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2024-01-05 071106ecf68c401173c58808b1cf5f68cc50d390 
 kernel/drivers/cpufreq/cpufreq.c
....@@ -1,3 +1,4 @@
1
+// SPDX-License-Identifier: GPL-2.0-only
12 /*
23  *  linux/drivers/cpufreq/cpufreq.c
34  *
....@@ -9,10 +10,6 @@
910  *	Added handling for CPU hotplug
1011  *  Feb 2006 - Jacob Shin <jacob.shin@amd.com>
1112  *	Fix handling for CPU hotplug -- affected CPUs
12
- *
13
- * This program is free software; you can redistribute it and/or modify
14
- * it under the terms of the GNU General Public License version 2 as
15
- * published by the Free Software Foundation.
1613  */
1714 
1815 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
....@@ -27,22 +24,15 @@
2724 #include <linux/kernel_stat.h>
2825 #include <linux/module.h>
2926 #include <linux/mutex.h>
27
+#include <linux/pm_qos.h>
3028 #include <linux/slab.h>
3129 #include <linux/suspend.h>
3230 #include <linux/syscore_ops.h>
3331 #include <linux/tick.h>
3432 #include <trace/events/power.h>
35
-
36
-#if IS_ENABLED(CONFIG_ARM_ROCKCHIP_CPUFREQ)
37
-#include "rockchip-cpufreq.h"
38
-#endif
33
+#include <trace/hooks/cpufreq.h>
3934 
4035 static LIST_HEAD(cpufreq_policy_list);
41
-
42
-static inline bool policy_is_inactive(struct cpufreq_policy *policy)
43
-{
44
-	return cpumask_empty(policy->cpus);
45
-}
4636 
4737 /* Macros to iterate over CPU policies */
4838 #define for_each_suitable_policy(__policy, __active)			 \
....@@ -62,7 +52,9 @@
6252 #define for_each_governor(__governor)				\
6353 	list_for_each_entry(__governor, &cpufreq_governor_list, governor_list)
6454 
65
-/**
55
+static char default_governor[CPUFREQ_NAME_LEN];
56
+
57
+/*
6658  * The "cpufreq driver" - the arch- or hardware-dependent low
6759  * level driver of CPUFreq support, and its spinlock. This lock
6860  * also protects the cpufreq_cpu_data array.
....@@ -70,6 +62,12 @@
7062 static struct cpufreq_driver *cpufreq_driver;
7163 static DEFINE_PER_CPU(struct cpufreq_policy *, cpufreq_cpu_data);
7264 static DEFINE_RWLOCK(cpufreq_driver_lock);
65
+
66
+static DEFINE_STATIC_KEY_FALSE(cpufreq_freq_invariance);
67
+bool cpufreq_supports_freq_invariance(void)
68
+{
69
+	return static_branch_likely(&cpufreq_freq_invariance);
70
+}
7371 
7472 /* Flag to suspend/resume CPUFreq governors */
7573 static bool cpufreq_suspended;
....@@ -83,11 +81,12 @@
8381 static unsigned int __cpufreq_get(struct cpufreq_policy *policy);
8482 static int cpufreq_init_governor(struct cpufreq_policy *policy);
8583 static void cpufreq_exit_governor(struct cpufreq_policy *policy);
86
-static int cpufreq_start_governor(struct cpufreq_policy *policy);
87
-static void cpufreq_stop_governor(struct cpufreq_policy *policy);
8884 static void cpufreq_governor_limits(struct cpufreq_policy *policy);
85
+static int cpufreq_set_policy(struct cpufreq_policy *policy,
86
+			      struct cpufreq_governor *new_gov,
87
+			      unsigned int new_pol);
8988 
90
-/**
89
+/*
9190  * Two notifier lists: the "policy" list is involved in the
9291  * validation process for a new CPU frequency policy; the
9392  * "transition" list for kernel code that needs to handle
....@@ -114,6 +113,8 @@
114113 }
115114 EXPORT_SYMBOL_GPL(have_governor_per_policy);
116115 
116
+static struct kobject *cpufreq_global_kobject;
117
+
117118 struct kobject *get_governor_parent_kobj(struct cpufreq_policy *policy)
118119 {
119120 	if (have_governor_per_policy())
....@@ -125,18 +126,21 @@
125126 
126127 static inline u64 get_cpu_idle_time_jiffy(unsigned int cpu, u64 *wall)
127128 {
128
-	u64 idle_time;
129
+	struct kernel_cpustat kcpustat;
129130 	u64 cur_wall_time;
131
+	u64 idle_time;
130132 	u64 busy_time;
131133 
132134 	cur_wall_time = jiffies64_to_nsecs(get_jiffies_64());
133135 
134
-	busy_time = kcpustat_cpu(cpu).cpustat[CPUTIME_USER];
135
-	busy_time += kcpustat_cpu(cpu).cpustat[CPUTIME_SYSTEM];
136
-	busy_time += kcpustat_cpu(cpu).cpustat[CPUTIME_IRQ];
137
-	busy_time += kcpustat_cpu(cpu).cpustat[CPUTIME_SOFTIRQ];
138
-	busy_time += kcpustat_cpu(cpu).cpustat[CPUTIME_STEAL];
139
-	busy_time += kcpustat_cpu(cpu).cpustat[CPUTIME_NICE];
136
+	kcpustat_cpu_fetch(&kcpustat, cpu);
137
+
138
+	busy_time = kcpustat.cpustat[CPUTIME_USER];
139
+	busy_time += kcpustat.cpustat[CPUTIME_SYSTEM];
140
+	busy_time += kcpustat.cpustat[CPUTIME_IRQ];
141
+	busy_time += kcpustat.cpustat[CPUTIME_SOFTIRQ];
142
+	busy_time += kcpustat.cpustat[CPUTIME_STEAL];
143
+	busy_time += kcpustat.cpustat[CPUTIME_NICE];
140144 
141145 	idle_time = cur_wall_time - busy_time;
142146 	if (wall)
....@@ -158,18 +162,6 @@
158162 }
159163 EXPORT_SYMBOL_GPL(get_cpu_idle_time);
160164 
161
-__weak void arch_set_freq_scale(struct cpumask *cpus, unsigned long cur_freq,
162
-		unsigned long max_freq)
163
-{
164
-}
165
-EXPORT_SYMBOL_GPL(arch_set_freq_scale);
166
-
167
-__weak void arch_set_max_freq_scale(struct cpumask *cpus,
168
-				    unsigned long policy_max_freq)
169
-{
170
-}
171
-EXPORT_SYMBOL_GPL(arch_set_max_freq_scale);
172
-
173165 /*
174166  * This is a generic cpufreq init() routine which can be used by cpufreq
175167  * drivers of SMP systems. It will do following:
....@@ -177,7 +169,7 @@
177169  * - set policies transition latency
178170  * - policy->cpus with all possible CPUs
179171  */
180
-int cpufreq_generic_init(struct cpufreq_policy *policy,
172
+void cpufreq_generic_init(struct cpufreq_policy *policy,
181173 		struct cpufreq_frequency_table *table,
182174 		unsigned int transition_latency)
183175 {
....@@ -189,8 +181,6 @@
189181 	 * share the clock and voltage and clock.
190182 	 */
191183 	cpumask_setall(policy->cpus);
192
-
193
-	return 0;
194184 }
195185 EXPORT_SYMBOL_GPL(cpufreq_generic_init);
196186 
....@@ -217,17 +207,15 @@
217207 EXPORT_SYMBOL_GPL(cpufreq_generic_get);
218208 
219209 /**
220
- * cpufreq_cpu_get: returns policy for a cpu and marks it busy.
210
+ * cpufreq_cpu_get - Return policy for a CPU and mark it as busy.
211
+ * @cpu: CPU to find the policy for.
221212  *
222
- * @cpu: cpu to find policy for.
213
+ * Call cpufreq_cpu_get_raw() to obtain a cpufreq policy for @cpu and increment
214
+ * the kobject reference counter of that policy.  Return a valid policy on
215
+ * success or NULL on failure.
223216  *
224
- * This returns policy for 'cpu', returns NULL if it doesn't exist.
225
- * It also increments the kobject reference count to mark it busy and so would
226
- * require a corresponding call to cpufreq_cpu_put() to decrement it back.
227
- * If corresponding call cpufreq_cpu_put() isn't made, the policy wouldn't be
228
- * freed as that depends on the kobj count.
229
- *
230
- * Return: A valid policy on success, otherwise NULL on failure.
217
+ * The policy returned by this function has to be released with the help of
218
+ * cpufreq_cpu_put() to balance its kobject reference counter properly.
231219  */
232220 struct cpufreq_policy *cpufreq_cpu_get(unsigned int cpu)
233221 {
....@@ -254,12 +242,8 @@
254242 EXPORT_SYMBOL_GPL(cpufreq_cpu_get);
255243 
256244 /**
257
- * cpufreq_cpu_put: Decrements the usage count of a policy
258
- *
259
- * @policy: policy earlier returned by cpufreq_cpu_get().
260
- *
261
- * This decrements the kobject reference count incremented earlier by calling
262
- * cpufreq_cpu_get().
245
+ * cpufreq_cpu_put - Decrement kobject usage counter for cpufreq policy.
246
+ * @policy: cpufreq policy returned by cpufreq_cpu_get().
263247  */
264248 void cpufreq_cpu_put(struct cpufreq_policy *policy)
265249 {
....@@ -267,11 +251,56 @@
267251 }
268252 EXPORT_SYMBOL_GPL(cpufreq_cpu_put);
269253 
254
+/**
255
+ * cpufreq_cpu_release - Unlock a policy and decrement its usage counter.
256
+ * @policy: cpufreq policy returned by cpufreq_cpu_acquire().
257
+ */
258
+void cpufreq_cpu_release(struct cpufreq_policy *policy)
259
+{
260
+	if (WARN_ON(!policy))
261
+		return;
262
+
263
+	lockdep_assert_held(&policy->rwsem);
264
+
265
+	up_write(&policy->rwsem);
266
+
267
+	cpufreq_cpu_put(policy);
268
+}
269
+
270
+/**
271
+ * cpufreq_cpu_acquire - Find policy for a CPU, mark it as busy and lock it.
