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2023-12-11 d2ccde1c8e90d38cee87a1b0309ad2827f3fd30d 
 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 
....@@ -416,10 +445,14 @@
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);
452
+
453
+	arch_set_freq_scale(policy->related_cpus,
454
+			    policy->cur,
455
+			    policy->cpuinfo.max_freq);
423456 
424457 	policy->transition_ongoing = false;
425458 	policy->transition_task = NULL;
....@@ -444,7 +477,7 @@
444477 	mutex_lock(&cpufreq_transition_notifier_list.mutex);
445478 
446479 	for (nb = cpufreq_transition_notifier_list.head; nb; nb = nb->next)
447
-		pr_info("%pF\n", nb->notifier_call);
480
+		pr_info("%pS\n", nb->notifier_call);
448481 
449482 	mutex_unlock(&cpufreq_transition_notifier_list.mutex);
450483 }
....@@ -499,6 +532,7 @@
499532 /**
500533  * cpufreq_driver_resolve_freq - Map a target frequency to a driver-supported
501534  * one.
535
+ * @policy: associated policy to interrogate
502536  * @target_freq: target frequency to resolve.
503537  *
504538  * The target to driver frequency mapping is cached in the policy.
....@@ -509,11 +543,14 @@
509543 unsigned int cpufreq_driver_resolve_freq(struct cpufreq_policy *policy,
510544 					 unsigned int target_freq)
511545 {
546
+	unsigned int old_target_freq = target_freq;
547
+
512548 	target_freq = clamp_val(target_freq, policy->min, policy->max);
549
+	trace_android_vh_cpufreq_resolve_freq(policy, target_freq, old_target_freq);
513550 	policy->cached_target_freq = target_freq;
514551 
515552 	if (cpufreq_driver->target_index) {
516
-		int idx;
553
+		unsigned int idx;
517554 
518555 		idx = cpufreq_frequency_table_target(policy, target_freq,
519556 						     CPUFREQ_RELATION_L);
....@@ -596,56 +633,54 @@
596633 	return NULL;
597634 }
598635 
599
-/**
600
- * cpufreq_parse_governor - parse a governor string
601
- */
602
-static int cpufreq_parse_governor(char *str_governor,
603
-				  struct cpufreq_policy *policy)
636
+static struct cpufreq_governor *get_governor(const char *str_governor)
604637 {
605
-	if (cpufreq_driver->setpolicy) {
606
-		if (!strncasecmp(str_governor, "performance", CPUFREQ_NAME_LEN)) {
607
-			policy->policy = CPUFREQ_POLICY_PERFORMANCE;
608
-			return 0;
609
-		}
638
+	struct cpufreq_governor *t;
610639 
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;
640
+	mutex_lock(&cpufreq_governor_mutex);
641
+	t = find_governor(str_governor);
642
+	if (!t)
643
+		goto unlock;
617644 
618
-		mutex_lock(&cpufreq_governor_mutex);
645
+	if (!try_module_get(t->owner))
646
+		t = NULL;
619647 
620
-		t = find_governor(str_governor);
621
-		if (!t) {
622
-			int ret;
648
+unlock:
649
+	mutex_unlock(&cpufreq_governor_mutex);
623650 
624
-			mutex_unlock(&cpufreq_governor_mutex);
651
+	return t;
652
+}
625653 
626
-			ret = request_module("cpufreq_%s", str_governor);
627
-			if (ret)
628
-				return -EINVAL;
654
+static unsigned int cpufreq_parse_policy(char *str_governor)
655
+{
656
+	if (!strncasecmp(str_governor, "performance", CPUFREQ_NAME_LEN))
657
+		return CPUFREQ_POLICY_PERFORMANCE;
629658 
630
-			mutex_lock(&cpufreq_governor_mutex);
659
+	if (!strncasecmp(str_governor, "powersave", CPUFREQ_NAME_LEN))
660
+		return CPUFREQ_POLICY_POWERSAVE;
631661 
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;
662
+	return CPUFREQ_POLICY_UNKNOWN;
646663 }
647664 
648665 /**
666
+ * cpufreq_parse_governor - parse a governor string only for has_target()
667
+ * @str_governor: Governor name.
668
+ */
669
+static struct cpufreq_governor *cpufreq_parse_governor(char *str_governor)
670
+{
671
+	struct cpufreq_governor *t;
672
+
673
+	t = get_governor(str_governor);
674
+	if (t)
675
+		return t;
676
+
677
+	if (request_module("cpufreq_%s", str_governor))
678
+		return NULL;
679
+
680
+	return get_governor(str_governor);
681
+}
682
+
683
+/*
649684  * cpufreq_per_cpu_attr_read() / show_##file_name() -
650685  * print out cpufreq information
651686  *
....@@ -660,8 +695,16 @@
660695 	return sprintf(buf, "%u\n", policy->object);	\
661696 }
662697 
698
+static ssize_t show_cpuinfo_max_freq(struct cpufreq_policy *policy, char *buf)
699
+{
700
+	unsigned int max_freq = policy->cpuinfo.max_freq;
701
+
702
+	trace_android_vh_show_max_freq(policy, &max_freq);
703
+	trace_android_rvh_show_max_freq(policy, &max_freq);
704
+	return sprintf(buf, "%u\n", max_freq);
705
+}
706
+
663707 show_one(cpuinfo_min_freq, cpuinfo.min_freq);
664
-show_one(cpuinfo_max_freq, cpuinfo.max_freq);
665708 show_one(cpuinfo_transition_latency, cpuinfo.transition_latency);
666709 show_one(scaling_min_freq, min);
667710 show_one(scaling_max_freq, max);
....@@ -679,47 +722,35 @@
679722 	freq = arch_freq_get_on_cpu(policy->cpu);
680723 	if (freq)
681724 		ret = sprintf(buf, "%u\n", freq);
682
-	else if (cpufreq_driver && cpufreq_driver->setpolicy &&
683
-			cpufreq_driver->get)
725
+	else if (cpufreq_driver->setpolicy && cpufreq_driver->get)
684726 		ret = sprintf(buf, "%u\n", cpufreq_driver->get(policy->cpu));
685727 	else
686728 		ret = sprintf(buf, "%u\n", policy->cur);
687729 	return ret;
688730 }
689731 
690
-static int cpufreq_set_policy(struct cpufreq_policy *policy,
691
-				struct cpufreq_policy *new_policy);
692
-
693
-/**
732
+/*
694733  * cpufreq_per_cpu_attr_write() / store_##file_name() - sysfs write access
695734  */
696735 #define store_one(file_name, object)			\
697736 static ssize_t store_##file_name					\
698737 (struct cpufreq_policy *policy, const char *buf, size_t count)		\
699738 {									\
700
-	int ret, temp;							\
701
-	struct cpufreq_policy new_policy;				\
739
+	unsigned long val;						\
740
+	int ret;							\
702741 									\
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);			\
742
+	ret = sscanf(buf, "%lu", &val);					\
708743 	if (ret != 1)							\
709744 		return -EINVAL;						\
710745 									\
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;					\
746
+	ret = freq_qos_update_request(policy->object##_freq_req, val);\
747
