2 * drivers/cpufreq/cpufreq_interactive.c
4 * Copyright (C) 2010 Google, Inc.
6 * This software is licensed under the terms of the GNU General Public
7 * License version 2, as published by the Free Software Foundation, and
8 * may be copied, distributed, and modified under those terms.
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
15 * Author: Mike Chan (mike@android.com)
19 #include <linux/cpu.h>
20 #include <linux/cpumask.h>
21 #include <linux/cpufreq.h>
22 #include <linux/module.h>
23 #include <linux/moduleparam.h>
24 #include <linux/rwsem.h>
25 #include <linux/sched.h>
26 #include <linux/sched/rt.h>
27 #include <linux/tick.h>
28 #include <linux/time.h>
29 #include <linux/timer.h>
30 #include <linux/workqueue.h>
31 #include <linux/kthread.h>
32 #include <linux/slab.h>
33 #include "cpufreq_governor.h"
35 #define CREATE_TRACE_POINTS
36 #include <trace/events/cpufreq_interactive.h>
38 struct cpufreq_interactive_cpuinfo {
39 struct timer_list cpu_timer;
40 struct timer_list cpu_slack_timer;
41 spinlock_t load_lock; /* protects the next 4 fields */
43 u64 time_in_idle_timestamp;
45 u64 cputime_speedadj_timestamp;
46 struct cpufreq_policy *policy;
47 struct cpufreq_frequency_table *freq_table;
48 spinlock_t target_freq_lock; /*protects target freq */
49 unsigned int target_freq;
50 unsigned int floor_freq;
51 unsigned int max_freq;
52 u64 floor_validate_time;
53 u64 hispeed_validate_time;
54 struct rw_semaphore enable_sem;
58 static DEFINE_PER_CPU(struct cpufreq_interactive_cpuinfo, cpuinfo);
60 /* realtime thread handles frequency scaling */
61 static struct task_struct *speedchange_task;
62 static cpumask_t speedchange_cpumask;
63 static spinlock_t speedchange_cpumask_lock;
64 static struct mutex gov_lock;
66 /* Target load. Lower values result in higher CPU speeds. */
67 #define DEFAULT_TARGET_LOAD 90
68 static unsigned int default_target_loads[] = {DEFAULT_TARGET_LOAD};
70 #define DEFAULT_TIMER_RATE (20 * USEC_PER_MSEC)
71 #define DEFAULT_ABOVE_HISPEED_DELAY DEFAULT_TIMER_RATE
72 static unsigned int default_above_hispeed_delay[] = {
73 DEFAULT_ABOVE_HISPEED_DELAY };
75 struct cpufreq_interactive_tunables {
77 /* Hi speed to bump to from lo speed when load burst (default max) */
78 unsigned int hispeed_freq;
79 /* Go to hi speed when CPU load at or above this value. */
80 #define DEFAULT_GO_HISPEED_LOAD 99
81 unsigned long go_hispeed_load;
82 /* Target load. Lower values result in higher CPU speeds. */
83 spinlock_t target_loads_lock;
84 unsigned int *target_loads;
87 * The minimum amount of time to spend at a frequency before we can ramp
90 #define DEFAULT_MIN_SAMPLE_TIME (80 * USEC_PER_MSEC)
91 unsigned long min_sample_time;
93 * The sample rate of the timer used to increase frequency
95 unsigned long timer_rate;
97 * Wait this long before raising speed above hispeed, by default a
98 * single timer interval.
100 spinlock_t above_hispeed_delay_lock;
101 unsigned int *above_hispeed_delay;
102 int nabove_hispeed_delay;
103 /* Non-zero means indefinite speed boost active */
105 /* Duration of a boot pulse in usecs */
106 int boostpulse_duration_val;
107 /* End time of boost pulse in ktime converted to usecs */
108 u64 boostpulse_endtime;
110 * Max additional time to wait in idle, beyond timer_rate, at speeds
111 * above minimum before wakeup to reduce speed, or -1 if unnecessary.
113 #define DEFAULT_TIMER_SLACK (4 * DEFAULT_TIMER_RATE)
118 /* For cases where we have single governor instance for system */
119 struct cpufreq_interactive_tunables *common_tunables;
121 static struct attribute_group *get_sysfs_attr(void);
123 static void cpufreq_interactive_timer_resched(
124 struct cpufreq_interactive_cpuinfo *pcpu)
126 struct cpufreq_interactive_tunables *tunables =
127 pcpu->policy->governor_data;
128 unsigned long expires;
131 spin_lock_irqsave(&pcpu->load_lock, flags);
133 get_cpu_idle_time(smp_processor_id(),
134 &pcpu->time_in_idle_timestamp,
135 tunables->io_is_busy);
136 pcpu->cputime_speedadj = 0;
137 pcpu->cputime_speedadj_timestamp = pcpu->time_in_idle_timestamp;
138 expires = jiffies + usecs_to_jiffies(tunables->timer_rate);
139 mod_timer_pinned(&pcpu->cpu_timer, expires);
141 if (tunables->timer_slack_val >= 0 &&
142 pcpu->target_freq > pcpu->policy->min) {
143 expires += usecs_to_jiffies(tunables->timer_slack_val);
144 mod_timer_pinned(&pcpu->cpu_slack_timer, expires);
147 spin_unlock_irqrestore(&pcpu->load_lock, flags);
150 /* The caller shall take enable_sem write semaphore to avoid any timer race.
