projects/linux·blob master · refs

879 lines · 21.0 KiB

1// SPDX-License-Identifier: GPL-2.0
2/*
3 * thermal.c - sysfs interface of thermal devices
4 *
5 * Copyright (C) 2016 Eduardo Valentin <[email protected]>
6 *
7 * Highly based on original thermal_core.c
8 * Copyright (C) 2008 Intel Corp
9 * Copyright (C) 2008 Zhang Rui <[email protected]>
10 * Copyright (C) 2008 Sujith Thomas <[email protected]>
11 */
12
13#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
14
15#include <linux/container_of.h>
16#include <linux/sysfs.h>
17#include <linux/device.h>
18#include <linux/err.h>
19#include <linux/slab.h>
20#include <linux/string.h>
21#include <linux/string_choices.h>
22#include <linux/jiffies.h>
23
24#include "thermal_core.h"
25
26/* sys I/F for thermal zone */
27
28static ssize_t
29type_show(struct device *dev, struct device_attribute *attr, char *buf)
30{
31 struct thermal_zone_device *tz = to_thermal_zone(dev);
32
33 return sysfs_emit(buf, "%s\n", tz->type);
34}
35
36static ssize_t
37temp_show(struct device *dev, struct device_attribute *attr, char *buf)
38{
39 struct thermal_zone_device *tz = to_thermal_zone(dev);
40 int temperature, ret;
41
42 ret = thermal_zone_get_temp(tz, &temperature);
43
44 if (!ret)
45 return sysfs_emit(buf, "%d\n", temperature);
46
47 if (ret == -EAGAIN)
48 return -ENODATA;
49
50 return ret;
51}
52
53static ssize_t
54mode_show(struct device *dev, struct device_attribute *attr, char *buf)
55{
56 struct thermal_zone_device *tz = to_thermal_zone(dev);
57
58 guard(thermal_zone)(tz);
59
60 return sysfs_emit(buf, "%s\n",
61 str_enabled_disabled(tz->mode == THERMAL_DEVICE_ENABLED));
62}
63
64static ssize_t
65mode_store(struct device *dev, struct device_attribute *attr,
66 const char *buf, size_t count)
67{
68 struct thermal_zone_device *tz = to_thermal_zone(dev);
69 int result;
70
71 if (!strncmp(buf, "enabled", sizeof("enabled") - 1))
72 result = thermal_zone_device_enable(tz);
73 else if (!strncmp(buf, "disabled", sizeof("disabled") - 1))
74 result = thermal_zone_device_disable(tz);
75 else
76 result = -EINVAL;
77
78 if (result)
79 return result;
80
81 return count;
82}
83
84#define thermal_trip_of_attr(_ptr_, _attr_) \
85 ({ \
86 struct thermal_trip_desc *td; \
87 \
88 td = container_of(_ptr_, struct thermal_trip_desc, \
89 trip_attrs._attr_.attr); \
90 &td->trip; \
91 })
92
93static ssize_t
94trip_point_type_show(struct device *dev, struct device_attribute *attr,
95 char *buf)
96{
97 struct thermal_trip *trip = thermal_trip_of_attr(attr, type);
98
99 return sysfs_emit(buf, "%s\n", thermal_trip_type_name(trip->type));
100}
101
102static ssize_t
103trip_point_temp_store(struct device *dev, struct device_attribute *attr,
104 const char *buf, size_t count)
105{
106 struct thermal_trip *trip = thermal_trip_of_attr(attr, temp);
107 struct thermal_zone_device *tz = to_thermal_zone(dev);
108 int temp;
109
110 if (kstrtoint(buf, 10, &temp))
111 return -EINVAL;
112
113 guard(thermal_zone)(tz);
114
115 if (temp == trip->temperature)
116 return count;
117
118 /* Arrange the condition to avoid integer overflows. */
119 if (temp != THERMAL_TEMP_INVALID &&
120 temp <= trip->hysteresis + THERMAL_TEMP_INVALID)
121 return -EINVAL;
122
123 if (tz->ops.set_trip_temp) {
124 int ret;
125
126 ret = tz->ops.set_trip_temp(tz, trip, temp);
127 if (ret)
128 return ret;
129 }
130
131 thermal_zone_set_trip_temp(tz, trip, temp);
132