+	return ret >= 0 ? count : ret;					\
717748 }
718749 
719750 store_one(scaling_min_freq, min);
720751 store_one(scaling_max_freq, max);
721752 
722
-/**
753
+/*
723754  * show_cpuinfo_cur_freq - current CPU frequency as detected by hardware
724755  */
725756 static ssize_t show_cpuinfo_cur_freq(struct cpufreq_policy *policy,
....@@ -733,7 +764,7 @@
733764 	return sprintf(buf, "<unknown>\n");
734765 }
735766 
736
-/**
767
+/*
737768  * show_scaling_governor - show the current policy for the specified CPU
738769  */
739770 static ssize_t show_scaling_governor(struct cpufreq_policy *policy, char *buf)
....@@ -748,34 +779,44 @@
748779 	return -EINVAL;
749780 }
750781 
751
-/**
782
+/*
752783  * store_scaling_governor - store policy for the specified CPU
753784  */
754785 static ssize_t store_scaling_governor(struct cpufreq_policy *policy,
755786 					const char *buf, size_t count)
756787 {
788
+	char str_governor[16];
757789 	int ret;
758
-	char	str_governor[16];
759
-	struct cpufreq_policy new_policy;
760
-
761
-	memcpy(&new_policy, policy, sizeof(*policy));
762790 
763791 	ret = sscanf(buf, "%15s", str_governor);
764792 	if (ret != 1)
765793 		return -EINVAL;
766794 
767
-	if (cpufreq_parse_governor(str_governor, &new_policy))
768
-		return -EINVAL;
795
+	if (cpufreq_driver->setpolicy) {
796
+		unsigned int new_pol;
769797 
770
-	ret = cpufreq_set_policy(policy, &new_policy);
798
+		new_pol = cpufreq_parse_policy(str_governor);
799
+		if (!new_pol)
800
+			return -EINVAL;
771801 
772
-	if (new_policy.governor)
773
-		module_put(new_policy.governor->owner);
802
+		ret = cpufreq_set_policy(policy, NULL, new_pol);
803
+	} else {
804
+		struct cpufreq_governor *new_gov;
805
+
806
+		new_gov = cpufreq_parse_governor(str_governor);
807
+		if (!new_gov)
808
+			return -EINVAL;
809
+
810
+		ret = cpufreq_set_policy(policy, new_gov,
811
+					 CPUFREQ_POLICY_UNKNOWN);
812
+
813
+		module_put(new_gov->owner);
814
+	}
774815 
775816 	return ret ? ret : count;
776817 }
777818 
778
-/**
819
+/*
779820  * show_scaling_driver - show the cpufreq driver currently loaded
780821  */
781822 static ssize_t show_scaling_driver(struct cpufreq_policy *policy, char *buf)
....@@ -783,7 +824,7 @@
783824 	return scnprintf(buf, CPUFREQ_NAME_PLEN, "%s\n", cpufreq_driver->name);
784825 }
785826 
786
-/**
827
+/*
787828  * show_scaling_available_governors - show the available CPUfreq governors
788829  */
789830 static ssize_t show_scaling_available_governors(struct cpufreq_policy *policy,
....@@ -797,12 +838,14 @@
797838 		goto out;
798839 	}
799840 
841
+	mutex_lock(&cpufreq_governor_mutex);
800842 	for_each_governor(t) {
801843 		if (i >= (ssize_t) ((PAGE_SIZE / sizeof(char))
802844 		    - (CPUFREQ_NAME_LEN + 2)))
803
-			goto out;
845
+			break;
804846 		i += scnprintf(&buf[i], CPUFREQ_NAME_PLEN, "%s ", t->name);
805847 	}
848
+	mutex_unlock(&cpufreq_governor_mutex);
806849 out:
807850 	i += sprintf(&buf[i], "\n");
808851 	return i;
....@@ -825,7 +868,7 @@
825868 }
826869 EXPORT_SYMBOL_GPL(cpufreq_show_cpus);
827870 
828
-/**
871
+/*
829872  * show_related_cpus - show the CPUs affected by each transition even if
830873  * hw coordination is in use
831874  */
....@@ -834,7 +877,7 @@
834877 	return cpufreq_show_cpus(policy->related_cpus, buf);
835878 }
836879 
837
-/**
880
+/*
838881  * show_affected_cpus - show the CPUs affected by each transition
839882  */
840883 static ssize_t show_affected_cpus(struct cpufreq_policy *policy, char *buf)
....@@ -868,18 +911,16 @@
868911 	return policy->governor->show_setspeed(policy, buf);
869912 }
870913 
871
-/**
914
+/*
872915  * show_bios_limit - show the current cpufreq HW/BIOS limitation
873916  */
874917 static ssize_t show_bios_limit(struct cpufreq_policy *policy, char *buf)
875918 {
876919 	unsigned int limit;
877920 	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
-	}
921
+	ret = cpufreq_driver->bios_limit(policy->cpu, &limit);
922
+	if (!ret)
923
+		return sprintf(buf, "%u\n", limit);
883924 	return sprintf(buf, "%u\n", policy->cpuinfo.max_freq);
884925 }
885926 
....@@ -978,11 +1019,10 @@
9781019 	.release	= cpufreq_sysfs_release,
9791020 };
9801021 
981
-static void add_cpu_dev_symlink(struct cpufreq_policy *policy, unsigned int cpu)
1022
+static void add_cpu_dev_symlink(struct cpufreq_policy *policy, unsigned int cpu,
1023
+				struct device *dev)
9821024 {
983
-	struct device *dev = get_cpu_device(cpu);
984
-
985
-	if (!dev)
1025
+	if (unlikely(!dev))
9861026 		return;
9871027 
9881028 	if (cpumask_test_and_set_cpu(cpu, policy->real_cpus))
....@@ -1032,40 +1072,52 @@
10321072 	return 0;
10331073 }
10341074 
1035
-__weak struct cpufreq_governor *cpufreq_default_governor(void)
1036
-{
1037
-	return NULL;
1038
-}
1039
-
10401075 static int cpufreq_init_policy(struct cpufreq_policy *policy)
10411076 {
10421077 	struct cpufreq_governor *gov = NULL;
1043
-	struct cpufreq_policy new_policy;
1078
+	unsigned int pol = CPUFREQ_POLICY_UNKNOWN;
1079
+	int ret;
10441080 
1045
-	memcpy(&new_policy, policy, sizeof(*policy));
1081
+	if (has_target()) {
1082
+		/* Update policy governor to the one used before hotplug. */
1083
+		gov = get_governor(policy->last_governor);
1084
+		if (gov) {
1085
+			pr_debug("Restoring governor %s for cpu %d\n",
1086
+				 gov->name, policy->cpu);
1087
+		} else {
1088
+			gov = get_governor(default_governor);
1089
+		}
10461090 
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);
1091
+		if (!gov) {
1092
+			gov = cpufreq_default_governor();
1093
+			__module_get(gov->owner);
1094
+		}
1095
+
10521096 	} else {
1053
-		gov = cpufreq_default_governor();
1054
-		if (!gov)
1097
+
1098
+		/* Use the default policy if there is no last_policy. */
1099
+		if (policy->last_policy) {
1100
+			pol = policy->last_policy;
1101
+		} else {
1102
+			pol = cpufreq_parse_policy(default_governor);
1103
+			/*
1104
+			 * In case the default governor is neither "performance"
1105
+			 * nor "powersave", fall back to the initial policy
1106
+			 * value set by the driver.