151 * The cpu_timer and cpu_slack_timer must be deactivated when calling this
154 static void cpufreq_interactive_timer_start(
155 struct cpufreq_interactive_tunables *tunables, int cpu)
157 struct cpufreq_interactive_cpuinfo *pcpu = &per_cpu(cpuinfo, cpu);
158 unsigned long expires = jiffies +
159 usecs_to_jiffies(tunables->timer_rate);
162 pcpu->cpu_timer.expires = expires;
163 add_timer_on(&pcpu->cpu_timer, cpu);
164 if (tunables->timer_slack_val >= 0 &&
165 pcpu->target_freq > pcpu->policy->min) {
166 expires += usecs_to_jiffies(tunables->timer_slack_val);
167 pcpu->cpu_slack_timer.expires = expires;
168 add_timer_on(&pcpu->cpu_slack_timer, cpu);
171 spin_lock_irqsave(&pcpu->load_lock, flags);
173 get_cpu_idle_time(cpu, &pcpu->time_in_idle_timestamp,
174 tunables->io_is_busy);
175 pcpu->cputime_speedadj = 0;
176 pcpu->cputime_speedadj_timestamp = pcpu->time_in_idle_timestamp;
177 spin_unlock_irqrestore(&pcpu->load_lock, flags);
180 static unsigned int freq_to_above_hispeed_delay(
181 struct cpufreq_interactive_tunables *tunables,
188 spin_lock_irqsave(&tunables->above_hispeed_delay_lock, flags);
190 for (i = 0; i < tunables->nabove_hispeed_delay - 1 &&
191 freq >= tunables->above_hispeed_delay[i+1]; i += 2)
194 ret = tunables->above_hispeed_delay[i];
195 spin_unlock_irqrestore(&tunables->above_hispeed_delay_lock, flags);
199 static unsigned int freq_to_targetload(
200 struct cpufreq_interactive_tunables *tunables, unsigned int freq)
206 spin_lock_irqsave(&tunables->target_loads_lock, flags);
208 for (i = 0; i < tunables->ntarget_loads - 1 &&
209 freq >= tunables->target_loads[i+1]; i += 2)
212 ret = tunables->target_loads[i];
213 spin_unlock_irqrestore(&tunables->target_loads_lock, flags);
218 * If increasing frequencies never map to a lower target load then
219 * choose_freq() will find the minimum frequency that does not exceed its
220 * target load given the current load.
222 static unsigned int choose_freq(struct cpufreq_interactive_cpuinfo *pcpu,
223 unsigned int loadadjfreq)
225 unsigned int freq = pcpu->policy->cur;
226 unsigned int prevfreq, freqmin, freqmax;
235 tl = freq_to_targetload(pcpu->policy->governor_data, freq);
238 * Find the lowest frequency where the computed load is less
239 * than or equal to the target load.
242 if (cpufreq_frequency_table_target(
243 pcpu->policy, pcpu->freq_table, loadadjfreq / tl,
244 CPUFREQ_RELATION_L, &index))
246 freq = pcpu->freq_table[index].frequency;
248 if (freq > prevfreq) {
249 /* The previous frequency is too low. */
252 if (freq >= freqmax) {
254 * Find the highest frequency that is less
257 if (cpufreq_frequency_table_target(
258 pcpu->policy, pcpu->freq_table,
259 freqmax - 1, CPUFREQ_RELATION_H,
262 freq = pcpu->freq_table[index].frequency;
264 if (freq == freqmin) {
266 * The first frequency below freqmax
267 * has already been found to be too
268 * low. freqmax is the lowest speed
269 * we found that is fast enough.
275 } else if (freq < prevfreq) {
276 /* The previous frequency is high enough. */
279 if (freq <= freqmin) {
281 * Find the lowest frequency that is higher
284 if (cpufreq_frequency_table_target(
285 pcpu->policy, pcpu->freq_table,
286 freqmin + 1, CPUFREQ_RELATION_L,
289 freq = pcpu->freq_table[index].frequency;
292 * If freqmax is the first frequency above
293 * freqmin then we have already found that
294 * this speed is fast enough.