133 __thermal_zone_device_update(tz, THERMAL_TRIP_CHANGED);
134
135 return count;
136}
137
138static ssize_t
139trip_point_temp_show(struct device *dev, struct device_attribute *attr,
140 char *buf)
141{
142 struct thermal_trip *trip = thermal_trip_of_attr(attr, temp);
143
144 return sysfs_emit(buf, "%d\n", READ_ONCE(trip->temperature));
145}
146
147static ssize_t
148trip_point_hyst_store(struct device *dev, struct device_attribute *attr,
149 const char *buf, size_t count)
150{
151 struct thermal_trip *trip = thermal_trip_of_attr(attr, hyst);
152 struct thermal_zone_device *tz = to_thermal_zone(dev);
153 int hyst;
154
155 if (kstrtoint(buf, 10, &hyst) || hyst < 0)
156 return -EINVAL;
157
158 guard(thermal_zone)(tz);
159
160 if (hyst == trip->hysteresis)
161 return count;
162
163 /*
164 * Allow the hysteresis to be updated when the temperature is invalid
165 * to allow user space to avoid having to adjust hysteresis after a
166 * valid temperature has been set, but in that case just change the
167 * value and do nothing else.
168 */
169 if (trip->temperature == THERMAL_TEMP_INVALID) {
170 WRITE_ONCE(trip->hysteresis, hyst);
171 return count;
172 }
173
174 if (trip->temperature - hyst <= THERMAL_TEMP_INVALID)
175 return -EINVAL;
176
177 thermal_zone_set_trip_hyst(tz, trip, hyst);
178
179 __thermal_zone_device_update(tz, THERMAL_TRIP_CHANGED);
180
181 return count;
182}
183
184static ssize_t
185trip_point_hyst_show(struct device *dev, struct device_attribute *attr,
186 char *buf)
187{
188 struct thermal_trip *trip = thermal_trip_of_attr(attr, hyst);
189
190 return sysfs_emit(buf, "%d\n", READ_ONCE(trip->hysteresis));
191}
192
193static ssize_t
194policy_store(struct device *dev, struct device_attribute *attr,
195 const char *buf, size_t count)
196{
197 struct thermal_zone_device *tz = to_thermal_zone(dev);
198 char name[THERMAL_NAME_LENGTH];
199 int ret;
200
201 strscpy(name, buf);
202
203 ret = thermal_zone_device_set_policy(tz, name);
204 if (!ret)
205 ret = count;
206
207 return ret;
208}
209
210static ssize_t
211policy_show(struct device *dev, struct device_attribute *devattr, char *buf)
212{
213 struct thermal_zone_device *tz = to_thermal_zone(dev);
214
215 return sysfs_emit(buf, "%s\n", tz->governor->name);
216}
217
218static ssize_t
219available_policies_show(struct device *dev, struct device_attribute *devattr,
220 char *buf)
221{
222 return thermal_build_list_of_policies(buf);
223}
224
225#if (IS_ENABLED(CONFIG_THERMAL_EMULATION))
226static ssize_t
227emul_temp_store(struct device *dev, struct device_attribute *attr,
228 const char *buf, size_t count)
229{
230 struct thermal_zone_device *tz = to_thermal_zone(dev);
231 int temperature;
232
233 if (kstrtoint(buf, 10, &temperature))
234 return -EINVAL;
235
236 guard(thermal_zone)(tz);
237
238 if (tz->ops.set_emul_temp) {
239 int ret;
240
241 ret = tz->ops.set_emul_temp(tz, temperature);
242 if (ret)
243 return ret;
244 } else {
245 tz->emul_temperature = temperature;
246 }
247
248 __thermal_zone_device_update(tz, THERMAL_EVENT_UNSPECIFIED);
249
250 return count;
251}
252static DEVICE_ATTR_WO(emul_temp);
253#endif
254
255static ssize_t
256sustainable_power_show(struct device *dev, struct device_attribute *devattr,
257 char *buf)
258{
259 struct thermal_zone_device *tz = to_thermal_zone(dev);
260
261 if (tz->tzp)
262 return sysfs_emit(buf, "%u\n", tz->tzp->sustainable_power);
