Commit | Line | Data |
---|---|---|
6fa3eb70 S |
1 | /* |
2 | * drivers/cpufreq/cpufreq_interactive.c | |
3 | * | |
4 | * Copyright (C) 2010 Google, Inc. | |
5 | * | |
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. | |
9 | * | |
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. | |
14 | * | |
15 | * Author: Mike Chan (mike@android.com) | |
16 | * | |
17 | */ | |
18 | ||
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" | |
34 | ||
35 | #define CREATE_TRACE_POINTS | |
36 | #include <trace/events/cpufreq_interactive.h> | |
37 | ||
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 */ | |
42 | u64 time_in_idle; | |
43 | u64 time_in_idle_timestamp; | |
44 | u64 cputime_speedadj; | |
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; | |
55 | int governor_enabled; | |
56 | }; | |
57 | ||
58 | static DEFINE_PER_CPU(struct cpufreq_interactive_cpuinfo, cpuinfo); | |
59 | ||
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; | |
65 | ||
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}; | |
69 | ||
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 }; | |
74 | ||
75 | struct cpufreq_interactive_tunables { | |
76 | int usage_count; | |
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; | |
85 | int ntarget_loads; | |
86 | /* | |
87 | * The minimum amount of time to spend at a frequency before we can ramp | |
88 | * down. | |
89 | */ | |
90 | #define DEFAULT_MIN_SAMPLE_TIME (80 * USEC_PER_MSEC) | |
91 | unsigned long min_sample_time; | |
92 | /* | |
93 | * The sample rate of the timer used to increase frequency | |
94 | */ | |
95 | unsigned long timer_rate; | |
96 | /* | |
97 | * Wait this long before raising speed above hispeed, by default a | |
98 | * single timer interval. | |
99 | */ | |
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 */ | |
104 | int boost_val; | |
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; | |
109 | /* | |
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. | |
112 | */ | |
113 | #define DEFAULT_TIMER_SLACK (4 * DEFAULT_TIMER_RATE) | |
114 | int timer_slack_val; | |
115 | bool io_is_busy; | |
116 | }; | |
117 | ||
118 | /* For cases where we have single governor instance for system */ | |
119 | static struct cpufreq_interactive_tunables *common_tunables; | |
120 | ||
121 | static struct attribute_group *get_sysfs_attr(void); | |
122 | ||
123 | static void cpufreq_interactive_timer_resched( | |
124 | struct cpufreq_interactive_cpuinfo *pcpu) | |
125 | { | |
126 | struct cpufreq_interactive_tunables *tunables = | |
127 | pcpu->policy->governor_data; | |
128 | unsigned long expires; | |
129 | unsigned long flags; | |
130 | ||
131 | spin_lock_irqsave(&pcpu->load_lock, flags); | |
132 | pcpu->time_in_idle = | |
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); | |
140 | ||
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); | |
145 | } | |
146 | ||
147 | spin_unlock_irqrestore(&pcpu->load_lock, flags); | |
148 | } | |
149 | ||
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 | |
152 | * function. | |
153 | */ | |
154 | static void cpufreq_interactive_timer_start( | |
155 | struct cpufreq_interactive_tunables *tunables, int cpu) | |
156 | { | |
157 | struct cpufreq_interactive_cpuinfo *pcpu = &per_cpu(cpuinfo, cpu); | |
158 | unsigned long expires = jiffies + | |
159 | usecs_to_jiffies(tunables->timer_rate); | |
160 | unsigned long flags; | |
161 | ||
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); | |
169 | } | |
170 | ||
171 | spin_lock_irqsave(&pcpu->load_lock, flags); | |
172 | pcpu->time_in_idle = | |
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); | |
178 | } | |
179 | ||
180 | static unsigned int freq_to_above_hispeed_delay( | |
181 | struct cpufreq_interactive_tunables *tunables, | |
182 | unsigned int freq) | |
183 | { | |
184 | int i; | |
185 | unsigned int ret; | |
186 | unsigned long flags; | |
187 | ||
188 | spin_lock_irqsave(&tunables->above_hispeed_delay_lock, flags); | |
189 | ||
190 | for (i = 0; i < tunables->nabove_hispeed_delay - 1 && | |
191 | freq >= tunables->above_hispeed_delay[i+1]; i += 2) | |
192 | ; | |
193 | ||
194 | ret = tunables->above_hispeed_delay[i]; | |
195 | spin_unlock_irqrestore(&tunables->above_hispeed_delay_lock, flags); | |