301 /* If same frequency chosen as previous then done. */
302 } while (freq != prevfreq);
307 static u64 update_load(int cpu)
309 struct cpufreq_interactive_cpuinfo *pcpu = &per_cpu(cpuinfo, cpu);
310 struct cpufreq_interactive_tunables *tunables =
311 pcpu->policy->governor_data;
318 now_idle = get_cpu_idle_time(cpu, &now, tunables->io_is_busy);
319 delta_idle = (now_idle - pcpu->time_in_idle);
320 delta_time = (now - pcpu->time_in_idle_timestamp);
322 if (delta_time <= delta_idle)
325 active_time = delta_time - delta_idle;
327 pcpu->cputime_speedadj += active_time * pcpu->policy->cur;
329 pcpu->time_in_idle = now_idle;
330 pcpu->time_in_idle_timestamp = now;
334 static void cpufreq_interactive_timer(unsigned long data)
337 unsigned int delta_time;
338 u64 cputime_speedadj;
340 struct cpufreq_interactive_cpuinfo *pcpu =
341 &per_cpu(cpuinfo, data);
342 struct cpufreq_interactive_tunables *tunables =
343 pcpu->policy->governor_data;
344 unsigned int new_freq;
345 unsigned int loadadjfreq;
350 if (!down_read_trylock(&pcpu->enable_sem))
352 if (!pcpu->governor_enabled)
355 spin_lock_irqsave(&pcpu->load_lock, flags);
356 now = update_load(data);
357 delta_time = (unsigned int)(now - pcpu->cputime_speedadj_timestamp);
358 cputime_speedadj = pcpu->cputime_speedadj;
359 spin_unlock_irqrestore(&pcpu->load_lock, flags);
361 if (WARN_ON_ONCE(!delta_time))
364 spin_lock_irqsave(&pcpu->target_freq_lock, flags);
365 do_div(cputime_speedadj, delta_time);
366 loadadjfreq = (unsigned int)cputime_speedadj * 100;
367 cpu_load = loadadjfreq / pcpu->target_freq;
368 boosted = tunables->boost_val || now < tunables->boostpulse_endtime;
370 if (cpu_load >= tunables->go_hispeed_load || boosted) {
371 if (pcpu->target_freq < tunables->hispeed_freq) {
372 new_freq = tunables->hispeed_freq;
374 new_freq = choose_freq(pcpu, loadadjfreq);
376 if (new_freq < tunables->hispeed_freq)
377 new_freq = tunables->hispeed_freq;
380 new_freq = choose_freq(pcpu, loadadjfreq);
381 if (new_freq > tunables->hispeed_freq &&
382 pcpu->target_freq < tunables->hispeed_freq)
383 new_freq = tunables->hispeed_freq;
386 if (pcpu->target_freq >= tunables->hispeed_freq &&
387 new_freq > pcpu->target_freq &&
388 now - pcpu->hispeed_validate_time <
389 freq_to_above_hispeed_delay(tunables, pcpu->target_freq)) {
390 trace_cpufreq_interactive_notyet(
391 data, cpu_load, pcpu->target_freq,
392 pcpu->policy->cur, new_freq);
393 spin_unlock_irqrestore(&pcpu->target_freq_lock, flags);
397 pcpu->hispeed_validate_time = now;
399 if (cpufreq_frequency_table_target(pcpu->policy, pcpu->freq_table,
400 new_freq, CPUFREQ_RELATION_L,
402 spin_unlock_irqrestore(&pcpu->target_freq_lock, flags);
406 new_freq = pcpu->freq_table[index].frequency;
409 * Do not scale below floor_freq unless we have been at or above the
410 * floor frequency for the minimum sample time since last validated.
412 if (new_freq < pcpu->floor_freq) {
413 if (now - pcpu->floor_validate_time <
414 tunables->min_sample_time) {
415 trace_cpufreq_interactive_notyet(
416 data, cpu_load, pcpu->target_freq,
417 pcpu->policy->cur, new_freq);
418 spin_unlock_irqrestore(&pcpu->target_freq_lock, flags);
424 * Update the timestamp for checking whether speed has been held at
425 * or above the selected frequency for a minimum of min_sample_time,
426 * if not boosted to hispeed_freq. If boosted to hispeed_freq then we
427 * allow the speed to drop as soon as the boostpulse duration expires
428 * (or the indefinite boost is turned off).
431 if (!boosted || new_freq > tunables->hispeed_freq) {
432 pcpu->floor_freq = new_freq;
433 pcpu->floor_validate_time = now;
436 if (pcpu->target_freq == new_freq) {
437 trace_cpufreq_interactive_already(
438 data, cpu_load, pcpu->target_freq,
439 pcpu->policy->cur, new_freq);
440 spin_unlock_irqrestore(&pcpu->target_freq_lock, flags);
441 goto rearm_if_notmax;
444 trace_cpufreq_interactive_target(data, cpu_load, pcpu->target_freq,
445 pcpu->policy->cur, new_freq);
447 pcpu->target_freq = new_freq;
448 spin_unlock_irqrestore(&pcpu->target_freq_lock, flags);
449 spin_lock_irqsave(&speedchange_cpumask_lock, flags);
450 cpumask_set_cpu(data, &speedchange_cpumask);
451 spin_unlock_irqrestore(&speedchange_cpumask_lock, flags);
452 wake_up_process(speedchange_task);
456 * Already set max speed and don't see a need to change that,
457 * wait until next idle to re-evaluate, don't need timer.
459 if (pcpu->target_freq == pcpu->policy->max)
463 if (!timer_pending(&pcpu->cpu_timer))
464 cpufreq_interactive_timer_resched(pcpu);
467 up_read(&pcpu->enable_sem);
471 static void cpufreq_interactive_idle_start(void)
473 struct cpufreq_interactive_cpuinfo *pcpu =
474 &per_cpu(cpuinfo, smp_processor_id());
477 if (!down_read_trylock(&pcpu->enable_sem))
479 if (!pcpu->governor_enabled) {
480 up_read(&pcpu->enable_sem);
484 pending = timer_pending(&pcpu->cpu_timer);
486 if (pcpu->target_freq != pcpu->policy->min) {
488 * Entering idle while not at lowest speed. On some
489 * platforms this can hold the other CPU(s) at that speed
490 * even though the CPU is idle. Set a timer to re-evaluate
491 * speed so this idle CPU doesn't hold the other CPUs above
492 * min indefinitely. This should probably be a quirk of
493 * the CPUFreq driver.
