tdata->tjmax;
306}
307
308static int get_ttarget(struct temp_data *tdata, struct device *dev)
309{
310 u32 eax, edx;
311 int tjmax, ttarget_offset, ret;
312
313 /*
314 * ttarget is valid only if tjmax can be retrieved from
315 * MSR_IA32_TEMPERATURE_TARGET
316 */
317 if (tdata->tjmax)
318 return -ENODEV;
319
320 ret = rdmsr_safe_on_cpu(tdata->cpu, MSR_IA32_TEMPERATURE_TARGET, &eax, &edx);
321 if (ret)
322 return ret;
323
324 tjmax = (eax >> 16) & 0xff;
325
326 /* Read the still undocumented bits 8:15 of IA32_TEMPERATURE_TARGET. */
327 ttarget_offset = (eax >> 8) & 0xff;
328
329 return (tjmax - ttarget_offset) * 1000;
330}
331
332/* Keep track of how many zone pointers we allocated in init() */
333static int max_zones __read_mostly;
334/* Array of zone pointers. Serialized by cpu hotplug lock */
335static struct platform_device **zone_devices;
336
337static ssize_t show_label(struct device *dev,
338 struct device_attribute *devattr, char *buf)
339{
340 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
341 struct platform_data *pdata = dev_get_drvdata(dev);
342 struct temp_data *tdata = pdata->core_data[attr->index];
343
344 if (tdata->is_pkg_data)
345 return sprintf(buf, "Package id %u\n", pdata->pkg_id);
346
347 return sprintf(buf, "Core %u\n", tdata->cpu_core_id);
348}
349
350static ssize_t show_crit_alarm(struct device *dev,
351 struct device_attribute *devattr, char *buf)
352{
353 u32 eax, edx;
354 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
355 struct platform_data *pdata = dev_get_drvdata(dev);
356 struct temp_data *tdata = pdata->core_data[attr->index];
357
358 mutex_lock(&tdata->update_lock);
359 rdmsr_on_cpu(tdata->cpu, tdata->status_reg, &eax, &edx);
360 mutex_unlock(&tdata->update_lock);
361
362 return sprintf(buf, "%d\n", (eax >> 5) & 1);
363}
364
365static ssize_t show_tjmax(struct device *dev,
366 struct device_attribute *devattr, char *buf)
367{
368 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
369 struct platform_data *pdata = dev_get_drvdata(dev);
370 struct temp_data *tdata = pdata->core_data[attr->index];
371 int tjmax;
372
373 mutex_lock(&tdata->update_lock);
374 tjmax = get_tjmax(tdata, dev);
375 mutex_unlock(&tdata->update_lock);
376
377 return sprintf(buf, "%d\n", tjmax);
378}
379
380static ssize_t show_ttarget(struct device *dev,
381 struct device_attribute *devattr, char *buf)
382{
383 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
384 struct platform_data *pdata = dev_get_drvdata(dev);
385 struct temp_data *tdata = pdata->core_data[attr->index];
386 int ttarget;
387
388 mutex_lock(&tdata->update_lock);
389 ttarget = get_ttarget(tdata, dev);
390 mutex_unlock(&tdata->update_lock);
391
392 if (ttarget < 0)
393 return ttarget;
394 return sprintf(buf, "%d\n", ttarget);
395}
396
397static ssize_t show_temp(struct device *dev,
398 struct device_attribute *devattr, char *buf)
399{
400 u32 eax, edx;
401 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
402 struct platform_data *pdata = dev_get_drvdata(dev);
403 struct temp_data *tdata = pdata->core_data[attr->index];
404 int tjmax;
405
406 mutex_lock(&tdata->update_lock);
407
408 tjmax = get_tjmax(tdata, dev);
409 /* Check whether the time interval has elapsed */
410 if (time_after(jiffies, tdata->last_updated + HZ)) {
411 rdmsr_on_cpu(tdata->cpu, tdata->status_reg, &eax, &edx);
412 /*
413 * Ignore the valid bit. In all observed cases the register
414 * value is either low or zero if the valid bit is 0.
415 * Return it instead of reporting an error which doesn't
416 * really help at all.
