Commit | Line | Data |
---|---|---|
6fa3eb70 S |
1 | /* |
2 | * drivers/cpufreq/cpufreq_hotplug.c | |
3 | * | |
4 | * Copyright (C) 2001 Russell King | |
5 | * (C) 2003 Venkatesh Pallipadi <venkatesh.pallipadi@intel.com>. | |
6 | * Jun Nakajima <jun.nakajima@intel.com> | |
7 | * | |
8 | * This program is free software; you can redistribute it and/or modify | |
9 | * it under the terms of the GNU General Public License version 2 as | |
10 | * published by the Free Software Foundation. | |
11 | */ | |
12 | ||
13 | #include <linux/kernel.h> | |
14 | #include <linux/module.h> | |
15 | #include <linux/init.h> | |
16 | #include <linux/cpufreq.h> | |
17 | #include <linux/cpu.h> | |
18 | #include <linux/jiffies.h> | |
19 | #include <linux/kernel_stat.h> | |
20 | #include <linux/mutex.h> | |
21 | #include <linux/hrtimer.h> | |
22 | #include <linux/tick.h> | |
23 | #include <linux/ktime.h> | |
24 | #include <linux/sched.h> | |
25 | #include <linux/input.h> | |
26 | #include <linux/slab.h> | |
27 | #include <linux/sched/rt.h> | |
28 | #include <linux/kthread.h> | |
29 | ||
30 | extern unsigned int get_normal_max_freq(void); | |
31 | extern unsigned int mt_dvfs_power_dispatch_safe(void); | |
32 | extern int mt_gpufreq_target(int idx); | |
33 | /* | |
34 | * dbs is used in this file as a shortform for demandbased switching | |
35 | * It helps to keep variable names smaller, simpler | |
36 | */ | |
37 | ||
38 | #define DEF_FREQUENCY_DOWN_DIFFERENTIAL (10) | |
39 | #define DEF_FREQUENCY_OD_THRESHOLD (98) | |
40 | #define DEF_FREQUENCY_UP_THRESHOLD (80) | |
41 | #define DEF_SAMPLING_DOWN_FACTOR (1) | |
42 | #define MAX_SAMPLING_DOWN_FACTOR (100000) | |
43 | #define MICRO_FREQUENCY_DOWN_DIFFERENTIAL (15) | |
44 | #define MIN_FREQUENCY_DOWN_DIFFERENTIAL (5) | |
45 | #define MAX_FREQUENCY_DOWN_DIFFERENTIAL (20) | |
46 | #define MICRO_FREQUENCY_UP_THRESHOLD (85) | |
47 | #define MICRO_FREQUENCY_MIN_SAMPLE_RATE (30000) | |
48 | #define MIN_FREQUENCY_UP_THRESHOLD (21) | |
49 | #define MAX_FREQUENCY_UP_THRESHOLD (100) | |
50 | ||
51 | #define DEF_CPU_DOWN_DIFFERENTIAL (10) | |
52 | #define MICRO_CPU_DOWN_DIFFERENTIAL (10) | |
53 | #define MIN_CPU_DOWN_DIFFERENTIAL (0) | |
54 | #define MAX_CPU_DOWN_DIFFERENTIAL (30) | |
55 | ||
56 | #define DEF_CPU_UP_THRESHOLD (90) | |
57 | #define MICRO_CPU_UP_THRESHOLD (90) | |
58 | #define MIN_CPU_UP_THRESHOLD (80) | |
59 | #define MAX_CPU_UP_THRESHOLD (100) | |
60 | ||
61 | #define CPU_UP_AVG_TIMES (10) | |
62 | #define CPU_DOWN_AVG_TIMES (50) | |
63 | #define THERMAL_DISPATCH_AVG_TIMES (30) | |
64 | ||
65 | #define DEF_CPU_PERSIST_COUNT (10) | |
66 | ||
67 | //#define DEBUG_LOG | |
68 | #define INPUT_BOOST (1) | |
69 | ||
70 | /* | |
71 | * The polling frequency of this governor depends on the capability of | |
72 | * the processor. Default polling frequency is 1000 times the transition | |
73 | * latency of the processor. The governor will work on any processor with | |
74 | * transition latency <= 10mS, using appropriate sampling | |
75 | * rate. | |
76 | * For CPUs with transition latency > 10mS (mostly drivers with CPUFREQ_ETERNAL) | |
77 | * this governor will not work. | |
78 | * All times here are in uS. | |
79 | */ | |
80 | #define MIN_SAMPLING_RATE_RATIO (2) | |
81 | ||
82 | static unsigned int min_sampling_rate; | |
83 | ||
84 | #define LATENCY_MULTIPLIER (1000) | |
85 | #define MIN_LATENCY_MULTIPLIER (100) | |
86 | #define TRANSITION_LATENCY_LIMIT (10 * 1000 * 1000) | |
87 | ||
88 | static void do_dbs_timer(struct work_struct *work); | |
89 | static int cpufreq_governor_dbs(struct cpufreq_policy *policy, | |
90 | unsigned int event); | |
91 | ||
92 | #ifndef CONFIG_CPU_FREQ_DEFAULT_GOV_BALANCE | |
93 | static | |
94 | #endif | |
95 | struct cpufreq_governor cpufreq_gov_balance = { | |
96 | .name = "hotplug", | |
97 | .governor = cpufreq_governor_dbs, | |
98 | .max_transition_latency = TRANSITION_LATENCY_LIMIT, | |
99 | .owner = THIS_MODULE, | |
100 | }; | |
101 | ||
102 | #ifdef CONFIG_SMP | |
103 | ||
104 | static int g_next_hp_action = 0; | |
105 | ||
106 | static long g_cpu_up_sum_load = 0; | |
107 | static int g_cpu_up_count = 0; | |
108 | ||
109 | static long g_cpu_down_sum_load = 0; | |
110 | static int g_cpu_down_count = 0; | |
111 | static int g_max_cpu_persist_count = 0; | |
112 | static int g_thermal_count = 0; | |
113 | ||
114 | static void hp_work_handler(struct work_struct *work); | |
115 | static struct delayed_work hp_work; | |
116 | ||
117 | #if INPUT_BOOST | |
118 | static struct task_struct *freq_up_task; | |
119 | #endif | |
120 | ||
121 | #endif | |
122 | ||
123 | static int cpu_loading = 0; | |
124 | static int cpus_sum_load = 0; | |
125 | /* Sampling types */ | |
126 | enum {DBS_NORMAL_SAMPLE, DBS_SUB_SAMPLE}; | |
127 | ||
128 | struct cpu_dbs_info_s { | |
129 | cputime64_t prev_cpu_idle; | |
130 | cputime64_t prev_cpu_iowait; | |
131 | cputime64_t prev_cpu_wall; | |
132 | cputime64_t prev_cpu_nice; | |
133 | struct cpufreq_policy *cur_policy; | |
134 | struct delayed_work work; | |
135 | struct cpufreq_frequency_table *freq_table; | |
136 | unsigned int freq_lo; | |
137 | unsigned int freq_lo_jiffies; | |
138 | unsigned int freq_hi_jiffies; | |
139 | unsigned int rate_mult; | |
140 | int cpu; | |
141 | unsigned int sample_type:1; | |
142 | /* | |
143 | * percpu mutex that serializes governor limit change with | |
144 | * do_dbs_timer invocation. We do not want do_dbs_timer to run | |
145 | * when user is changing the governor or limits. | |
146 | */ | |
147 | struct mutex timer_mutex; | |
148 | }; | |
149 | static DEFINE_PER_CPU(struct cpu_dbs_info_s, hp_cpu_dbs_info); | |
150 | ||