496 cpufreq_interactive_timer_resched(pcpu);
499 up_read(&pcpu->enable_sem);
502 static void cpufreq_interactive_idle_end(void)
504 struct cpufreq_interactive_cpuinfo *pcpu =
505 &per_cpu(cpuinfo, smp_processor_id());
507 if (!down_read_trylock(&pcpu->enable_sem))
509 if (!pcpu->governor_enabled) {
510 up_read(&pcpu->enable_sem);
514 /* Arm the timer for 1-2 ticks later if not already. */
515 if (!timer_pending(&pcpu->cpu_timer)) {
516 cpufreq_interactive_timer_resched(pcpu);
517 } else if (time_after_eq(jiffies, pcpu->cpu_timer.expires)) {
518 del_timer(&pcpu->cpu_timer);
519 del_timer(&pcpu->cpu_slack_timer);
520 cpufreq_interactive_timer(smp_processor_id());
523 up_read(&pcpu->enable_sem);
526 static int cpufreq_interactive_speedchange_task(void *data)
531 struct cpufreq_interactive_cpuinfo *pcpu;
534 set_current_state(TASK_INTERRUPTIBLE);
535 spin_lock_irqsave(&speedchange_cpumask_lock, flags);
537 if (cpumask_empty(&speedchange_cpumask)) {
538 spin_unlock_irqrestore(&speedchange_cpumask_lock,
542 if (kthread_should_stop())
545 spin_lock_irqsave(&speedchange_cpumask_lock, flags);
548 set_current_state(TASK_RUNNING);
549 tmp_mask = speedchange_cpumask;
550 cpumask_clear(&speedchange_cpumask);
551 spin_unlock_irqrestore(&speedchange_cpumask_lock, flags);
553 for_each_cpu(cpu, &tmp_mask) {
555 unsigned int max_freq = 0;
557 pcpu = &per_cpu(cpuinfo, cpu);
558 if (!down_read_trylock(&pcpu->enable_sem))
560 if (!pcpu->governor_enabled) {
561 up_read(&pcpu->enable_sem);
565 for_each_cpu(j, pcpu->policy->cpus) {
566 struct cpufreq_interactive_cpuinfo *pjcpu =
567 &per_cpu(cpuinfo, j);
569 if (pjcpu->target_freq > max_freq)
570 max_freq = pjcpu->target_freq;
573 if (max_freq != pcpu->policy->cur)
574 __cpufreq_driver_target(pcpu->policy,
577 trace_cpufreq_interactive_setspeed(cpu,
581 up_read(&pcpu->enable_sem);
588 static void cpufreq_interactive_boost(void)
592 unsigned long flags[2];
593 struct cpufreq_interactive_cpuinfo *pcpu;
594 struct cpufreq_interactive_tunables *tunables;
596 spin_lock_irqsave(&speedchange_cpumask_lock, flags[0]);
598 for_each_online_cpu(i) {
599 pcpu = &per_cpu(cpuinfo, i);
600 tunables = pcpu->policy->governor_data;
602 spin_lock_irqsave(&pcpu->target_freq_lock, flags[1]);
603 if (pcpu->target_freq < tunables->hispeed_freq) {
604 pcpu->target_freq = tunables->hispeed_freq;
605 cpumask_set_cpu(i, &speedchange_cpumask);
606 pcpu->hispeed_validate_time =
607 ktime_to_us(ktime_get());
612 * Set floor freq and (re)start timer for when last
616 pcpu->floor_freq = tunables->hispeed_freq;
617 pcpu->floor_validate_time = ktime_to_us(ktime_get());
618 spin_unlock_irqrestore(&pcpu->target_freq_lock, flags[1]);
621 spin_unlock_irqrestore(&speedchange_cpumask_lock, flags[0]);
624 wake_up_process(speedchange_task);
627 static int cpufreq_interactive_notifier(
628 struct notifier_block *nb, unsigned long val, void *data)
630 struct cpufreq_freqs *freq = data;
631 struct cpufreq_interactive_cpuinfo *pcpu;
635 if (val == CPUFREQ_POSTCHANGE) {
636 pcpu = &per_cpu(cpuinfo, freq->cpu);
637 if (!down_read_trylock(&pcpu->enable_sem))
639 if (!pcpu->governor_enabled) {
640 up_read(&pcpu->enable_sem);
644 for_each_cpu(cpu, pcpu->policy->cpus) {
645 struct cpufreq_interactive_cpuinfo *pjcpu =
646 &per_cpu(cpuinfo, cpu);
647 if (cpu != freq->cpu) {
648 if (!down_read_trylock(&pjcpu->enable_sem))
650 if (!pjcpu->governor_enabled) {
651 up_read(&pjcpu->enable_sem);
655 spin_lock_irqsave(&pjcpu->load_lock, flags);
657 spin_unlock_irqrestore(&pjcpu->load_lock, flags);
658 if (cpu != freq->cpu)
659 up_read(&pjcpu->enable_sem);
662 up_read(&pcpu->enable_sem);
667 static struct notifier_block cpufreq_notifier_block = {
668 .notifier_call = cpufreq_interactive_notifier,
671 static unsigned int *get_tokenized_data(const char *buf, int *num_tokens)
676 unsigned int *tokenized_data;
680 while ((cp = strpbrk(cp + 1, " :")))
683 if (!(ntokens & 0x1))
686 tokenized_data = kmalloc(ntokens * sizeof(unsigned int), GFP_KERNEL);
687 if (!tokenized_data) {
694 while (i < ntokens) {
695 if (sscanf(cp, "%u", &tokenized_data[i++]) != 1)
698 cp = strpbrk(cp, " :");
707 *num_tokens = ntokens;