1107
+			 */
1108
+			if (pol == CPUFREQ_POLICY_UNKNOWN)
1109
+				pol = policy->policy;
1110
+		}
1111
+		if (pol != CPUFREQ_POLICY_PERFORMANCE &&
1112
+		    pol != CPUFREQ_POLICY_POWERSAVE)
10551113 			return -ENODATA;
10561114 	}
10571115 
1058
-	new_policy.governor = gov;
1116
+	ret = cpufreq_set_policy(policy, gov, pol);
1117
+	if (gov)
1118
+		module_put(gov->owner);
10591119 
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);
1120
+	return ret;
10691121 }
10701122 
10711123 static int cpufreq_add_policy_cpu(struct cpufreq_policy *policy, unsigned int cpu)
....@@ -1091,61 +1143,43 @@
10911143 	return ret;
10921144 }
10931145 
1146
+void refresh_frequency_limits(struct cpufreq_policy *policy)
1147
+{
1148
+	if (!policy_is_inactive(policy)) {
1149
+		pr_debug("updating policy for CPU %u\n", policy->cpu);
1150
+
1151
+		cpufreq_set_policy(policy, policy->governor, policy->policy);
1152
+	}
1153
+}
1154
+EXPORT_SYMBOL(refresh_frequency_limits);
1155
+
10941156 static void handle_update(struct work_struct *work)
10951157 {
10961158 	struct cpufreq_policy *policy =
10971159 		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);
1160
+
1161
+	pr_debug("handle_update for cpu %u called\n", policy->cpu);
1162
+	down_write(&policy->rwsem);
1163
+	refresh_frequency_limits(policy);
1164
+	up_write(&policy->rwsem);
11011165 }
11021166 
1103
-static struct cpufreq_policy *cpufreq_policy_alloc(unsigned int cpu)
1167
+static int cpufreq_notifier_min(struct notifier_block *nb, unsigned long freq,
1168
+				void *data)
11041169 {
1105
-	struct cpufreq_policy *policy;
1106
-	int ret;
1170
+	struct cpufreq_policy *policy = container_of(nb, struct cpufreq_policy, nb_min);
11071171 
1108
-	policy = kzalloc(sizeof(*policy), GFP_KERNEL);
1109
-	if (!policy)
1110
-		return NULL;
1172
+	schedule_work(&policy->update);
1173
+	return 0;
1174
+}
11111175 
1112
-	if (!alloc_cpumask_var(&policy->cpus, GFP_KERNEL))
1113
-		goto err_free_policy;
1176
+static int cpufreq_notifier_max(struct notifier_block *nb, unsigned long freq,
1177
+				void *data)
1178
+{
1179
+	struct cpufreq_policy *policy = container_of(nb, struct cpufreq_policy, nb_max);
11141180 
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;
1181
+	schedule_work(&policy->update);
1182
+	return 0;
11491183 }
11501184 
11511185 static void cpufreq_policy_put_kobj(struct cpufreq_policy *policy)
....@@ -1170,6 +1204,89 @@
11701204 	pr_debug("wait complete\n");
11711205 }
11721206 
1207
+static struct cpufreq_policy *cpufreq_policy_alloc(unsigned int cpu)
1208
+{
1209
+	struct cpufreq_policy *policy;
1210
+	struct device *dev = get_cpu_device(cpu);
1211
+	int ret;
1212
+
1213
+	if (!dev)
1214
+		return NULL;
1215
+
1216
+	policy = kzalloc(sizeof(*policy), GFP_KERNEL);
1217
+	if (!policy)
1218
+		return NULL;
1219
+
1220
+	if (!alloc_cpumask_var(&policy->cpus, GFP_KERNEL))
1221
+		goto err_free_policy;
1222
+
1223
+	if (!zalloc_cpumask_var(&policy->related_cpus, GFP_KERNEL))
1224
+		goto err_free_cpumask;
1225
+
1226
+	if (!zalloc_cpumask_var(&policy->real_cpus, GFP_KERNEL))
1227
+		goto err_free_rcpumask;
1228
+
1229
+	ret = kobject_init_and_add(&policy->kobj, &ktype_cpufreq,
1230
+				   cpufreq_global_kobject, "policy%u", cpu);
1231
+	if (ret) {
1232
+		dev_err(dev, "%s: failed to init policy->kobj: %d\n", __func__, ret);
1233
+		/*
1234
+		 * The entire policy object will be freed below, but the extra
1235
+		 * memory allocated for the kobject name needs to be freed by
1236
+		 * releasing the kobject.
1237
+		 */
1238
+		kobject_put(&policy->kobj);
1239
+		goto err_free_real_cpus;
1240
+	}
1241
+
1242
+	freq_constraints_init(&policy->constraints);
1243
+
1244
+	policy->nb_min.notifier_call = cpufreq_notifier_min;
1245
+	policy->nb_max.notifier_call = cpufreq_notifier_max;
1246
+
1247
+	ret = freq_qos_add_notifier(&policy->constraints, FREQ_QOS_MIN,
1248
+				    &policy->nb_min);
1249
+	if (ret) {
1250
+		dev_err(dev, "Failed to register MIN QoS notifier: %d (%*pbl)\n",
1251
+			ret, cpumask_pr_args(policy->cpus));
1252
+		goto err_kobj_remove;
1253
+	}
1254
+
1255
+	ret = freq_qos_add_notifier(&policy->constraints, FREQ_QOS_MAX,
1256
+				    &policy->nb_max);
1257
+	if (ret) {
1258
+		dev_err(dev, "Failed to register MAX QoS notifier: %d (%*pbl)\n",
1259
+			ret, cpumask_pr_args(policy->cpus));
1260
+		goto err_min_qos_notifier;
1261
+	}
1262
+
1263
+	INIT_LIST_HEAD(&policy->policy_list);
1264
+	init_rwsem(&policy->rwsem);
1265
+	spin_lock_init(&policy->transition_lock);
1266
+	init_waitqueue_head(&policy->transition_wait);
1267
+	init_completion(&policy->kobj_unregister);
1268
+	INIT_WORK(&policy->update, handle_update);
1269
+
1270
+	policy->cpu = cpu;
1271
+	return policy;
1272
+
1273
+err_min_qos_notifier:
1274
+	freq_qos_remove_notifier(&policy->constraints, FREQ_QOS_MIN,
1275
+				 &policy->nb_min);
1276
+err_kobj_remove:
1277
+	cpufreq_policy_put_kobj(policy);
1278
+err_free_real_cpus:
1279
+	free_cpumask_var(policy->real_cpus);
1280
+err_free_rcpumask:
1281
+	free_cpumask_var(policy->related_cpus);
1282
+err_free_cpumask:
1283
+	free_cpumask_var(policy->cpus);
1284
+err_free_policy:
1285
+	kfree(policy);
1286
+
1287
+	return NULL;
1288
+}
1289
+
11731290 static void cpufreq_policy_free(struct cpufreq_policy *policy)
11741291 {
11751292 	unsigned long flags;
....@@ -1182,6 +1299,27 @@
11821299 	for_each_cpu(cpu, policy->related_cpus)
11831300 		per_cpu(cpufreq_cpu_data, cpu) = NULL;
11841301 	write_unlock_irqrestore(&cpufreq_driver_lock, flags);
1302
+
1303
+	freq_qos_remove_notifier(&policy->constraints, FREQ_QOS_MAX,
1304
+				 &policy->nb_max);
1305
+	freq_qos_remove_notifier(&policy->constraints, FREQ_QOS_MIN,
1306
+				 &policy->nb_min);
1307
+
1308
+	/* Cancel any pending policy->update work before freeing the policy. */
1309
+	cancel_work_sync(&policy->update);
1310
+
1311
+	if (policy->max_freq_req) {
1312
+		/*
1313
+		 * CPUFREQ_CREATE_POLICY notification is sent only after
1314
+		 * successfully adding max_freq_req request.
