summaryrefslogtreecommitdiffstats
path: root/drivers/thermal/x86_pkg_temp_thermal.c
blob: 97f0a2bd93edfb64bc326adf29724bf456548ad8 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
/*
 * x86_pkg_temp_thermal driver
 * Copyright (c) 2013, Intel Corporation.
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms and conditions of the GNU General Public License,
 * version 2, as published by the Free Software Foundation.
 *
 * This program is distributed in the hope it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
 * more details.
 *
 * You should have received a copy of the GNU General Public License along with
 * this program; if not, write to the Free Software Foundation, Inc.
 *
 */
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

#include <linux/module.h>
#include <linux/init.h>
#include <linux/err.h>
#include <linux/param.h>
#include <linux/device.h>
#include <linux/platform_device.h>
#include <linux/cpu.h>
#include <linux/smp.h>
#include <linux/slab.h>
#include <linux/pm.h>
#include <linux/thermal.h>
#include <linux/debugfs.h>
#include <asm/cpu_device_id.h>
#include <asm/mce.h>

/*
* Rate control delay: Idea is to introduce denounce effect
* This should be long enough to avoid reduce events, when
* threshold is set to a temperature, which is constantly
* violated, but at the short enough to take any action.
* The action can be remove threshold or change it to next
* interesting setting. Based on experiments, in around
* every 5 seconds under load will give us a significant
* temperature change.
*/
#define PKG_TEMP_THERMAL_NOTIFY_DELAY	5000
static int notify_delay_ms = PKG_TEMP_THERMAL_NOTIFY_DELAY;
module_param(notify_delay_ms, int, 0644);
MODULE_PARM_DESC(notify_delay_ms,
	"User space notification delay in milli seconds.");

/* Number of trip points in thermal zone. Currently it can't
* be more than 2. MSR can allow setting and getting notifications
* for only 2 thresholds. This define enforces this, if there
* is some wrong values returned by cpuid for number of thresholds.
*/
#define MAX_NUMBER_OF_TRIPS	2
/* Limit number of package temp zones */
#define MAX_PKG_TEMP_ZONE_IDS	256

struct phy_dev_entry {
	struct list_head list;
	u16 phys_proc_id;
	u16 first_cpu;
	u32 tj_max;
	int ref_cnt;
	u32 start_pkg_therm_low;
	u32 start_pkg_therm_high;
	struct thermal_zone_device *tzone;
};

static struct thermal_zone_params pkg_temp_tz_params = {
	.no_hwmon	= true,
};

/* List maintaining number of package instances */
static LIST_HEAD(phy_dev_list);
static DEFINE_MUTEX(phy_dev_list_mutex);

/* Interrupt to work function schedule queue */
static DEFINE_PER_CPU(struct delayed_work, pkg_temp_thermal_threshold_work);

/* To track if the work is already scheduled on a package */
static u8 *pkg_work_scheduled;

/* Spin lock to prevent races with pkg_work_scheduled */
static spinlock_t pkg_work_lock;
static u16 max_phy_id;

/* Debug counters to show using debugfs */
static struct dentry *debugfs;
static unsigned int pkg_interrupt_cnt;
static unsigned int pkg_work_cnt;

static int pkg_temp_debugfs_init(void)
{
	struct dentry *d;

	debugfs = debugfs_create_dir("pkg_temp_thermal", NULL);
	if (!debugfs)
		return -ENOENT;

	d = debugfs_create_u32("pkg_thres_interrupt", S_IRUGO, debugfs,
				(u32 *)&pkg_interrupt_cnt);
	if (!d)
		goto err_out;

	d = debugfs_create_u32("pkg_thres_work", S_IRUGO, debugfs,
				(u32 *)&pkg_work_cnt);
	if (!d)
		goto err_out;

	return 0;

err_out:
	debugfs_remove_recursive(debugfs);
	return -ENOENT;
}

static struct phy_dev_entry
			*pkg_temp_thermal_get_phy_entry(unsigned int cpu)
{
	u16 phys_proc_id = topology_physical_package_id(cpu);
	struct phy_dev_entry *phy_ptr;

	mutex_lock(&phy_dev_list_mutex);

	list_for_each_entry(phy_ptr, &phy_dev_list, list)
		if (phy_ptr->phys_proc_id == phys_proc_id) {
			mutex_unlock(&phy_dev_list_mutex);
			return phy_ptr;
		}

	mutex_unlock(&phy_dev_list_mutex);

	return NULL;
}

/*
* tj-max is is interesting because threshold is set relative to this
* temperature.
*/
static int get_tj_max(int cpu, u32 *tj_max)
{
	u32 eax, edx;
	u32 val;
	int err;