708 return tokenized_data;
711 kfree(tokenized_data);
716 static ssize_t show_target_loads(
717 struct cpufreq_interactive_tunables *tunables,
724 spin_lock_irqsave(&tunables->target_loads_lock, flags);
726 for (i = 0; i < tunables->ntarget_loads; i++)
727 ret += sprintf(buf + ret, "%u%s", tunables->target_loads[i],
728 i & 0x1 ? ":" : " ");
730 sprintf(buf + ret - 1, "\n");
731 spin_unlock_irqrestore(&tunables->target_loads_lock, flags);
735 static ssize_t store_target_loads(
736 struct cpufreq_interactive_tunables *tunables,
737 const char *buf, size_t count)
740 unsigned int *new_target_loads = NULL;
743 new_target_loads = get_tokenized_data(buf, &ntokens);
744 if (IS_ERR(new_target_loads))
745 return PTR_RET(new_target_loads);
747 spin_lock_irqsave(&tunables->target_loads_lock, flags);
748 if (tunables->target_loads != default_target_loads)
749 kfree(tunables->target_loads);
750 tunables->target_loads = new_target_loads;
751 tunables->ntarget_loads = ntokens;
752 spin_unlock_irqrestore(&tunables->target_loads_lock, flags);
756 static ssize_t show_above_hispeed_delay(
757 struct cpufreq_interactive_tunables *tunables, char *buf)
763 spin_lock_irqsave(&tunables->above_hispeed_delay_lock, flags);
765 for (i = 0; i < tunables->nabove_hispeed_delay; i++)
766 ret += sprintf(buf + ret, "%u%s",
767 tunables->above_hispeed_delay[i],
768 i & 0x1 ? ":" : " ");
770 sprintf(buf + ret - 1, "\n");
771 spin_unlock_irqrestore(&tunables->above_hispeed_delay_lock, flags);
775 static ssize_t store_above_hispeed_delay(
776 struct cpufreq_interactive_tunables *tunables,
777 const char *buf, size_t count)
780 unsigned int *new_above_hispeed_delay = NULL;
783 new_above_hispeed_delay = get_tokenized_data(buf, &ntokens);
784 if (IS_ERR(new_above_hispeed_delay))
785 return PTR_RET(new_above_hispeed_delay);
787 spin_lock_irqsave(&tunables->above_hispeed_delay_lock, flags);
788 if (tunables->above_hispeed_delay != default_above_hispeed_delay)
789 kfree(tunables->above_hispeed_delay);
790 tunables->above_hispeed_delay = new_above_hispeed_delay;
791 tunables->nabove_hispeed_delay = ntokens;
792 spin_unlock_irqrestore(&tunables->above_hispeed_delay_lock, flags);
797 static ssize_t show_hispeed_freq(struct cpufreq_interactive_tunables *tunables,
800 return sprintf(buf, "%u\n", tunables->hispeed_freq);
803 static ssize_t store_hispeed_freq(struct cpufreq_interactive_tunables *tunables,
804 const char *buf, size_t count)
807 long unsigned int val;
809 ret = strict_strtoul(buf, 0, &val);
812 tunables->hispeed_freq = val;
816 static ssize_t show_go_hispeed_load(struct cpufreq_interactive_tunables
817 *tunables, char *buf)
819 return sprintf(buf, "%lu\n", tunables->go_hispeed_load);
822 static ssize_t store_go_hispeed_load(struct cpufreq_interactive_tunables
823 *tunables, const char *buf, size_t count)
828 ret = strict_strtoul(buf, 0, &val);
831 tunables->go_hispeed_load = val;
835 static ssize_t show_min_sample_time(struct cpufreq_interactive_tunables
836 *tunables, char *buf)
838 return sprintf(buf, "%lu\n", tunables->min_sample_time);
841 static ssize_t store_min_sample_time(struct cpufreq_interactive_tunables
842 *tunables, const char *buf, size_t count)
847 ret = strict_strtoul(buf, 0, &val);
850 tunables->min_sample_time = val;
854 static ssize_t show_timer_rate(struct cpufreq_interactive_tunables *tunables,
857 return sprintf(buf, "%lu\n", tunables->timer_rate);
860 static ssize_t store_timer_rate(struct cpufreq_interactive_tunables *tunables,
861 const char *buf, size_t count)
866 ret = strict_strtoul(buf, 0, &val);
869 tunables->timer_rate = val;
873 static ssize_t show_timer_slack(struct cpufreq_interactive_tunables *tunables,
876 return sprintf(buf, "%d\n", tunables->timer_slack_val);
879 static ssize_t store_timer_slack(struct cpufreq_interactive_tunables *tunables,
880 const char *buf, size_t count)
885 ret = kstrtol(buf, 10, &val);
889 tunables->timer_slack_val = val;
893 static ssize_t show_boost(struct cpufreq_interactive_tunables *tunables,
896 return sprintf(buf, "%d\n", tunables->boost_val);
899 static ssize_t store_boost(struct cpufreq_interactive_tunables *tunables,