151 | static unsigned int dbs_enable; /* number of CPUs using this policy */ | |
152 | static unsigned int dbs_ignore = 1; | |
153 | static unsigned int dbs_thermal_limited; | |
154 | static unsigned int dbs_thermal_limited_freq; | |
155 | ||
156 | /* dvfs thermal limit */ | |
157 | void dbs_freq_thermal_limited(unsigned int limited, unsigned int freq) | |
158 | { | |
159 | dbs_thermal_limited = limited; | |
160 | dbs_thermal_limited_freq = freq; | |
161 | } | |
162 | EXPORT_SYMBOL(dbs_freq_thermal_limited); | |
163 | ||
164 | /* | |
165 | * dbs_mutex protects dbs_enable in governor start/stop. | |
166 | */ | |
167 | static DEFINE_MUTEX(dbs_mutex); | |
168 | ||
169 | /* | |
170 | * dbs_hotplug protects all hotplug related global variables | |
171 | */ | |
172 | static DEFINE_MUTEX(hp_mutex); | |
173 | ||
174 | DEFINE_MUTEX(bl_onoff_mutex); | |
175 | ||
176 | static struct dbs_tuners { | |
177 | unsigned int sampling_rate; | |
178 | unsigned int od_threshold; | |
179 | unsigned int up_threshold; | |
180 | unsigned int down_differential; | |
181 | unsigned int ignore_nice; | |
182 | unsigned int sampling_down_factor; | |
183 | unsigned int powersave_bias; | |
184 | unsigned int io_is_busy; | |
185 | unsigned int cpu_up_threshold; | |
186 | unsigned int cpu_down_differential; | |
187 | unsigned int cpu_up_avg_times; | |
188 | unsigned int cpu_down_avg_times; | |
189 | unsigned int thermal_dispatch_avg_times; | |
190 | unsigned int cpu_num_limit; | |
191 | unsigned int cpu_num_base; | |
192 | unsigned int is_cpu_hotplug_disable; | |
193 | #if INPUT_BOOST | |
194 | unsigned int cpu_input_boost_enable; | |
195 | #endif | |
196 | } dbs_tuners_ins = { | |
197 | .od_threshold = DEF_FREQUENCY_OD_THRESHOLD, | |
198 | .up_threshold = DEF_FREQUENCY_UP_THRESHOLD, | |
199 | .sampling_down_factor = DEF_SAMPLING_DOWN_FACTOR, | |
200 | .down_differential = DEF_FREQUENCY_DOWN_DIFFERENTIAL, | |
201 | .ignore_nice = 0, | |
202 | .powersave_bias = 0, | |
203 | .cpu_up_threshold = DEF_CPU_UP_THRESHOLD, | |
204 | .cpu_down_differential = DEF_CPU_DOWN_DIFFERENTIAL, | |
205 | .cpu_up_avg_times = CPU_UP_AVG_TIMES, | |
206 | .cpu_down_avg_times = CPU_DOWN_AVG_TIMES, | |
207 | .thermal_dispatch_avg_times = THERMAL_DISPATCH_AVG_TIMES, | |
208 | .cpu_num_limit = 1, | |
209 | .cpu_num_base = 1, | |
210 | .is_cpu_hotplug_disable = 1, | |
211 | #if INPUT_BOOST | |
212 | .cpu_input_boost_enable = 1, | |
213 | #endif | |
214 | }; | |
215 | ||
216 | static void dbs_freq_increase(struct cpufreq_policy *p, unsigned int freq); | |
217 | ||
218 | static inline u64 get_cpu_idle_time_jiffy(unsigned int cpu, u64 *wall) | |
219 | { | |
220 | u64 idle_time; | |
221 | u64 cur_wall_time; | |
222 | u64 busy_time; | |
223 | ||
224 | cur_wall_time = jiffies64_to_cputime64(get_jiffies_64()); | |
225 | ||
226 | busy_time = kcpustat_cpu(cpu).cpustat[CPUTIME_USER]; | |
227 | busy_time += kcpustat_cpu(cpu).cpustat[CPUTIME_SYSTEM]; | |
228 | busy_time += kcpustat_cpu(cpu).cpustat[CPUTIME_IRQ]; | |
229 | busy_time += kcpustat_cpu(cpu).cpustat[CPUTIME_SOFTIRQ]; | |
230 | busy_time += kcpustat_cpu(cpu).cpustat[CPUTIME_STEAL]; | |
231 | busy_time += kcpustat_cpu(cpu).cpustat[CPUTIME_NICE]; | |
232 | ||
233 | idle_time = cur_wall_time - busy_time; | |
234 | if (wall) | |
235 | *wall = jiffies_to_usecs(cur_wall_time); | |
236 | ||
237 | return jiffies_to_usecs(idle_time); | |
238 | } | |
239 | ||
240 | /* static inline cputime64_t get_cpu_idle_time(unsigned int cpu, cputime64_t *wall) */ | |
241 | /* { */ | |
242 | /* u64 idle_time = get_cpu_idle_time_us(cpu, NULL); */ | |
243 | ||
244 | /* if (idle_time == -1ULL) */ | |
245 | /* return get_cpu_idle_time_jiffy(cpu, wall); */ | |
246 | /* else */ | |
247 | /* idle_time += get_cpu_iowait_time_us(cpu, wall); */ | |
248 | ||
249 | /* return idle_time; */ | |
250 | /* } */ | |
251 | ||
252 | static inline cputime64_t get_cpu_iowait_time(unsigned int cpu, cputime64_t *wall) | |
253 | { | |
254 | u64 iowait_time = get_cpu_iowait_time_us(cpu, wall); | |
255 | ||
256 | if (iowait_time == -1ULL) | |
257 | return 0; | |
258 | ||
259 | return iowait_time; | |
260 | } | |
261 | ||
262 | void force_two_core(void) | |
263 | { | |
264 | bool raise_freq = false; | |
265 | ||
266 | mutex_lock(&hp_mutex); | |
267 | g_cpu_down_count = 0; | |
268 | g_cpu_down_sum_load = 0; | |
269 | if (num_online_cpus() < dbs_tuners_ins.cpu_num_limit) { | |
270 | raise_freq = true; | |
271 | g_next_hp_action = 1; | |
272 | schedule_delayed_work_on(0, &hp_work, 0); | |
273 | } | |
274 | mutex_unlock(&hp_mutex); | |
275 | ||
276 | if (raise_freq == true) { | |
277 | wake_up_process(freq_up_task); | |
278 | } | |
279 | ||
280 | mt_gpufreq_target(0); | |
281 | } | |
282 | ||
283 | /* | |
284 | * Find right freq to be set now with powersave_bias on. | |
285 | * Returns the freq_hi to be used right now and will set freq_hi_jiffies, | |
286 | * freq_lo, and freq_lo_jiffies in percpu area for averaging freqs. | |
287 | */ | |
288 | static unsigned int powersave_bias_target(struct cpufreq_policy *policy, | |
289 | unsigned int freq_next, | |
290 | unsigned int relation) | |
291 | { | |
292 | unsigned int freq_req, freq_reduc, freq_avg; | |
293 | unsigned int freq_hi, freq_lo; | |
294 | unsigned int index = 0; | |
295 | unsigned int jiffies_total, jiffies_hi, jiffies_lo; | |
296 | struct cpu_dbs_info_s *dbs_info = &per_cpu(hp_cpu_dbs_info, | |
297 | policy->cpu); | |
298 | ||
299 | if (!dbs_info->freq_table) { | |
300 | dbs_info->freq_lo = 0; | |
301 | dbs_info->freq_lo_jiffies = 0; | |
302 | return freq_next; | |
303 | } | |
304 | ||
305 | cpufreq_frequency_table_target(policy, dbs_info->freq_table, freq_next, | |