1315
+		 */
1316
+		blocking_notifier_call_chain(&cpufreq_policy_notifier_list,
1317
+					     CPUFREQ_REMOVE_POLICY, policy);
1318
+		freq_qos_remove_request(policy->max_freq_req);
1319
+	}
1320
+
1321
+	freq_qos_remove_request(policy->min_freq_req);
1322
+	kfree(policy->min_freq_req);
11851323 
11861324 	cpufreq_policy_put_kobj(policy);
11871325 	free_cpumask_var(policy->real_cpus);
....@@ -1220,28 +1358,44 @@
12201358 			return -ENOMEM;
12211359 	}
12221360 
1223
-	cpumask_copy(policy->cpus, cpumask_of(cpu));
1361
+	if (!new_policy && cpufreq_driver->online) {
1362
+		ret = cpufreq_driver->online(policy);
1363
+		if (ret) {
1364
+			pr_debug("%s: %d: initialization failed\n", __func__,
1365
+				 __LINE__);
1366
+			goto out_exit_policy;
1367
+		}
12241368 
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
-	}
1369
+		/* Recover policy->cpus using related_cpus */
1370
+		cpumask_copy(policy->cpus, policy->related_cpus);
1371
+	} else {
1372
+		cpumask_copy(policy->cpus, cpumask_of(cpu));
12331373 
1234
-	ret = cpufreq_table_validate_and_sort(policy);
1235
-	if (ret)
1236
-		goto out_exit_policy;
1374
+		/*
1375
+		 * Call driver. From then on the cpufreq must be able
1376
+		 * to accept all calls to ->verify and ->setpolicy for this CPU.
1377
+		 */
1378
+		ret = cpufreq_driver->init(policy);
1379
+		if (ret) {
1380
+			pr_debug("%s: %d: initialization failed\n", __func__,
1381
+				 __LINE__);
1382
+			goto out_free_policy;
1383
+		}
12371384 
1238
-	down_write(&policy->rwsem);
1385
+		/*
1386
+		 * The initialization has succeeded and the policy is online.
1387
+		 * If there is a problem with its frequency table, take it
1388
+		 * offline and drop it.
1389
+		 */
1390
+		ret = cpufreq_table_validate_and_sort(policy);
1391
+		if (ret)
1392
+			goto out_offline_policy;
12391393 
1240
-	if (new_policy) {
12411394 		/* related_cpus should at least include policy->cpus. */
12421395 		cpumask_copy(policy->related_cpus, policy->cpus);
12431396 	}
12441397 
1398
+	down_write(&policy->rwsem);
12451399 	/*
12461400 	 * affected cpus must always be the one, which are online. We aren't
12471401 	 * managing offline cpus here.
....@@ -1249,19 +1403,49 @@
12491403 	cpumask_and(policy->cpus, policy->cpus, cpu_online_mask);
12501404 
12511405 	if (new_policy) {
1252
-		policy->user_policy.min = policy->min;
1253
-		policy->user_policy.max = policy->max;
1254
-
12551406 		for_each_cpu(j, policy->related_cpus) {
12561407 			per_cpu(cpufreq_cpu_data, j) = policy;
1257
-			add_cpu_dev_symlink(policy, j);
1408
+			add_cpu_dev_symlink(policy, j, get_cpu_device(j));
12581409 		}
1259
-	} else {
1260
-		policy->min = policy->user_policy.min;
1261
-		policy->max = policy->user_policy.max;
1410
+
1411
+		policy->min_freq_req = kzalloc(2 * sizeof(*policy->min_freq_req),
1412
+					       GFP_KERNEL);
1413
+		if (!policy->min_freq_req)
1414
+			goto out_destroy_policy;
1415
+
1416
+		ret = freq_qos_add_request(&policy->constraints,
1417
+					   policy->min_freq_req, FREQ_QOS_MIN,
1418
+					   FREQ_QOS_MIN_DEFAULT_VALUE);
1419
+		if (ret < 0) {
1420
+			/*
1421
+			 * So we don't call freq_qos_remove_request() for an
1422
+			 * uninitialized request.
1423
+			 */
1424
+			kfree(policy->min_freq_req);
1425
+			policy->min_freq_req = NULL;
1426
+			goto out_destroy_policy;
1427
+		}
1428
+
1429
+		/*
1430
+		 * This must be initialized right here to avoid calling
1431
+		 * freq_qos_remove_request() on uninitialized request in case
1432
+		 * of errors.
1433
+		 */
1434
+		policy->max_freq_req = policy->min_freq_req + 1;
1435
+
1436
+		ret = freq_qos_add_request(&policy->constraints,
1437
+					   policy->max_freq_req, FREQ_QOS_MAX,
1438
+					   FREQ_QOS_MAX_DEFAULT_VALUE);
1439
+		if (ret < 0) {
1440
+			policy->max_freq_req = NULL;
1441
+			goto out_destroy_policy;
1442
+		}
1443
+
1444
+		blocking_notifier_call_chain(&cpufreq_policy_notifier_list,
1445
+				CPUFREQ_CREATE_POLICY, policy);
12621446 	}
12631447 
1264
-	if (cpufreq_driver->get && !cpufreq_driver->setpolicy) {
1448
+	if (cpufreq_driver->get && has_target()) {
12651449 		policy->cur = cpufreq_driver->get(policy->cpu);
12661450 		if (!policy->cur) {
12671451 			pr_err("%s: ->get() failed\n", __func__);
....@@ -1289,14 +1473,13 @@
12891473 	 */
12901474 	if ((cpufreq_driver->flags & CPUFREQ_NEED_INITIAL_FREQ_CHECK)
12911475 	    && has_target()) {
1476
+		unsigned int old_freq = policy->cur;
1477
+
12921478 		/* Are we running at unknown frequency ? */
1293
-		ret = cpufreq_frequency_table_get_index(policy, policy->cur);
1479
+		ret = cpufreq_frequency_table_get_index(policy, old_freq);
12941480 		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);
1481
+			ret = __cpufreq_driver_target(policy, old_freq - 1,
1482
+						      CPUFREQ_RELATION_L);
13001483 
13011484 			/*
13021485 			 * Reaching here after boot in a few seconds may not
....@@ -1304,8 +1487,8 @@
13041487 			 * frequency for longer duration. Hence, a BUG_ON().