900 const char *buf, size_t count)
905 ret = kstrtoul(buf, 0, &val);
909 tunables->boost_val = val;
911 if (tunables->boost_val) {
912 trace_cpufreq_interactive_boost("on");
913 cpufreq_interactive_boost();
915 tunables->boostpulse_endtime = ktime_to_us(ktime_get());
916 trace_cpufreq_interactive_unboost("off");
922 static ssize_t store_boostpulse(struct cpufreq_interactive_tunables *tunables,
923 const char *buf, size_t count)
928 ret = kstrtoul(buf, 0, &val);
932 tunables->boostpulse_endtime = ktime_to_us(ktime_get()) +
933 tunables->boostpulse_duration_val;
934 trace_cpufreq_interactive_boost("pulse");
935 cpufreq_interactive_boost();
939 static ssize_t show_boostpulse_duration(struct cpufreq_interactive_tunables
940 *tunables, char *buf)
942 return sprintf(buf, "%d\n", tunables->boostpulse_duration_val);
945 static ssize_t store_boostpulse_duration(struct cpufreq_interactive_tunables
946 *tunables, const char *buf, size_t count)
951 ret = kstrtoul(buf, 0, &val);
955 tunables->boostpulse_duration_val = val;
959 static ssize_t show_io_is_busy(struct cpufreq_interactive_tunables *tunables,
962 return sprintf(buf, "%u\n", tunables->io_is_busy);
965 static ssize_t store_io_is_busy(struct cpufreq_interactive_tunables *tunables,
966 const char *buf, size_t count)
971 ret = kstrtoul(buf, 0, &val);
974 tunables->io_is_busy = val;
979 * Create show/store routines
980 * - sys: One governor instance for complete SYSTEM
981 * - pol: One governor instance per struct cpufreq_policy
983 #define show_gov_pol_sys(file_name) \
984 static ssize_t show_##file_name##_gov_sys \
985 (struct kobject *kobj, struct attribute *attr, char *buf) \
987 return show_##file_name(common_tunables, buf); \
990 static ssize_t show_##file_name##_gov_pol \
991 (struct cpufreq_policy *policy, char *buf) \
993 return show_##file_name(policy->governor_data, buf); \
996 #define store_gov_pol_sys(file_name) \
997 static ssize_t store_##file_name##_gov_sys \
998 (struct kobject *kobj, struct attribute *attr, const char *buf, \
1001 return store_##file_name(common_tunables, buf, count); \
1004 static ssize_t store_##file_name##_gov_pol \
1005 (struct cpufreq_policy *policy, const char *buf, size_t count) \
1007 return store_##file_name(policy->governor_data, buf, count); \
1010 #define show_store_gov_pol_sys(file_name) \
1011 show_gov_pol_sys(file_name); \
1012 store_gov_pol_sys(file_name)
1014 show_store_gov_pol_sys(target_loads);
1015 show_store_gov_pol_sys(above_hispeed_delay);
1016 show_store_gov_pol_sys(hispeed_freq);
1017 show_store_gov_pol_sys(go_hispeed_load);
1018 show_store_gov_pol_sys(min_sample_time);
1019 show_store_gov_pol_sys(timer_rate);
1020 show_store_gov_pol_sys(timer_slack);
1021 show_store_gov_pol_sys(boost);
1022 store_gov_pol_sys(boostpulse);
1023 show_store_gov_pol_sys(boostpulse_duration);
1024 show_store_gov_pol_sys(io_is_busy);
1026 #define gov_sys_attr_rw(_name) \
1027 static struct global_attr _name##_gov_sys = \
1028 __ATTR(_name, 0644, show_##_name##_gov_sys, store_##_name##_gov_sys)
1030 #define gov_pol_attr_rw(_name) \
1031 static struct freq_attr _name##_gov_pol = \
1032 __ATTR(_name, 0644, show_##_name##_gov_pol, store_##_name##_gov_pol)
1034 #define gov_sys_pol_attr_rw(_name) \
1035 gov_sys_attr_rw(_name); \
1036 gov_pol_attr_rw(_name)
1038 gov_sys_pol_attr_rw(target_loads);
1039 gov_sys_pol_attr_rw(above_hispeed_delay);
1040 gov_sys_pol_attr_rw(hispeed_freq);
1041 gov_sys_pol_attr_rw(go_hispeed_load);
1042 gov_sys_pol_attr_rw(min_sample_time);
1043 gov_sys_pol_attr_rw(timer_rate);
1044 gov_sys_pol_attr_rw(timer_slack);
1045 gov_sys_pol_attr_rw(boost);
1046 gov_sys_pol_attr_rw(boostpulse_duration);
1047 gov_sys_pol_attr_rw(io_is_busy);
1049 static struct global_attr boostpulse_gov_sys =
1050 __ATTR(boostpulse, 0200, NULL, store_boostpulse_gov_sys);
1052 static struct freq_attr boostpulse_gov_pol =
1053 __ATTR(boostpulse, 0200, NULL, store_boostpulse_gov_pol);
1055 /* One Governor instance for entire system */
1056 static struct attribute *interactive_attributes_gov_sys[] = {
1057 &target_loads_gov_sys.attr,
1058 &above_hispeed_delay_gov_sys.attr,