306 | relation, &index); | |
307 | freq_req = dbs_info->freq_table[index].frequency; | |
308 | freq_reduc = freq_req * dbs_tuners_ins.powersave_bias / 1000; | |
309 | freq_avg = freq_req - freq_reduc; | |
310 | ||
311 | /* Find freq bounds for freq_avg in freq_table */ | |
312 | index = 0; | |
313 | cpufreq_frequency_table_target(policy, dbs_info->freq_table, freq_avg, | |
314 | CPUFREQ_RELATION_H, &index); | |
315 | freq_lo = dbs_info->freq_table[index].frequency; | |
316 | index = 0; | |
317 | cpufreq_frequency_table_target(policy, dbs_info->freq_table, freq_avg, | |
318 | CPUFREQ_RELATION_L, &index); | |
319 | freq_hi = dbs_info->freq_table[index].frequency; | |
320 | ||
321 | /* Find out how long we have to be in hi and lo freqs */ | |
322 | if (freq_hi == freq_lo) { | |
323 | dbs_info->freq_lo = 0; | |
324 | dbs_info->freq_lo_jiffies = 0; | |
325 | return freq_lo; | |
326 | } | |
327 | jiffies_total = usecs_to_jiffies(dbs_tuners_ins.sampling_rate); | |
328 | jiffies_hi = (freq_avg - freq_lo) * jiffies_total; | |
329 | jiffies_hi += ((freq_hi - freq_lo) / 2); | |
330 | jiffies_hi /= (freq_hi - freq_lo); | |
331 | jiffies_lo = jiffies_total - jiffies_hi; | |
332 | dbs_info->freq_lo = freq_lo; | |
333 | dbs_info->freq_lo_jiffies = jiffies_lo; | |
334 | dbs_info->freq_hi_jiffies = jiffies_hi; | |
335 | return freq_hi; | |
336 | } | |
337 | ||
338 | static void hotplug_powersave_bias_init_cpu(int cpu) | |
339 | { | |
340 | struct cpu_dbs_info_s *dbs_info = &per_cpu(hp_cpu_dbs_info, cpu); | |
341 | dbs_info->freq_table = cpufreq_frequency_get_table(cpu); | |
342 | dbs_info->freq_lo = 0; | |
343 | } | |
344 | ||
345 | static void hotplug_powersave_bias_init(void) | |
346 | { | |
347 | int i; | |
348 | for_each_online_cpu(i) { | |
349 | hotplug_powersave_bias_init_cpu(i); | |
350 | } | |
351 | } | |
352 | ||
353 | /************************** sysfs interface ************************/ | |
354 | ||
355 | static ssize_t show_sampling_rate_min(struct kobject *kobj, | |
356 | struct attribute *attr, char *buf) | |
357 | { | |
358 | return sprintf(buf, "%u\n", min_sampling_rate); | |
359 | } | |
360 | ||
361 | define_one_global_ro(sampling_rate_min); | |
362 | ||
363 | /* cpufreq_hotplug Governor Tunables */ | |
364 | #define show_one(file_name, object) \ | |
365 | static ssize_t show_##file_name \ | |
366 | (struct kobject *kobj, struct attribute *attr, char *buf) \ | |
367 | { \ | |
368 | return sprintf(buf, "%u\n", dbs_tuners_ins.object); \ | |
369 | } | |
370 | ||
371 | show_one(sampling_rate, sampling_rate); | |
372 | show_one(io_is_busy, io_is_busy); | |
373 | show_one(up_threshold, up_threshold); | |
374 | show_one(od_threshold, od_threshold); | |
375 | show_one(down_differential, down_differential); | |
376 | show_one(sampling_down_factor, sampling_down_factor); | |
377 | show_one(ignore_nice_load, ignore_nice); | |
378 | show_one(powersave_bias, powersave_bias); | |
379 | show_one(cpu_up_threshold, cpu_up_threshold); | |
380 | show_one(cpu_down_differential, cpu_down_differential); | |
381 | show_one(cpu_up_avg_times, cpu_up_avg_times); | |
382 | show_one(cpu_down_avg_times, cpu_down_avg_times); | |
383 | show_one(thermal_dispatch_avg_times, thermal_dispatch_avg_times); | |
384 | show_one(cpu_num_limit, cpu_num_limit); | |
385 | show_one(cpu_num_base, cpu_num_base); | |
386 | show_one(is_cpu_hotplug_disable, is_cpu_hotplug_disable); | |
387 | #if INPUT_BOOST | |
388 | show_one(cpu_input_boost_enable, cpu_input_boost_enable); | |
389 | #endif | |
390 | ||
391 | /** | |
392 | * update_sampling_rate - update sampling rate effective immediately if needed. | |
393 | * @new_rate: new sampling rate | |
394 | * | |
395 | * If new rate is smaller than the old, simply updaing | |
396 | * dbs_tuners_int.sampling_rate might not be appropriate. For example, | |
397 | * if the original sampling_rate was 1 second and the requested new sampling | |
398 | * rate is 10 ms because the user needs immediate reaction from hotplug | |
399 | * governor, but not sure if higher frequency will be required or not, | |
400 | * then, the governor may change the sampling rate too late; up to 1 second | |
401 | * later. Thus, if we are reducing the sampling rate, we need to make the | |
402 | * new value effective immediately. | |
403 | */ | |
404 | static void update_sampling_rate(unsigned int new_rate) | |
405 | { | |
406 | int cpu; | |
407 | ||
408 | dbs_tuners_ins.sampling_rate = new_rate | |
409 | = max(new_rate, min_sampling_rate); | |
410 | ||
411 | for_each_online_cpu(cpu) { | |
412 | struct cpufreq_policy *policy; | |
413 | struct cpu_dbs_info_s *dbs_info; | |
414 | unsigned long next_sampling, appointed_at; | |
415 | ||
416 | policy = cpufreq_cpu_get(cpu); | |
417 | if (!policy) | |
418 | continue; | |
419 | dbs_info = &per_cpu(hp_cpu_dbs_info, policy->cpu); | |
420 | cpufreq_cpu_put(policy); | |
421 | ||
422 | mutex_lock(&dbs_info->timer_mutex); | |
423 | ||
424 | if (!delayed_work_pending(&dbs_info->work)) { | |
425 | mutex_unlock(&dbs_info->timer_mutex); | |
426 | continue; | |
427 | } | |
428 | ||
429 | next_sampling = jiffies + usecs_to_jiffies(new_rate); | |
430 | appointed_at = dbs_info->work.timer.expires; | |
431 | ||
432 | ||
433 | if (time_before(next_sampling, appointed_at)) { | |
434 | ||
435 | mutex_unlock(&dbs_info->timer_mutex); | |
436 | cancel_delayed_work_sync(&dbs_info->work); | |
437 | mutex_lock(&dbs_info->timer_mutex); | |
438 | ||
439 | schedule_delayed_work_on(dbs_info->cpu, &dbs_info->work, | |
440 | usecs_to_jiffies(new_rate)); | |
441 | ||
442 | } | |
443 | mutex_unlock(&dbs_info->timer_mutex); | |
444 | } | |
445 | } | |