196 | return ret; | |
197 | } | |
198 | ||
199 | static unsigned int freq_to_targetload( | |
200 | struct cpufreq_interactive_tunables *tunables, unsigned int freq) | |
201 | { | |
202 | int i; | |
203 | unsigned int ret; | |
204 | unsigned long flags; | |
205 | ||
206 | spin_lock_irqsave(&tunables->target_loads_lock, flags); | |
207 | ||
208 | for (i = 0; i < tunables->ntarget_loads - 1 && | |
209 | freq >= tunables->target_loads[i+1]; i += 2) | |
210 | ; | |
211 | ||
212 | ret = tunables->target_loads[i]; | |
213 | spin_unlock_irqrestore(&tunables->target_loads_lock, flags); | |
214 | return ret; | |
215 | } | |
216 | ||
217 | /* | |
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. | |
221 | */ | |
222 | static unsigned int choose_freq(struct cpufreq_interactive_cpuinfo *pcpu, | |
223 | unsigned int loadadjfreq) | |
224 | { | |
225 | unsigned int freq = pcpu->policy->cur; | |
226 | unsigned int prevfreq, freqmin, freqmax; | |
227 | unsigned int tl; | |
228 | int index; | |
229 | ||
230 | freqmin = 0; | |
231 | freqmax = UINT_MAX; | |
232 | ||
233 | do { | |
234 | prevfreq = freq; | |
235 | tl = freq_to_targetload(pcpu->policy->governor_data, freq); | |
236 | ||
237 | /* | |
238 | * Find the lowest frequency where the computed load is less | |
239 | * than or equal to the target load. | |
240 | */ | |
241 | ||
242 | if (cpufreq_frequency_table_target( | |
243 | pcpu->policy, pcpu->freq_table, loadadjfreq / tl, | |
244 | CPUFREQ_RELATION_L, &index)) | |
245 | break; | |
246 | freq = pcpu->freq_table[index].frequency; | |
247 | ||
248 | if (freq > prevfreq) { | |
249 | /* The previous frequency is too low. */ | |
250 | freqmin = prevfreq; | |
251 | ||
252 | if (freq >= freqmax) { | |
253 | /* | |
254 | * Find the highest frequency that is less | |
255 | * than freqmax. | |
256 | */ | |
257 | if (cpufreq_frequency_table_target( | |
258 | pcpu->policy, pcpu->freq_table, | |
259 | freqmax - 1, CPUFREQ_RELATION_H, | |
260 | &index)) | |
261 | break; | |
262 | freq = pcpu->freq_table[index].frequency; | |
263 | ||
264 | if (freq == freqmin) { | |
265 | /* | |
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. | |
270 | */ | |
271 | freq = freqmax; | |
272 | break; | |
273 | } | |
274 | } | |
275 | } else if (freq < prevfreq) { | |
276 | /* The previous frequency is high enough. */ | |
277 | freqmax = prevfreq; | |
278 | ||
279 | if (freq <= freqmin) { | |
280 | /* | |
281 | * Find the lowest frequency that is higher | |
282 | * than freqmin. | |
283 | */ | |
284 | if (cpufreq_frequency_table_target( | |
285 | pcpu->policy, pcpu->freq_table, | |
286 | freqmin + 1, CPUFREQ_RELATION_L, | |
287 | &index)) | |
288 | break; | |
289 | freq = pcpu->freq_table[index].frequency; | |
290 | ||
291 | /* | |
292 | * If freqmax is the first frequency above | |
293 | * freqmin then we have already found that | |
294 | * this speed is fast enough. | |
295 | */ | |
296 | if (freq == freqmax) | |
297 | break; | |
298 | } | |
299 | } | |
300 | ||
301 | /* If same frequency chosen as previous then done. */ | |
302 | } while (freq != prevfreq); | |
303 | ||
304 | return freq; | |
305 | } | |
306 | ||
307 | static u64 update_load(int cpu) | |
308 | { | |
309 | struct cpufreq_interactive_cpuinfo *pcpu = &per_cpu(cpuinfo, cpu); | |
310 | struct cpufreq_interactive_tunables *tunables = | |
311 | pcpu->policy->governor_data; | |
312 | u64 now; | |
313 | u64 now_idle; | |
314 | u64 delta_idle; | |
315 | u64 delta_time; | |
316 | u64 active_time; | |
317 | ||
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); | |
321 | ||
322 | if (delta_time <= delta_idle) | |
323 | active_time = 0; | |
324 | else | |
325 | active_time = delta_time - delta_idle; | |
326 | ||
327 | pcpu->cputime_speedadj += active_time * pcpu->policy->cur; | |
328 | ||
329 | pcpu->time_in_idle = now_idle; | |
330 | pcpu->time_in_idle_timestamp = now; | |
331 | return now; | |
332 | } | |
333 | ||
334 | static void cpufreq_interactive_timer(unsigned long data) | |
335 | { | |
336 | u64 now; | |
337 | unsigned int delta_time; | |
338 | u64 cputime_speedadj; | |
339 | int cpu_load; | |
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; | |
346 | unsigned int index; | |
347 | unsigned long flags; | |