1059 &hispeed_freq_gov_sys.attr,
1060 &go_hispeed_load_gov_sys.attr,
1061 &min_sample_time_gov_sys.attr,
1062 &timer_rate_gov_sys.attr,
1063 &timer_slack_gov_sys.attr,
1064 &boost_gov_sys.attr,
1065 &boostpulse_gov_sys.attr,
1066 &boostpulse_duration_gov_sys.attr,
1067 &io_is_busy_gov_sys.attr,
1071 static struct attribute_group interactive_attr_group_gov_sys = {
1072 .attrs = interactive_attributes_gov_sys,
1073 .name = "interactive",
1076 /* Per policy governor instance */
1077 static struct attribute *interactive_attributes_gov_pol[] = {
1078 &target_loads_gov_pol.attr,
1079 &above_hispeed_delay_gov_pol.attr,
1080 &hispeed_freq_gov_pol.attr,
1081 &go_hispeed_load_gov_pol.attr,
1082 &min_sample_time_gov_pol.attr,
1083 &timer_rate_gov_pol.attr,
1084 &timer_slack_gov_pol.attr,
1085 &boost_gov_pol.attr,
1086 &boostpulse_gov_pol.attr,
1087 &boostpulse_duration_gov_pol.attr,
1088 &io_is_busy_gov_pol.attr,
1092 static struct attribute_group interactive_attr_group_gov_pol = {
1093 .attrs = interactive_attributes_gov_pol,
1094 .name = "interactive",
1097 static struct attribute_group *get_sysfs_attr(void)
1099 if (have_governor_per_policy())
1100 return &interactive_attr_group_gov_pol;
1102 return &interactive_attr_group_gov_sys;
1105 static int cpufreq_interactive_idle_notifier(struct notifier_block *nb,
1111 cpufreq_interactive_idle_start();
1114 cpufreq_interactive_idle_end();
1121 static struct notifier_block cpufreq_interactive_idle_nb = {
1122 .notifier_call = cpufreq_interactive_idle_notifier,
1125 static int cpufreq_governor_interactive(struct cpufreq_policy *policy,
1130 struct cpufreq_interactive_cpuinfo *pcpu;
1131 struct cpufreq_frequency_table *freq_table;
1132 struct cpufreq_interactive_tunables *tunables;
1133 unsigned long flags;
1135 if (have_governor_per_policy())
1136 tunables = policy->governor_data;
1138 tunables = common_tunables;
1140 WARN_ON(!tunables && (event != CPUFREQ_GOV_POLICY_INIT));
1143 case CPUFREQ_GOV_POLICY_INIT:
1144 if (have_governor_per_policy()) {
1146 } else if (tunables) {
1147 tunables->usage_count++;
1148 policy->governor_data = tunables;
1152 tunables = kzalloc(sizeof(*tunables), GFP_KERNEL);
1154 pr_err("%s: POLICY_INIT: kzalloc failed\n", __func__);
1158 tunables->usage_count = 1;
1159 tunables->above_hispeed_delay = default_above_hispeed_delay;
1160 tunables->nabove_hispeed_delay =
1161 ARRAY_SIZE(default_above_hispeed_delay);
1162 tunables->go_hispeed_load = DEFAULT_GO_HISPEED_LOAD;
1163 tunables->target_loads = default_target_loads;
1164 tunables->ntarget_loads = ARRAY_SIZE(default_target_loads);
1165 tunables->min_sample_time = DEFAULT_MIN_SAMPLE_TIME;
1166 tunables->timer_rate = DEFAULT_TIMER_RATE;
1167 tunables->boostpulse_duration_val = DEFAULT_MIN_SAMPLE_TIME;
1168 tunables->timer_slack_val = DEFAULT_TIMER_SLACK;
1170 spin_lock_init(&tunables->target_loads_lock);
1171 spin_lock_init(&tunables->above_hispeed_delay_lock);
1173 policy->governor_data = tunables;
1174 if (!have_governor_per_policy())
1175 common_tunables = tunables;
1177 rc = sysfs_create_group(get_governor_parent_kobj(policy),
1181 policy->governor_data = NULL;
1182 if (!have_governor_per_policy())
1183 common_tunables = NULL;
1187 if (!policy->governor->initialized) {
1188 idle_notifier_register(&cpufreq_interactive_idle_nb);
1189 cpufreq_register_notifier(&cpufreq_notifier_block,
1190 CPUFREQ_TRANSITION_NOTIFIER);
1195 case CPUFREQ_GOV_POLICY_EXIT:
1196 if (!--tunables->usage_count) {
1197 if (policy->governor->initialized == 1) {
1198 cpufreq_unregister_notifier(&cpufreq_notifier_block,
1199 CPUFREQ_TRANSITION_NOTIFIER);
1200 idle_notifier_unregister(&cpufreq_interactive_idle_nb);
1203 sysfs_remove_group(get_governor_parent_kobj(policy),
1206 common_tunables = NULL;
1209 policy->governor_data = NULL;
1212 case CPUFREQ_GOV_START:
1213 mutex_lock(&gov_lock);
1215 freq_table = cpufreq_frequency_get_table(policy->cpu);
1216 if (!tunables->hispeed_freq)
1217 tunables->hispeed_freq = policy->max;
1219 for_each_cpu(j, policy->cpus) {
1220 pcpu = &per_cpu(cpuinfo, j);
1221 pcpu->policy = policy;
1222 pcpu->target_freq = policy->cur;
1223 pcpu->freq_table = freq_table;