272
+ * @cpu: CPU to find the policy for.
273
+ *
274
+ * Call cpufreq_cpu_get() to get a reference on the cpufreq policy for @cpu and
275
+ * if the policy returned by it is not NULL, acquire its rwsem for writing.
276
+ * Return the policy if it is active or release it and return NULL otherwise.
277
+ *
278
+ * The policy returned by this function has to be released with the help of
279
+ * cpufreq_cpu_release() in order to release its rwsem and balance its usage
280
+ * counter properly.
281
+ */
282
+struct cpufreq_policy *cpufreq_cpu_acquire(unsigned int cpu)
283
+{
284
+	struct cpufreq_policy *policy = cpufreq_cpu_get(cpu);
285
+
286
+	if (!policy)
287
+		return NULL;
288
+
289
+	down_write(&policy->rwsem);
290
+
291
+	if (policy_is_inactive(policy)) {
292
+		cpufreq_cpu_release(policy);
293
+		return NULL;
294
+	}
295
+
296
+	return policy;
297
+}
298
+
270299 /*********************************************************************
271300  *            EXTERNALLY AFFECTING FREQUENCY CHANGES                 *
272301  *********************************************************************/
273302 
274
-/**
303
+/*
275304  * adjust_jiffies - adjust the system "loops_per_jiffy"
276305  *
277306  * This function alters the system "loops_per_jiffy" for the clock
....@@ -317,11 +346,14 @@
317346 				      struct cpufreq_freqs *freqs,
318347 				      unsigned int state)
319348 {
349
+	int cpu;
350
+
320351 	BUG_ON(irqs_disabled());
321352 
322353 	if (cpufreq_disabled())
323354 		return;
324355 
356
+	freqs->policy = policy;
325357 	freqs->flags = cpufreq_driver->flags;
326358 	pr_debug("notification %u of frequency transition to %u kHz\n",
327359 		 state, freqs->new);
....@@ -333,18 +365,14 @@
333365 		 * which is not equal to what the cpufreq core thinks is
334366 		 * "old frequency".
335367 		 */
336
-		if (!(cpufreq_driver->flags & CPUFREQ_CONST_LOOPS)) {
337
-			if (policy->cur && (policy->cur != freqs->old)) {
338
-				pr_debug("Warning: CPU frequency is %u, cpufreq assumed %u kHz\n",
339
-					 freqs->old, policy->cur);
340
-				freqs->old = policy->cur;
341
-			}
368
+		if (policy->cur && policy->cur != freqs->old) {
369
+			pr_debug("Warning: CPU frequency is %u, cpufreq assumed %u kHz\n",
370
+				 freqs->old, policy->cur);
371
+			freqs->old = policy->cur;
342372 		}
343373 
344
-		for_each_cpu(freqs->cpu, policy->cpus) {
345
-			srcu_notifier_call_chain(&cpufreq_transition_notifier_list,
346
-						 CPUFREQ_PRECHANGE, freqs);
347
-		}
374
+		srcu_notifier_call_chain(&cpufreq_transition_notifier_list,
375
+					 CPUFREQ_PRECHANGE, freqs);
348376 
349377 		adjust_jiffies(CPUFREQ_PRECHANGE, freqs);
350378 		break;
....@@ -354,15 +382,16 @@
354382 		pr_debug("FREQ: %u - CPUs: %*pbl\n", freqs->new,
355383 			 cpumask_pr_args(policy->cpus));
356384 
357
-		for_each_cpu(freqs->cpu, policy->cpus) {
358
-			trace_cpu_frequency(freqs->new, freqs->cpu);
359
-			srcu_notifier_call_chain(&cpufreq_transition_notifier_list,
360
-						 CPUFREQ_POSTCHANGE, freqs);
361
-		}
385
+		for_each_cpu(cpu, policy->cpus)
386
+			trace_cpu_frequency(freqs->new, cpu);
387
+
388
+		srcu_notifier_call_chain(&cpufreq_transition_notifier_list,
389
+					 CPUFREQ_POSTCHANGE, freqs);
362390 
363391 		cpufreq_stats_record_transition(policy, freqs->new);
364392 		cpufreq_times_record_transition(policy, freqs->new);
365393 		policy->cur = freqs->new;
394
+		trace_android_rvh_cpufreq_transition(policy);
366395 	}
367396 }
368397 
....@@ -416,13 +445,19 @@
416445 void cpufreq_freq_transition_end(struct cpufreq_policy *policy,
417446 		struct cpufreq_freqs *freqs, int transition_failed)
418447 {
419
-	if (unlikely(WARN_ON(!policy->transition_ongoing)))
448
+	if (WARN_ON(!policy->transition_ongoing))
420449 		return;
421450 
422451 	cpufreq_notify_post_transition(policy, freqs, transition_failed);
423452 
453
+	arch_set_freq_scale(policy->related_cpus,
454
+			    policy->cur,
455
+			    policy->cpuinfo.max_freq);
456
+
457
+	spin_lock(&policy->transition_lock);
424458 	policy->transition_ongoing = false;
425459 	policy->transition_task = NULL;
460
+	spin_unlock(&policy->transition_lock);
426461 
427462 	wake_up(&policy->transition_wait);
428463 }
....@@ -444,7 +479,7 @@
444479 	mutex_lock(&cpufreq_transition_notifier_list.mutex);
445480 
446481 	for (nb = cpufreq_transition_notifier_list.head; nb; nb = nb->next)
447
-		pr_info("%pF\n", nb->notifier_call);
482
+		pr_info("%pS\n", nb->notifier_call);
448483 
449484 	mutex_unlock(&cpufreq_transition_notifier_list.mutex);
450485 }
....@@ -499,6 +534,7 @@
499534 /**
500535  * cpufreq_driver_resolve_freq - Map a target frequency to a driver-supported
501536  * one.
537
+ * @policy: associated policy to interrogate
502538  * @target_freq: target frequency to resolve.
503539  *
504540  * The target to driver frequency mapping is cached in the policy.
....@@ -509,11 +545,14 @@
509545 unsigned int cpufreq_driver_resolve_freq(struct cpufreq_policy *policy,
510546 					 unsigned int target_freq)
511547 {
548
+	unsigned int old_target_freq = target_freq;
549
+
512550 	target_freq = clamp_val(target_freq, policy->min, policy->max);
551
+	trace_android_vh_cpufreq_resolve_freq(policy, target_freq, old_target_freq);
513552 	policy->cached_target_freq = target_freq;
514553 
515554 	if (cpufreq_driver->target_index) {
516
-		int idx;
555
+		unsigned int idx;
517556 
518557 		idx = cpufreq_frequency_table_target(policy, target_freq,
519558 						     CPUFREQ_RELATION_L);
....@@ -596,56 +635,54 @@
596635 	return NULL;
597636 }
598637 
599
-/**
600
- * cpufreq_parse_governor - parse a governor string
601
- */
602
-static int cpufreq_parse_governor(char *str_governor,
603
-				  struct cpufreq_policy *policy)
638
+static struct cpufreq_governor *get_governor(const char *str_governor)
604639 {
605
-	if (cpufreq_driver->setpolicy) {
606
-		if (!strncasecmp(str_governor, "performance", CPUFREQ_NAME_LEN)) {
607
-			policy->policy = CPUFREQ_POLICY_PERFORMANCE;
608
-			return 0;
609
-		}
640
+	struct cpufreq_governor *t;
610641 
611
-		if (!strncasecmp(str_governor, "powersave", CPUFREQ_NAME_LEN)) {
612
-			policy->policy = CPUFREQ_POLICY_POWERSAVE;
613
-			return 0;
614
-		}
615
-	} else {
616
-		struct cpufreq_governor *t;
642
+	mutex_lock(&cpufreq_governor_mutex);
643
+	t = find_governor(str_governor);
644
+	if (!t)
645
+		goto unlock;
617646 
618
-		mutex_lock(&cpufreq_governor_mutex);
647
+	if (!try_module_get(t->owner))
648
+		t = NULL;
619649 
620
-		t = find_governor(str_governor);
621
-		if (!t) {
622
-			int ret;
650
+unlock:
651
+	mutex_unlock(&cpufreq_governor_mutex);
623652 
624
-			mutex_unlock(&cpufreq_governor_mutex);
653
+	return t;
654
+}
625655 
626
-			ret = request_module("cpufreq_%s", str_governor);
627
-			if (ret)
628
-				return -EINVAL;
656
+static unsigned int cpufreq_parse_policy(char *str_governor)
657
+{
658
+	if (!strncasecmp(str_governor, "performance", CPUFREQ_NAME_LEN))
659
+		return CPUFREQ_POLICY_PERFORMANCE;
629660 
630
-			mutex_lock(&cpufreq_governor_mutex);
661
+	if (!strncasecmp(str_governor, "powersave", CPUFREQ_NAME_LEN))
662
+		return CPUFREQ_POLICY_POWERSAVE;
631663 
632
-			t = find_governor(str_governor);
633
-		}
634
-		if (t && !try_module_get(t->owner))
635
-			t = NULL;
636
-
637
-		mutex_unlock(&cpufreq_governor_mutex);
638
-
639
-		if (t) {
640
-			policy->governor = t;
641
-			return 0;
642
-		}
643
-	}
644
-
645
-	return -EINVAL;
664
+	return CPUFREQ_POLICY_UNKNOWN;
646665 }
647666 
648667 /**
668
+ * cpufreq_parse_governor - parse a governor string only for has_target()
669
+ * @str_governor: Governor name.