263 else
264 return -EIO;
265}
266
267static ssize_t
268sustainable_power_store(struct device *dev, struct device_attribute *devattr,
269 const char *buf, size_t count)
270{
271 struct thermal_zone_device *tz = to_thermal_zone(dev);
272 u32 sustainable_power;
273
274 if (!tz->tzp)
275 return -EIO;
276
277 if (kstrtou32(buf, 10, &sustainable_power))
278 return -EINVAL;
279
280 tz->tzp->sustainable_power = sustainable_power;
281
282 return count;
283}
284
285#define create_s32_tzp_attr(name) \
286 static ssize_t \
287 name##_show(struct device *dev, struct device_attribute *devattr, \
288 char *buf) \
289 { \
290 struct thermal_zone_device *tz = to_thermal_zone(dev); \
291 \
292 if (tz->tzp) \
293 return sysfs_emit(buf, "%d\n", tz->tzp->name); \
294 else \
295 return -EIO; \
296 } \
297 \
298 static ssize_t \
299 name##_store(struct device *dev, struct device_attribute *devattr, \
300 const char *buf, size_t count) \
301 { \
302 struct thermal_zone_device *tz = to_thermal_zone(dev); \
303 s32 value; \
304 \
305 if (!tz->tzp) \
306 return -EIO; \
307 \
308 if (kstrtos32(buf, 10, &value)) \
309 return -EINVAL; \
310 \
311 tz->tzp->name = value; \
312 \
313 return count; \
314 } \
315 static DEVICE_ATTR_RW(name)
316
317create_s32_tzp_attr(k_po);
318create_s32_tzp_attr(k_pu);
319create_s32_tzp_attr(k_i);
320create_s32_tzp_attr(k_d);
321create_s32_tzp_attr(integral_cutoff);
322create_s32_tzp_attr(slope);
323create_s32_tzp_attr(offset);
324#undef create_s32_tzp_attr
325
326/*
327 * These are thermal zone device attributes that will always be present.
328 * All the attributes created for tzp (create_s32_tzp_attr) also are always
329 * present on the sysfs interface.
330 */
331static DEVICE_ATTR_RO(type);
332static DEVICE_ATTR_RO(temp);
333static DEVICE_ATTR_RW(policy);
334static DEVICE_ATTR_RO(available_policies);
335static DEVICE_ATTR_RW(sustainable_power);
336
337/* These thermal zone device attributes are created based on conditions */
338static DEVICE_ATTR_RW(mode);
339
340/* These attributes are unconditionally added to a thermal zone */
341static struct attribute *thermal_zone_dev_attrs[] = {
342 &dev_attr_type.attr,
343 &dev_attr_temp.attr,
344#if (IS_ENABLED(CONFIG_THERMAL_EMULATION))
345 &dev_attr_emul_temp.attr,
346#endif
347 &dev_attr_policy.attr,
348 &dev_attr_available_policies.attr,
349 &dev_attr_sustainable_power.attr,
350 &dev_attr_k_po.attr,
351 &dev_attr_k_pu.attr,
352 &dev_attr_k_i.attr,
353 &dev_attr_k_d.attr,
354 &dev_attr_integral_cutoff.attr,
355 &dev_attr_slope.attr,
356 &dev_attr_offset.attr,
357 NULL,
358};
359
360static const struct attribute_group thermal_zone_attribute_group = {
361 .attrs = thermal_zone_dev_attrs,
362};
363
364static struct attribute *thermal_zone_mode_attrs[] = {
365 &dev_attr_mode.attr,
366 NULL,
367};
368
369static const struct attribute_group thermal_zone_mode_attribute_group = {
370 .attrs = thermal_zone_mode_attrs,
371};
372
373static const struct attribute_group *thermal_zone_attribute_groups[] = {
374 &thermal_zone_attribute_group,
375 &thermal_zone_mode_attribute_group,
376 /* This is not NULL terminated as we create the group dynamically */
377};
378
379/**
380 * create_trip_attrs() - create attributes for trip points
381 * @tz: the thermal zone device
382 *
383 * helper function to instantiate sysfs entries for every trip
384 * point and its properties of a struct thermal_zone_device.