	err = rdmsr_safe_on_cpu(cpu, MSR_IA32_TEMPERATURE_TARGET, &eax, &edx);
	if (err)
		goto err_ret;
	else {
		val = (eax >> 16) & 0xff;
		if (val)
			*tj_max = val * 1000;
		else {
			err = -EINVAL;
			goto err_ret;
		}
	}

	return 0;
err_ret:
	*tj_max = 0;
	return err;
}

static int sys_get_curr_temp(struct thermal_zone_device *tzd, int *temp)
{
	u32 eax, edx;
	struct phy_dev_entry *phy_dev_entry;

	phy_dev_entry = tzd->devdata;
	rdmsr_on_cpu(phy_dev_entry->first_cpu, MSR_IA32_PACKAGE_THERM_STATUS,
			&eax, &edx);
	if (eax & 0x80000000) {
		*temp = phy_dev_entry->tj_max -
				((eax >> 16) & 0x7f) * 1000;
		pr_debug("sys_get_curr_temp %d\n", *temp);
		return 0;
	}

	return -EINVAL;
}

static int sys_get_trip_temp(struct thermal_zone_device *tzd,
		int trip, int *temp)
{
	u32 eax, edx;
	struct phy_dev_entry *phy_dev_entry;
	u32 mask, shift;
	unsigned long thres_reg_value;
	int ret;

	if (trip >= MAX_NUMBER_OF_TRIPS)
		return -EINVAL;

	phy_dev_entry = tzd->devdata;

	if (trip) {
		mask = THERM_MASK_THRESHOLD1;
		shift = THERM_SHIFT_THRESHOLD1;
	} else {
		mask = THERM_MASK_THRESHOLD0;
		shift = THERM_SHIFT_THRESHOLD0;
	}

	ret = rdmsr_on_cpu(phy_dev_entry->first_cpu,
				MSR_IA32_PACKAGE_THERM_INTERRUPT, &eax, &edx);
	if (ret < 0)
		return -EINVAL;

	thres_reg_value = (eax & mask) >> shift;
	if (thres_reg_value)
		*temp = phy_dev_entry->tj_max - thres_reg_value * 1000;
	else
		*temp = 0;
	pr_debug("sys_get_trip_temp %d\n", *temp);

	return 0;
}

static int sys_set_trip_temp(struct thermal_zone_device *tzd, int trip,
							int temp)
{
	u32 l, h;
	struct phy_dev_entry *phy_dev_entry;
	u32 mask, shift, intr;
	int ret;

	phy_dev_entry = tzd->devdata;

	if (trip >= MAX_NUMBER_OF_TRIPS || temp >= phy_dev_entry->tj_max)
		return -EINVAL;

	ret = rdmsr_on_cpu(phy_dev_entry->first_cpu,
					MSR_IA32_PACKAGE_THERM_INTERRUPT,
					&l, &h);
	if (ret < 0)
		return -EINVAL;

	if (trip) {
		mask = THERM_MASK_THRESHOLD1;
		shift = THERM_SHIFT_THRESHOLD1;
		intr = THERM_INT_THRESHOLD1_ENABLE;
	} else {
		mask = THERM_MASK_THRESHOLD0;
		shift = THERM_SHIFT_THRESHOLD0;
		intr = THERM_INT_THRESHOLD0_ENABLE;
	}
	l &= ~mask;
	/*
	* When users space sets a trip temperature == 0, which is indication
	* that, it is no longer interested in receiving notifications.
	*/
	if (!temp)
		l &= ~intr;
	else {
		l |= (phy_dev_entry->tj_max - temp)/1000 << shift;
		l |= intr;
	}

	return wrmsr_on_cpu(phy_dev_entry->first_cpu,
					MSR_IA32_PACKAGE_THERM_INTERRUPT,
					l, h);
}

static int sys_get_trip_type(struct thermal_zone_device *thermal,
		int trip, enum thermal_trip_type *type)
{

	*type = THERMAL_TRIP_PASSIVE;

	return 0;
}

/* Thermal zone callback registry */
static struct thermal_zone_device_ops tzone_ops = {
	.get_temp = sys_get_curr_temp,
	.get_trip_temp = sys_get_trip_temp,
	.get_trip_type = sys_get_trip_type,
	.set_trip_temp = sys_set_trip_temp,
};

static bool pkg_temp_thermal_platform_thermal_rate_control(void)
{
	return true;
}