670
+ */
671
+static struct cpufreq_governor *cpufreq_parse_governor(char *str_governor)
672
+{
673
+	struct cpufreq_governor *t;
674
+
675
+	t = get_governor(str_governor);
676
+	if (t)
677
+		return t;
678
+
679
+	if (request_module("cpufreq_%s", str_governor))
680
+		return NULL;
681
+
682
+	return get_governor(str_governor);
683
+}
684
+
685
+/*
649686  * cpufreq_per_cpu_attr_read() / show_##file_name() -
650687  * print out cpufreq information
651688  *
....@@ -660,8 +697,16 @@
660697 	return sprintf(buf, "%u\n", policy->object);	\
661698 }
662699 
700
+static ssize_t show_cpuinfo_max_freq(struct cpufreq_policy *policy, char *buf)
701
+{
702
+	unsigned int max_freq = policy->cpuinfo.max_freq;
703
+
704
+	trace_android_vh_show_max_freq(policy, &max_freq);
705
+	trace_android_rvh_show_max_freq(policy, &max_freq);
706
+	return sprintf(buf, "%u\n", max_freq);
707
+}
708
+
663709 show_one(cpuinfo_min_freq, cpuinfo.min_freq);
664
-show_one(cpuinfo_max_freq, cpuinfo.max_freq);
665710 show_one(cpuinfo_transition_latency, cpuinfo.transition_latency);
666711 show_one(scaling_min_freq, min);
667712 show_one(scaling_max_freq, max);
....@@ -679,47 +724,35 @@
679724 	freq = arch_freq_get_on_cpu(policy->cpu);
680725 	if (freq)
681726 		ret = sprintf(buf, "%u\n", freq);
682
-	else if (cpufreq_driver && cpufreq_driver->setpolicy &&
683
-			cpufreq_driver->get)
727
+	else if (cpufreq_driver->setpolicy && cpufreq_driver->get)
684728 		ret = sprintf(buf, "%u\n", cpufreq_driver->get(policy->cpu));
685729 	else
686730 		ret = sprintf(buf, "%u\n", policy->cur);
687731 	return ret;
688732 }
689733 
690
-static int cpufreq_set_policy(struct cpufreq_policy *policy,
691
-				struct cpufreq_policy *new_policy);
692
-
693
-/**
734
+/*
694735  * cpufreq_per_cpu_attr_write() / store_##file_name() - sysfs write access
695736  */
696737 #define store_one(file_name, object)			\
697738 static ssize_t store_##file_name					\
698739 (struct cpufreq_policy *policy, const char *buf, size_t count)		\
699740 {									\
700
-	int ret, temp;							\
701
-	struct cpufreq_policy new_policy;				\
741
+	unsigned long val;						\
742
+	int ret;							\
702743 									\
703
-	memcpy(&new_policy, policy, sizeof(*policy));			\
704
-	new_policy.min = policy->user_policy.min;			\
705
-	new_policy.max = policy->user_policy.max;			\
706
-									\
707
-	ret = sscanf(buf, "%u", &new_policy.object);			\
744
+	ret = sscanf(buf, "%lu", &val);					\
708745 	if (ret != 1)							\
709746 		return -EINVAL;						\
710747 									\
711
-	temp = new_policy.object;					\
712
-	ret = cpufreq_set_policy(policy, &new_policy);		\
713
-	if (!ret)							\
714
-		policy->user_policy.object = temp;			\
715
-									\
716
-	return ret ? ret : count;					\
748
+	ret = freq_qos_update_request(policy->object##_freq_req, val);\
749
+	return ret >= 0 ? count : ret;					\
717750 }
718751 
719752 store_one(scaling_min_freq, min);
720753 store_one(scaling_max_freq, max);
721754 
722
-/**
755
+/*
723756  * show_cpuinfo_cur_freq - current CPU frequency as detected by hardware
724757  */
725758 static ssize_t show_cpuinfo_cur_freq(struct cpufreq_policy *policy,
....@@ -733,7 +766,7 @@
733766 	return sprintf(buf, "<unknown>\n");
734767 }
735768 
736
-/**
769
+/*
737770  * show_scaling_governor - show the current policy for the specified CPU
738771  */
739772 static ssize_t show_scaling_governor(struct cpufreq_policy *policy, char *buf)
....@@ -748,34 +781,44 @@
748781 	return -EINVAL;
749782 }
750783 
751
-/**
784
+/*
752785  * store_scaling_governor - store policy for the specified CPU
753786  */
754787 static ssize_t store_scaling_governor(struct cpufreq_policy *policy,
755788 					const char *buf, size_t count)
756789 {
790
+	char str_governor[16];
757791 	int ret;
758
-	char	str_governor[16];
759
-	struct cpufreq_policy new_policy;
760
-
761
-	memcpy(&new_policy, policy, sizeof(*policy));
762792 
763793 	ret = sscanf(buf, "%15s", str_governor);
764794 	if (ret != 1)
765795 		return -EINVAL;
766796 
767
-	if (cpufreq_parse_governor(str_governor, &new_policy))
768
-		return -EINVAL;
797
+	if (cpufreq_driver->setpolicy) {
798
+		unsigned int new_pol;
769799 
770
-	ret = cpufreq_set_policy(policy, &new_policy);
800
+		new_pol = cpufreq_parse_policy(str_governor);
801
+		if (!new_pol)
802
+			return -EINVAL;
771803 
772
-	if (new_policy.governor)
773
-		module_put(new_policy.governor->owner);
804
+		ret = cpufreq_set_policy(policy, NULL, new_pol);
805
+	} else {
806
+		struct cpufreq_governor *new_gov;
807
+
808
+		new_gov = cpufreq_parse_governor(str_governor);
809
+		if (!new_gov)
810
+			return -EINVAL;
811
+
812
+		ret = cpufreq_set_policy(policy, new_gov,
813
+					 CPUFREQ_POLICY_UNKNOWN);
814
+
815
+		module_put(new_gov->owner);
816
+	}
774817 
775818 	return ret ? ret : count;
776819 }
777820 
778
-/**
821
+/*
779822  * show_scaling_driver - show the cpufreq driver currently loaded
780823  */
781824 static ssize_t show_scaling_driver(struct cpufreq_policy *policy, char *buf)
....@@ -783,7 +826,7 @@
783826 	return scnprintf(buf, CPUFREQ_NAME_PLEN, "%s\n", cpufreq_driver->name);
784827 }
785828 
786
-/**
829
+/*
787830  * show_scaling_available_governors - show the available CPUfreq governors
788831  */
789832 static ssize_t show_scaling_available_governors(struct cpufreq_policy *policy,
....@@ -797,12 +840,14 @@
797840 		goto out;
798841 	}
799842 
843
+	mutex_lock(&cpufreq_governor_mutex);
800844 	for_each_governor(t) {
801845 		if (i >= (ssize_t) ((PAGE_SIZE / sizeof(char))
802846 		    - (CPUFREQ_NAME_LEN + 2)))
803
-			goto out;
847
+			break;
804848 		i += scnprintf(&buf[i], CPUFREQ_NAME_PLEN, "%s ", t->name);
805849 	}
850
+	mutex_unlock(&cpufreq_governor_mutex);
806851 out:
807852 	i += sprintf(&buf[i], "\n");
808853 	return i;
....@@ -825,7 +870,7 @@
825870 }
826871 EXPORT_SYMBOL_GPL(cpufreq_show_cpus);
827872 
828
-/**
873
+/*
829874  * show_related_cpus - show the CPUs affected by each transition even if
830875  * hw coordination is in use
831876  */
....@@ -834,7 +879,7 @@
834879 	return cpufreq_show_cpus(policy->related_cpus, buf);
835880 }
836881 
837
-/**
882
+/*
838883  * show_affected_cpus - show the CPUs affected by each transition
839884  */
840885 static ssize_t show_affected_cpus(struct cpufreq_policy *policy, char *buf)
....@@ -868,18 +913,16 @@
868913 	return policy->governor->show_setspeed(policy, buf);
869914 }
870915 
871
-/**
916
+/*
872917  * show_bios_limit - show the current cpufreq HW/BIOS limitation
873918  */
874919 static ssize_t show_bios_limit(struct cpufreq_policy *policy, char *buf)
875920 {
876921 	unsigned int limit;
877922 	int ret;
878
-	if (cpufreq_driver->bios_limit) {
879
-		ret = cpufreq_driver->bios_limit(policy->cpu, &limit);
880
-		if (!ret)
881
-			return sprintf(buf, "%u\n", limit);
882
-	}
923
+	ret = cpufreq_driver->bios_limit(policy->cpu, &limit);
924
+	if (!ret)
925
+		return sprintf(buf, "%u\n", limit);
883926 	return sprintf(buf, "%u\n", policy->cpuinfo.max_freq);
884927 }
885928 
....@@ -978,11 +1021,10 @@
9781021 	.release	= cpufreq_sysfs_release,
9791022 };
9801023 
981
-static void add_cpu_dev_symlink(struct cpufreq_policy *policy, unsigned int cpu)
1024
+static void add_cpu_dev_symlink(struct cpufreq_policy *policy, unsigned int cpu,
1025
+				struct device *dev)
9821026 {
983
-	struct device *dev = get_cpu_device(cpu);
984
-
985
-	if (!dev)
1027
+	if (unlikely(!dev))
9861028 		return;
9871029 
9881030 	if (cpumask_test_and_set_cpu(cpu, policy->real_cpus))
....@@ -1032,40 +1074,52 @@
10321074 	return 0;
10331075 }
10341076 
1035
-__weak struct cpufreq_governor *cpufreq_default_governor(void)
1036
-{
1037
-	return NULL;
1038
-}
1039
-
10401077 static int cpufreq_init_policy(struct cpufreq_policy *policy)
10411078 {
10421079 	struct cpufreq_governor *gov = NULL;
1043
-	struct cpufreq_policy new_policy;
1080
+	unsigned int pol = CPUFREQ_POLICY_UNKNOWN;
1081
+	int ret;
10441082 
1045
-	memcpy(&new_policy, policy, sizeof(*policy));
1083
+	if (has_target()) {
1084
+		/* Update policy governor to the one used before hotplug. */
1085
+		gov = get_governor(policy->last_governor);
1086
+		if (gov) {
1087
+			pr_debug("Restoring governor %s for cpu %d\n",
1088
+				 gov->name, policy->cpu);
1089
+		} else {
1090
+			gov = get_governor(default_governor);
1091
+		}
10461092 
1047
-	/* Update governor of new_policy to the governor used before hotplug */
1048
-	gov = find_governor(policy->last_governor);
1049
-	if (gov) {
1050
-		pr_debug("Restoring governor %s for cpu %d\n",
1051
-				policy->governor->name, policy->cpu);
1093
+		if (!gov) {
1094
+			gov = cpufreq_default_governor();
1095
+			__module_get(gov->owner);
1096
+		}
1097
+
10521098 	} else {
1053
-		gov = cpufreq_default_governor();
1054
-		if (!gov)
1099
+
1100
+		/* Use the default policy if there is no last_policy. */
1101
+		if (policy->last_policy) {
1102
+			pol = policy->last_policy;
1103
+		} else {
1104
+			pol = cpufreq_parse_policy(default_governor);
1105
+			/*
1106
+			 * In case the default governor is neither "performance"
1107
+			 * nor "powersave", fall back to the initial policy
1108
+			 * value set by the driver.