385 *
386 * Return: 0 on success, the proper error value otherwise.
387 */
388static int create_trip_attrs(struct thermal_zone_device *tz)
389{
390 struct thermal_trip_desc *td;
391 struct attribute **attrs;
392 int i;
393
394 attrs = kzalloc_objs(*attrs, tz->num_trips * 3 + 1);
395 if (!attrs)
396 return -ENOMEM;
397
398 i = 0;
399 for_each_trip_desc(tz, td) {
400 struct thermal_trip_attrs *trip_attrs = &td->trip_attrs;
401
402 /* create trip type attribute */
403 scnprintf(trip_attrs->type.name, sizeof(trip_attrs->type.name),
404 "trip_point_%d_type", i);
405
406 sysfs_attr_init(&trip_attrs->type.attr.attr);
407 trip_attrs->type.attr.attr.name = trip_attrs->type.name;
408 trip_attrs->type.attr.attr.mode = S_IRUGO;
409 trip_attrs->type.attr.show = trip_point_type_show;
410 attrs[i] = &trip_attrs->type.attr.attr;
411
412 /* create trip temp attribute */
413 scnprintf(trip_attrs->temp.name, sizeof(trip_attrs->temp.name),
414 "trip_point_%d_temp", i);
415
416 sysfs_attr_init(&trip_attrs->temp.attr.attr);
417 trip_attrs->temp.attr.attr.name = trip_attrs->temp.name;
418 trip_attrs->temp.attr.attr.mode = S_IRUGO;
419 trip_attrs->temp.attr.show = trip_point_temp_show;
420 if (td->trip.flags & THERMAL_TRIP_FLAG_RW_TEMP) {
421 trip_attrs->temp.attr.attr.mode |= S_IWUSR;
422 trip_attrs->temp.attr.store = trip_point_temp_store;
423 }
424 attrs[i + tz->num_trips] = &trip_attrs->temp.attr.attr;
425
426 scnprintf(trip_attrs->hyst.name, sizeof(trip_attrs->hyst.name),
427 "trip_point_%d_hyst", i);
428
429 sysfs_attr_init(&trip_attrs->hyst.attr.attr);
430 trip_attrs->hyst.attr.attr.name = trip_attrs->hyst.name;
431 trip_attrs->hyst.attr.attr.mode = S_IRUGO;
432 trip_attrs->hyst.attr.show = trip_point_hyst_show;
433 if (td->trip.flags & THERMAL_TRIP_FLAG_RW_HYST) {
434 trip_attrs->hyst.attr.attr.mode |= S_IWUSR;
435 trip_attrs->hyst.attr.store = trip_point_hyst_store;
436 }
437 attrs[i + 2 * tz->num_trips] = &trip_attrs->hyst.attr.attr;
438 i++;
439 }
440 attrs[tz->num_trips * 3] = NULL;
441
442 tz->trips_attribute_group.attrs = attrs;
443
444 return 0;
445}
446
447/**
448 * destroy_trip_attrs() - destroy attributes for trip points
449 * @tz: the thermal zone device
450 *
451 * helper function to free resources allocated by create_trip_attrs()
452 */
453static void destroy_trip_attrs(struct thermal_zone_device *tz)
454{
455 if (tz)
456 kfree(tz->trips_attribute_group.attrs);
457}
458
459int thermal_zone_create_device_groups(struct thermal_zone_device *tz)
460{
461 const struct attribute_group **groups;
462 int i, size, result;
463
464 /* we need one extra for trips and the NULL to terminate the array */
465 size = ARRAY_SIZE(thermal_zone_attribute_groups) + 2;
466 /* This also takes care of API requirement to be NULL terminated */
467 groups = kzalloc_objs(*groups, size);
468 if (!groups)
469 return -ENOMEM;
470
471 for (i = 0; i < size - 2; i++)
472 groups[i] = thermal_zone_attribute_groups[i];
473
474 if (tz->num_trips) {
475 result = create_trip_attrs(tz);
476 if (result) {
477 kfree(groups);
478
479 return result;
480 }
481
482 groups[size - 2] = &tz->trips_attribute_group;
483 }
484
485 tz->device.groups = groups;
486
487 return 0;
488}
489
490void thermal_zone_destroy_device_groups(struct thermal_zone_device *tz)
491{
492 if (!tz)
493 return;
494
495 if (tz->num_trips)
496 destroy_trip_attrs(tz);
497