446 | ||
447 | void bl_enable_timer(int enable) | |
448 | { | |
449 | static unsigned int sampling_rate_backup = 0; | |
450 | ||
451 | if (enable && !sampling_rate_backup) | |
452 | return; | |
453 | ||
454 | if (enable) | |
455 | update_sampling_rate(sampling_rate_backup); | |
456 | else { | |
457 | struct cpufreq_policy *policy; | |
458 | struct cpu_dbs_info_s *dbs_info; | |
459 | unsigned int new_rate = 30000 * 100; // change to 3s | |
460 | ||
461 | /* restore original sampling rate */ | |
462 | sampling_rate_backup = dbs_tuners_ins.sampling_rate; | |
463 | update_sampling_rate(new_rate); | |
464 | ||
465 | policy = cpufreq_cpu_get(0); | |
466 | if (!policy) | |
467 | return; | |
468 | ||
469 | dbs_info = &per_cpu(hp_cpu_dbs_info, 0); | |
470 | cpufreq_cpu_put(policy); | |
471 | ||
472 | mutex_lock(&dbs_info->timer_mutex); | |
473 | ||
474 | if (!delayed_work_pending(&dbs_info->work)) { | |
475 | mutex_unlock(&dbs_info->timer_mutex); | |
476 | return; | |
477 | } | |
478 | ||
479 | mutex_unlock(&dbs_info->timer_mutex); | |
480 | ||
481 | cancel_delayed_work_sync(&dbs_info->work); | |
482 | ||
483 | mutex_lock(&dbs_info->timer_mutex); | |
484 | ||
485 | schedule_delayed_work_on(dbs_info->cpu, &dbs_info->work, | |
486 | usecs_to_jiffies(new_rate)); | |
487 | ||
488 | mutex_unlock(&dbs_info->timer_mutex); | |
489 | } | |
490 | } | |
491 | EXPORT_SYMBOL(bl_enable_timer); | |
492 | ||
493 | static ssize_t store_sampling_rate(struct kobject *a, struct attribute *b, | |
494 | const char *buf, size_t count) | |
495 | { | |
496 | unsigned int input; | |
497 | int ret; | |
498 | ret = sscanf(buf, "%u", &input); | |
499 | if (ret != 1) | |
500 | return -EINVAL; | |
501 | update_sampling_rate(input); | |
502 | return count; | |
503 | } | |
504 | ||
505 | static ssize_t store_io_is_busy(struct kobject *a, struct attribute *b, | |
506 | const char *buf, size_t count) | |
507 | { | |
508 | unsigned int input; | |
509 | int ret; | |
510 | ||
511 | ret = sscanf(buf, "%u", &input); | |
512 | if (ret != 1) | |
513 | return -EINVAL; | |
514 | dbs_tuners_ins.io_is_busy = !!input; | |
515 | return count; | |
516 | } | |
517 | ||
518 | static ssize_t store_up_threshold(struct kobject *a, struct attribute *b, | |
519 | const char *buf, size_t count) | |
520 | { | |
521 | unsigned int input; | |
522 | int ret; | |
523 | ret = sscanf(buf, "%u", &input); | |
524 | ||
525 | if (ret != 1 || input > MAX_FREQUENCY_UP_THRESHOLD || | |
526 | input < MIN_FREQUENCY_UP_THRESHOLD) { | |
527 | return -EINVAL; | |
528 | } | |
529 | dbs_tuners_ins.up_threshold = input; | |
530 | return count; | |
531 | } | |
532 | ||
533 | static ssize_t store_od_threshold(struct kobject *a, struct attribute *b, | |
534 | const char *buf, size_t count) | |
535 | { | |
536 | unsigned int input; | |
537 | int ret; | |
538 | ret = sscanf(buf, "%u", &input); | |
539 | ||
540 | if (ret != 1 || input > MAX_FREQUENCY_UP_THRESHOLD || | |
541 | input < MIN_FREQUENCY_UP_THRESHOLD) { | |
542 | return -EINVAL; | |
543 | } | |
544 | dbs_tuners_ins.od_threshold = input; | |
545 | return count; | |
546 | } | |
547 | ||
548 | static ssize_t store_down_differential(struct kobject *a, struct attribute *b, | |
549 | const char *buf, size_t count) | |
550 | { | |
551 | unsigned int input; | |
552 | int ret; | |
553 | ret = sscanf(buf, "%u", &input); | |
554 | ||
555 | if (ret != 1 || input > MAX_FREQUENCY_DOWN_DIFFERENTIAL || | |
556 | input < MIN_FREQUENCY_DOWN_DIFFERENTIAL) { | |
557 | return -EINVAL; | |
558 | } | |
559 | dbs_tuners_ins.down_differential = input; | |
560 | return count; | |
561 | } | |
562 | ||
563 | static ssize_t store_sampling_down_factor(struct kobject *a, | |
564 | struct attribute *b, const char *buf, size_t count) | |
565 | { | |
566 | unsigned int input, j; | |
567 | int ret; | |
568 | ret = sscanf(buf, "%u", &input); | |
569 | ||
570 | if (ret != 1 || input > MAX_SAMPLING_DOWN_FACTOR || input < 1) | |
571 | return -EINVAL; | |
572 | dbs_tuners_ins.sampling_down_factor = input; | |
573 | ||
574 | /* Reset down sampling multiplier in case it was active */ | |
575 | for_each_online_cpu(j) { | |
576 | struct cpu_dbs_info_s *dbs_info; | |
577 | dbs_info = &per_cpu(hp_cpu_dbs_info, j); | |
578 | dbs_info->rate_mult = 1; | |
579 | } | |
580 | return count; | |
581 | } | |
582 | ||
583 | static ssize_t store_ignore_nice_load(struct kobject *a, struct attribute *b, | |
584 | const char *buf, size_t count) | |
585 | { | |
586 | unsigned int input; | |
587 | int ret; | |
588 | ||
589 | unsigned int j; | |
590 | ||
591 | ret = sscanf(buf, "%u", &input); | |
592 | if (ret != 1) | |
593 | return -EINVAL; | |
594 | ||
595 | if (input > 1) | |
596 | input = 1; | |
597 | ||
598 | if (input == dbs_tuners_ins.ignore_nice) { /* nothing to do */ | |
599 | return count; | |
600 | } | |
601 | dbs_tuners_ins.ignore_nice = input; | |
602 | ||
603 | /* we need to re-evaluate prev_cpu_idle */ | |
604 | for_each_online_cpu(j) { | |
605 | struct cpu_dbs_info_s *dbs_info; | |
606 | dbs_info = &per_cpu(hp_cpu_dbs_info, j); | |
607 | dbs_info->prev_cpu_idle = get_cpu_idle_time(j, | |
608 | &dbs_info->prev_cpu_wall, | |
609 | dbs_tuners_ins.io_is_busy); | |
610 | if (dbs_tuners_ins.ignore_nice) | |
611 | dbs_info->prev_cpu_nice = kcpustat_cpu(j).cpustat[CPUTIME_NICE]; | |
612 | ||
613 | } | |
614 | return count; | |
615 | } | |
616 | ||
617 | static ssize_t store_powersave_bias(struct kobject *a, struct attribute *b, | |
618 | const char *buf, size_t count) | |
619 | { | |
620 | unsigned int input; | |
621 | int ret; | |
622 | ret = sscanf(buf, "%u", &input); | |
623 | ||
624 | if (ret != 1) | |
625 | return -EINVAL; | |