1109
+			 */
1110
+			if (pol == CPUFREQ_POLICY_UNKNOWN)
1111
+				pol = policy->policy;
1112
+		}
1113
+		if (pol != CPUFREQ_POLICY_PERFORMANCE &&
1114
+		    pol != CPUFREQ_POLICY_POWERSAVE)
10551115 			return -ENODATA;
10561116 	}
10571117 
1058
-	new_policy.governor = gov;
1118
+	ret = cpufreq_set_policy(policy, gov, pol);
1119
+	if (gov)
1120
+		module_put(gov->owner);
10591121 
1060
-	/* Use the default policy if there is no last_policy. */
1061
-	if (cpufreq_driver->setpolicy) {
1062
-		if (policy->last_policy)
1063
-			new_policy.policy = policy->last_policy;
1064
-		else
1065
-			cpufreq_parse_governor(gov->name, &new_policy);
1066
-	}
1067
-	/* set default policy */
1068
-	return cpufreq_set_policy(policy, &new_policy);
1122
+	return ret;
10691123 }
10701124 
10711125 static int cpufreq_add_policy_cpu(struct cpufreq_policy *policy, unsigned int cpu)
....@@ -1091,61 +1145,43 @@
10911145 	return ret;
10921146 }
10931147 
1148
+void refresh_frequency_limits(struct cpufreq_policy *policy)
1149
+{
1150
+	if (!policy_is_inactive(policy)) {
1151
+		pr_debug("updating policy for CPU %u\n", policy->cpu);
1152
+
1153
+		cpufreq_set_policy(policy, policy->governor, policy->policy);
1154
+	}
1155
+}
1156
+EXPORT_SYMBOL(refresh_frequency_limits);
1157
+
10941158 static void handle_update(struct work_struct *work)
10951159 {
10961160 	struct cpufreq_policy *policy =
10971161 		container_of(work, struct cpufreq_policy, update);
1098
-	unsigned int cpu = policy->cpu;
1099
-	pr_debug("handle_update for cpu %u called\n", cpu);
1100
-	cpufreq_update_policy(cpu);
1162
+
1163
+	pr_debug("handle_update for cpu %u called\n", policy->cpu);
1164
+	down_write(&policy->rwsem);
1165
+	refresh_frequency_limits(policy);
1166
+	up_write(&policy->rwsem);
11011167 }
11021168 
1103
-static struct cpufreq_policy *cpufreq_policy_alloc(unsigned int cpu)
1169
+static int cpufreq_notifier_min(struct notifier_block *nb, unsigned long freq,
1170
+				void *data)
11041171 {
1105
-	struct cpufreq_policy *policy;
1106
-	int ret;
1172
+	struct cpufreq_policy *policy = container_of(nb, struct cpufreq_policy, nb_min);
11071173 
1108
-	policy = kzalloc(sizeof(*policy), GFP_KERNEL);
1109
-	if (!policy)
1110
-		return NULL;
1174
+	schedule_work(&policy->update);
1175
+	return 0;
1176
+}
11111177 
1112
-	if (!alloc_cpumask_var(&policy->cpus, GFP_KERNEL))
1113
-		goto err_free_policy;
1178
+static int cpufreq_notifier_max(struct notifier_block *nb, unsigned long freq,
1179
+				void *data)
1180
+{
1181
+	struct cpufreq_policy *policy = container_of(nb, struct cpufreq_policy, nb_max);
11141182 
1115
-	if (!zalloc_cpumask_var(&policy->related_cpus, GFP_KERNEL))
1116
-		goto err_free_cpumask;
1117
-
1118
-	if (!zalloc_cpumask_var(&policy->real_cpus, GFP_KERNEL))
1119
-		goto err_free_rcpumask;
1120
-
1121
-	ret = kobject_init_and_add(&policy->kobj, &ktype_cpufreq,
1122
-				   cpufreq_global_kobject, "policy%u", cpu);
1123
-	if (ret) {
1124
-		pr_err("%s: failed to init policy->kobj: %d\n", __func__, ret);
1125
-		kobject_put(&policy->kobj);
1126
-		goto err_free_real_cpus;
1127
-	}
1128
-
1129
-	INIT_LIST_HEAD(&policy->policy_list);
1130
-	init_rwsem(&policy->rwsem);
1131
-	spin_lock_init(&policy->transition_lock);
1132
-	init_waitqueue_head(&policy->transition_wait);
1133
-	init_completion(&policy->kobj_unregister);
1134
-	INIT_WORK(&policy->update, handle_update);
1135
-
1136
-	policy->cpu = cpu;
1137
-	return policy;
1138
-
1139
-err_free_real_cpus:
1140
-	free_cpumask_var(policy->real_cpus);
1141
-err_free_rcpumask:
1142
-	free_cpumask_var(policy->related_cpus);
1143
-err_free_cpumask:
1144
-	free_cpumask_var(policy->cpus);
1145
-err_free_policy:
1146
-	kfree(policy);
1147
-
1148
-	return NULL;
1183
+	schedule_work(&policy->update);
1184
+	return 0;
11491185 }
11501186 
11511187 static void cpufreq_policy_put_kobj(struct cpufreq_policy *policy)
....@@ -1170,6 +1206,89 @@
11701206 	pr_debug("wait complete\n");
11711207 }
11721208 
1209
+static struct cpufreq_policy *cpufreq_policy_alloc(unsigned int cpu)
1210
+{
1211
+	struct cpufreq_policy *policy;
1212
+	struct device *dev = get_cpu_device(cpu);
1213
+	int ret;
1214
+
1215
+	if (!dev)
1216
+		return NULL;
1217
+
1218
+	policy = kzalloc(sizeof(*policy), GFP_KERNEL);
1219
+	if (!policy)
1220
+		return NULL;
1221
+
1222
+	if (!alloc_cpumask_var(&policy->cpus, GFP_KERNEL))
1223
+		goto err_free_policy;
1224
+
1225
+	if (!zalloc_cpumask_var(&policy->related_cpus, GFP_KERNEL))
1226
+		goto err_free_cpumask;
1227
+
1228
+	if (!zalloc_cpumask_var(&policy->real_cpus, GFP_KERNEL))
1229
+		goto err_free_rcpumask;
1230
+
1231
+	init_completion(&policy->kobj_unregister);
1232
+	ret = kobject_init_and_add(&policy->kobj, &ktype_cpufreq,
1233
+				   cpufreq_global_kobject, "policy%u", cpu);
1234
+	if (ret) {
1235
+		dev_err(dev, "%s: failed to init policy->kobj: %d\n", __func__, ret);
1236
+		/*
1237
+		 * The entire policy object will be freed below, but the extra
1238
+		 * memory allocated for the kobject name needs to be freed by
1239
+		 * releasing the kobject.
1240
+		 */
1241
+		kobject_put(&policy->kobj);
1242
+		goto err_free_real_cpus;
1243
+	}
1244
+
1245
+	freq_constraints_init(&policy->constraints);
1246
+
1247
+	policy->nb_min.notifier_call = cpufreq_notifier_min;
1248
+	policy->nb_max.notifier_call = cpufreq_notifier_max;
1249
+
1250
+	ret = freq_qos_add_notifier(&policy->constraints, FREQ_QOS_MIN,
1251
+				    &policy->nb_min);
1252
+	if (ret) {
1253
+		dev_err(dev, "Failed to register MIN QoS notifier: %d (%*pbl)\n",
1254
+			ret, cpumask_pr_args(policy->cpus));
1255
+		goto err_kobj_remove;
1256
+	}
1257
+
1258
+	ret = freq_qos_add_notifier(&policy->constraints, FREQ_QOS_MAX,
1259
+				    &policy->nb_max);
1260
+	if (ret) {
1261
+		dev_err(dev, "Failed to register MAX QoS notifier: %d (%*pbl)\n",
1262
+			ret, cpumask_pr_args(policy->cpus));
1263
+		goto err_min_qos_notifier;
1264
+	}
1265
+
1266
+	INIT_LIST_HEAD(&policy->policy_list);
1267
+	init_rwsem(&policy->rwsem);
1268
+	spin_lock_init(&policy->transition_lock);
1269
+	init_waitqueue_head(&policy->transition_wait);
1270
+	INIT_WORK(&policy->update, handle_update);
1271
+
1272
+	policy->cpu = cpu;
1273
+	return policy;
1274
+
1275
+err_min_qos_notifier:
1276
+	freq_qos_remove_notifier(&policy->constraints, FREQ_QOS_MIN,
1277
+				 &policy->nb_min);
1278
+err_kobj_remove:
1279
+	cpufreq_policy_put_kobj(policy);
1280
+err_free_real_cpus:
1281
+	free_cpumask_var(policy->real_cpus);
1282
+err_free_rcpumask:
1283
+	free_cpumask_var(policy->related_cpus);
1284
+err_free_cpumask:
1285
+	free_cpumask_var(policy->cpus);
1286
+err_free_policy:
1287
+	kfree(policy);
1288
+
1289
+	return NULL;
1290
+}
1291
+
11731292 static void cpufreq_policy_free(struct cpufreq_policy *policy)
11741293 {
11751294 	unsigned long flags;
....@@ -1182,6 +1301,27 @@
11821301 	for_each_cpu(cpu, policy->related_cpus)
11831302 		per_cpu(cpufreq_cpu_data, cpu) = NULL;
11841303 	write_unlock_irqrestore(&cpufreq_driver_lock, flags);
1304
+
1305
+	freq_qos_remove_notifier(&policy->constraints, FREQ_QOS_MAX,
1306
+				 &policy->nb_max);
1307
+	freq_qos_remove_notifier(&policy->constraints, FREQ_QOS_MIN,
1308
+				 &policy->nb_min);
1309
+
1310
+	/* Cancel any pending policy->update work before freeing the policy. */
1311
+	cancel_work_sync(&policy->update);
1312
+
1313
+	if (policy->max_freq_req) {
1314
+		/*
1315
+		 * CPUFREQ_CREATE_POLICY notification is sent only after
1316
+		 * successfully adding max_freq_req request.