498 kfree(tz->device.groups);
499}
500
501/* sys I/F for cooling device */
502static ssize_t
503cdev_type_show(struct device *dev, struct device_attribute *attr, char *buf)
504{
505 struct thermal_cooling_device *cdev = to_cooling_device(dev);
506
507 return sysfs_emit(buf, "%s\n", cdev->type);
508}
509
510static ssize_t max_state_show(struct device *dev, struct device_attribute *attr,
511 char *buf)
512{
513 struct thermal_cooling_device *cdev = to_cooling_device(dev);
514
515 return sysfs_emit(buf, "%ld\n", cdev->max_state);
516}
517
518static ssize_t cur_state_show(struct device *dev, struct device_attribute *attr,
519 char *buf)
520{
521 struct thermal_cooling_device *cdev = to_cooling_device(dev);
522 unsigned long state;
523 int ret;
524
525 ret = cdev->ops->get_cur_state(cdev, &state);
526 if (ret)
527 return ret;
528 return sysfs_emit(buf, "%ld\n", state);
529}
530
531static ssize_t
532cur_state_store(struct device *dev, struct device_attribute *attr,
533 const char *buf, size_t count)
534{
535 struct thermal_cooling_device *cdev = to_cooling_device(dev);
536 unsigned long state;
537 int result;
538
539 result = kstrtoul(buf, 10, &state);
540 if (result < 0)
541 return result;
542
543 /* Requested state should be less than max_state + 1 */
544 if (state > cdev->max_state)
545 return -EINVAL;
546
547 guard(cooling_dev)(cdev);
548
549 result = cdev->ops->set_cur_state(cdev, state);
550 if (result)
551 return result;
552
553 thermal_cooling_device_stats_update(cdev, state);
554
555 return count;
556}
557
558static struct device_attribute
559dev_attr_cdev_type = __ATTR(type, 0444, cdev_type_show, NULL);
560static DEVICE_ATTR_RO(max_state);
561static DEVICE_ATTR_RW(cur_state);
562
563static struct attribute *cooling_device_attrs[] = {
564 &dev_attr_cdev_type.attr,
565 &dev_attr_max_state.attr,
566 &dev_attr_cur_state.attr,
567 NULL,
568};
569
570static const struct attribute_group cooling_device_attr_group = {
571 .attrs = cooling_device_attrs,
572};
573
574static const struct attribute_group *cooling_device_attr_groups[] = {
575 &cooling_device_attr_group,
576 NULL, /* Space allocated for cooling_device_stats_attr_group */
577 NULL,
578};
579
580#ifdef CONFIG_THERMAL_STATISTICS
581struct cooling_dev_stats {
582 spinlock_t lock;
583 unsigned int total_trans;
584 unsigned long state;
585 ktime_t last_time;
586 ktime_t *time_in_state;
587 unsigned int *trans_table;
588};
589
590static void update_time_in_state(struct cooling_dev_stats *stats)
591{
592 ktime_t now = ktime_get(), delta;
593
594 delta = ktime_sub(now, stats->last_time);
595 stats->time_in_state[stats->state] =
596 ktime_add(stats->time_in_state[stats->state], delta);
597 stats->last_time = now;
598}
599
600void thermal_cooling_device_stats_update(struct thermal_cooling_device *cdev,
601 unsigned long new_state)
602{
603 struct cooling_dev_stats *stats = cdev->stats;
604
605 lockdep_assert_held(&cdev->lock);
606
607 if (!stats)
608 return;
609
610 spin_lock(&stats->lock);
611
612 if (stats->state == new_state)
613 goto unlock;
614
615 update_time_in_state(stats);
616 stats->trans_table[stats->state * (cdev->max_state + 1) + new_state]++;
617 stats->state = new_state;
618 stats->total_trans++;
619
620unlock:
621 spin_unlock(&stats->lock);
622}
623
624static ssize_t total_trans_show(struct device *dev,
625 struct device_attribute *attr, char *buf)