626 | ||
627 | if (input > 1000) | |
628 | input = 1000; | |
629 | ||
630 | dbs_tuners_ins.powersave_bias = input; | |
631 | hotplug_powersave_bias_init(); | |
632 | return count; | |
633 | } | |
634 | ||
635 | static ssize_t store_cpu_up_threshold(struct kobject *a, struct attribute *b, | |
636 | const char *buf, size_t count) | |
637 | { | |
638 | unsigned int input; | |
639 | int ret; | |
640 | ret = sscanf(buf, "%u", &input); | |
641 | ||
642 | if (ret != 1 || input > MAX_CPU_UP_THRESHOLD || | |
643 | input < MIN_CPU_UP_THRESHOLD) { | |
644 | return -EINVAL; | |
645 | } | |
646 | dbs_tuners_ins.cpu_up_threshold = input; | |
647 | return count; | |
648 | } | |
649 | ||
650 | static ssize_t store_cpu_down_differential(struct kobject *a, struct attribute *b, | |
651 | const char *buf, size_t count) | |
652 | { | |
653 | unsigned int input; | |
654 | int ret; | |
655 | ret = sscanf(buf, "%u", &input); | |
656 | ||
657 | if (ret != 1 || input > MAX_CPU_DOWN_DIFFERENTIAL || | |
658 | input < MIN_CPU_DOWN_DIFFERENTIAL) { | |
659 | return -EINVAL; | |
660 | } | |
661 | dbs_tuners_ins.cpu_down_differential = input; | |
662 | return count; | |
663 | } | |
664 | ||
665 | static ssize_t store_cpu_up_avg_times(struct kobject *a, struct attribute *b, | |
666 | const char *buf, size_t count) | |
667 | { | |
668 | unsigned int input; | |
669 | int ret; | |
670 | ret = sscanf(buf, "%u", &input); | |
671 | ||
672 | dbs_tuners_ins.cpu_up_avg_times = input; | |
673 | return count; | |
674 | } | |
675 | ||
676 | static ssize_t store_cpu_down_avg_times(struct kobject *a, struct attribute *b, | |
677 | const char *buf, size_t count) | |
678 | { | |
679 | unsigned int input; | |
680 | int ret; | |
681 | ret = sscanf(buf, "%u", &input); | |
682 | ||
683 | dbs_tuners_ins.cpu_down_avg_times = input; | |
684 | return count; | |
685 | } | |
686 | ||
687 | static ssize_t store_thermal_dispatch_avg_times(struct kobject *a, struct attribute *b, | |
688 | const char *buf, size_t count) | |
689 | { | |
690 | unsigned int input; | |
691 | int ret; | |
692 | ret = sscanf(buf, "%u", &input); | |
693 | ||
694 | dbs_tuners_ins.thermal_dispatch_avg_times = input; | |
695 | return count; | |
696 | } | |
697 | ||
698 | static ssize_t store_cpu_num_limit(struct kobject *a, struct attribute *b, | |
699 | const char *buf, size_t count) | |
700 | { | |
701 | unsigned int input; | |
702 | int ret; | |
703 | ret = sscanf(buf, "%u", &input); | |
704 | ||
705 | dbs_tuners_ins.cpu_num_limit = input; | |
706 | return count; | |
707 | } | |
708 | ||
709 | static ssize_t store_cpu_num_base(struct kobject *a, struct attribute *b, | |
710 | const char *buf, size_t count) | |
711 | { | |
712 | unsigned int input; | |
713 | bool raise_freq = false; | |
714 | int ret; | |
715 | struct cpufreq_policy *policy; | |
716 | ||
717 | policy = cpufreq_cpu_get(0); | |
718 | ret = sscanf(buf, "%u", &input); | |
719 | ||
720 | dbs_tuners_ins.cpu_num_base = input; | |
721 | mutex_lock(&hp_mutex); | |
722 | if (num_online_cpus() < dbs_tuners_ins.cpu_num_base && num_online_cpus() < dbs_tuners_ins.cpu_num_limit) { | |
723 | raise_freq = true; | |
724 | g_next_hp_action = 1; | |
725 | schedule_delayed_work_on(0, &hp_work, 0); | |
726 | } | |
727 | mutex_unlock(&hp_mutex); | |
728 | ||
729 | if(raise_freq == true) | |
730 | dbs_freq_increase(policy, policy->max); | |
731 | ||
732 | return count; | |
733 | } | |
734 | ||
735 | static ssize_t store_is_cpu_hotplug_disable(struct kobject *a, struct attribute *b, | |
736 | const char *buf, size_t count) | |
737 | { | |
738 | unsigned int input; | |
739 | int ret; | |
740 | ret = sscanf(buf, "%u", &input); | |
741 | ||
742 | dbs_tuners_ins.is_cpu_hotplug_disable = input; | |
743 | return count; | |
744 | } | |
745 | ||
746 | #if INPUT_BOOST | |
747 | static ssize_t store_cpu_input_boost_enable(struct kobject *a, struct attribute *b, | |
748 | const char *buf, size_t count) | |
749 | { | |
750 | unsigned int input; | |
751 | int ret; | |
752 | ret = sscanf(buf, "%u", &input); | |
753 | ||
754 | if (ret != 1 || input > 1 || | |
755 | input < 0) { | |
756 | return -EINVAL; | |
757 | } | |
758 | ||
759 | mutex_lock(&hp_mutex); | |
760 | dbs_tuners_ins.cpu_input_boost_enable = input; | |
761 | mutex_unlock(&hp_mutex); | |
762 | ||
763 | return count; | |
764 | } | |
765 | #endif | |
766 | ||
767 | define_one_global_rw(sampling_rate); | |
768 | define_one_global_rw(io_is_busy); | |
769 | define_one_global_rw(up_threshold); | |
770 | define_one_global_rw(od_threshold); | |
771 | define_one_global_rw(down_differential); | |
772 | define_one_global_rw(sampling_down_factor); | |
773 | define_one_global_rw(ignore_nice_load); | |
774 | define_one_global_rw(powersave_bias); | |
775 | define_one_global_rw(cpu_up_threshold); | |
776 | define_one_global_rw(cpu_down_differential); | |
777 | define_one_global_rw(cpu_up_avg_times); | |
778 | define_one_global_rw(cpu_down_avg_times); | |
779 | define_one_global_rw(thermal_dispatch_avg_times); | |
780 | define_one_global_rw(cpu_num_limit); | |
781 | define_one_global_rw(cpu_num_base); | |
782 | define_one_global_rw(is_cpu_hotplug_disable); | |
783 | #if INPUT_BOOST | |
784 | define_one_global_rw(cpu_input_boost_enable); | |
785 | #endif | |
786 | ||
787 | static struct attribute *dbs_attributes[] = { | |
788 | &sampling_rate_min.attr, | |
789 | &sampling_rate.attr, | |
790 | &up_threshold.attr, | |
791 | &od_threshold.attr, | |
792 | &down_differential.attr, | |
793 | &sampling_down_factor.attr, | |
794 | &ignore_nice_load.attr, | |
795 | &powersave_bias.attr, | |
796 | &io_is_busy.attr, | |
797 | &cpu_up_threshold.attr, | |