1317
+		 */
1318
+		blocking_notifier_call_chain(&cpufreq_policy_notifier_list,
1319
+					     CPUFREQ_REMOVE_POLICY, policy);
1320
+		freq_qos_remove_request(policy->max_freq_req);
1321
+	}
1322
+
1323
+	freq_qos_remove_request(policy->min_freq_req);
1324
+	kfree(policy->min_freq_req);
11851325 
11861326 	cpufreq_policy_put_kobj(policy);
11871327 	free_cpumask_var(policy->real_cpus);
....@@ -1220,28 +1360,44 @@
12201360 			return -ENOMEM;
12211361 	}
12221362 
1223
-	cpumask_copy(policy->cpus, cpumask_of(cpu));
1363
+	if (!new_policy && cpufreq_driver->online) {
1364
+		ret = cpufreq_driver->online(policy);
1365
+		if (ret) {
1366
+			pr_debug("%s: %d: initialization failed\n", __func__,
1367
+				 __LINE__);
1368
+			goto out_exit_policy;
1369
+		}
12241370 
1225
-	/* call driver. From then on the cpufreq must be able
1226
-	 * to accept all calls to ->verify and ->setpolicy for this CPU
1227
-	 */
1228
-	ret = cpufreq_driver->init(policy);
1229
-	if (ret) {
1230
-		pr_debug("initialization failed\n");
1231
-		goto out_free_policy;
1232
-	}
1371
+		/* Recover policy->cpus using related_cpus */
1372
+		cpumask_copy(policy->cpus, policy->related_cpus);
1373
+	} else {
1374
+		cpumask_copy(policy->cpus, cpumask_of(cpu));
12331375 
1234
-	ret = cpufreq_table_validate_and_sort(policy);
1235
-	if (ret)
1236
-		goto out_exit_policy;
1376
+		/*
1377
+		 * Call driver. From then on the cpufreq must be able
1378
+		 * to accept all calls to ->verify and ->setpolicy for this CPU.
1379
+		 */
1380
+		ret = cpufreq_driver->init(policy);
1381
+		if (ret) {
1382
+			pr_debug("%s: %d: initialization failed\n", __func__,
1383
+				 __LINE__);
1384
+			goto out_free_policy;
1385
+		}
12371386 
1238
-	down_write(&policy->rwsem);
1387
+		/*
1388
+		 * The initialization has succeeded and the policy is online.
1389
+		 * If there is a problem with its frequency table, take it
1390
+		 * offline and drop it.
1391
+		 */
1392
+		ret = cpufreq_table_validate_and_sort(policy);
1393
+		if (ret)
1394
+			goto out_offline_policy;
12391395 
1240
-	if (new_policy) {
12411396 		/* related_cpus should at least include policy->cpus. */
12421397 		cpumask_copy(policy->related_cpus, policy->cpus);
12431398 	}
12441399 
1400
+	down_write(&policy->rwsem);
12451401 	/*
12461402 	 * affected cpus must always be the one, which are online. We aren't
12471403 	 * managing offline cpus here.
....@@ -1249,19 +1405,49 @@
12491405 	cpumask_and(policy->cpus, policy->cpus, cpu_online_mask);
12501406 
12511407 	if (new_policy) {
1252
-		policy->user_policy.min = policy->min;
1253
-		policy->user_policy.max = policy->max;
1254
-
12551408 		for_each_cpu(j, policy->related_cpus) {
12561409 			per_cpu(cpufreq_cpu_data, j) = policy;
1257
-			add_cpu_dev_symlink(policy, j);
1410
+			add_cpu_dev_symlink(policy, j, get_cpu_device(j));
12581411 		}
1259
-	} else {
1260
-		policy->min = policy->user_policy.min;
1261
-		policy->max = policy->user_policy.max;
1412
+
1413
+		policy->min_freq_req = kzalloc(2 * sizeof(*policy->min_freq_req),
1414
+					       GFP_KERNEL);
1415
+		if (!policy->min_freq_req)
1416
+			goto out_destroy_policy;
1417
+
1418
+		ret = freq_qos_add_request(&policy->constraints,
1419
+					   policy->min_freq_req, FREQ_QOS_MIN,
1420
+					   FREQ_QOS_MIN_DEFAULT_VALUE);
1421
+		if (ret < 0) {
1422
+			/*
1423
+			 * So we don't call freq_qos_remove_request() for an
1424
+			 * uninitialized request.
1425
+			 */
1426
+			kfree(policy->min_freq_req);
1427
+			policy->min_freq_req = NULL;
1428
+			goto out_destroy_policy;
1429
+		}
1430
+
1431
+		/*
1432
+		 * This must be initialized right here to avoid calling
1433
+		 * freq_qos_remove_request() on uninitialized request in case
1434
+		 * of errors.
1435
+		 */
1436
+		policy->max_freq_req = policy->min_freq_req + 1;
1437
+
1438
+		ret = freq_qos_add_request(&policy->constraints,
1439
+					   policy->max_freq_req, FREQ_QOS_MAX,
1440
+					   FREQ_QOS_MAX_DEFAULT_VALUE);
1441
+		if (ret < 0) {
1442
+			policy->max_freq_req = NULL;
1443
+			goto out_destroy_policy;
1444
+		}
1445
+
1446
+		blocking_notifier_call_chain(&cpufreq_policy_notifier_list,
1447
+				CPUFREQ_CREATE_POLICY, policy);
12621448 	}
12631449 
1264
-	if (cpufreq_driver->get && !cpufreq_driver->setpolicy) {
1450
+	if (cpufreq_driver->get && has_target()) {
12651451 		policy->cur = cpufreq_driver->get(policy->cpu);
12661452 		if (!policy->cur) {
12671453 			pr_err("%s: ->get() failed\n", __func__);
....@@ -1289,14 +1475,13 @@
12891475 	 */
12901476 	if ((cpufreq_driver->flags & CPUFREQ_NEED_INITIAL_FREQ_CHECK)
12911477 	    && has_target()) {
1478
+		unsigned int old_freq = policy->cur;
1479
+
12921480 		/* Are we running at unknown frequency ? */
1293
-		ret = cpufreq_frequency_table_get_index(policy, policy->cur);
1481
+		ret = cpufreq_frequency_table_get_index(policy, old_freq);
12941482 		if (ret == -EINVAL) {
1295
-			/* Warn user and fix it */
1296
-			pr_warn("%s: CPU%d: Running at unlisted freq: %u KHz\n",
1297
-				__func__, policy->cpu, policy->cur);
1298
-			ret = __cpufreq_driver_target(policy, policy->cur - 1,
1299
-				CPUFREQ_RELATION_L);
1483
+			ret = __cpufreq_driver_target(policy, old_freq - 1,
1484
+						      CPUFREQ_RELATION_L);
13001485 
13011486 			/*
13021487 			 * Reaching here after boot in a few seconds may not
....@@ -1304,8 +1489,8 @@
13041489 			 * frequency for longer duration. Hence, a BUG_ON().
13051490 			 */
13061491 			BUG_ON(ret);
1307
-			pr_warn("%s: CPU%d: Unlisted initial frequency changed to: %u KHz\n",
1308
-				__func__, policy->cpu, policy->cur);
1492
+			pr_info("%s: CPU%d: Running at unlisted initial frequency: %u KHz, changing to: %u KHz\n",
1493
+				__func__, policy->cpu, old_freq, policy->cur);
13091494 		}
13101495 	}
13111496 
....@@ -1326,8 +1511,6 @@
13261511 	if (ret) {
13271512 		pr_err("%s: Failed to initialize policy for cpu: %d (%d)\n",
13281513 		       __func__, cpu, ret);
1329
-		/* cpufreq_policy_free() will notify based on this */
1330
-		new_policy = false;
13311514 		goto out_destroy_policy;
13321515 	}
13331516 
....@@ -1339,8 +1522,7 @@
13391522 	if (cpufreq_driver->ready)
13401523 		cpufreq_driver->ready(policy);
13411524 
1342
-	if (IS_ENABLED(CONFIG_CPU_THERMAL) &&
1343
-	    cpufreq_driver->flags & CPUFREQ_IS_COOLING_DEV)
1525
+	if (cpufreq_thermal_control_enabled(cpufreq_driver))
13441526 		policy->cdev = of_cpufreq_cooling_register(policy);
13451527 
13461528 	pr_debug("initialization complete\n");
....@@ -1352,6 +1534,10 @@
13521534 		remove_cpu_dev_symlink(policy, get_cpu_device(j));
13531535 
13541536 	up_write(&policy->rwsem);
1537
+
1538
+out_offline_policy:
1539
+	if (cpufreq_driver->offline)
1540
+		cpufreq_driver->offline(policy);
13551541 
13561542 out_exit_policy:
13571543 	if (cpufreq_driver->exit)
....@@ -1384,7 +1570,7 @@
13841570 	/* Create sysfs link on CPU registration */
13851571 	policy = per_cpu(cpufreq_cpu_data, cpu);
13861572 	if (policy)
1387
-		add_cpu_dev_symlink(policy, cpu);
1573
+		add_cpu_dev_symlink(policy, cpu, dev);
13881574 
13891575 	return 0;
13901576 }
....@@ -1430,8 +1616,7 @@
14301616 		goto unlock;
14311617 	}
14321618 
1433
-	if (IS_ENABLED(CONFIG_CPU_THERMAL) &&
1434
-	    cpufreq_driver->flags & CPUFREQ_IS_COOLING_DEV) {
1619
+	if (cpufreq_thermal_control_enabled(cpufreq_driver)) {
14351620 		cpufreq_cooling_unregister(policy->cdev);
14361621 		policy->cdev = NULL;
14371622 	}
....@@ -1443,11 +1628,12 @@
14431628 		cpufreq_exit_governor(policy);
14441629 
14451630 	/*
1446
-	 * Perform the ->exit() even during light-weight tear-down,
1447
-	 * since this is a core component, and is essential for the
1448
-	 * subsequent light-weight ->init() to succeed.