1224 pcpu->floor_freq = pcpu->target_freq;
1225 pcpu->floor_validate_time =
1226 ktime_to_us(ktime_get());
1227 pcpu->hispeed_validate_time =
1228 pcpu->floor_validate_time;
1229 pcpu->max_freq = policy->max;
1230 down_write(&pcpu->enable_sem);
1231 del_timer_sync(&pcpu->cpu_timer);
1232 del_timer_sync(&pcpu->cpu_slack_timer);
1233 cpufreq_interactive_timer_start(tunables, j);
1234 pcpu->governor_enabled = 1;
1235 up_write(&pcpu->enable_sem);
1238 mutex_unlock(&gov_lock);
1241 case CPUFREQ_GOV_STOP:
1242 mutex_lock(&gov_lock);
1243 for_each_cpu(j, policy->cpus) {
1244 pcpu = &per_cpu(cpuinfo, j);
1245 down_write(&pcpu->enable_sem);
1246 pcpu->governor_enabled = 0;
1247 del_timer_sync(&pcpu->cpu_timer);
1248 del_timer_sync(&pcpu->cpu_slack_timer);
1249 up_write(&pcpu->enable_sem);
1252 mutex_unlock(&gov_lock);
1255 case CPUFREQ_GOV_LIMITS:
1256 if (policy->max < policy->cur)
1257 __cpufreq_driver_target(policy,
1258 policy->max, CPUFREQ_RELATION_H);
1259 else if (policy->min > policy->cur)
1260 __cpufreq_driver_target(policy,
1261 policy->min, CPUFREQ_RELATION_L);
1262 for_each_cpu(j, policy->cpus) {
1263 pcpu = &per_cpu(cpuinfo, j);
1265 down_read(&pcpu->enable_sem);
1266 if (pcpu->governor_enabled == 0) {
1267 up_read(&pcpu->enable_sem);
1271 spin_lock_irqsave(&pcpu->target_freq_lock, flags);
1272 if (policy->max < pcpu->target_freq)
1273 pcpu->target_freq = policy->max;
1274 else if (policy->min > pcpu->target_freq)
1275 pcpu->target_freq = policy->min;
1277 spin_unlock_irqrestore(&pcpu->target_freq_lock, flags);
1278 up_read(&pcpu->enable_sem);
1280 /* Reschedule timer only if policy->max is raised.
1281 * Delete the timers, else the timer callback may
1282 * return without re-arm the timer when failed
1283 * acquire the semaphore. This race may cause timer
1284 * stopped unexpectedly.
1287 if (policy->max > pcpu->max_freq) {
1288 down_write(&pcpu->enable_sem);
1289 del_timer_sync(&pcpu->cpu_timer);
1290 del_timer_sync(&pcpu->cpu_slack_timer);
1291 cpufreq_interactive_timer_start(tunables, j);
1292 up_write(&pcpu->enable_sem);
1295 pcpu->max_freq = policy->max;
1302 #ifndef CONFIG_CPU_FREQ_DEFAULT_GOV_INTERACTIVE
1305 struct cpufreq_governor cpufreq_gov_interactive = {
1306 .name = "interactive",
1307 .governor = cpufreq_governor_interactive,
1308 .max_transition_latency = 10000000,
1309 .owner = THIS_MODULE,
1312 static void cpufreq_interactive_nop_timer(unsigned long data)
1316 static int __init cpufreq_interactive_init(void)
1319 struct cpufreq_interactive_cpuinfo *pcpu;
1320 struct sched_param param = { .sched_priority = MAX_RT_PRIO-1 };
1322 /* Initalize per-cpu timers */
1323 for_each_possible_cpu(i) {
1324 pcpu = &per_cpu(cpuinfo, i);
1325 init_timer_deferrable(&pcpu->cpu_timer);
1326 pcpu->cpu_timer.function = cpufreq_interactive_timer;
1327 pcpu->cpu_timer.data = i;
1328 init_timer(&pcpu->cpu_slack_timer);
1329 pcpu->cpu_slack_timer.function = cpufreq_interactive_nop_timer;
1330 spin_lock_init(&pcpu->load_lock);
1331 spin_lock_init(&pcpu->target_freq_lock);
1332 init_rwsem(&pcpu->enable_sem);
1335 spin_lock_init(&speedchange_cpumask_lock);
1336 mutex_init(&gov_lock);
1338 kthread_create(cpufreq_interactive_speedchange_task, NULL,
1340 if (IS_ERR(speedchange_task))
1341 return PTR_ERR(speedchange_task);
1343 sched_setscheduler_nocheck(speedchange_task, SCHED_FIFO, ¶m);
1344 get_task_struct(speedchange_task);
1346 /* NB: wake up so the thread does not look hung to the freezer */
1347 wake_up_process(speedchange_task);
1349 return cpufreq_register_governor(&cpufreq_gov_interactive);
1352 #ifdef CONFIG_CPU_FREQ_DEFAULT_GOV_INTERACTIVE
1353 fs_initcall(cpufreq_interactive_init);
1355 module_init(cpufreq_interactive_init);
1358 static void __exit cpufreq_interactive_exit(void)
1360 cpufreq_unregister_governor(&cpufreq_gov_interactive);
1361 kthread_stop(speedchange_task);
1362 put_task_struct(speedchange_task);
1365 module_exit(cpufreq_interactive_exit);
1367 MODULE_AUTHOR("Mike Chan <mike@android.com>");
1368 MODULE_DESCRIPTION("'cpufreq_interactive' - A cpufreq governor for "
1369 "Latency sensitive workloads");
1370 MODULE_LICENSE("GPL");