417 */
418 tdata->temp = tjmax - ((eax >> 16) & 0x7f) * 1000;
419 tdata->last_updated = jiffies;
420 }
421
422 mutex_unlock(&tdata->update_lock);
423 return sprintf(buf, "%d\n", tdata->temp);
424}
425
426static int create_core_attrs(struct temp_data *tdata, struct device *dev,
427 int attr_no)
428{
429 int i;
430 static ssize_t (*const rd_ptr[TOTAL_ATTRS]) (struct device *dev,
431 struct device_attribute *devattr, char *buf) = {
432 show_label, show_crit_alarm, show_temp, show_tjmax,
433 show_ttarget };
434 static const char *const suffixes[TOTAL_ATTRS] = {
435 "label", "crit_alarm", "input", "crit", "max"
436 };
437
438 for (i = 0; i < tdata->attr_size; i++) {
439 snprintf(tdata->attr_name[i], CORETEMP_NAME_LENGTH,
440 "temp%d_%s", attr_no, suffixes[i]);
441 sysfs_attr_init(&tdata->sd_attrs[i].dev_attr.attr);
442 tdata->sd_attrs[i].dev_attr.attr.name = tdata->attr_name[i];
443 tdata->sd_attrs[i].dev_attr.attr.mode = 0444;
444 tdata->sd_attrs[i].dev_attr.show = rd_ptr[i];
445 tdata->sd_attrs[i].index = attr_no;
446 tdata->attrs[i] = &tdata->sd_attrs[i].dev_attr.attr;
447 }
448 tdata->attr_group.attrs = tdata->attrs;
449 return sysfs_create_group(&dev->kobj, &tdata->attr_group);
450}
451
452
453static int chk_ucode_version(unsigned int cpu)
454{
455 struct cpuinfo_x86 *c = &cpu_data(cpu);
456
457 /*
458 * Check if we have problem with errata AE18 of Core processors:
459 * Readings might stop update when processor visited too deep sleep,
460 * fixed for stepping D0 (6EC).
461 */
462 if (c->x86_model == 0xe && c->x86_stepping < 0xc && c->microcode < 0x39) {
463 pr_err("Errata AE18 not fixed, update BIOS or microcode of the CPU!\n");
464 return -ENODEV;
465 }
466 return 0;
467}
468
469static struct platform_device *coretemp_get_pdev(unsigned int cpu)
470{
471 int id = topology_logical_die_id(cpu);
472
473 if (id >= 0 && id < max_zones)
474 return zone_devices[id];
475 return NULL;
476}
477
478static struct temp_data *init_temp_data(unsigned int cpu, int pkg_flag)
479{
480 struct temp_data *tdata;
481
482 tdata = kzalloc(sizeof(struct temp_data), GFP_KERNEL);
483 if (!tdata)
484 return NULL;
485
486 tdata->status_reg = pkg_flag ? MSR_IA32_PACKAGE_THERM_STATUS :
487 MSR_IA32_THERM_STATUS;
488 tdata->is_pkg_data = pkg_flag;
489 tdata->cpu = cpu;
490 tdata->cpu_core_id = topology_core_id(cpu);
491 tdata->attr_size = MAX_CORE_ATTRS;
492 mutex_init(&tdata->update_lock);
493 return tdata;
494}
495
496static int create_core_data(struct platform_device *pdev, unsigned int cpu,
497 int pkg_flag)
498{
499 struct temp_data *tdata;
500 struct platform_data *pdata = platform_get_drvdata(pdev);
501 struct cpuinfo_x86 *c = &cpu_data(cpu);
502 u32 eax, edx;
503 int err, index, attr_no;
504
505 /*
506 * Find attr number for sysfs:
507 * We map the attr number to core id of the CPU
508 * The attr number is always core id + 2
509 * The Pkgtemp will always show up as temp1_*, if available
510 */
511 if (pkg_flag) {
512 attr_no = PKG_SYSFS_ATTR_NO;
513 } else {
514 index = ida_alloc(&pdata->ida, GFP_KERNEL);
515 if (index < 0)
516 return index;
517 pdata->cpu_map[index] = topology_core_id(cpu);
518 attr_no = index + BASE_SYSFS_ATTR_NO;
519 }
520
521 if (attr_no > MAX_CORE_DATA - 1) {
522 err = -ERANGE;
523 goto ida_free;
524 }
525
526 tdata = init_temp_data(cpu, pkg_flag);
527 if (!tdata) {
528 err = -ENOMEM;
529 goto ida_free;
530 }
531
532 /* Test if we can access the status register */
533 err = rdmsr_safe_on_cpu(cpu, tdata->status_reg, &eax, &edx);
534 if (err)
535 goto exit_free;
536
537 /* Make sure tdata->tjmax is a valid indicator for dynamic/static tjmax */
538 get_tjmax(tdata, &pdev->dev);
539
540 /*
541 * The target temperature is available on older CPUs but not in the
542 * MSR_IA32_TEMPERATURE_TARGET register. Atoms don't have the register
543 * at all.