348 | bool boosted; | |
349 | ||
350 | if (!down_read_trylock(&pcpu->enable_sem)) | |
351 | return; | |
352 | if (!pcpu->governor_enabled) | |
353 | goto exit; | |
354 | ||
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); | |
360 | ||
361 | if (WARN_ON_ONCE(!delta_time)) | |
362 | goto rearm; | |
363 | ||
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; | |
369 | ||
370 | if (cpu_load >= tunables->go_hispeed_load || boosted) { | |
371 | if (pcpu->target_freq < tunables->hispeed_freq) { | |
372 | new_freq = tunables->hispeed_freq; | |
373 | } else { | |
374 | new_freq = choose_freq(pcpu, loadadjfreq); | |
375 | ||
376 | if (new_freq < tunables->hispeed_freq) | |
377 | new_freq = tunables->hispeed_freq; | |
378 | } | |
379 | } else { | |
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; | |
384 | } | |
385 | ||
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); | |
394 | goto rearm; | |
395 | } | |
396 | ||
397 | pcpu->hispeed_validate_time = now; | |
398 | ||
399 | if (cpufreq_frequency_table_target(pcpu->policy, pcpu->freq_table, | |
400 | new_freq, CPUFREQ_RELATION_L, | |
401 | &index)) { | |
402 | spin_unlock_irqrestore(&pcpu->target_freq_lock, flags); | |
403 | goto rearm; | |
404 | } | |
405 | ||
406 | new_freq = pcpu->freq_table[index].frequency; | |
407 | ||
408 | /* | |
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. | |
411 | */ | |
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); | |
419 | goto rearm; | |
420 | } | |
421 | } | |
422 | ||
423 | /* | |
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). | |
429 | */ | |
430 | ||
431 | if (!boosted || new_freq > tunables->hispeed_freq) { | |
432 | pcpu->floor_freq = new_freq; | |
433 | pcpu->floor_validate_time = now; | |
434 | } | |
435 | ||
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; | |
442 | } | |
443 | ||
444 | trace_cpufreq_interactive_target(data, cpu_load, pcpu->target_freq, | |
445 | pcpu->policy->cur, new_freq); | |
446 | ||
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); | |
453 | ||
454 | rearm_if_notmax: | |
455 | /* | |
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. | |
458 | */ | |
459 | if (pcpu->target_freq == pcpu->policy->max) | |
460 | goto exit; | |
461 | ||
462 | rearm: | |
463 | if (!timer_pending(&pcpu->cpu_timer)) | |
464 | cpufreq_interactive_timer_resched(pcpu); | |
465 | ||
466 | exit: | |
467 | up_read(&pcpu->enable_sem); | |
468 | return; | |
469 | } | |
470 | ||
471 | static void cpufreq_interactive_idle_start(void) | |
472 | { | |
473 | struct cpufreq_interactive_cpuinfo *pcpu = | |
474 | &per_cpu(cpuinfo, smp_processor_id()); | |
475 | int pending; | |
476 | ||
477 | if (!down_read_trylock(&pcpu->enable_sem)) | |
478 | return; | |
479 | if (!pcpu->governor_enabled) { | |
480 | up_read(&pcpu->enable_sem); | |
481 | return; | |
482 | } | |
483 | ||
484 | pending = timer_pending(&pcpu->cpu_timer); | |
485 | ||
486 | if (pcpu->target_freq != pcpu->policy->min) { | |
487 | /* | |
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. | |
494 | */ | |
495 | if (!pending) | |
496 | cpufreq_interactive_timer_resched(pcpu); | |
497 | } | |
498 | ||
499 | up_read(&pcpu->enable_sem); | |
500 | } | |
501 | ||
502 | static void cpufreq_interactive_idle_end(void) | |
503 | { | |
504 | struct cpufreq_interactive_cpuinfo *pcpu = | |
505 | &per_cpu(cpuinfo, smp_processor_id()); | |
506 | ||
507 | if (!down_read_trylock(&pcpu->enable_sem)) | |
508 | return; | |
509 | if (!pcpu->governor_enabled) { | |
510 | up_read(&pcpu->enable_sem); | |
511 | return; | |
512 | } | |
513 | ||
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()); | |
521 | } | |
522 | ||
523 | up_read(&pcpu->enable_sem); | |
524 | } | |
525 | ||
526 | static int cpufreq_interactive_speedchange_task(void *data) | |
527 | { | |
528 | unsigned int cpu; | |
529 | cpumask_t tmp_mask; | |
530 | unsigned long flags; | |
531 | struct cpufreq_interactive_cpuinfo *pcpu; | |
532 | ||
533 | while (1) { | |
534 | set_current_state(TASK_INTERRUPTIBLE); | |
535 | spin_lock_irqsave(&speedchange_cpumask_lock, flags); | |
536 | ||
537 | if (cpumask_empty(&speedchange_cpumask)) { | |
538 | spin_unlock_irqrestore(&speedchange_cpumask_lock, | |
539 | flags); | |