13051488 			 */
13061489 			BUG_ON(ret);
1307
-			pr_warn("%s: CPU%d: Unlisted initial frequency changed to: %u KHz\n",
1308
-				__func__, policy->cpu, policy->cur);
1490
+			pr_info("%s: CPU%d: Running at unlisted initial frequency: %u KHz, changing to: %u KHz\n",
1491
+				__func__, policy->cpu, old_freq, policy->cur);
13091492 		}
13101493 	}
13111494 
....@@ -1326,8 +1509,6 @@
13261509 	if (ret) {
13271510 		pr_err("%s: Failed to initialize policy for cpu: %d (%d)\n",
13281511 		       __func__, cpu, ret);
1329
-		/* cpufreq_policy_free() will notify based on this */
1330
-		new_policy = false;
13311512 		goto out_destroy_policy;
13321513 	}
13331514 
....@@ -1339,8 +1520,7 @@
13391520 	if (cpufreq_driver->ready)
13401521 		cpufreq_driver->ready(policy);
13411522 
1342
-	if (IS_ENABLED(CONFIG_CPU_THERMAL) &&
1343
-	    cpufreq_driver->flags & CPUFREQ_IS_COOLING_DEV)
1523
+	if (cpufreq_thermal_control_enabled(cpufreq_driver))
13441524 		policy->cdev = of_cpufreq_cooling_register(policy);
13451525 
13461526 	pr_debug("initialization complete\n");
....@@ -1352,6 +1532,10 @@
13521532 		remove_cpu_dev_symlink(policy, get_cpu_device(j));
13531533 
13541534 	up_write(&policy->rwsem);
1535
+
1536
+out_offline_policy:
1537
+	if (cpufreq_driver->offline)
1538
+		cpufreq_driver->offline(policy);
13551539 
13561540 out_exit_policy:
13571541 	if (cpufreq_driver->exit)
....@@ -1384,7 +1568,7 @@
13841568 	/* Create sysfs link on CPU registration */
13851569 	policy = per_cpu(cpufreq_cpu_data, cpu);
13861570 	if (policy)
1387
-		add_cpu_dev_symlink(policy, cpu);
1571
+		add_cpu_dev_symlink(policy, cpu, dev);
13881572 
13891573 	return 0;
13901574 }
....@@ -1430,8 +1614,7 @@
14301614 		goto unlock;
14311615 	}
14321616 
1433
-	if (IS_ENABLED(CONFIG_CPU_THERMAL) &&
1434
-	    cpufreq_driver->flags & CPUFREQ_IS_COOLING_DEV) {
1617
+	if (cpufreq_thermal_control_enabled(cpufreq_driver)) {
14351618 		cpufreq_cooling_unregister(policy->cdev);
14361619 		policy->cdev = NULL;
14371620 	}
....@@ -1443,11 +1626,12 @@
14431626 		cpufreq_exit_governor(policy);
14441627 
14451628 	/*
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.
1629
+	 * Perform the ->offline() during light-weight tear-down, as
1630
+	 * that allows fast recovery when the CPU comes back.
14491631 	 */
1450
-	if (cpufreq_driver->exit) {
1632
+	if (cpufreq_driver->offline) {
1633
+		cpufreq_driver->offline(policy);
1634
+	} else if (cpufreq_driver->exit) {
14511635 		cpufreq_driver->exit(policy);
14521636 		policy->freq_table = NULL;
14531637 	}
....@@ -1457,7 +1641,7 @@
14571641 	return 0;
14581642 }
14591643 
1460
-/**
1644
+/*
14611645  * cpufreq_remove_dev - remove a CPU device
14621646  *
14631647  * Removes the cpufreq interface for a CPU device.
....@@ -1476,8 +1660,13 @@
14761660 	cpumask_clear_cpu(cpu, policy->real_cpus);
14771661 	remove_cpu_dev_symlink(policy, dev);
14781662 
1479
-	if (cpumask_empty(policy->real_cpus))
1663
+	if (cpumask_empty(policy->real_cpus)) {
1664
+		/* We did light-weight exit earlier, do full tear down now */
1665
+		if (cpufreq_driver->offline)
1666
+			cpufreq_driver->exit(policy);
1667
+
14801668 		cpufreq_policy_free(policy);
1669
+	}
14811670 }
14821671 
14831672 /**
....@@ -1502,6 +1691,30 @@
15021691 
15031692 	cpufreq_freq_transition_begin(policy, &freqs);
15041693 	cpufreq_freq_transition_end(policy, &freqs, 0);
1694
+}
1695
+
1696
+static unsigned int cpufreq_verify_current_freq(struct cpufreq_policy *policy, bool update)
1697
+{
1698
+	unsigned int new_freq;
1699
+
1700
+	new_freq = cpufreq_driver->get(policy->cpu);
1701
+	if (!new_freq)
1702
+		return 0;
1703
+
1704
+	/*
1705
+	 * If fast frequency switching is used with the given policy, the check
1706
+	 * against policy->cur is pointless, so skip it in that case.
1707
+	 */
1708
+	if (policy->fast_switch_enabled || !has_target())
1709
+		return new_freq;
1710
+
1711
+	if (policy->cur != new_freq) {
1712
+		cpufreq_out_of_sync(policy, new_freq);
1713
+		if (update)
1714
+			schedule_work(&policy->update);
1715
+	}
1716
+
1717
+	return new_freq;
15051718 }
15061719 
15071720 /**
....@@ -1557,33 +1770,32 @@
15571770 }
15581771 EXPORT_SYMBOL(cpufreq_quick_get_max);
15591772 
1560
-static unsigned int __cpufreq_get(struct cpufreq_policy *policy)
1773
+/**
1774
+ * cpufreq_get_hw_max_freq - get the max hardware frequency of the CPU
1775
+ * @cpu: CPU number
1776
+ *
1777
+ * The default return value is the max_freq field of cpuinfo.