544 */
545 if (c->x86_model > 0xe && c->x86_model != 0x1c)
546 if (get_ttarget(tdata, &pdev->dev) >= 0)
547 tdata->attr_size++;
548
549 pdata->core_data[attr_no] = tdata;
550
551 /* Create sysfs interfaces */
552 err = create_core_attrs(tdata, pdata->hwmon_dev, attr_no);
553 if (err)
554 goto exit_free;
555
556 return 0;
557exit_free:
558 pdata->core_data[attr_no] = NULL;
559 kfree(tdata);
560ida_free:
561 if (!pkg_flag)
562 ida_free(&pdata->ida, index);
563 return err;
564}
565
566static void
567coretemp_add_core(struct platform_device *pdev, unsigned int cpu, int pkg_flag)
568{
569 if (create_core_data(pdev, cpu, pkg_flag))
570 dev_err(&pdev->dev, "Adding Core %u failed\n", cpu);
571}
572
573static void coretemp_remove_core(struct platform_data *pdata, int indx)
574{
575 struct temp_data *tdata = pdata->core_data[indx];
576
577 /* if we errored on add then this is already gone */
578 if (!tdata)
579 return;
580
581 /* Remove the sysfs attributes */
582 sysfs_remove_group(&pdata->hwmon_dev->kobj, &tdata->attr_group);
583
584 kfree(pdata->core_data[indx]);
585 pdata->core_data[indx] = NULL;
586
587 if (indx >= BASE_SYSFS_ATTR_NO)
588 ida_free(&pdata->ida, indx - BASE_SYSFS_ATTR_NO);
589}
590
591static int coretemp_probe(struct platform_device *pdev)
592{
593 struct device *dev = &pdev->dev;
594 struct platform_data *pdata;
595
596 /* Initialize the per-zone data structures */
597 pdata = devm_kzalloc(dev, sizeof(struct platform_data), GFP_KERNEL);
598 if (!pdata)
599 return -ENOMEM;
600
601 pdata->pkg_id = pdev->id;
602 ida_init(&pdata->ida);
603 platform_set_drvdata(pdev, pdata);
604
605 pdata->hwmon_dev = devm_hwmon_device_register_with_groups(dev, DRVNAME,
606 pdata, NULL);
607 return PTR_ERR_OR_ZERO(pdata->hwmon_dev);
608}
609
610static int coretemp_remove(struct platform_device *pdev)
611{
612 struct platform_data *pdata = platform_get_drvdata(pdev);
613 int i;
614
615 for (i = MAX_CORE_DATA - 1; i >= 0; --i)
616 if (pdata->core_data[i])
617 coretemp_remove_core(pdata, i);
618
619 ida_destroy(&pdata->ida);
620 return 0;
621}
622
623static struct platform_driver coretemp_driver = {
624 .driver = {
625 .name = DRVNAME,
626 },
627 .probe = coretemp_probe,
628 .remove = coretemp_remove,
629};
630
631static struct platform_device *coretemp_device_add(unsigned int cpu)
632{
633 int err, zoneid = topology_logical_die_id(cpu);
634 struct platform_device *pdev;
635
636 if (zoneid < 0)
637 return ERR_PTR(-ENOMEM);
638
639 pdev = platform_device_alloc(DRVNAME, zoneid);
640 if (!pdev)
641 return ERR_PTR(-ENOMEM);
642
643 err = platform_device_add(pdev);
644 if (err) {
645 platform_device_put(pdev);
646 return ERR_PTR(err);
647 }
648
649 zone_devices[zoneid] = pdev;
650 return pdev;
651}
652
653static int coretemp_cpu_online(unsigned int cpu)
654{
655 struct platform_device *pdev = coretemp_get_pdev(cpu);
656 struct cpuinfo_x86 *c = &cpu_data(cpu);
657 struct platform_data *pdata;
658
659 /*
660 * Don't execute this on resume as the offline callback did
661 * not get executed on suspend.
662 */
663 if (cpuhp_tasks_frozen)
664 return 0;
665
666 /*
667 * CPUID.06H.EAX[0] indicates whether the CPU has thermal
668 * sensors. We check this bit only, all the early CPUs
669 * without thermal sensors will be filtered out.
670 */
671 if (!cpu_has(c, X86_FEATURE_DTHERM))
672 return -ENODEV;
673
674 if (!pdev) {
675 /* Check the microcode version of the CPU */
676 if (chk_ucode_version(cpu))
677 return -EINVAL;
678
679 /*
680 * Alright, we have DTS support.
681 * We are bringing the _first_ core in this pkg
682 * online. So, initialize per-pkg data structures and
683 * then bring this core online.
684 */
685 pdev = coretemp_device_add(cpu);
686 if (IS_ERR(pdev))
687 return PTR_ERR(pdev);
688
689 /*
690 * Check whether pkgtemp support is available.
691 * If so, add interfaces for pkgtemp.
692 */
693 if (cpu_has(c, X86_FEATURE_PTS))
694 coretemp_add_core(pdev, cpu, 1);
695 }
696
697 pdata = platform_get_drvdata(pdev);
698 /*
699 * Check whether a thread sibling is already online. If not add the
700 * interface for this CPU core.