626{
627 struct thermal_cooling_device *cdev = to_cooling_device(dev);
628 struct cooling_dev_stats *stats;
629 int ret;
630
631 guard(cooling_dev)(cdev);
632
633 stats = cdev->stats;
634 if (!stats)
635 return 0;
636
637 spin_lock(&stats->lock);
638 ret = sysfs_emit(buf, "%u\n", stats->total_trans);
639 spin_unlock(&stats->lock);
640
641 return ret;
642}
643
644static ssize_t
645time_in_state_ms_show(struct device *dev, struct device_attribute *attr,
646 char *buf)
647{
648 struct thermal_cooling_device *cdev = to_cooling_device(dev);
649 struct cooling_dev_stats *stats;
650 ssize_t len = 0;
651 int i;
652
653 guard(cooling_dev)(cdev);
654
655 stats = cdev->stats;
656 if (!stats)
657 return 0;
658
659 spin_lock(&stats->lock);
660
661 update_time_in_state(stats);
662
663 for (i = 0; i <= cdev->max_state; i++) {
664 len += sysfs_emit_at(buf, len, "state%u\t%llu\n", i,
665 ktime_to_ms(stats->time_in_state[i]));
666 }
667 spin_unlock(&stats->lock);
668
669 return len;
670}
671
672static ssize_t
673reset_store(struct device *dev, struct device_attribute *attr, const char *buf,
674 size_t count)
675{
676 struct thermal_cooling_device *cdev = to_cooling_device(dev);
677 struct cooling_dev_stats *stats;
678 int i, states;
679
680 guard(cooling_dev)(cdev);
681
682 stats = cdev->stats;
683 if (!stats)
684 return count;
685
686 states = cdev->max_state + 1;
687
688 spin_lock(&stats->lock);
689
690 stats->total_trans = 0;
691 stats->last_time = ktime_get();
692 memset(stats->trans_table, 0,
693 states * states * sizeof(*stats->trans_table));
694
695 for (i = 0; i < states; i++)
696 stats->time_in_state[i] = ktime_set(0, 0);
697
698 spin_unlock(&stats->lock);
699
700 return count;
701}
702
703static ssize_t trans_table_show(struct device *dev,
704 struct device_attribute *attr, char *buf)
705{
706 struct thermal_cooling_device *cdev = to_cooling_device(dev);
707 struct cooling_dev_stats *stats;
708 ssize_t len = 0;
709 int i, j, copied;
710
711 guard(cooling_dev)(cdev);
712
713 stats = cdev->stats;
714 if (!stats)
715 return -ENODATA;
716
717 len += sysfs_emit_at(buf, len, " From : To\n");
718 len += sysfs_emit_at(buf, len, " : ");
719 for (i = 0; i <= cdev->max_state; i++) {
720 copied = sysfs_emit_at(buf, len, "state%2u ", i);
721 if (!copied)
722 goto buf_full;
723 len += copied;
724 }
725 len += sysfs_emit_at(buf, len, "\n");
726
727 for (i = 0; i <= cdev->max_state; i++) {
728 copied = sysfs_emit_at(buf, len, "state%2u:", i);
729 if (!copied)
730 goto buf_full;
731 len += copied;
732
733 for (j = 0; j <= cdev->max_state; j++) {
734 copied = sysfs_emit_at(buf, len, "%8u ",
735 stats->trans_table[i * (cdev->max_state + 1) + j]);
736 if (!copied)
737 goto buf_full;
738 len += copied;
739 }
740 copied = sysfs_emit_at(buf, len, "\n");
741 if (!copied)
742 goto buf_full;
743 len += copied;
744 }
745
746 return len;
747
748buf_full:
749 pr_warn_once("Thermal transition table exceeds PAGE_SIZE. Disabling\n");
750 return -EFBIG;
751}
752
753static DEVICE_ATTR_RO(total_trans);
754static DEVICE_ATTR_RO(time_in_state_ms);
755static DEVICE_ATTR_WO(reset);
756static DEVICE_ATTR_RO(trans_table);
757
758static struct attribute *cooling_device_stats_attrs[] = {
759 &dev_attr_total_trans.attr,
760 &dev_attr_time_in_state_ms.attr,
761 &dev_attr_reset.attr,
762 &dev_attr_trans_table.attr,
763 NULL
764};
765