540 | schedule(); | |
541 | ||
542 | if (kthread_should_stop()) | |
543 | break; | |
544 | ||
545 | spin_lock_irqsave(&speedchange_cpumask_lock, flags); | |
546 | } | |
547 | ||
548 | set_current_state(TASK_RUNNING); | |
549 | tmp_mask = speedchange_cpumask; | |
550 | cpumask_clear(&speedchange_cpumask); | |
551 | spin_unlock_irqrestore(&speedchange_cpumask_lock, flags); | |
552 | ||
553 | for_each_cpu(cpu, &tmp_mask) { | |
554 | unsigned int j; | |
555 | unsigned int max_freq = 0; | |
556 | ||
557 | pcpu = &per_cpu(cpuinfo, cpu); | |
558 | if (!down_read_trylock(&pcpu->enable_sem)) | |
559 | continue; | |
560 | if (!pcpu->governor_enabled) { | |
561 | up_read(&pcpu->enable_sem); | |
562 | continue; | |
563 | } | |
564 | ||
565 | for_each_cpu(j, pcpu->policy->cpus) { | |
566 | struct cpufreq_interactive_cpuinfo *pjcpu = | |
567 | &per_cpu(cpuinfo, j); | |
568 | ||
569 | if (pjcpu->target_freq > max_freq) | |
570 | max_freq = pjcpu->target_freq; | |
571 | } | |
572 | ||
573 | if (max_freq != pcpu->policy->cur) | |
574 | __cpufreq_driver_target(pcpu->policy, | |
575 | max_freq, | |
576 | CPUFREQ_RELATION_H); | |
577 | trace_cpufreq_interactive_setspeed(cpu, | |
578 | pcpu->target_freq, | |
579 | pcpu->policy->cur); | |
580 | ||
581 | up_read(&pcpu->enable_sem); | |
582 | } | |
583 | } | |
584 | ||
585 | return 0; | |
586 | } | |
587 | ||
588 | static void cpufreq_interactive_boost(void) | |
589 | { | |
590 | int i; | |
591 | int anyboost = 0; | |
592 | unsigned long flags[2]; | |
593 | struct cpufreq_interactive_cpuinfo *pcpu; | |
594 | struct cpufreq_interactive_tunables *tunables; | |
595 | ||
596 | spin_lock_irqsave(&speedchange_cpumask_lock, flags[0]); | |
597 | ||
598 | for_each_online_cpu(i) { | |
599 | pcpu = &per_cpu(cpuinfo, i); | |
600 | tunables = pcpu->policy->governor_data; | |
601 | ||
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()); | |
608 | anyboost = 1; | |
609 | } | |
610 | ||
611 | /* | |
612 | * Set floor freq and (re)start timer for when last | |
613 | * validated. | |
614 | */ | |
615 | ||
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]); | |
619 | } | |
620 | ||
621 | spin_unlock_irqrestore(&speedchange_cpumask_lock, flags[0]); | |
622 | ||
623 | if (anyboost) | |
624 | wake_up_process(speedchange_task); | |
625 | } | |
626 | ||
627 | static int cpufreq_interactive_notifier( | |
628 | struct notifier_block *nb, unsigned long val, void *data) | |
629 | { | |
630 | struct cpufreq_freqs *freq = data; | |
631 | struct cpufreq_interactive_cpuinfo *pcpu; | |
632 | int cpu; | |
633 | unsigned long flags; | |
634 | ||
635 | if (val == CPUFREQ_POSTCHANGE) { | |
636 | pcpu = &per_cpu(cpuinfo, freq->cpu); | |
637 | if (!down_read_trylock(&pcpu->enable_sem)) | |
638 | return 0; | |
639 | if (!pcpu->governor_enabled) { | |
640 | up_read(&pcpu->enable_sem); | |
641 | return 0; | |
642 | } | |
643 | ||
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)) | |
649 | continue; | |
650 | if (!pjcpu->governor_enabled) { | |
651 | up_read(&pjcpu->enable_sem); | |
652 | continue; | |
653 | } | |
654 | } | |
655 | spin_lock_irqsave(&pjcpu->load_lock, flags); | |
656 | update_load(cpu); | |
657 | spin_unlock_irqrestore(&pjcpu->load_lock, flags); | |
658 | if (cpu != freq->cpu) | |
659 | up_read(&pjcpu->enable_sem); | |
660 | } | |
661 | ||
662 | up_read(&pcpu->enable_sem); | |
663 | } | |
664 | return 0; | |
665 | } | |
666 | ||
667 | static struct notifier_block cpufreq_notifier_block = { | |
668 | .notifier_call = cpufreq_interactive_notifier, | |
669 | }; | |
670 | ||
671 | static unsigned int *get_tokenized_data(const char *buf, int *num_tokens) | |
672 | { | |
673 | const char *cp; | |
674 | int i; | |
675 | int ntokens = 1; | |
676 | unsigned int *tokenized_data; | |
677 | int err = -EINVAL; | |
678 | ||
679 | cp = buf; | |
680 | while ((cp = strpbrk(cp + 1, " :"))) | |
681 | ntokens++; | |
682 | ||
683 | if (!(ntokens & 0x1)) | |
684 | goto err; | |
685 | ||
686 | tokenized_data = kmalloc(ntokens * sizeof(unsigned int), GFP_KERNEL); | |
687 | if (!tokenized_data) { | |
688 | err = -ENOMEM; | |
689 | goto err; | |
690 | } | |
691 | ||
692 | cp = buf; | |
693 | i = 0; | |
694 | while (i < ntokens) { | |