/* Enable threshold interrupt on local package/cpu */
static inline void enable_pkg_thres_interrupt(void)
{
	u32 l, h;
	u8 thres_0, thres_1;

	rdmsr(MSR_IA32_PACKAGE_THERM_INTERRUPT, l, h);
	/* only enable/disable if it had valid threshold value */
	thres_0 = (l & THERM_MASK_THRESHOLD0) >> THERM_SHIFT_THRESHOLD0;
	thres_1 = (l & THERM_MASK_THRESHOLD1) >> THERM_SHIFT_THRESHOLD1;
	if (thres_0)
		l |= THERM_INT_THRESHOLD0_ENABLE;
	if (thres_1)
		l |= THERM_INT_THRESHOLD1_ENABLE;
	wrmsr(MSR_IA32_PACKAGE_THERM_INTERRUPT, l, h);
}

/* Disable threshold interrupt on local package/cpu */
static inline void disable_pkg_thres_interrupt(void)
{
	u32 l, h;
	rdmsr(MSR_IA32_PACKAGE_THERM_INTERRUPT, l, h);
	wrmsr(MSR_IA32_PACKAGE_THERM_INTERRUPT,
			l & (~THERM_INT_THRESHOLD0_ENABLE) &
				(~THERM_INT_THRESHOLD1_ENABLE), h);
}

static void pkg_temp_thermal_threshold_work_fn(struct work_struct *work)
{
	__u64 msr_val;
	int cpu = smp_processor_id();
	int phy_id = topology_physical_package_id(cpu);
	struct phy_dev_entry *phdev = pkg_temp_thermal_get_phy_entry(cpu);
	bool notify = false;
	unsigned long flags;

	if (!phdev)
		return;

	spin_lock_irqsave(&pkg_work_lock, flags);
	++pkg_work_cnt;
	if (unlikely(phy_id > max_phy_id)) {
		spin_unlock_irqrestore(&pkg_work_lock, flags);
		return;
	}
	pkg_work_scheduled[phy_id] = 0;
	spin_unlock_irqrestore(&pkg_work_lock, flags);

	enable_pkg_thres_interrupt();
	rdmsrl(MSR_IA32_PACKAGE_THERM_STATUS, msr_val);
	if (msr_val & THERM_LOG_THRESHOLD0) {
		wrmsrl(MSR_IA32_PACKAGE_THERM_STATUS,
				msr_val & ~THERM_LOG_THRESHOLD0);
		notify = true;
	}
	if (msr_val & THERM_LOG_THRESHOLD1) {
		wrmsrl(MSR_IA32_PACKAGE_THERM_STATUS,
				msr_val & ~THERM_LOG_THRESHOLD1);
		notify = true;
	}
	if (notify) {
		pr_debug("thermal_zone_device_update\n");
		thermal_zone_device_update(phdev->tzone);
	}
}

static int pkg_temp_thermal_platform_thermal_notify(__u64 msr_val)
{
	unsigned long flags;
	int cpu = smp_processor_id();
	int phy_id = topology_physical_package_id(cpu);

	/*
	* When a package is in interrupted state, all CPU's in that package
	* are in the same interrupt state. So scheduling on any one CPU in
	* the package is enough and simply return for others.
	*/
	spin_lock_irqsave(&pkg_work_lock, flags);
	++pkg_interrupt_cnt;
	if (unlikely(phy_id > max_phy_id) || unlikely(!pkg_work_scheduled) ||
			pkg_work_scheduled[phy_id]) {
		disable_pkg_thres_interrupt();
		spin_unlock_irqrestore(&pkg_work_lock, flags);
		return -EINVAL;
	}
	pkg_work_scheduled[phy_id] = 1;
	spin_unlock_irqrestore(&pkg_work_lock, flags);

	disable_pkg_thres_interrupt();
	schedule_delayed_work_on(cpu,
				&per_cpu(pkg_temp_thermal_threshold_work, cpu),
				msecs_to_jiffies(notify_delay_ms));
	return 0;
}

static int find_siblings_cpu(int cpu)
{
	int i;
	int id = topology_physical_package_id(cpu);

	for_each_online_cpu(i)
		if (i != cpu && topology_physical_package_id(i) == id)
			return i;

	return 0;
}

static int pkg_temp_thermal_device_add(unsigned int cpu)
{
	int err;
	u32 tj_max;
	struct phy_dev_entry *phy_dev_entry;
	int thres_count;
	u32 eax, ebx, ecx, edx;
	u8 *temp;
	unsigned long flags;

	cpuid(6, &eax, &ebx, &ecx, &edx);
	thres_count = ebx & 0x07;
	if (!thres_count)
		return -ENODEV;