798 | &cpu_down_differential.attr, | |
799 | &cpu_up_avg_times.attr, | |
800 | &cpu_down_avg_times.attr, | |
801 | &thermal_dispatch_avg_times.attr, | |
802 | &cpu_num_limit.attr, | |
803 | &cpu_num_base.attr, | |
804 | &is_cpu_hotplug_disable.attr, | |
805 | #if INPUT_BOOST | |
806 | &cpu_input_boost_enable.attr, | |
807 | #endif | |
808 | NULL | |
809 | }; | |
810 | ||
811 | static struct attribute_group dbs_attr_group = { | |
812 | .attrs = dbs_attributes, | |
813 | .name = "hotplug", | |
814 | }; | |
815 | ||
816 | /************************** sysfs end ************************/ | |
817 | ||
818 | static void dbs_freq_increase(struct cpufreq_policy *p, unsigned int freq) | |
819 | { | |
820 | if (dbs_tuners_ins.powersave_bias) | |
821 | freq = powersave_bias_target(p, freq, CPUFREQ_RELATION_H); | |
822 | else if (p->cur == p->max) | |
823 | { | |
824 | if (dbs_ignore == 0) | |
825 | dbs_ignore = 1; | |
826 | else | |
827 | return; | |
828 | } | |
829 | ||
830 | __cpufreq_driver_target(p, freq, dbs_tuners_ins.powersave_bias ? | |
831 | CPUFREQ_RELATION_L : CPUFREQ_RELATION_H); | |
832 | } | |
833 | ||
834 | int mt_cpufreq_cur_load(void) | |
835 | { | |
836 | return cpu_loading; | |
837 | } | |
838 | EXPORT_SYMBOL(mt_cpufreq_cur_load); | |
839 | ||
840 | void hp_set_dynamic_cpu_hotplug_enable(int enable) | |
841 | { | |
842 | mutex_lock(&hp_mutex); | |
843 | dbs_tuners_ins.is_cpu_hotplug_disable = !enable; | |
844 | mutex_unlock(&hp_mutex); | |
845 | } | |
846 | EXPORT_SYMBOL(hp_set_dynamic_cpu_hotplug_enable); | |
847 | ||
848 | void hp_limited_cpu_num(int num) | |
849 | { | |
850 | mutex_lock(&hp_mutex); | |
851 | dbs_tuners_ins.cpu_num_limit = num; | |
852 | ||
853 | if (num < num_online_cpus()) { | |
854 | printk("%s: CPU off due to thermal protection! limit_num = %d < online = %d\n", | |
855 | __func__, num, num_online_cpus()); | |
856 | g_next_hp_action = 0; | |
857 | schedule_delayed_work_on(0, &hp_work, 0); | |
858 | g_cpu_down_count = 0; | |
859 | g_cpu_down_sum_load = 0; | |
860 | } | |
861 | ||
862 | mutex_unlock(&hp_mutex); | |
863 | } | |
864 | EXPORT_SYMBOL(hp_limited_cpu_num); | |
865 | void hp_based_cpu_num(int num) | |
866 | { | |
867 | mutex_lock(&hp_mutex); | |
868 | dbs_tuners_ins.cpu_num_base = num; | |
869 | mutex_unlock(&hp_mutex); | |
870 | } | |
871 | EXPORT_SYMBOL(hp_based_cpu_num); | |
872 | ||
873 | #ifdef CONFIG_SMP | |
874 | ||
8ca3027e | 875 | static void __cpuinit hp_work_handler(struct work_struct *work) |
6fa3eb70 S |
876 | { |
877 | if (mutex_trylock(&bl_onoff_mutex)) | |
878 | { | |
879 | if (!dbs_tuners_ins.is_cpu_hotplug_disable) | |
880 | { | |
881 | int onlines_cpu_n = num_online_cpus(); | |
882 | ||
883 | if (g_next_hp_action) // turn on CPU | |
884 | { | |
885 | if (onlines_cpu_n < num_possible_cpus()) | |
886 | { | |
887 | printk("hp_work_handler: cpu_up(%d) kick off\n", onlines_cpu_n); | |
888 | cpu_up(onlines_cpu_n); | |
889 | printk("hp_work_handler: cpu_up(%d) completion\n", onlines_cpu_n); | |
890 | ||
891 | dbs_ignore = 0; // force trigger frequency scaling | |
892 | } | |
893 | } | |
894 | else // turn off CPU | |
895 | { | |
896 | if (onlines_cpu_n > 1) | |
897 | { | |
898 | printk("hp_work_handler: cpu_down(%d) kick off\n", (onlines_cpu_n - 1)); | |
899 | cpu_down((onlines_cpu_n - 1)); | |
900 | printk("hp_work_handler: cpu_down(%d) completion\n", (onlines_cpu_n - 1)); | |
901 | ||
902 | dbs_ignore = 0; // force trigger frequency scaling | |
903 | } | |
904 | } | |
905 | } | |
906 | mutex_unlock(&bl_onoff_mutex); | |
907 | } | |
908 | } | |
909 | ||
910 | #endif | |
911 | ||
912 | static void dbs_check_cpu(struct cpu_dbs_info_s *this_dbs_info) | |
913 | { | |
914 | unsigned int max_load_freq; | |
915 | bool raise_freq = false; | |
916 | ||
917 | struct cpufreq_policy *policy; | |
918 | unsigned int j; | |
919 | ||
920 | this_dbs_info->freq_lo = 0; | |
921 | policy = this_dbs_info->cur_policy; | |
922 | ||
923 | /* | |
924 | * Every sampling_rate, we check, if current idle time is less | |
925 | * than 20% (default), then we try to increase frequency | |
926 | * Every sampling_rate, we look for a the lowest | |
927 | * frequency which can sustain the load while keeping idle time over | |
928 | * 30%. If such a frequency exist, we try to decrease to this frequency. | |
929 | * | |
930 | * Any frequency increase takes it to the maximum frequency. | |
931 | * Frequency reduction happens at minimum steps of | |
932 | * 5% (default) of current frequency | |
933 | */ | |
934 | ||
935 | /* Get Absolute Load - in terms of freq */ | |
936 | max_load_freq = 0; | |
937 | cpus_sum_load = 0; | |
938 | ||
939 | for_each_cpu(j, policy->cpus) { | |
940 | struct cpu_dbs_info_s *j_dbs_info; | |
941 | cputime64_t cur_wall_time, cur_idle_time, cur_iowait_time; | |
942 | unsigned int idle_time, wall_time, iowait_time; | |
943 | unsigned int load, load_freq; | |
944 | int freq_avg; | |
945 | ||
946 | j_dbs_info = &per_cpu(hp_cpu_dbs_info, j); | |
947 | ||
948 | cur_idle_time = get_cpu_idle_time(j, &cur_wall_time, | |
949 | dbs_tuners_ins.io_is_busy); | |
950 | cur_iowait_time = get_cpu_iowait_time(j, &cur_wall_time); | |
951 | ||
952 | wall_time = (unsigned int) | |
953 | (cur_wall_time - j_dbs_info->prev_cpu_wall); | |
954 | j_dbs_info->prev_cpu_wall = cur_wall_time; | |
955 | ||
956 | idle_time = (unsigned int) | |
957 | (cur_idle_time - j_dbs_info->prev_cpu_idle); | |
958 | j_dbs_info->prev_cpu_idle = cur_idle_time; | |
959 | ||
960 | iowait_time = (unsigned int) | |
961 | (cur_iowait_time - j_dbs_info->prev_cpu_iowait); | |
962 | j_dbs_info->prev_cpu_iowait = cur_iowait_time; | |
963 | ||
964 | if (dbs_tuners_ins.ignore_nice) { | |