695 | if (sscanf(cp, "%u", &tokenized_data[i++]) != 1) | |
696 | goto err_kfree; | |
697 | ||
698 | cp = strpbrk(cp, " :"); | |
699 | if (!cp) | |
700 | break; | |
701 | cp++; | |
702 | } | |
703 | ||
704 | if (i != ntokens) | |
705 | goto err_kfree; | |
706 | ||
707 | *num_tokens = ntokens; | |
708 | return tokenized_data; | |
709 | ||
710 | err_kfree: | |
711 | kfree(tokenized_data); | |
712 | err: | |
713 | return ERR_PTR(err); | |
714 | } | |
715 | ||
716 | static ssize_t show_target_loads( | |
717 | struct cpufreq_interactive_tunables *tunables, | |
718 | char *buf) | |
719 | { | |
720 | int i; | |
721 | ssize_t ret = 0; | |
722 | unsigned long flags; | |
723 | ||
724 | spin_lock_irqsave(&tunables->target_loads_lock, flags); | |
725 | ||
726 | for (i = 0; i < tunables->ntarget_loads; i++) | |
727 | ret += sprintf(buf + ret, "%u%s", tunables->target_loads[i], | |
728 | i & 0x1 ? ":" : " "); | |
729 | ||
730 | ret += sprintf(buf + --ret, "\n"); | |
731 | spin_unlock_irqrestore(&tunables->target_loads_lock, flags); | |
732 | return ret; | |
733 | } | |
734 | ||
735 | static ssize_t store_target_loads( | |
736 | struct cpufreq_interactive_tunables *tunables, | |
737 | const char *buf, size_t count) | |
738 | { | |
739 | int ntokens; | |
740 | unsigned int *new_target_loads = NULL; | |
741 | unsigned long flags; | |
742 | ||
743 | new_target_loads = get_tokenized_data(buf, &ntokens); | |
744 | if (IS_ERR(new_target_loads)) | |
745 | return PTR_RET(new_target_loads); | |
746 | ||
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); | |
753 | return count; | |
754 | } | |
755 | ||
756 | static ssize_t show_above_hispeed_delay( | |
757 | struct cpufreq_interactive_tunables *tunables, char *buf) | |
758 | { | |
759 | int i; | |
760 | ssize_t ret = 0; | |
761 | unsigned long flags; | |
762 | ||
763 | spin_lock_irqsave(&tunables->above_hispeed_delay_lock, flags); | |
764 | ||
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 ? ":" : " "); | |
769 | ||
770 | ret += sprintf(buf + --ret, "\n"); | |
771 | spin_unlock_irqrestore(&tunables->above_hispeed_delay_lock, flags); | |
772 | return ret; | |
773 | } | |
774 | ||
775 | static ssize_t store_above_hispeed_delay( | |
776 | struct cpufreq_interactive_tunables *tunables, | |
777 | const char *buf, size_t count) | |
778 | { | |
779 | int ntokens; | |
780 | unsigned int *new_above_hispeed_delay = NULL; | |
781 | unsigned long flags; | |
782 | ||
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); | |
786 | ||
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); | |
793 | return count; | |
794 | ||
795 | } | |
796 | ||
797 | static ssize_t show_hispeed_freq(struct cpufreq_interactive_tunables *tunables, | |
798 | char *buf) | |
799 | { | |
800 | return sprintf(buf, "%u\n", tunables->hispeed_freq); | |
801 | } | |
802 | ||
803 | static ssize_t store_hispeed_freq(struct cpufreq_interactive_tunables *tunables, | |
804 | const char *buf, size_t count) | |
805 | { | |
806 | int ret; | |
807 | long unsigned int val; | |
808 | ||
809 | ret = strict_strtoul(buf, 0, &val); | |
810 | if (ret < 0) | |
811 | return ret; | |
812 | tunables->hispeed_freq = val; | |
813 | return count; | |
814 | } | |
815 | ||
816 | static ssize_t show_go_hispeed_load(struct cpufreq_interactive_tunables | |
817 | *tunables, char *buf) | |
818 | { | |
819 | return sprintf(buf, "%lu\n", tunables->go_hispeed_load); | |
820 | } | |
821 | ||
822 | static ssize_t store_go_hispeed_load(struct cpufreq_interactive_tunables | |
823 | *tunables, const char *buf, size_t count) | |
824 | { | |
825 | int ret; | |
826 | unsigned long val; | |
827 | ||
828 | ret = strict_strtoul(buf, 0, &val); | |
829 | if (ret < 0) | |
830 | return ret; | |
831 | tunables->go_hispeed_load = val; | |
832 | return count; | |
833 | } | |
834 | ||
835 | static ssize_t show_min_sample_time(struct cpufreq_interactive_tunables | |
836 | *tunables, char *buf) | |
837 | { | |
838 | return sprintf(buf, "%lu\n", tunables->min_sample_time); | |
839 | } | |
840 | ||
841 | static ssize_t store_min_sample_time(struct cpufreq_interactive_tunables | |
842 | *tunables, const char *buf, size_t count) | |
843 | { | |
844 | int ret; | |
845 | unsigned long val; | |
846 | ||
847 | ret = strict_strtoul(buf, 0, &val); | |