1778
+ */
1779
+__weak unsigned int cpufreq_get_hw_max_freq(unsigned int cpu)
15611780 {
1781
+	struct cpufreq_policy *policy = cpufreq_cpu_get(cpu);
15621782 	unsigned int ret_freq = 0;
15631783 
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
-		}
1784
+	if (policy) {
1785
+		ret_freq = policy->cpuinfo.max_freq;
1786
+		cpufreq_cpu_put(policy);
15841787 	}
15851788 
15861789 	return ret_freq;
1790
+}
1791
+EXPORT_SYMBOL(cpufreq_get_hw_max_freq);
1792
+
1793
+static unsigned int __cpufreq_get(struct cpufreq_policy *policy)
1794
+{
1795
+	if (unlikely(policy_is_inactive(policy)))
1796
+		return 0;
1797
+
1798
+	return cpufreq_verify_current_freq(policy, true);
15871799 }
15881800 
15891801 /**
....@@ -1599,7 +1811,8 @@
15991811 
16001812 	if (policy) {
16011813 		down_read(&policy->rwsem);
1602
-		ret_freq = __cpufreq_get(policy);
1814
+		if (cpufreq_driver->get)
1815
+			ret_freq = __cpufreq_get(policy);
16031816 		up_read(&policy->rwsem);
16041817 
16051818 		cpufreq_cpu_put(policy);
....@@ -1608,24 +1821,6 @@
16081821 	return ret_freq;
16091822 }
16101823 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
-}
16291824 
16301825 static struct subsys_interface cpufreq_interface = {
16311826 	.name		= "cpufreq",
....@@ -1688,8 +1883,8 @@
16881883 		}
16891884 
16901885 		if (cpufreq_driver->suspend && cpufreq_driver->suspend(policy))
1691
-			pr_err("%s: Failed to suspend driver: %p\n", __func__,
1692
-				policy);
1886
+			pr_err("%s: Failed to suspend driver: %s\n", __func__,
1887
+				cpufreq_driver->name);
16931888 	}
16941889 
16951890 suspend:
....@@ -1734,6 +1929,18 @@
17341929 				       __func__, policy);
17351930 		}
17361931 	}
1932
+}
1933
+
1934
+/**
1935
+ * cpufreq_driver_test_flags - Test cpufreq driver's flags against given ones.
1936
+ * @flags: Flags to test against the current cpufreq driver's flags.
1937
+ *
1938
+ * Assumes that the driver is there, so callers must ensure that this is the
1939
+ * case.
1940
+ */
1941
+bool cpufreq_driver_test_flags(u16 flags)
1942
+{
1943
+	return !!(cpufreq_driver->flags & flags);
17371944 }
17381945 
17391946 /**
....@@ -1888,15 +2095,30 @@
18882095 unsigned int cpufreq_driver_fast_switch(struct cpufreq_policy *policy,
18892096 					unsigned int target_freq)
18902097 {
1891
-	int ret;
2098
+	unsigned int freq;
2099
+	unsigned int old_target_freq = target_freq;
2100
+	int cpu;
18922101 
18932102 	target_freq = clamp_val(target_freq, policy->min, policy->max);
2103
+	trace_android_vh_cpufreq_fast_switch(policy, target_freq, old_target_freq);
2104
+	freq = cpufreq_driver->fast_switch(policy, target_freq);
18942105 
1895
-	ret = cpufreq_driver->fast_switch(policy, target_freq);
1896
-	if (ret)
1897
-		cpufreq_times_record_transition(policy, ret);
2106
+	if (!freq)
2107
+		return 0;
18982108 
1899
-	return ret;
2109
+	policy->cur = freq;
2110
+	arch_set_freq_scale(policy->related_cpus, freq,
2111
+			    policy->cpuinfo.max_freq);
2112
+	cpufreq_stats_record_transition(policy, freq);
2113
+	cpufreq_times_record_transition(policy, freq);
2114
+	trace_android_rvh_cpufreq_transition(policy);
2115
+
2116
+	if (trace_cpu_frequency_enabled()) {
2117
+		for_each_cpu(cpu, policy->cpus)
2118
+			trace_cpu_frequency(freq, cpu);
2119
+	}
2120
+
2121
+	return freq;
19002122 }
19012123 EXPORT_SYMBOL_GPL(cpufreq_driver_fast_switch);
19022124 
....@@ -1993,11 +2215,9 @@
19932215 	if (cpufreq_disabled())
19942216 		return -ENODEV;
19952217 
1996
-#ifdef CONFIG_ARM_ROCKCHIP_CPUFREQ
1997
-	target_freq = rockchip_cpufreq_adjust_target(policy->cpu, target_freq);
1998
-#endif
19992218 	/* Make sure that target_freq is within supported range */
20002219 	target_freq = clamp_val(target_freq, policy->min, policy->max);
2220
+	trace_android_vh_cpufreq_target(policy, target_freq, old_target_freq);
20012221 
20022222 	pr_debug("target for CPU %u: %u kHz, relation %u, requested %u kHz\n",
20032223 		 policy->cpu, target_freq, relation, old_target_freq);
....@@ -2008,7 +2228,8 @@
20082228 	 * exactly same freq is called again and so we can save on few function
20092229 	 * calls.
20102230 	 */
2011
-	if (target_freq == policy->cur)
2231
+	if (target_freq == policy->cur &&
2232
+	    !(cpufreq_driver->flags & CPUFREQ_NEED_UPDATE_LIMITS))
20122233 		return 0;
20132234 
20142235 	/* Save last value to restore later on errors */
....@@ -2030,7 +2251,7 @@
20302251 			  unsigned int target_freq,
20312252 			  unsigned int relation)
20322253 {
2033
-	int ret = -EINVAL;
2254
+	int ret;
20342255 
20352256 	down_write(&policy->rwsem);
20362257 
....@@ -2062,7 +2283,7 @@
20622283 		return -EINVAL;
20632284 
20642285 	/* Platform doesn't want dynamic frequency switching ? */
2065
-	if (policy->governor->dynamic_switching &&
2286
+	if (policy->governor->flags & CPUFREQ_GOV_DYNAMIC_SWITCHING &&
20662287 	    cpufreq_driver->flags & CPUFREQ_NO_AUTO_DYNAMIC_SWITCHING) {
20672288 		struct cpufreq_governor *gov = cpufreq_fallback_governor();
20682289 
....@@ -2088,6 +2309,8 @@
20882309 		}
20892310 	}
20902311 
2312
+	policy->strict_target = !!(policy->governor->flags & CPUFREQ_GOV_STRICT_TARGET);
2313
+
20912314 	return 0;
20922315 }
20932316 
....@@ -2104,7 +2327,7 @@
21042327 	module_put(policy->governor->owner);
21052328 }
21062329 
2107
-static int cpufreq_start_governor(struct cpufreq_policy *policy)
2330
+int cpufreq_start_governor(struct cpufreq_policy *policy)
21082331 {
21092332 	int ret;
21102333 
....@@ -2116,8 +2339,8 @@
21162339 
21172340 	pr_debug("%s: for CPU %u\n", __func__, policy->cpu);
21182341 
2119
-	if (cpufreq_driver->get && !cpufreq_driver->setpolicy)
2120
-		cpufreq_update_current_freq(policy);
2342
+	if (cpufreq_driver->get)
2343
+		cpufreq_verify_current_freq(policy, false);
21212344 
21222345 	if (policy->governor->start) {
21232346 		ret = policy->governor->start(policy);
....@@ -2131,7 +2354,7 @@
21312354 	return 0;
21322355 }
21332356 
2134
-static void cpufreq_stop_governor(struct cpufreq_policy *policy)
2357
+void cpufreq_stop_governor(struct cpufreq_policy *policy)
21352358 {
21362359 	if (cpufreq_suspended || !policy->governor)
21372360 		return;
....@@ -2212,6 +2435,7 @@
22122435  * cpufreq_get_policy - get the current cpufreq_policy
22132436  * @policy: struct cpufreq_policy into which the current cpufreq_policy
22142437  *	is written
2438
+ * @cpu: CPU to find the policy for
22152439  *
22162440  * Reads the current cpufreq policy.