	if (topology_physical_package_id(cpu) > MAX_PKG_TEMP_ZONE_IDS)
		return -ENODEV;

	thres_count = clamp_val(thres_count, 0, MAX_NUMBER_OF_TRIPS);

	err = get_tj_max(cpu, &tj_max);
	if (err)
		goto err_ret;

	mutex_lock(&phy_dev_list_mutex);

	phy_dev_entry = kzalloc(sizeof(*phy_dev_entry), GFP_KERNEL);
	if (!phy_dev_entry) {
		err = -ENOMEM;
		goto err_ret_unlock;
	}

	spin_lock_irqsave(&pkg_work_lock, flags);
	if (topology_physical_package_id(cpu) > max_phy_id)
		max_phy_id = topology_physical_package_id(cpu);
	temp = krealloc(pkg_work_scheduled,
			(max_phy_id+1) * sizeof(u8), GFP_ATOMIC);
	if (!temp) {
		spin_unlock_irqrestore(&pkg_work_lock, flags);
		err = -ENOMEM;
		goto err_ret_free;
	}
	pkg_work_scheduled = temp;
	pkg_work_scheduled[topology_physical_package_id(cpu)] = 0;
	spin_unlock_irqrestore(&pkg_work_lock, flags);

	phy_dev_entry->phys_proc_id = topology_physical_package_id(cpu);
	phy_dev_entry->first_cpu = cpu;
	phy_dev_entry->tj_max = tj_max;
	phy_dev_entry->ref_cnt = 1;
	phy_dev_entry->tzone = thermal_zone_device_register("x86_pkg_temp",
			thres_count,
			(thres_count == MAX_NUMBER_OF_TRIPS) ?
				0x03 : 0x01,
			phy_dev_entry, &tzone_ops, &pkg_temp_tz_params, 0, 0);
	if (IS_ERR(phy_dev_entry->tzone)) {
		err = PTR_ERR(phy_dev_entry->tzone);
		goto err_ret_free;
	}
	/* Store MSR value for package thermal interrupt, to restore at exit */
	rdmsr_on_cpu(cpu, MSR_IA32_PACKAGE_THERM_INTERRUPT,
				&phy_dev_entry->start_pkg_therm_low,
				&phy_dev_entry->start_pkg_therm_high);

	list_add_tail(&phy_dev_entry->list, &phy_dev_list);
	pr_debug("pkg_temp_thermal_device_add :phy_id %d cpu %d\n",
			phy_dev_entry->phys_proc_id, cpu);

	mutex_unlock(&phy_dev_list_mutex);

	return 0;

err_ret_free:
	kfree(phy_dev_entry);
err_ret_unlock:
	mutex_unlock(&phy_dev_list_mutex);

err_ret:
	return err;
}

static int pkg_temp_thermal_device_remove(unsigned int cpu)
{
	struct phy_dev_entry *n;
	u16 phys_proc_id = topology_physical_package_id(cpu);
	struct phy_dev_entry *phdev =
			pkg_temp_thermal_get_phy_entry(cpu);

	if (!phdev)
		return -ENODEV;

	mutex_lock(&phy_dev_list_mutex);
	/* If we are loosing the first cpu for this package, we need change */
	if (phdev->first_cpu == cpu) {
		phdev->first_cpu = find_siblings_cpu(cpu);
		pr_debug("thermal_device_remove: first cpu switched %d\n",
					phdev->first_cpu);
	}
	/*
	* It is possible that no siblings left as this was the last cpu
	* going offline. We don't need to worry about this assignment
	* as the phydev entry will be removed in this case and
	* thermal zone is removed.
	*/
	--phdev->ref_cnt;
	pr_debug("thermal_device_remove: pkg: %d cpu %d ref_cnt %d\n",
					phys_proc_id, cpu, phdev->ref_cnt);
	if (!phdev->ref_cnt)
		list_for_each_entry_safe(phdev, n, &phy_dev_list, list) {
			if (phdev->phys_proc_id == phys_proc_id) {
				thermal_zone_device_unregister(phdev->tzone);
				list_del(&phdev->list);
				kfree(phdev);
				break;
			}
		}
	mutex_unlock(&phy_dev_list_mutex);

	return 0;
}

static int get_core_online(unsigned int cpu)
{
	struct cpuinfo_x86 *c = &cpu_data(cpu);
	struct phy_dev_entry *phdev = pkg_temp_thermal_get_phy_entry(cpu);