1631
+	 * Perform the ->offline() during light-weight tear-down, as
1632
+	 * that allows fast recovery when the CPU comes back.
14491633 	 */
1450
-	if (cpufreq_driver->exit) {
1634
+	if (cpufreq_driver->offline) {
1635
+		cpufreq_driver->offline(policy);
1636
+	} else if (cpufreq_driver->exit) {
14511637 		cpufreq_driver->exit(policy);
14521638 		policy->freq_table = NULL;
14531639 	}
....@@ -1457,7 +1643,7 @@
14571643 	return 0;
14581644 }
14591645 
1460
-/**
1646
+/*
14611647  * cpufreq_remove_dev - remove a CPU device
14621648  *
14631649  * Removes the cpufreq interface for a CPU device.
....@@ -1476,8 +1662,13 @@
14761662 	cpumask_clear_cpu(cpu, policy->real_cpus);
14771663 	remove_cpu_dev_symlink(policy, dev);
14781664 
1479
-	if (cpumask_empty(policy->real_cpus))
1665
+	if (cpumask_empty(policy->real_cpus)) {
1666
+		/* We did light-weight exit earlier, do full tear down now */
1667
+		if (cpufreq_driver->offline)
1668
+			cpufreq_driver->exit(policy);
1669
+
14801670 		cpufreq_policy_free(policy);
1671
+	}
14811672 }
14821673 
14831674 /**
....@@ -1502,6 +1693,30 @@
15021693 
15031694 	cpufreq_freq_transition_begin(policy, &freqs);
15041695 	cpufreq_freq_transition_end(policy, &freqs, 0);
1696
+}
1697
+
1698
+static unsigned int cpufreq_verify_current_freq(struct cpufreq_policy *policy, bool update)
1699
+{
1700
+	unsigned int new_freq;
1701
+
1702
+	new_freq = cpufreq_driver->get(policy->cpu);
1703
+	if (!new_freq)
1704
+		return 0;
1705
+
1706
+	/*
1707
+	 * If fast frequency switching is used with the given policy, the check
1708
+	 * against policy->cur is pointless, so skip it in that case.
1709
+	 */
1710
+	if (policy->fast_switch_enabled || !has_target())
1711
+		return new_freq;
1712
+
1713
+	if (policy->cur != new_freq) {
1714
+		cpufreq_out_of_sync(policy, new_freq);
1715
+		if (update)
1716
+			schedule_work(&policy->update);
1717
+	}
1718
+
1719
+	return new_freq;
15051720 }
15061721 
15071722 /**
....@@ -1557,33 +1772,32 @@
15571772 }
15581773 EXPORT_SYMBOL(cpufreq_quick_get_max);
15591774 
1560
-static unsigned int __cpufreq_get(struct cpufreq_policy *policy)
1775
+/**
1776
+ * cpufreq_get_hw_max_freq - get the max hardware frequency of the CPU
1777
+ * @cpu: CPU number
1778
+ *
1779
+ * The default return value is the max_freq field of cpuinfo.
1780
+ */
1781
+__weak unsigned int cpufreq_get_hw_max_freq(unsigned int cpu)
15611782 {
1783
+	struct cpufreq_policy *policy = cpufreq_cpu_get(cpu);
15621784 	unsigned int ret_freq = 0;
15631785 
1564
-	if (unlikely(policy_is_inactive(policy)) || !cpufreq_driver->get)
1565
-		return ret_freq;
1566
-
1567
-	ret_freq = cpufreq_driver->get(policy->cpu);
1568
-
1569
-	/*
1570
-	 * If fast frequency switching is used with the given policy, the check
1571
-	 * against policy->cur is pointless, so skip it in that case too.
1572
-	 */
1573
-	if (policy->fast_switch_enabled)
1574
-		return ret_freq;
1575
-
1576
-	if (ret_freq && policy->cur &&
1577
-		!(cpufreq_driver->flags & CPUFREQ_CONST_LOOPS)) {
1578
-		/* verify no discrepancy between actual and
1579
-					saved value exists */
1580
-		if (unlikely(ret_freq != policy->cur)) {
1581
-			cpufreq_out_of_sync(policy, ret_freq);
1582
-			schedule_work(&policy->update);
1583
-		}
1786
+	if (policy) {
1787
+		ret_freq = policy->cpuinfo.max_freq;
1788
+		cpufreq_cpu_put(policy);
15841789 	}
15851790 
15861791 	return ret_freq;
1792
+}
1793
+EXPORT_SYMBOL(cpufreq_get_hw_max_freq);
1794
+
1795
+static unsigned int __cpufreq_get(struct cpufreq_policy *policy)
1796
+{
1797
+	if (unlikely(policy_is_inactive(policy)))
1798
+		return 0;
1799
+
1800
+	return cpufreq_verify_current_freq(policy, true);
15871801 }
15881802 
15891803 /**
....@@ -1599,7 +1813,8 @@
15991813 
16001814 	if (policy) {
16011815 		down_read(&policy->rwsem);
1602
-		ret_freq = __cpufreq_get(policy);
1816
+		if (cpufreq_driver->get)
1817
+			ret_freq = __cpufreq_get(policy);
16031818 		up_read(&policy->rwsem);
16041819 
16051820 		cpufreq_cpu_put(policy);
....@@ -1608,24 +1823,6 @@
16081823 	return ret_freq;
16091824 }
16101825 EXPORT_SYMBOL(cpufreq_get);
1611
-
1612
-static unsigned int cpufreq_update_current_freq(struct cpufreq_policy *policy)
1613
-{
1614
-	unsigned int new_freq;
1615
-
1616
-	new_freq = cpufreq_driver->get(policy->cpu);
1617
-	if (!new_freq)
1618
-		return 0;
1619
-
1620
-	if (!policy->cur) {
1621
-		pr_debug("cpufreq: Driver did not initialize current freq\n");
1622
-		policy->cur = new_freq;
1623
-	} else if (policy->cur != new_freq && has_target()) {
1624
-		cpufreq_out_of_sync(policy, new_freq);
1625
-	}
1626
-
1627
-	return new_freq;
1628
-}
16291826 
16301827 static struct subsys_interface cpufreq_interface = {
16311828 	.name		= "cpufreq",
....@@ -1688,8 +1885,8 @@
16881885 		}
16891886 
16901887 		if (cpufreq_driver->suspend && cpufreq_driver->suspend(policy))
1691
-			pr_err("%s: Failed to suspend driver: %p\n", __func__,
1692
-				policy);
1888
+			pr_err("%s: Failed to suspend driver: %s\n", __func__,
1889
+				cpufreq_driver->name);
16931890 	}
16941891 
16951892 suspend:
....@@ -1734,6 +1931,18 @@
17341931 				       __func__, policy);
17351932 		}
17361933 	}
1934
+}
1935
+
1936
+/**
1937
+ * cpufreq_driver_test_flags - Test cpufreq driver's flags against given ones.
1938
+ * @flags: Flags to test against the current cpufreq driver's flags.
1939
+ *
1940
+ * Assumes that the driver is there, so callers must ensure that this is the
1941
+ * case.
1942
+ */
1943
+bool cpufreq_driver_test_flags(u16 flags)
1944
+{
1945
+	return !!(cpufreq_driver->flags & flags);
17371946 }
17381947 
17391948 /**
....@@ -1888,15 +2097,30 @@
18882097 unsigned int cpufreq_driver_fast_switch(struct cpufreq_policy *policy,
18892098 					unsigned int target_freq)
18902099 {
1891
-	int ret;
2100
+	unsigned int freq;
2101
+	unsigned int old_target_freq = target_freq;
2102
+	int cpu;
18922103 
18932104 	target_freq = clamp_val(target_freq, policy->min, policy->max);
2105
+	trace_android_vh_cpufreq_fast_switch(policy, target_freq, old_target_freq);
2106
+	freq = cpufreq_driver->fast_switch(policy, target_freq);
18942107 
1895
-	ret = cpufreq_driver->fast_switch(policy, target_freq);
1896
-	if (ret)
1897
-		cpufreq_times_record_transition(policy, ret);
2108
+	if (!freq)
2109
+		return 0;
18982110 
1899
-	return ret;
2111
+	policy->cur = freq;
2112
+	arch_set_freq_scale(policy->related_cpus, freq,
2113
+			    policy->cpuinfo.max_freq);
2114
+	cpufreq_stats_record_transition(policy, freq);
2115
+	cpufreq_times_record_transition(policy, freq);
2116
+	trace_android_rvh_cpufreq_transition(policy);
2117
+
2118
+	if (trace_cpu_frequency_enabled()) {
2119
+		for_each_cpu(cpu, policy->cpus)
2120
+			trace_cpu_frequency(freq, cpu);
2121
+	}
2122
+
2123
+	return freq;
19002124 }
19012125 EXPORT_SYMBOL_GPL(cpufreq_driver_fast_switch);
19022126 
....@@ -1993,11 +2217,9 @@
19932217 	if (cpufreq_disabled())
19942218 		return -ENODEV;
19952219 
1996
-#ifdef CONFIG_ARM_ROCKCHIP_CPUFREQ
1997
-	target_freq = rockchip_cpufreq_adjust_target(policy->cpu, target_freq);
1998
-#endif
19992220 	/* Make sure that target_freq is within supported range */
20002221 	target_freq = clamp_val(target_freq, policy->min, policy->max);
2222
+	trace_android_vh_cpufreq_target(policy, target_freq, old_target_freq);
20012223 
20022224 	pr_debug("target for CPU %u: %u kHz, relation %u, requested %u kHz\n",
20032225 		 policy->cpu, target_freq, relation, old_target_freq);
....@@ -2008,7 +2230,8 @@
20082230 	 * exactly same freq is called again and so we can save on few function
20092231 	 * calls.