848 | if (ret < 0) | |
849 | return ret; | |
850 | tunables->min_sample_time = val; | |
851 | return count; | |
852 | } | |
853 | ||
854 | static ssize_t show_timer_rate(struct cpufreq_interactive_tunables *tunables, | |
855 | char *buf) | |
856 | { | |
857 | return sprintf(buf, "%lu\n", tunables->timer_rate); | |
858 | } | |
859 | ||
860 | static ssize_t store_timer_rate(struct cpufreq_interactive_tunables *tunables, | |
861 | const char *buf, size_t count) | |
862 | { | |
863 | int ret; | |
864 | unsigned long val; | |
865 | ||
866 | ret = strict_strtoul(buf, 0, &val); | |
867 | if (ret < 0) | |
868 | return ret; | |
869 | tunables->timer_rate = val; | |
870 | return count; | |
871 | } | |
872 | ||
873 | static ssize_t show_timer_slack(struct cpufreq_interactive_tunables *tunables, | |
874 | char *buf) | |
875 | { | |
876 | return sprintf(buf, "%d\n", tunables->timer_slack_val); | |
877 | } | |
878 | ||
879 | static ssize_t store_timer_slack(struct cpufreq_interactive_tunables *tunables, | |
880 | const char *buf, size_t count) | |
881 | { | |
882 | int ret; | |
883 | unsigned long val; | |
884 | ||
885 | ret = kstrtol(buf, 10, &val); | |
886 | if (ret < 0) | |
887 | return ret; | |
888 | ||
889 | tunables->timer_slack_val = val; | |
890 | return count; | |
891 | } | |
892 | ||
893 | static ssize_t show_boost(struct cpufreq_interactive_tunables *tunables, | |
894 | char *buf) | |
895 | { | |
896 | return sprintf(buf, "%d\n", tunables->boost_val); | |
897 | } | |
898 | ||
899 | static ssize_t store_boost(struct cpufreq_interactive_tunables *tunables, | |
900 | const char *buf, size_t count) | |
901 | { | |
902 | int ret; | |
903 | unsigned long val; | |
904 | ||
905 | ret = kstrtoul(buf, 0, &val); | |
906 | if (ret < 0) | |
907 | return ret; | |
908 | ||
909 | tunables->boost_val = val; | |
910 | ||
911 | if (tunables->boost_val) { | |
912 | trace_cpufreq_interactive_boost("on"); | |
913 | cpufreq_interactive_boost(); | |
914 | } else { | |
915 | tunables->boostpulse_endtime = ktime_to_us(ktime_get()); | |
916 | trace_cpufreq_interactive_unboost("off"); | |
917 | } | |
918 | ||
919 | return count; | |
920 | } | |
921 | ||
922 | static ssize_t store_boostpulse(struct cpufreq_interactive_tunables *tunables, | |
923 | const char *buf, size_t count) | |
924 | { | |
925 | int ret; | |
926 | unsigned long val; | |
927 | ||
928 | ret = kstrtoul(buf, 0, &val); | |
929 | if (ret < 0) | |
930 | return ret; | |
931 | ||
932 | tunables->boostpulse_endtime = ktime_to_us(ktime_get()) + | |
933 | tunables->boostpulse_duration_val; | |
934 | trace_cpufreq_interactive_boost("pulse"); | |
935 | cpufreq_interactive_boost(); | |
936 | return count; | |
937 | } | |
938 | ||
939 | static ssize_t show_boostpulse_duration(struct cpufreq_interactive_tunables | |
940 | *tunables, char *buf) | |
941 | { | |
942 | return sprintf(buf, "%d\n", tunables->boostpulse_duration_val); | |
943 | } | |
944 | ||
945 | static ssize_t store_boostpulse_duration(struct cpufreq_interactive_tunables | |
946 | *tunables, const char *buf, size_t count) | |
947 | { | |
948 | int ret; | |
949 | unsigned long val; | |
950 | ||
951 | ret = kstrtoul(buf, 0, &val); | |
952 | if (ret < 0) | |
953 | return ret; | |
954 | ||
955 | tunables->boostpulse_duration_val = val; | |
956 | return count; | |
957 | } | |
958 | ||
959 | static ssize_t show_io_is_busy(struct cpufreq_interactive_tunables *tunables, | |
960 | char *buf) | |
961 | { | |
962 | return sprintf(buf, "%u\n", tunables->io_is_busy); | |
963 | } | |
964 | ||
965 | static ssize_t store_io_is_busy(struct cpufreq_interactive_tunables *tunables, | |
966 | const char *buf, size_t count) | |
967 | { | |
968 | int ret; | |
969 | unsigned long val; | |
970 | ||
971 | ret = kstrtoul(buf, 0, &val); | |
972 | if (ret < 0) | |
973 | return ret; | |
974 | tunables->io_is_busy = val; | |
975 | return count; | |
976 | } | |
977 | ||
978 | /* | |
979 | * Create show/store routines | |
980 | * - sys: One governor instance for complete SYSTEM | |
981 | * - pol: One governor instance per struct cpufreq_policy | |
982 | */ | |
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) \ | |
986 | { \ | |
987 | return show_##file_name(common_tunables, buf); \ | |