965 | u64 cur_nice; | |
966 | unsigned long cur_nice_jiffies; | |
967 | ||
968 | cur_nice = kcpustat_cpu(j).cpustat[CPUTIME_NICE] - | |
969 | j_dbs_info->prev_cpu_nice; | |
970 | /* | |
971 | * Assumption: nice time between sampling periods will | |
972 | * be less than 2^32 jiffies for 32 bit sys | |
973 | */ | |
974 | cur_nice_jiffies = (unsigned long) | |
975 | cputime64_to_jiffies64(cur_nice); | |
976 | ||
977 | j_dbs_info->prev_cpu_nice = kcpustat_cpu(j).cpustat[CPUTIME_NICE]; | |
978 | idle_time += jiffies_to_usecs(cur_nice_jiffies); | |
979 | } | |
980 | ||
981 | /* | |
982 | * For the purpose of hotplug, waiting for disk IO is an | |
983 | * indication that you're performance critical, and not that | |
984 | * the system is actually idle. So subtract the iowait time | |
985 | * from the cpu idle time. | |
986 | */ | |
987 | ||
988 | if (dbs_tuners_ins.io_is_busy && idle_time >= iowait_time) | |
989 | idle_time -= iowait_time; | |
990 | ||
991 | if (unlikely(!wall_time || wall_time < idle_time)) | |
992 | continue; | |
993 | ||
994 | load = 100 * (wall_time - idle_time) / wall_time; | |
995 | ||
996 | cpus_sum_load += load; | |
997 | ||
998 | freq_avg = __cpufreq_driver_getavg(policy, j); | |
999 | if (freq_avg <= 0) | |
1000 | freq_avg = policy->cur; | |
1001 | ||
1002 | load_freq = load * freq_avg; | |
1003 | if (load_freq > max_load_freq) | |
1004 | max_load_freq = load_freq; | |
1005 | ||
1006 | #ifdef DEBUG_LOG | |
1007 | printk("dbs_check_cpu: cpu = %d\n", j); | |
1008 | printk("dbs_check_cpu: wall_time = %d, idle_time = %d, load = %d\n", wall_time, idle_time, load); | |
1009 | printk("dbs_check_cpu: freq_avg = %d, max_load_freq = %d, cpus_sum_load = %d\n", freq_avg, max_load_freq, cpus_sum_load); | |
1010 | #endif | |
1011 | } | |
1012 | // record loading information | |
1013 | cpu_loading = max_load_freq / policy->cur; | |
1014 | // dispatch power budget | |
1015 | if(g_thermal_count >= dbs_tuners_ins.thermal_dispatch_avg_times) { | |
1016 | g_thermal_count = 0; | |
1017 | mt_dvfs_power_dispatch_safe(); | |
1018 | if ((dbs_thermal_limited == 1) && (policy->cur > dbs_thermal_limited_freq)) | |
1019 | __cpufreq_driver_target(policy, dbs_thermal_limited_freq, CPUFREQ_RELATION_L); | |
1020 | } | |
1021 | else | |
1022 | g_thermal_count++; | |
1023 | ||
1024 | if (policy->cur >= get_normal_max_freq()){ | |
1025 | if ((max_load_freq > dbs_tuners_ins.od_threshold * policy->cur) && (num_online_cpus() == num_possible_cpus())){ | |
1026 | g_max_cpu_persist_count++; | |
1027 | #ifdef DEBUG_LOG | |
1028 | printk("dvfs_od: g_max_cpu_persist_count: %d\n", g_max_cpu_persist_count); | |
1029 | #endif | |
1030 | if(g_max_cpu_persist_count == DEF_CPU_PERSIST_COUNT){ | |
1031 | //only ramp up to OD OPP here | |
1032 | #ifdef DEBUG_LOG | |
1033 | printk("dvfs_od: cpu loading = %d\n", max_load_freq/policy->cur); | |
1034 | #endif | |
1035 | if (policy->cur < policy->max) | |
1036 | this_dbs_info->rate_mult = | |
1037 | dbs_tuners_ins.sampling_down_factor; | |
1038 | dbs_freq_increase(policy, policy->max); | |
1039 | #ifdef DEBUG_LOG | |
1040 | printk("reset g_max_cpu_persist_count, count = 10\n"); | |
1041 | #endif | |
1042 | g_max_cpu_persist_count = 0; | |
1043 | goto hp_check; | |
1044 | } | |
1045 | } | |
1046 | else { | |
1047 | g_max_cpu_persist_count = 0; | |
1048 | } | |
1049 | } | |
1050 | else{ | |
1051 | if (max_load_freq > dbs_tuners_ins.up_threshold * policy->cur) { | |
1052 | /* If switching to max speed, apply sampling_down_factor */ | |
1053 | if (policy->cur < get_normal_max_freq()) | |
1054 | this_dbs_info->rate_mult = | |
1055 | dbs_tuners_ins.sampling_down_factor; | |
1056 | dbs_freq_increase(policy, get_normal_max_freq()); | |
1057 | if(g_max_cpu_persist_count != 0){ | |
1058 | g_max_cpu_persist_count = 0; | |
1059 | #ifdef DEBUG_LOG | |
1060 | printk("reset g_max_cpu_persist_count, and fallback to normal max\n"); | |
1061 | #endif | |
1062 | } | |
1063 | goto hp_check; | |
1064 | } | |
1065 | } | |
1066 | ||
1067 | /* Check for frequency decrease */ | |
1068 | /* if we cannot reduce the frequency anymore, break out early */ | |
1069 | if (policy->cur == policy->min) | |
1070 | goto hp_check; | |
1071 | ||
1072 | /* | |
1073 | * The optimal frequency is the frequency that is the lowest that | |
1074 | * can support the current CPU usage without triggering the up | |
1075 | * policy. To be safe, we focus 10 points under the threshold. | |
1076 | */ | |
1077 | if (max_load_freq < | |
1078 | (dbs_tuners_ins.up_threshold - dbs_tuners_ins.down_differential) * | |
1079 | policy->cur) { | |
1080 | unsigned int freq_next; | |
1081 | freq_next = max_load_freq / | |
1082 | (dbs_tuners_ins.up_threshold - | |
1083 | dbs_tuners_ins.down_differential); | |
1084 | ||
1085 | /* No longer fully busy, reset rate_mult */ | |
1086 | this_dbs_info->rate_mult = 1; | |
1087 | ||
1088 | if (freq_next < policy->min) | |
1089 | freq_next = policy->min; | |
1090 | ||
1091 | if(g_max_cpu_persist_count != 0){ | |
1092 | g_max_cpu_persist_count = 0; | |
1093 | #ifdef DEBUG_LOG | |
1094 | printk("reset g_max_cpu_persist_count, decrease freq accrording to loading\n"); | |
1095 | #endif | |
1096 | } | |
1097 | ||
1098 | if (!dbs_tuners_ins.powersave_bias) { | |
1099 | __cpufreq_driver_target(policy, freq_next, | |
1100 | CPUFREQ_RELATION_L); | |
1101 | } else { | |
1102 | int freq = powersave_bias_target(policy, freq_next, | |
1103 | CPUFREQ_RELATION_L); | |
1104 | __cpufreq_driver_target(policy, freq, | |
1105 | CPUFREQ_RELATION_L); | |
1106 | } | |
1107 | } | |
1108 | ||
1109 | hp_check: | |
1110 | ||
1111 | /* If Hot Plug policy disable, return directly */ | |