20102232 	 */
2011
-	if (target_freq == policy->cur)
2233
+	if (target_freq == policy->cur &&
2234
+	    !(cpufreq_driver->flags & CPUFREQ_NEED_UPDATE_LIMITS))
20122235 		return 0;
20132236 
20142237 	/* Save last value to restore later on errors */
....@@ -2030,7 +2253,7 @@
20302253 			  unsigned int target_freq,
20312254 			  unsigned int relation)
20322255 {
2033
-	int ret = -EINVAL;
2256
+	int ret;
20342257 
20352258 	down_write(&policy->rwsem);
20362259 
....@@ -2062,7 +2285,7 @@
20622285 		return -EINVAL;
20632286 
20642287 	/* Platform doesn't want dynamic frequency switching ? */
2065
-	if (policy->governor->dynamic_switching &&
2288
+	if (policy->governor->flags & CPUFREQ_GOV_DYNAMIC_SWITCHING &&
20662289 	    cpufreq_driver->flags & CPUFREQ_NO_AUTO_DYNAMIC_SWITCHING) {
20672290 		struct cpufreq_governor *gov = cpufreq_fallback_governor();
20682291 
....@@ -2088,6 +2311,8 @@
20882311 		}
20892312 	}
20902313 
2314
+	policy->strict_target = !!(policy->governor->flags & CPUFREQ_GOV_STRICT_TARGET);
2315
+
20912316 	return 0;
20922317 }
20932318 
....@@ -2104,7 +2329,7 @@
21042329 	module_put(policy->governor->owner);
21052330 }
21062331 
2107
-static int cpufreq_start_governor(struct cpufreq_policy *policy)
2332
+int cpufreq_start_governor(struct cpufreq_policy *policy)
21082333 {
21092334 	int ret;
21102335 
....@@ -2116,8 +2341,8 @@
21162341 
21172342 	pr_debug("%s: for CPU %u\n", __func__, policy->cpu);
21182343 
2119
-	if (cpufreq_driver->get && !cpufreq_driver->setpolicy)
2120
-		cpufreq_update_current_freq(policy);
2344
+	if (cpufreq_driver->get)
2345
+		cpufreq_verify_current_freq(policy, false);
21212346 
21222347 	if (policy->governor->start) {
21232348 		ret = policy->governor->start(policy);
....@@ -2131,7 +2356,7 @@
21312356 	return 0;
21322357 }
21332358 
2134
-static void cpufreq_stop_governor(struct cpufreq_policy *policy)
2359
+void cpufreq_stop_governor(struct cpufreq_policy *policy)
21352360 {
21362361 	if (cpufreq_suspended || !policy->governor)
21372362 		return;
....@@ -2212,6 +2437,7 @@
22122437  * cpufreq_get_policy - get the current cpufreq_policy
22132438  * @policy: struct cpufreq_policy into which the current cpufreq_policy
22142439  *	is written
2440
+ * @cpu: CPU to find the policy for
22152441  *
22162442  * Reads the current cpufreq policy.
22172443  */
....@@ -2232,54 +2458,53 @@
22322458 }
22332459 EXPORT_SYMBOL(cpufreq_get_policy);
22342460 
2235
-/*
2236
- * policy : current policy.
2237
- * new_policy: policy to be set.
2461
+/**
2462
+ * cpufreq_set_policy - Modify cpufreq policy parameters.
2463
+ * @policy: Policy object to modify.
2464
+ * @new_gov: Policy governor pointer.
2465
+ * @new_pol: Policy value (for drivers with built-in governors).
2466
+ *
2467
+ * Invoke the cpufreq driver's ->verify() callback to sanity-check the frequency
2468
+ * limits to be set for the policy, update @policy with the verified limits
2469
+ * values and either invoke the driver's ->setpolicy() callback (if present) or
2470
+ * carry out a governor update for @policy.  That is, run the current governor's
2471
+ * ->limits() callback (if @new_gov points to the same object as the one in
2472
+ * @policy) or replace the governor for @policy with @new_gov.
2473
+ *
2474
+ * The cpuinfo part of @policy is not updated by this function.
22382475  */
22392476 static int cpufreq_set_policy(struct cpufreq_policy *policy,
2240
-				struct cpufreq_policy *new_policy)
2477
+			      struct cpufreq_governor *new_gov,
2478
+			      unsigned int new_pol)
22412479 {
2480
+	struct cpufreq_policy_data new_data;
22422481 	struct cpufreq_governor *old_gov;
22432482 	int ret;
22442483 
2245
-	pr_debug("setting new policy for CPU %u: %u - %u kHz\n",
2246
-		 new_policy->cpu, new_policy->min, new_policy->max);
2247
-
2248
-	memcpy(&new_policy->cpuinfo, &policy->cpuinfo, sizeof(policy->cpuinfo));
2249
-
2484
+	memcpy(&new_data.cpuinfo, &policy->cpuinfo, sizeof(policy->cpuinfo));
2485
+	new_data.freq_table = policy->freq_table;
2486
+	new_data.cpu = policy->cpu;
22502487 	/*
2251
-	* This check works well when we store new min/max freq attributes,
2252
-	* because new_policy is a copy of policy with one field updated.
2253
-	*/
2254
-	if (new_policy->min > new_policy->max)
2255
-		return -EINVAL;
2256
-
2257
-	/* verify the cpu speed can be set within this limit */
2258
-	ret = cpufreq_driver->verify(new_policy);
2259
-	if (ret)
2260
-		return ret;
2261
-
2262
-	/* adjust if necessary - all reasons */
2263
-	blocking_notifier_call_chain(&cpufreq_policy_notifier_list,
2264
-			CPUFREQ_ADJUST, new_policy);
2265
-
2266
-	/*
2267
-	 * verify the cpu speed can be set within this limit, which might be
2268
-	 * different to the first one
2488
+	 * PM QoS framework collects all the requests from users and provide us
2489
+	 * the final aggregated value here.
22692490 	 */
2270
-	ret = cpufreq_driver->verify(new_policy);
2491
+	new_data.min = freq_qos_read_value(&policy->constraints, FREQ_QOS_MIN);
2492
+	new_data.max = freq_qos_read_value(&policy->constraints, FREQ_QOS_MAX);
2493
+
2494
+	pr_debug("setting new policy for CPU %u: %u - %u kHz\n",
2495
+		 new_data.cpu, new_data.min, new_data.max);
2496
+
2497
+	/*
2498
+	 * Verify that the CPU speed can be set within these limits and make sure
2499
+	 * that min <= max.
2500
+	 */
2501
+	ret = cpufreq_driver->verify(&new_data);
22712502 	if (ret)
22722503 		return ret;
22732504 
2274
-	/* notification of the new policy */
2275
-	blocking_notifier_call_chain(&cpufreq_policy_notifier_list,
2276
-			CPUFREQ_NOTIFY, new_policy);
2277
-
2278
-	policy->min = new_policy->min;
2279
-	policy->max = new_policy->max;
2505
+	policy->min = new_data.min;
2506
+	policy->max = new_data.max;
22802507 	trace_cpu_frequency_limits(policy);
2281
-
2282
-	arch_set_max_freq_scale(policy->cpus, policy->max);
22832508 
22842509 	policy->cached_target_freq = UINT_MAX;
22852510 
....@@ -2287,13 +2512,13 @@
22872512 		 policy->min, policy->max);
22882513 
22892514 	if (cpufreq_driver->setpolicy) {
2290
-		policy->policy = new_policy->policy;
2515
+		policy->policy = new_pol;
22912516 		pr_debug("setting range\n");
2292
-		return cpufreq_driver->setpolicy(new_policy);
2517
+		return cpufreq_driver->setpolicy(policy);
22932518 	}
22942519 
2295
-	if (new_policy->governor == policy->governor) {
2296
-		pr_debug("cpufreq: governor limits update\n");
2520
+	if (new_gov == policy->governor) {
2521
+		pr_debug("governor limits update\n");
22972522 		cpufreq_governor_limits(policy);
22982523 		return 0;
22992524 	}
....@@ -2309,12 +2534,12 @@
23092534 	}
23102535 
23112536 	/* start new governor */
2312
-	policy->governor = new_policy->governor;
2537
+	policy->governor = new_gov;
23132538 	ret = cpufreq_init_governor(policy);
23142539 	if (!ret) {
23152540 		ret = cpufreq_start_governor(policy);
23162541 		if (!ret) {
2317
-			pr_debug("cpufreq: governor change\n");
2542
+			pr_debug("governor change\n");
23182543 			return 0;
23192544 		}
23202545 		cpufreq_exit_governor(policy);
....@@ -2332,85 +2557,81 @@
23322557 
23332558 	return ret;
23342559 }
2560
+EXPORT_TRACEPOINT_SYMBOL_GPL(cpu_frequency_limits);
23352561 
23362562 /**
2337
- *	cpufreq_update_policy - re-evaluate an existing cpufreq policy
2338
- *	@cpu: CPU which shall be re-evaluated
2563
+ * cpufreq_update_policy - Re-evaluate an existing cpufreq policy.