988 | } \ | |
989 | \ | |
990 | static ssize_t show_##file_name##_gov_pol \ | |
991 | (struct cpufreq_policy *policy, char *buf) \ | |
992 | { \ | |
993 | return show_##file_name(policy->governor_data, buf); \ | |
994 | } | |
995 | ||
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, \ | |
999 | size_t count) \ | |
1000 | { \ | |
1001 | return store_##file_name(common_tunables, buf, count); \ | |
1002 | } \ | |
1003 | \ | |
1004 | static ssize_t store_##file_name##_gov_pol \ | |
1005 | (struct cpufreq_policy *policy, const char *buf, size_t count) \ | |
1006 | { \ | |
1007 | return store_##file_name(policy->governor_data, buf, count); \ | |
1008 | } | |
1009 | ||
1010 | #define show_store_gov_pol_sys(file_name) \ | |
1011 | show_gov_pol_sys(file_name); \ | |
1012 | store_gov_pol_sys(file_name) | |
1013 | ||
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); | |
1025 | ||
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) | |
1029 | ||
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) | |
1033 | ||
1034 | #define gov_sys_pol_attr_rw(_name) \ | |
1035 | gov_sys_attr_rw(_name); \ | |
1036 | gov_pol_attr_rw(_name) | |
1037 | ||
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); | |
1048 | ||
1049 | static struct global_attr boostpulse_gov_sys = | |
1050 | __ATTR(boostpulse, 0200, NULL, store_boostpulse_gov_sys); | |
1051 | ||
1052 | static struct freq_attr boostpulse_gov_pol = | |
1053 | __ATTR(boostpulse, 0200, NULL, store_boostpulse_gov_pol); | |
1054 | ||
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, | |
1068 | NULL, | |
1069 | }; | |
1070 | ||
1071 | static struct attribute_group interactive_attr_group_gov_sys = { | |
1072 | .attrs = interactive_attributes_gov_sys, | |
1073 | .name = "interactive", | |
1074 | }; | |
1075 | ||
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, | |
1089 | NULL, | |
1090 | }; | |
1091 | ||
1092 | static struct attribute_group interactive_attr_group_gov_pol = { | |
1093 | .attrs = interactive_attributes_gov_pol, | |
1094 | .name = "interactive", | |
1095 | }; | |
1096 | ||
1097 | static struct attribute_group *get_sysfs_attr(void) | |
1098 | { | |
1099 | if (have_governor_per_policy()) | |
1100 | return &interactive_attr_group_gov_pol; | |
1101 | else | |
1102 | return &interactive_attr_group_gov_sys; | |
1103 | } | |
1104 | ||
1105 | static int cpufreq_interactive_idle_notifier(struct notifier_block *nb, | |
1106 | unsigned long val, | |
1107 | void *data) | |
1108 | { | |
1109 | switch (val) { | |
1110 | case IDLE_START: | |
1111 | cpufreq_interactive_idle_start(); | |
1112 | break; | |
1113 | case IDLE_END: | |
1114 | cpufreq_interactive_idle_end(); | |
1115 | break; | |
1116 | } | |
1117 | ||
1118 | return 0; | |
1119 | } | |
1120 | ||
1121 | static struct notifier_block cpufreq_interactive_idle_nb = { | |
1122 | .notifier_call = cpufreq_interactive_idle_notifier, | |
1123 | }; | |
1124 | ||
1125 | static int cpufreq_governor_interactive(struct cpufreq_policy *policy, | |
1126 | unsigned int event) | |
1127 | { | |
1128 | int rc; | |
1129 | unsigned int j; | |
1130 | struct cpufreq_interactive_cpuinfo *pcpu; | |
1131 | struct cpufreq_frequency_table *freq_table; | |
1132 | struct cpufreq_interactive_tunables *tunables; | |
1133 | unsigned long flags; | |
1134 | ||
1135 | if (have_governor_per_policy()) | |
1136 | tunables = policy->governor_data; | |
1137 | else | |
1138 | tunables = common_tunables; | |
1139 | ||
1140 | WARN_ON(!tunables && (event != CPUFREQ_GOV_POLICY_INIT)); | |
1141 | ||
1142 | switch (event) { | |
1143 | case CPUFREQ_GOV_POLICY_INIT: | |
1144 | if (have_governor_per_policy()) { | |
1145 | WARN_ON(tunables); | |
1146 | } else if (tunables) { | |
1147 | tunables->usage_count++; | |
1148 | policy->governor_data = tunables; | |
1149 | return 0; | |
1150 | } | |
1151 | ||
1152 | tunables = kzalloc(sizeof(*tunables), GFP_KERNEL); | |
1153 | if (!tunables) { | |
1154 | pr_err("%s: POLICY_INIT: kzalloc failed\n", __func__); | |
1155 | return -ENOMEM; | |
1156 | } | |
1157 | ||
1158 | rc = sysfs_create_group(get_governor_parent_kobj(policy), | |
1159 | get_sysfs_attr()); | |
1160 | if (rc) { | |
1161 | kfree(tunables); | |
1162 | return rc; | |
1163 | } | |