	/* Check if there is already an instance for this package */
	if (!phdev) {
		if (!cpu_has(c, X86_FEATURE_DTHERM) ||
					!cpu_has(c, X86_FEATURE_PTS))
			return -ENODEV;
		if (pkg_temp_thermal_device_add(cpu))
			return -ENODEV;
	} else {
		mutex_lock(&phy_dev_list_mutex);
		++phdev->ref_cnt;
		pr_debug("get_core_online: cpu %d ref_cnt %d\n",
						cpu, phdev->ref_cnt);
		mutex_unlock(&phy_dev_list_mutex);
	}
	INIT_DELAYED_WORK(&per_cpu(pkg_temp_thermal_threshold_work, cpu),
			pkg_temp_thermal_threshold_work_fn);

	pr_debug("get_core_online: cpu %d successful\n", cpu);

	return 0;
}

static void put_core_offline(unsigned int cpu)
{
	if (!pkg_temp_thermal_device_remove(cpu))
		cancel_delayed_work_sync(
			&per_cpu(pkg_temp_thermal_threshold_work, cpu));

	pr_debug("put_core_offline: cpu %d\n", cpu);
}

static int pkg_temp_thermal_cpu_callback(struct notifier_block *nfb,
				 unsigned long action, void *hcpu)
{
	unsigned int cpu = (unsigned long) hcpu;

	switch (action & ~CPU_TASKS_FROZEN) {
	case CPU_ONLINE:
	case CPU_DOWN_FAILED:
		get_core_online(cpu);
		break;
	case CPU_DOWN_PREPARE:
		put_core_offline(cpu);
		break;
	}
	return NOTIFY_OK;
}

static struct notifier_block pkg_temp_thermal_notifier __refdata = {
	.notifier_call = pkg_temp_thermal_cpu_callback,
};

static const struct x86_cpu_id __initconst pkg_temp_thermal_ids[] = {
	{ X86_VENDOR_INTEL, X86_FAMILY_ANY, X86_MODEL_ANY, X86_FEATURE_PTS },
	{}
};
MODULE_DEVICE_TABLE(x86cpu, pkg_temp_thermal_ids);

static int __init pkg_temp_thermal_init(void)
{
	int i;

	if (!x86_match_cpu(pkg_temp_thermal_ids))
		return -ENODEV;

	spin_lock_init(&pkg_work_lock);
	platform_thermal_package_notify =
			pkg_temp_thermal_platform_thermal_notify;
	platform_thermal_package_rate_control =
			pkg_temp_thermal_platform_thermal_rate_control;

	cpu_notifier_register_begin();
	for_each_online_cpu(i)
		if (get_core_online(i))
			goto err_ret;
	__register_hotcpu_notifier(&pkg_temp_thermal_notifier);
	cpu_notifier_register_done();

	pkg_temp_debugfs_init(); /* Don't care if fails */

	return 0;

err_ret:
	for_each_online_cpu(i)
		put_core_offline(i);
	cpu_notifier_register_done();
	kfree(pkg_work_scheduled);
	platform_thermal_package_notify = NULL;
	platform_thermal_package_rate_control = NULL;

	return -ENODEV;
}

static void __exit pkg_temp_thermal_exit(void)
{
	struct phy_dev_entry *phdev, *n;
	int i;

	cpu_notifier_register_begin();
	__unregister_hotcpu_notifier(&pkg_temp_thermal_notifier);
	mutex_lock(&phy_dev_list_mutex);
	list_for_each_entry_safe(phdev, n, &phy_dev_list, list) {
		/* Retore old MSR value for package thermal interrupt */
		wrmsr_on_cpu(phdev->first_cpu,
			MSR_IA32_PACKAGE_THERM_INTERRUPT,
			phdev->start_pkg_therm_low,
			phdev->start_pkg_therm_high);
		thermal_zone_device_unregister(phdev->tzone);
		list_del(&phdev->list);
		kfree(phdev);
	}
	mutex_unlock(&phy_dev_list_mutex);
	platform_thermal_package_notify = NULL;
	platform_thermal_package_rate_control = NULL;
	for_each_online_cpu(i)
		cancel_delayed_work_sync(
			&per_cpu(pkg_temp_thermal_threshold_work, i));
	cpu_notifier_register_done();

	kfree(pkg_work_scheduled);

	debugfs_remove_recursive(debugfs);
}

module_init(pkg_temp_thermal_init)
module_exit(pkg_temp_thermal_exit)

MODULE_DESCRIPTION("X86 PKG TEMP Thermal Driver");
MODULE_AUTHOR("Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>");
MODULE_LICENSE("GPL v2");
OpenPOWER on IntegriCloud