22172441  */
....@@ -2232,54 +2456,53 @@
22322456 }
22332457 EXPORT_SYMBOL(cpufreq_get_policy);
22342458 
2235
-/*
2236
- * policy : current policy.
2237
- * new_policy: policy to be set.
2459
+/**
2460
+ * cpufreq_set_policy - Modify cpufreq policy parameters.
2461
+ * @policy: Policy object to modify.
2462
+ * @new_gov: Policy governor pointer.
2463
+ * @new_pol: Policy value (for drivers with built-in governors).
2464
+ *
2465
+ * Invoke the cpufreq driver's ->verify() callback to sanity-check the frequency
2466
+ * limits to be set for the policy, update @policy with the verified limits
2467
+ * values and either invoke the driver's ->setpolicy() callback (if present) or
2468
+ * carry out a governor update for @policy.  That is, run the current governor's
2469
+ * ->limits() callback (if @new_gov points to the same object as the one in
2470
+ * @policy) or replace the governor for @policy with @new_gov.
2471
+ *
2472
+ * The cpuinfo part of @policy is not updated by this function.
22382473  */
22392474 static int cpufreq_set_policy(struct cpufreq_policy *policy,
2240
-				struct cpufreq_policy *new_policy)
2475
+			      struct cpufreq_governor *new_gov,
2476
+			      unsigned int new_pol)
22412477 {
2478
+	struct cpufreq_policy_data new_data;
22422479 	struct cpufreq_governor *old_gov;
22432480 	int ret;
22442481 
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
-
2482
+	memcpy(&new_data.cpuinfo, &policy->cpuinfo, sizeof(policy->cpuinfo));
2483
+	new_data.freq_table = policy->freq_table;
2484
+	new_data.cpu = policy->cpu;
22502485 	/*
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
2486
+	 * PM QoS framework collects all the requests from users and provide us
2487
+	 * the final aggregated value here.
22692488 	 */
2270
-	ret = cpufreq_driver->verify(new_policy);
2489
+	new_data.min = freq_qos_read_value(&policy->constraints, FREQ_QOS_MIN);
2490
+	new_data.max = freq_qos_read_value(&policy->constraints, FREQ_QOS_MAX);
2491
+
2492
+	pr_debug("setting new policy for CPU %u: %u - %u kHz\n",
2493
+		 new_data.cpu, new_data.min, new_data.max);
2494
+
2495
+	/*
2496
+	 * Verify that the CPU speed can be set within these limits and make sure
2497
+	 * that min <= max.
2498
+	 */
2499
+	ret = cpufreq_driver->verify(&new_data);
22712500 	if (ret)
22722501 		return ret;
22732502 
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;
2503
+	policy->min = new_data.min;
2504
+	policy->max = new_data.max;
22802505 	trace_cpu_frequency_limits(policy);
2281
-
2282
-	arch_set_max_freq_scale(policy->cpus, policy->max);
22832506 
22842507 	policy->cached_target_freq = UINT_MAX;
22852508 
....@@ -2287,13 +2510,13 @@
22872510 		 policy->min, policy->max);
22882511 
22892512 	if (cpufreq_driver->setpolicy) {
2290
-		policy->policy = new_policy->policy;
2513
+		policy->policy = new_pol;
22912514 		pr_debug("setting range\n");
2292
-		return cpufreq_driver->setpolicy(new_policy);
2515
+		return cpufreq_driver->setpolicy(policy);
22932516 	}
22942517 
2295
-	if (new_policy->governor == policy->governor) {
2296
-		pr_debug("cpufreq: governor limits update\n");
2518
+	if (new_gov == policy->governor) {
2519
+		pr_debug("governor limits update\n");
22972520 		cpufreq_governor_limits(policy);
22982521 		return 0;
22992522 	}
....@@ -2309,12 +2532,12 @@
23092532 	}
23102533 
23112534 	/* start new governor */
2312
-	policy->governor = new_policy->governor;
2535
+	policy->governor = new_gov;
23132536 	ret = cpufreq_init_governor(policy);
23142537 	if (!ret) {
23152538 		ret = cpufreq_start_governor(policy);
23162539 		if (!ret) {
2317
-			pr_debug("cpufreq: governor change\n");
2540
+			pr_debug("governor change\n");
23182541 			return 0;
23192542 		}
23202543 		cpufreq_exit_governor(policy);
....@@ -2332,85 +2555,81 @@
23322555 
23332556 	return ret;
23342557 }
2558
+EXPORT_TRACEPOINT_SYMBOL_GPL(cpu_frequency_limits);
23352559 
23362560 /**
2337
- *	cpufreq_update_policy - re-evaluate an existing cpufreq policy
2338
- *	@cpu: CPU which shall be re-evaluated
2561
+ * cpufreq_update_policy - Re-evaluate an existing cpufreq policy.
2562
+ * @cpu: CPU to re-evaluate the policy for.
23392563  *
2340
- *	Useful for policy notifiers which have different necessities
2341
- *	at different times.
2564
+ * Update the current frequency for the cpufreq policy of @cpu and use
2565
+ * cpufreq_set_policy() to re-apply the min and max limits, which triggers the
2566
+ * evaluation of policy notifiers and the cpufreq driver's ->verify() callback
2567
+ * for the policy in question, among other things.
23422568  */
23432569 void cpufreq_update_policy(unsigned int cpu)
23442570 {
2345
-	struct cpufreq_policy *policy = cpufreq_cpu_get(cpu);
2346
-	struct cpufreq_policy new_policy;
2571
+	struct cpufreq_policy *policy = cpufreq_cpu_acquire(cpu);
23472572 
23482573 	if (!policy)
23492574 		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;
23602575 
23612576 	/*
23622577 	 * BIOS might change freq behind our back
23632578 	 * -> ask driver for current freq and notify governors about a change
23642579 	 */
2365
-	if (cpufreq_driver->get && !cpufreq_driver->setpolicy) {
2366
-		if (cpufreq_suspended)
2367
-			goto unlock;
2580
+	if (cpufreq_driver->get && has_target() &&
2581
+	    (cpufreq_suspended || WARN_ON(!cpufreq_verify_current_freq(policy, false))))
2582
+		goto unlock;
23682583 
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);
2584
+	refresh_frequency_limits(policy);
23752585 
23762586 unlock:
2377
-	up_write(&policy->rwsem);
2378
-
2379
-	cpufreq_cpu_put(policy);
2587
+	cpufreq_cpu_release(policy);
23802588 }
23812589 EXPORT_SYMBOL(cpufreq_update_policy);
2590
+
2591
+/**
2592
+ * cpufreq_update_limits - Update policy limits for a given CPU.