1164 | ||
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; | |
1176 | ||
1177 | spin_lock_init(&tunables->target_loads_lock); | |
1178 | spin_lock_init(&tunables->above_hispeed_delay_lock); | |
1179 | ||
1180 | if (!policy->governor->initialized) { | |
1181 | idle_notifier_register(&cpufreq_interactive_idle_nb); | |
1182 | cpufreq_register_notifier(&cpufreq_notifier_block, | |
1183 | CPUFREQ_TRANSITION_NOTIFIER); | |
1184 | } | |
1185 | ||
1186 | policy->governor_data = tunables; | |
1187 | if (!have_governor_per_policy()) | |
1188 | common_tunables = tunables; | |
1189 | ||
1190 | break; | |
1191 | ||
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); | |
1198 | } | |
1199 | ||
1200 | sysfs_remove_group(get_governor_parent_kobj(policy), | |
1201 | get_sysfs_attr()); | |
1202 | kfree(tunables); | |
1203 | common_tunables = NULL; | |
1204 | } | |
1205 | ||
1206 | policy->governor_data = NULL; | |
1207 | break; | |
1208 | ||
1209 | case CPUFREQ_GOV_START: | |
1210 | mutex_lock(&gov_lock); | |
1211 | ||
1212 | freq_table = cpufreq_frequency_get_table(policy->cpu); | |
1213 | if (!tunables->hispeed_freq) | |
1214 | tunables->hispeed_freq = policy->max; | |
1215 | ||
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); | |
1233 | } | |
1234 | ||
1235 | mutex_unlock(&gov_lock); | |
1236 | break; | |
1237 | ||
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); | |
1247 | } | |
1248 | ||
1249 | mutex_unlock(&gov_lock); | |
1250 | break; | |
1251 | ||
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); | |
1261 | ||
1262 | down_read(&pcpu->enable_sem); | |
1263 | if (pcpu->governor_enabled == 0) { | |
1264 | up_read(&pcpu->enable_sem); | |
1265 | continue; | |
1266 | } | |
1267 | ||
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; | |
1273 | ||
1274 | spin_unlock_irqrestore(&pcpu->target_freq_lock, flags); | |
1275 | up_read(&pcpu->enable_sem); | |
1276 | ||
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. | |
1282 | */ | |
1283 | ||
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); | |
1290 | } | |
1291 | ||
1292 | pcpu->max_freq = policy->max; | |
1293 | } | |
1294 | break; | |
1295 | } | |
1296 | return 0; | |
1297 | } | |
1298 | ||
1299 | #ifndef CONFIG_CPU_FREQ_DEFAULT_GOV_INTERACTIVE | |
1300 | static | |
1301 | #endif | |
1302 | struct cpufreq_governor cpufreq_gov_interactive = { | |
1303 | .name = "interactive", | |
1304 | .governor = cpufreq_governor_interactive, | |
1305 | .max_transition_latency = 10000000, | |
1306 | .owner = THIS_MODULE, | |
1307 | }; | |
1308 | ||
1309 | static void cpufreq_interactive_nop_timer(unsigned long data) | |
1310 | { | |
1311 | } | |
1312 | ||
1313 | static int __init cpufreq_interactive_init(void) | |
1314 | { | |
1315 | unsigned int i; | |
1316 | struct cpufreq_interactive_cpuinfo *pcpu; | |
1317 | struct sched_param param = { .sched_priority = MAX_RT_PRIO-1 }; | |
1318 | ||
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); | |
1330 | } | |
1331 | ||
1332 | spin_lock_init(&speedchange_cpumask_lock); | |
1333 | mutex_init(&gov_lock); | |
1334 | speedchange_task = | |
1335 | kthread_create(cpufreq_interactive_speedchange_task, NULL, | |
1336 | "cfinteractive"); | |
1337 | if (IS_ERR(speedchange_task)) | |
1338 | return PTR_ERR(speedchange_task); | |
1339 | ||
1340 | sched_setscheduler_nocheck(speedchange_task, SCHED_FIFO, ¶m); | |
1341 | get_task_struct(speedchange_task); | |
1342 | ||
1343 | /* NB: wake up so the thread does not look hung to the freezer */ | |
1344 | wake_up_process(speedchange_task); | |
1345 | ||
1346 | return cpufreq_register_governor(&cpufreq_gov_interactive); | |
1347 | } | |
1348 | ||
1349 | #ifdef CONFIG_CPU_FREQ_DEFAULT_GOV_INTERACTIVE | |
1350 | fs_initcall(cpufreq_interactive_init); | |
1351 | #else | |
1352 | module_init(cpufreq_interactive_init); | |
1353 | #endif | |
1354 | ||
1355 | static void __exit cpufreq_interactive_exit(void) | |
1356 | { | |
1357 | cpufreq_unregister_governor(&cpufreq_gov_interactive); | |
1358 | kthread_stop(speedchange_task); | |
1359 | put_task_struct(speedchange_task); | |
1360 | } | |
1361 | ||
1362 | module_exit(cpufreq_interactive_exit); | |
1363 | ||
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"); |