1112 | if (dbs_tuners_ins.is_cpu_hotplug_disable) | |
1113 | return; | |
1114 | ||
1115 | #ifdef CONFIG_SMP | |
1116 | mutex_lock(&hp_mutex); | |
1117 | ||
1118 | /* Check CPU loading to power up slave CPU */ | |
1119 | if (num_online_cpus() < dbs_tuners_ins.cpu_num_base && num_online_cpus() < dbs_tuners_ins.cpu_num_limit) { | |
1120 | raise_freq = true; | |
1121 | printk("dbs_check_cpu: turn on CPU by perf service\n"); | |
1122 | g_next_hp_action = 1; | |
1123 | schedule_delayed_work_on(0, &hp_work, 0); | |
1124 | } else if (num_online_cpus() < num_possible_cpus() && num_online_cpus() < dbs_tuners_ins.cpu_num_limit) { | |
1125 | g_cpu_up_count++; | |
1126 | g_cpu_up_sum_load += cpus_sum_load; | |
1127 | if (g_cpu_up_count == dbs_tuners_ins.cpu_up_avg_times) { | |
1128 | g_cpu_up_sum_load /= dbs_tuners_ins.cpu_up_avg_times; | |
1129 | if (g_cpu_up_sum_load > | |
1130 | (dbs_tuners_ins.cpu_up_threshold * num_online_cpus())) { | |
1131 | #ifdef DEBUG_LOG | |
1132 | printk("dbs_check_cpu: g_cpu_up_sum_load = %d\n", g_cpu_up_sum_load); | |
1133 | #endif | |
1134 | raise_freq = true; | |
1135 | printk("dbs_check_cpu: turn on CPU\n"); | |
1136 | g_next_hp_action = 1; | |
1137 | schedule_delayed_work_on(0, &hp_work, 0); | |
1138 | } | |
1139 | g_cpu_up_count = 0; | |
1140 | g_cpu_up_sum_load = 0; | |
1141 | } | |
1142 | #ifdef DEBUG_LOG | |
1143 | printk("dbs_check_cpu: g_cpu_up_count = %d, g_cpu_up_sum_load = %d\n", g_cpu_up_count, g_cpu_up_sum_load); | |
1144 | printk("dbs_check_cpu: cpu_up_threshold = %d\n", (dbs_tuners_ins.cpu_up_threshold * num_online_cpus())); | |
1145 | #endif | |
1146 | } | |
1147 | ||
1148 | /* Check CPU loading to power down slave CPU */ | |
1149 | if (num_online_cpus() > 1) { | |
1150 | g_cpu_down_count++; | |
1151 | g_cpu_down_sum_load += cpus_sum_load; | |
1152 | if (g_cpu_down_count == dbs_tuners_ins.cpu_down_avg_times) { | |
1153 | g_cpu_down_sum_load /= dbs_tuners_ins.cpu_down_avg_times; | |
1154 | if (g_cpu_down_sum_load < | |
1155 | ((dbs_tuners_ins.cpu_up_threshold - dbs_tuners_ins.cpu_down_differential) * (num_online_cpus() - 1))) { | |
1156 | if (num_online_cpus() > dbs_tuners_ins.cpu_num_base) { | |
1157 | #ifdef DEBUG_LOG | |
1158 | printk("dbs_check_cpu: g_cpu_down_sum_load = %d\n", g_cpu_down_sum_load); | |
1159 | #endif | |
1160 | raise_freq = true; | |
1161 | printk("dbs_check_cpu: turn off CPU\n"); | |
1162 | g_next_hp_action = 0; | |
1163 | schedule_delayed_work_on(0, &hp_work, 0); | |
1164 | } | |
1165 | } | |
1166 | g_cpu_down_count = 0; | |
1167 | g_cpu_down_sum_load = 0; | |
1168 | } | |
1169 | #ifdef DEBUG_LOG | |
1170 | printk("dbs_check_cpu: g_cpu_down_count = %d, g_cpu_down_sum_load = %d\n", g_cpu_down_count, g_cpu_down_sum_load); | |
1171 | printk("dbs_check_cpu: cpu_down_threshold = %d\n", ((dbs_tuners_ins.cpu_up_threshold - dbs_tuners_ins.cpu_down_differential) * (num_online_cpus() - 1))); | |
1172 | #endif | |
1173 | } | |
1174 | ||
1175 | mutex_unlock(&hp_mutex); | |
1176 | #endif | |
1177 | // need to retrieve dbs_freq_increase out of hp_mutex | |
1178 | // in case of self-deadlock | |
1179 | if(raise_freq == true) | |
1180 | dbs_freq_increase(policy, policy->max); | |
1181 | ||
1182 | return; | |
1183 | } | |
1184 | ||
1185 | static void do_dbs_timer(struct work_struct *work) | |
1186 | { | |
1187 | struct cpu_dbs_info_s *dbs_info = | |
1188 | container_of(work, struct cpu_dbs_info_s, work.work); | |
1189 | unsigned int cpu = dbs_info->cpu; | |
1190 | int sample_type = dbs_info->sample_type; | |
1191 | ||
1192 | int delay; | |
1193 | ||
1194 | mutex_lock(&dbs_info->timer_mutex); | |
1195 | ||
1196 | /* Common NORMAL_SAMPLE setup */ | |
1197 | dbs_info->sample_type = DBS_NORMAL_SAMPLE; | |
1198 | if (!dbs_tuners_ins.powersave_bias || | |
1199 | sample_type == DBS_NORMAL_SAMPLE) { | |
1200 | dbs_check_cpu(dbs_info); | |
1201 | if (dbs_info->freq_lo) { | |
1202 | /* Setup timer for SUB_SAMPLE */ | |
1203 | dbs_info->sample_type = DBS_SUB_SAMPLE; | |
1204 | delay = dbs_info->freq_hi_jiffies; | |
1205 | } else { | |
1206 | /* We want all CPUs to do sampling nearly on | |
1207 | * same jiffy | |
1208 | */ | |
1209 | delay = usecs_to_jiffies(dbs_tuners_ins.sampling_rate | |
1210 | * dbs_info->rate_mult); | |
1211 | ||
1212 | if (num_online_cpus() > 1) | |
1213 | delay -= jiffies % delay; | |
1214 | } | |
1215 | } else { | |
1216 | __cpufreq_driver_target(dbs_info->cur_policy, | |
1217 | dbs_info->freq_lo, CPUFREQ_RELATION_H); | |
1218 | delay = dbs_info->freq_lo_jiffies; | |
1219 | } | |
1220 | schedule_delayed_work_on(cpu, &dbs_info->work, delay); | |
1221 | mutex_unlock(&dbs_info->timer_mutex); | |
1222 | } | |
1223 | ||
1224 | static inline void dbs_timer_init(struct cpu_dbs_info_s *dbs_info) | |
1225 | { | |
1226 | /* We want all CPUs to do sampling nearly on same jiffy */ | |
1227 | int delay = usecs_to_jiffies(dbs_tuners_ins.sampling_rate); | |
1228 | ||
1229 | if (num_online_cpus() > 1) | |
1230 | delay -= jiffies % delay; | |
1231 | ||
1232 | dbs_info->sample_type = DBS_NORMAL_SAMPLE; | |
1233 | INIT_DELAYED_WORK(&dbs_info->work, do_dbs_timer); | |
1234 | schedule_delayed_work_on(dbs_info->cpu, &dbs_info->work, delay); | |
1235 | } | |
1236 | ||
1237 | static inline void dbs_timer_exit(struct cpu_dbs_info_s *dbs_info) | |
1238 | { | |
1239 | cancel_delayed_work_sync(&dbs_info->work); | |
1240 | } | |
1241 | ||
1242 | /* | |
1243 | * Not all CPUs want IO time to be accounted as busy; this dependson how | |
1244 | * efficient idling at a higher frequency/voltage is. | |
1245 | * Pavel Machek says this is not so for various generations of AMD and old | |
1246 | * