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 static 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 ret
+= sprintf(buf
+ --ret
, "\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 ret
+= sprintf(buf
+ --ret
, "\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 rc
= sysfs_create_group(get_governor_parent_kobj(policy
),
1165 tunables
->usage_count
= 1;
1166 tunables
->above_hispeed_delay
= default_above_hispeed_delay
;
1167 tunables
->nabove_hispeed_delay
=
1168 ARRAY_SIZE(default_above_hispeed_delay
);
1169 tunables
->go_hispeed_load
= DEFAULT_GO_HISPEED_LOAD
;
1170 tunables
->target_loads
= default_target_loads
;
1171 tunables
->ntarget_loads
= ARRAY_SIZE(default_target_loads
);
1172 tunables
->min_sample_time
= DEFAULT_MIN_SAMPLE_TIME
;
1173 tunables
->timer_rate
= DEFAULT_TIMER_RATE
;
1174 tunables
->boostpulse_duration_val
= DEFAULT_MIN_SAMPLE_TIME
;
1175 tunables
->timer_slack_val
= DEFAULT_TIMER_SLACK
;
1177 spin_lock_init(&tunables
->target_loads_lock
);
1178 spin_lock_init(&tunables
->above_hispeed_delay_lock
);
1180 if (!policy
->governor
->initialized
) {
1181 idle_notifier_register(&cpufreq_interactive_idle_nb
);
1182 cpufreq_register_notifier(&cpufreq_notifier_block
,
1183 CPUFREQ_TRANSITION_NOTIFIER
);
1186 policy
->governor_data
= tunables
;
1187 if (!have_governor_per_policy())
1188 common_tunables
= tunables
;
1192 case CPUFREQ_GOV_POLICY_EXIT
:
1193 if (!--tunables
->usage_count
) {
1194 if (policy
->governor
->initialized
== 1) {
1195 cpufreq_unregister_notifier(&cpufreq_notifier_block
,
1196 CPUFREQ_TRANSITION_NOTIFIER
);
1197 idle_notifier_unregister(&cpufreq_interactive_idle_nb
);
1200 sysfs_remove_group(get_governor_parent_kobj(policy
),
1203 common_tunables
= NULL
;
1206 policy
->governor_data
= NULL
;
1209 case CPUFREQ_GOV_START
:
1210 mutex_lock(&gov_lock
);
1212 freq_table
= cpufreq_frequency_get_table(policy
->cpu
);
1213 if (!tunables
->hispeed_freq
)
1214 tunables
->hispeed_freq
= policy
->max
;
1216 for_each_cpu(j
, policy
->cpus
) {
1217 pcpu
= &per_cpu(cpuinfo
, j
);
1218 pcpu
->policy
= policy
;
1219 pcpu
->target_freq
= policy
->cur
;
1220 pcpu
->freq_table
= freq_table
;
1221 pcpu
->floor_freq
= pcpu
->target_freq
;
1222 pcpu
->floor_validate_time
=
1223 ktime_to_us(ktime_get());
1224 pcpu
->hispeed_validate_time
=
1225 pcpu
->floor_validate_time
;
1226 pcpu
->max_freq
= policy
->max
;
1227 down_write(&pcpu
->enable_sem
);
1228 del_timer_sync(&pcpu
->cpu_timer
);
1229 del_timer_sync(&pcpu
->cpu_slack_timer
);
1230 cpufreq_interactive_timer_start(tunables
, j
);
1231 pcpu
->governor_enabled
= 1;
1232 up_write(&pcpu
->enable_sem
);
1235 mutex_unlock(&gov_lock
);
1238 case CPUFREQ_GOV_STOP
:
1239 mutex_lock(&gov_lock
);
1240 for_each_cpu(j
, policy
->cpus
) {
1241 pcpu
= &per_cpu(cpuinfo
, j
);
1242 down_write(&pcpu
->enable_sem
);
1243 pcpu
->governor_enabled
= 0;
1244 del_timer_sync(&pcpu
->cpu_timer
);
1245 del_timer_sync(&pcpu
->cpu_slack_timer
);
1246 up_write(&pcpu
->enable_sem
);
1249 mutex_unlock(&gov_lock
);
1252 case CPUFREQ_GOV_LIMITS
:
1253 if (policy
->max
< policy
->cur
)
1254 __cpufreq_driver_target(policy
,
1255 policy
->max
, CPUFREQ_RELATION_H
);
1256 else if (policy
->min
> policy
->cur
)
1257 __cpufreq_driver_target(policy
,
1258 policy
->min
, CPUFREQ_RELATION_L
);
1259 for_each_cpu(j
, policy
->cpus
) {
1260 pcpu
= &per_cpu(cpuinfo
, j
);
1262 down_read(&pcpu
->enable_sem
);
1263 if (pcpu
->governor_enabled
== 0) {
1264 up_read(&pcpu
->enable_sem
);
1268 spin_lock_irqsave(&pcpu
->target_freq_lock
, flags
);
1269 if (policy
->max
< pcpu
->target_freq
)
1270 pcpu
->target_freq
= policy
->max
;
1271 else if (policy
->min
> pcpu
->target_freq
)
1272 pcpu
->target_freq
= policy
->min
;
1274 spin_unlock_irqrestore(&pcpu
->target_freq_lock
, flags
);
1275 up_read(&pcpu
->enable_sem
);
1277 /* Reschedule timer only if policy->max is raised.
1278 * Delete the timers, else the timer callback may
1279 * return without re-arm the timer when failed
1280 * acquire the semaphore. This race may cause timer
1281 * stopped unexpectedly.
1284 if (policy
->max
> pcpu
->max_freq
) {
1285 down_write(&pcpu
->enable_sem
);
1286 del_timer_sync(&pcpu
->cpu_timer
);
1287 del_timer_sync(&pcpu
->cpu_slack_timer
);
1288 cpufreq_interactive_timer_start(tunables
, j
);
1289 up_write(&pcpu
->enable_sem
);
1292 pcpu
->max_freq
= policy
->max
;
1299 #ifndef CONFIG_CPU_FREQ_DEFAULT_GOV_INTERACTIVE
1302 struct cpufreq_governor cpufreq_gov_interactive
= {
1303 .name
= "interactive",
1304 .governor
= cpufreq_governor_interactive
,
1305 .max_transition_latency
= 10000000,
1306 .owner
= THIS_MODULE
,
1309 static void cpufreq_interactive_nop_timer(unsigned long data
)
1313 static int __init
cpufreq_interactive_init(void)
1316 struct cpufreq_interactive_cpuinfo
*pcpu
;
1317 struct sched_param param
= { .sched_priority
= MAX_RT_PRIO
-1 };
1319 /* Initalize per-cpu timers */
1320 for_each_possible_cpu(i
) {
1321 pcpu
= &per_cpu(cpuinfo
, i
);
1322 init_timer_deferrable(&pcpu
->cpu_timer
);
1323 pcpu
->cpu_timer
.function
= cpufreq_interactive_timer
;
1324 pcpu
->cpu_timer
.data
= i
;
1325 init_timer(&pcpu
->cpu_slack_timer
);
1326 pcpu
->cpu_slack_timer
.function
= cpufreq_interactive_nop_timer
;
1327 spin_lock_init(&pcpu
->load_lock
);
1328 spin_lock_init(&pcpu
->target_freq_lock
);
1329 init_rwsem(&pcpu
->enable_sem
);
1332 spin_lock_init(&speedchange_cpumask_lock
);
1333 mutex_init(&gov_lock
);
1335 kthread_create(cpufreq_interactive_speedchange_task
, NULL
,
1337 if (IS_ERR(speedchange_task
))
1338 return PTR_ERR(speedchange_task
);
1340 sched_setscheduler_nocheck(speedchange_task
, SCHED_FIFO
, ¶m
);
1341 get_task_struct(speedchange_task
);
1343 /* NB: wake up so the thread does not look hung to the freezer */
1344 wake_up_process(speedchange_task
);
1346 return cpufreq_register_governor(&cpufreq_gov_interactive
);
1349 #ifdef CONFIG_CPU_FREQ_DEFAULT_GOV_INTERACTIVE
1350 fs_initcall(cpufreq_interactive_init
);
1352 module_init(cpufreq_interactive_init
);
1355 static void __exit
cpufreq_interactive_exit(void)
1357 cpufreq_unregister_governor(&cpufreq_gov_interactive
);
1358 kthread_stop(speedchange_task
);
1359 put_task_struct(speedchange_task
);
1362 module_exit(cpufreq_interactive_exit
);
1364 MODULE_AUTHOR("Mike Chan <mike@android.com>");
1365 MODULE_DESCRIPTION("'cpufreq_interactive' - A cpufreq governor for "
1366 "Latency sensitive workloads");
1367 MODULE_LICENSE("GPL");