766static const struct attribute_group cooling_device_stats_attr_group = {
767 .attrs = cooling_device_stats_attrs,
768 .name = "stats"
769};
770
771static void cooling_device_stats_setup(struct thermal_cooling_device *cdev)
772{
773 const struct attribute_group *stats_attr_group = NULL;
774 struct cooling_dev_stats *stats;
775 /* Total number of states is highest state + 1 */
776 unsigned long states = cdev->max_state + 1;
777 int var;
778
779 var = sizeof(*stats);
780 var += sizeof(*stats->time_in_state) * states;
781 var += sizeof(*stats->trans_table) * states * states;
782
783 stats = kzalloc(var, GFP_KERNEL);
784 if (!stats)
785 goto out;
786
787 stats->time_in_state = (ktime_t *)(stats + 1);
788 stats->trans_table = (unsigned int *)(stats->time_in_state + states);
789 cdev->stats = stats;
790 stats->last_time = ktime_get();
791
792 spin_lock_init(&stats->lock);
793
794 stats_attr_group = &cooling_device_stats_attr_group;
795
796out:
797 /* Fill the empty slot left in cooling_device_attr_groups */
798 var = ARRAY_SIZE(cooling_device_attr_groups) - 2;
799 cooling_device_attr_groups[var] = stats_attr_group;
800}
801
802static void cooling_device_stats_destroy(struct thermal_cooling_device *cdev)
803{
804 kfree(cdev->stats);
805 cdev->stats = NULL;
806}
807
808#else
809
810static inline void
811cooling_device_stats_setup(struct thermal_cooling_device *cdev) {}
812static inline void
813cooling_device_stats_destroy(struct thermal_cooling_device *cdev) {}
814
815#endif /* CONFIG_THERMAL_STATISTICS */
816
817void thermal_cooling_device_setup_sysfs(struct thermal_cooling_device *cdev)
818{
819 cooling_device_stats_setup(cdev);
820 cdev->device.groups = cooling_device_attr_groups;
821}
822
823void thermal_cooling_device_destroy_sysfs(struct thermal_cooling_device *cdev)
824{
825 cooling_device_stats_destroy(cdev);
826}
827
828void thermal_cooling_device_stats_reinit(struct thermal_cooling_device *cdev)
829{
830 lockdep_assert_held(&cdev->lock);
831
832 cooling_device_stats_destroy(cdev);
833 cooling_device_stats_setup(cdev);
834}
835
836/* these helper will be used only at the time of bindig */
837ssize_t
838trip_point_show(struct device *dev, struct device_attribute *attr, char *buf)
839{
840 struct thermal_zone_device *tz = to_thermal_zone(dev);
841 struct thermal_instance *instance;
842
843 instance = container_of(attr, struct thermal_instance, attr);
844
845 return sysfs_emit(buf, "%d\n", thermal_zone_trip_id(tz, instance->trip));
846}
847
848ssize_t
849weight_show(struct device *dev, struct device_attribute *attr, char *buf)
850{
851 struct thermal_instance *instance;
852
853 instance = container_of(attr, struct thermal_instance, weight_attr);
854
855 return sysfs_emit(buf, "%d\n", instance->weight);
856}
857
858ssize_t weight_store(struct device *dev, struct device_attribute *attr,
859 const char *buf, size_t count)
860{
861 struct thermal_zone_device *tz = to_thermal_zone(dev);
862 struct thermal_instance *instance;
863 int ret, weight;
864
865 ret = kstrtoint(buf, 0, &weight);
866 if (ret)
867 return ret;
868
869 instance = container_of(attr, struct thermal_instance, weight_attr);
870
871 /* Don't race with governors using the 'weight' value */
872 guard(thermal_zone)(tz);
873
874 instance->weight = weight;
875
876 thermal_governor_update_tz(tz, THERMAL_INSTANCE_WEIGHT_CHANGED);
877
878 return count;
879}