2564
+ * @cpu: CPU to re-evaluate the policy for.
23392565  *
2340
- *	Useful for policy notifiers which have different necessities
2341
- *	at different times.
2566
+ * Update the current frequency for the cpufreq policy of @cpu and use
2567
+ * cpufreq_set_policy() to re-apply the min and max limits, which triggers the
2568
+ * evaluation of policy notifiers and the cpufreq driver's ->verify() callback
2569
+ * for the policy in question, among other things.
23422570  */
23432571 void cpufreq_update_policy(unsigned int cpu)
23442572 {
2345
-	struct cpufreq_policy *policy = cpufreq_cpu_get(cpu);
2346
-	struct cpufreq_policy new_policy;
2573
+	struct cpufreq_policy *policy = cpufreq_cpu_acquire(cpu);
23472574 
23482575 	if (!policy)
23492576 		return;
2350
-
2351
-	down_write(&policy->rwsem);
2352
-
2353
-	if (policy_is_inactive(policy))
2354
-		goto unlock;
2355
-
2356
-	pr_debug("updating policy for CPU %u\n", cpu);
2357
-	memcpy(&new_policy, policy, sizeof(*policy));
2358
-	new_policy.min = policy->user_policy.min;
2359
-	new_policy.max = policy->user_policy.max;
23602577 
23612578 	/*
23622579 	 * BIOS might change freq behind our back
23632580 	 * -> ask driver for current freq and notify governors about a change
23642581 	 */
2365
-	if (cpufreq_driver->get && !cpufreq_driver->setpolicy) {
2366
-		if (cpufreq_suspended)
2367
-			goto unlock;
2582
+	if (cpufreq_driver->get && has_target() &&
2583
+	    (cpufreq_suspended || WARN_ON(!cpufreq_verify_current_freq(policy, false))))
2584
+		goto unlock;
23682585 
2369
-		new_policy.cur = cpufreq_update_current_freq(policy);
2370
-		if (WARN_ON(!new_policy.cur))
2371
-			goto unlock;
2372
-	}
2373
-
2374
-	cpufreq_set_policy(policy, &new_policy);
2586
+	refresh_frequency_limits(policy);
23752587 
23762588 unlock:
2377
-	up_write(&policy->rwsem);
2378
-
2379
-	cpufreq_cpu_put(policy);
2589
+	cpufreq_cpu_release(policy);
23802590 }
23812591 EXPORT_SYMBOL(cpufreq_update_policy);
2592
+
2593
+/**
2594
+ * cpufreq_update_limits - Update policy limits for a given CPU.
2595
+ * @cpu: CPU to update the policy limits for.
2596
+ *
2597
+ * Invoke the driver's ->update_limits callback if present or call
2598
+ * cpufreq_update_policy() for @cpu.
2599
+ */
2600
+void cpufreq_update_limits(unsigned int cpu)
2601
+{
2602
+	if (cpufreq_driver->update_limits)
2603
+		cpufreq_driver->update_limits(cpu);
2604
+	else
2605
+		cpufreq_update_policy(cpu);
2606
+}
2607
+EXPORT_SYMBOL_GPL(cpufreq_update_limits);
23822608 
23832609 /*********************************************************************
23842610  *               BOOST						     *
23852611  *********************************************************************/
2386
-static int cpufreq_boost_set_sw(int state)
2612
+static int cpufreq_boost_set_sw(struct cpufreq_policy *policy, int state)
23872613 {
2388
-	struct cpufreq_policy *policy;
2389
-	int ret = -EINVAL;
2614
+	int ret;
23902615 
2391
-	for_each_active_policy(policy) {
2392
-		if (!policy->freq_table)
2393
-			continue;
2616
+	if (!policy->freq_table)
2617
+		return -ENXIO;
23942618 
2395
-		ret = cpufreq_frequency_table_cpuinfo(policy,
2396
-						      policy->freq_table);
2397
-		if (ret) {
2398
-			pr_err("%s: Policy frequency update failed\n",
2399
-			       __func__);
2400
-			break;
2401
-		}
2402
-
2403
-		down_write(&policy->rwsem);
2404
-		policy->user_policy.max = policy->max;
2405
-		cpufreq_governor_limits(policy);
2406
-		up_write(&policy->rwsem);
2619
+	ret = cpufreq_frequency_table_cpuinfo(policy, policy->freq_table);
2620
+	if (ret) {
2621
+		pr_err("%s: Policy frequency update failed\n", __func__);
2622
+		return ret;
24072623 	}
24082624 
2409
-	return ret;
2625
+	ret = freq_qos_update_request(policy->max_freq_req, policy->max);
2626
+	if (ret < 0)
2627
+		return ret;
2628
+
2629
+	return 0;
24102630 }
24112631 
24122632 int cpufreq_boost_trigger_state(int state)
24132633 {
2634
+	struct cpufreq_policy *policy;
24142635 	unsigned long flags;
24152636 	int ret = 0;
24162637 
....@@ -2421,22 +2642,32 @@
24212642 	cpufreq_driver->boost_enabled = state;
24222643 	write_unlock_irqrestore(&cpufreq_driver_lock, flags);
24232644 
2424
-	ret = cpufreq_driver->set_boost(state);
2425
-	if (ret) {
2426
-		write_lock_irqsave(&cpufreq_driver_lock, flags);
2427
-		cpufreq_driver->boost_enabled = !state;
2428
-		write_unlock_irqrestore(&cpufreq_driver_lock, flags);
2429
-
2430
-		pr_err("%s: Cannot %s BOOST\n",
2431
-		       __func__, state ? "enable" : "disable");
2645
+	get_online_cpus();
2646
+	for_each_active_policy(policy) {
2647
+		ret = cpufreq_driver->set_boost(policy, state);
2648
+		if (ret)
2649
+			goto err_reset_state;
24322650 	}
2651
+	put_online_cpus();
2652
+
2653
+	return 0;
2654
+
2655
+err_reset_state:
2656
+	put_online_cpus();
2657
+
2658
+	write_lock_irqsave(&cpufreq_driver_lock, flags);
2659
+	cpufreq_driver->boost_enabled = !state;
2660
+	write_unlock_irqrestore(&cpufreq_driver_lock, flags);
2661
+
2662
+	pr_err("%s: Cannot %s BOOST\n",
2663
+	       __func__, state ? "enable" : "disable");
24332664 
24342665 	return ret;
24352666 }
24362667 
24372668 static bool cpufreq_boost_supported(void)
24382669 {
2439
-	return likely(cpufreq_driver) && cpufreq_driver->set_boost;
2670
+	return cpufreq_driver->set_boost;
24402671 }
24412672 
24422673 static int create_boost_sysfs_file(void)
....@@ -2527,7 +2758,8 @@
25272758 		    driver_data->target) ||
25282759 	     (driver_data->setpolicy && (driver_data->target_index ||
25292760 		    driver_data->target)) ||
2530
-	     (!!driver_data->get_intermediate != !!driver_data->target_intermediate))
2761
+	     (!driver_data->get_intermediate != !driver_data->target_intermediate) ||
2762
+	     (!driver_data->online != !driver_data->offline))
25312763 		return -EINVAL;
25322764 
25332765 	pr_debug("trying to register driver %s\n", driver_data->name);
....@@ -2543,6 +2775,15 @@
25432775 	}
25442776 	cpufreq_driver = driver_data;
25452777 	write_unlock_irqrestore(&cpufreq_driver_lock, flags);
2778
+
2779
+	/*
2780
+	 * Mark support for the scheduler's frequency invariance engine for
2781
+	 * drivers that implement target(), target_index() or fast_switch().
2782
+	 */
2783
+	if (!cpufreq_driver->setpolicy) {
2784
+		static_branch_enable_cpuslocked(&cpufreq_freq_invariance);
2785
+		pr_debug("supports frequency invariance");
2786
+	}
25462787 
25472788 	if (driver_data->setpolicy)
25482789 		driver_data->flags |= CPUFREQ_CONST_LOOPS;
....@@ -2592,7 +2833,7 @@
25922833 }
25932834 EXPORT_SYMBOL_GPL(cpufreq_register_driver);
25942835 
2595
-/**
2836
+/*
25962837  * cpufreq_unregister_driver - unregister the current CPUFreq driver
25972838  *
25982839  * Unregister the current CPUFreq driver. Only call this if you have
....@@ -2613,6 +2854,7 @@
26132854 	cpus_read_lock();
26142855 	subsys_interface_unregister(&cpufreq_interface);
26152856 	remove_boost_sysfs_file();
2857
+	static_branch_disable_cpuslocked(&cpufreq_freq_invariance);
26162858 	cpuhp_remove_state_nocalls_cpuslocked(hp_online);
26172859 
26182860 	write_lock_irqsave(&cpufreq_driver_lock, flags);
....@@ -2626,18 +2868,21 @@
26262868 }
26272869 EXPORT_SYMBOL_GPL(cpufreq_unregister_driver);
26282870 
2629
-struct kobject *cpufreq_global_kobject;
2630
-EXPORT_SYMBOL(cpufreq_global_kobject);
2631
-
26322871 static int __init cpufreq_core_init(void)
26332872 {
2873
+	struct cpufreq_governor *gov = cpufreq_default_governor();
2874
+
26342875 	if (cpufreq_disabled())
26352876 		return -ENODEV;
26362877 
26372878 	cpufreq_global_kobject = kobject_create_and_add("cpufreq", &cpu_subsys.dev_root->kobj);
26382879 	BUG_ON(!cpufreq_global_kobject);
26392880 
2881
+	if (!strlen(default_governor))
2882
+		strncpy(default_governor, gov->name, CPUFREQ_NAME_LEN);
2883
+
26402884 	return 0;
26412885 }
26422886 module_param(off, int, 0444);
2887
+module_param_string(default_governor, default_governor, CPUFREQ_NAME_LEN, 0444);
26432888 core_initcall(cpufreq_core_init);