701 */
702 if (!cpumask_intersects(&pdata->cpumask, topology_sibling_cpumask(cpu)))
703 coretemp_add_core(pdev, cpu, 0);
704
705 cpumask_set_cpu(cpu, &pdata->cpumask);
706 return 0;
707}
708
709static int coretemp_cpu_offline(unsigned int cpu)
710{
711 struct platform_device *pdev = coretemp_get_pdev(cpu);
712 struct platform_data *pd;
713 struct temp_data *tdata;
714 int i, indx = -1, target;
715
716 /*
717 * Don't execute this on suspend as the device remove locks
718 * up the machine.
719 */
720 if (cpuhp_tasks_frozen)
721 return 0;
722
723 /* If the physical CPU device does not exist, just return */
724 if (!pdev)
725 return 0;
726
727 pd = platform_get_drvdata(pdev);
728
729 for (i = 0; i < NUM_REAL_CORES; i++) {
730 if (pd->cpu_map[i] == topology_core_id(cpu)) {
731 indx = i + BASE_SYSFS_ATTR_NO;
732 break;
733 }
734 }
735
736 /* Too many cores and this core is not populated, just return */
737 if (indx < 0)
738 return 0;
739
740 tdata = pd->core_data[indx];
741
742 cpumask_clear_cpu(cpu, &pd->cpumask);
743
744 /*
745 * If this is the last thread sibling, remove the CPU core
746 * interface, If there is still a sibling online, transfer the
747 * target cpu of that core interface to it.
748 */
749 target = cpumask_any_and(&pd->cpumask, topology_sibling_cpumask(cpu));
750 if (target >= nr_cpu_ids) {
751 coretemp_remove_core(pd, indx);
752 } else if (tdata && tdata->cpu == cpu) {
753 mutex_lock(&tdata->update_lock);
754 tdata->cpu = target;
755 mutex_unlock(&tdata->update_lock);
756 }
757
758 /*
759 * If all cores in this pkg are offline, remove the device. This
760 * will invoke the platform driver remove function, which cleans up
761 * the rest.
762 */
763 if (cpumask_empty(&pd->cpumask)) {
764 zone_devices[topology_logical_die_id(cpu)] = NULL;
765 platform_device_unregister(pdev);
766 return 0;
767 }
768
769 /*
770 * Check whether this core is the target for the package
771 * interface. We need to assign it to some other cpu.
772 */
773 tdata = pd->core_data[PKG_SYSFS_ATTR_NO];
774 if (tdata && tdata->cpu == cpu) {
775 target = cpumask_first(&pd->cpumask);
776 mutex_lock(&tdata->update_lock);
777 tdata->cpu = target;
778 mutex_unlock(&tdata->update_lock);
779 }
780 return 0;
781}
782static const struct x86_cpu_id __initconst coretemp_ids[] = {
783 X86_MATCH_VENDOR_FEATURE(INTEL, X86_FEATURE_DTHERM, NULL),
784 {}
785};
786MODULE_DEVICE_TABLE(x86cpu, coretemp_ids);
787
788static enum cpuhp_state coretemp_hp_online;
789
790static int __init coretemp_init(void)
791{
792 int err;
793
794 /*
795 * CPUID.06H.EAX[0] indicates whether the CPU has thermal
796 * sensors. We check this bit only, all the early CPUs
797 * without thermal sensors will be filtered out.
798 */
799 if (!x86_match_cpu(coretemp_ids))
800 return -ENODEV;
801
802 max_zones = topology_max_packages() * topology_max_die_per_package();
803 zone_devices = kcalloc(max_zones, sizeof(struct platform_device *),
804 GFP_KERNEL);
805 if (!zone_devices)
806 return -ENOMEM;
807
808 err = platform_driver_register(&coretemp_driver);
809 if (err)
810 goto outzone;
811
812 err = cpuhp_setup_state(CPUHP_AP_ONLINE_DYN, "hwmon/coretemp:online",
813 coretemp_cpu_online, coretemp_cpu_offline);
814 if (err < 0)
815 goto outdrv;
816 coretemp_hp_online = err;
817 return 0;
818
819outdrv:
820 platform_driver_unregister(&coretemp_driver);
821outzone:
822 kfree(zone_devices);
823 return err;
824}
825module_init(coretemp_init)
826
827static void __exit coretemp_exit(void)
828{
829 cpuhp_remove_state(coretemp_hp_online);
830 platform_driver_unregister(&coretemp_driver);
831 kfree(zone_devices);
832}
833module_exit(coretemp_exit)
834
835MODULE_AUTHOR("Rudolf Marek <r.marek@assembler.cz>");
836MODULE_DESCRIPTION("Intel Core temperature monitor");
837MODULE_LICENSE("GPL");