2593
+ * @cpu: CPU to update the policy limits for.
2594
+ *
2595
+ * Invoke the driver's ->update_limits callback if present or call
2596
+ * cpufreq_update_policy() for @cpu.
2597
+ */
2598
+void cpufreq_update_limits(unsigned int cpu)
2599
+{
2600
+	if (cpufreq_driver->update_limits)
2601
+		cpufreq_driver->update_limits(cpu);
2602
+	else
2603
+		cpufreq_update_policy(cpu);
2604
+}
2605
+EXPORT_SYMBOL_GPL(cpufreq_update_limits);
23822606 
23832607 /*********************************************************************
23842608  *               BOOST						     *
23852609  *********************************************************************/
2386
-static int cpufreq_boost_set_sw(int state)
2610
+static int cpufreq_boost_set_sw(struct cpufreq_policy *policy, int state)
23872611 {
2388
-	struct cpufreq_policy *policy;
2389
-	int ret = -EINVAL;
2612
+	int ret;
23902613 
2391
-	for_each_active_policy(policy) {
2392
-		if (!policy->freq_table)
2393
-			continue;
2614
+	if (!policy->freq_table)
2615
+		return -ENXIO;
23942616 
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);
2617
+	ret = cpufreq_frequency_table_cpuinfo(policy, policy->freq_table);
2618
+	if (ret) {
2619
+		pr_err("%s: Policy frequency update failed\n", __func__);
2620
+		return ret;
24072621 	}
24082622 
2409
-	return ret;
2623
+	ret = freq_qos_update_request(policy->max_freq_req, policy->max);
2624
+	if (ret < 0)
2625
+		return ret;
2626
+
2627
+	return 0;
24102628 }
24112629 
24122630 int cpufreq_boost_trigger_state(int state)
24132631 {
2632
+	struct cpufreq_policy *policy;
24142633 	unsigned long flags;
24152634 	int ret = 0;
24162635 
....@@ -2421,22 +2640,32 @@
24212640 	cpufreq_driver->boost_enabled = state;
24222641 	write_unlock_irqrestore(&cpufreq_driver_lock, flags);
24232642 
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");
2643
+	get_online_cpus();
2644
+	for_each_active_policy(policy) {
2645
+		ret = cpufreq_driver->set_boost(policy, state);
2646
+		if (ret)
2647
+			goto err_reset_state;
24322648 	}
2649
+	put_online_cpus();
2650
+
2651
+	return 0;
2652
+
2653
+err_reset_state:
2654
+	put_online_cpus();
2655
+
2656
+	write_lock_irqsave(&cpufreq_driver_lock, flags);
2657
+	cpufreq_driver->boost_enabled = !state;
2658
+	write_unlock_irqrestore(&cpufreq_driver_lock, flags);
2659
+
2660
+	pr_err("%s: Cannot %s BOOST\n",
2661
+	       __func__, state ? "enable" : "disable");
24332662 
24342663 	return ret;
24352664 }
24362665 
24372666 static bool cpufreq_boost_supported(void)
24382667 {
2439
-	return likely(cpufreq_driver) && cpufreq_driver->set_boost;
2668
+	return cpufreq_driver->set_boost;
24402669 }
24412670 
24422671 static int create_boost_sysfs_file(void)
....@@ -2527,7 +2756,8 @@
25272756 		    driver_data->target) ||
25282757 	     (driver_data->setpolicy && (driver_data->target_index ||
25292758 		    driver_data->target)) ||
2530
-	     (!!driver_data->get_intermediate != !!driver_data->target_intermediate))
2759
+	     (!driver_data->get_intermediate != !driver_data->target_intermediate) ||
2760
+	     (!driver_data->online != !driver_data->offline))
25312761 		return -EINVAL;
25322762 
25332763 	pr_debug("trying to register driver %s\n", driver_data->name);
....@@ -2543,6 +2773,15 @@
25432773 	}
25442774 	cpufreq_driver = driver_data;
25452775 	write_unlock_irqrestore(&cpufreq_driver_lock, flags);
2776
+
2777
+	/*
2778
+	 * Mark support for the scheduler's frequency invariance engine for
2779
+	 * drivers that implement target(), target_index() or fast_switch().
2780
+	 */
2781
+	if (!cpufreq_driver->setpolicy) {
2782
+		static_branch_enable_cpuslocked(&cpufreq_freq_invariance);
2783
+		pr_debug("supports frequency invariance");
2784
+	}
25462785 
25472786 	if (driver_data->setpolicy)
25482787 		driver_data->flags |= CPUFREQ_CONST_LOOPS;
....@@ -2592,7 +2831,7 @@
25922831 }
25932832 EXPORT_SYMBOL_GPL(cpufreq_register_driver);
25942833 
2595
-/**
2834
+/*
25962835  * cpufreq_unregister_driver - unregister the current CPUFreq driver
25972836  *
25982837  * Unregister the current CPUFreq driver. Only call this if you have
....@@ -2613,6 +2852,7 @@
26132852 	cpus_read_lock();
26142853 	subsys_interface_unregister(&cpufreq_interface);
26152854 	remove_boost_sysfs_file();
2855
+	static_branch_disable_cpuslocked(&cpufreq_freq_invariance);
26162856 	cpuhp_remove_state_nocalls_cpuslocked(hp_online);
26172857 
26182858 	write_lock_irqsave(&cpufreq_driver_lock, flags);
....@@ -2626,18 +2866,21 @@
26262866 }
26272867 EXPORT_SYMBOL_GPL(cpufreq_unregister_driver);
26282868 
2629
-struct kobject *cpufreq_global_kobject;
2630
-EXPORT_SYMBOL(cpufreq_global_kobject);
2631
-
26322869 static int __init cpufreq_core_init(void)
26332870 {
2871
+	struct cpufreq_governor *gov = cpufreq_default_governor();
2872
+
26342873 	if (cpufreq_disabled())
26352874 		return -ENODEV;
26362875 
26372876 	cpufreq_global_kobject = kobject_create_and_add("cpufreq", &cpu_subsys.dev_root->kobj);
26382877 	BUG_ON(!cpufreq_global_kobject);
26392878 
2879
+	if (!strlen(default_governor))
2880
+		strncpy(default_governor, gov->name, CPUFREQ_NAME_LEN);
2881
+
26402882 	return 0;
26412883 }
26422884 module_param(off, int, 0444);
2885
+module_param_string(default_governor, default_governor, CPUFREQ_NAME_LEN, 0444);
26432886 core_initcall(cpufreq_core_init);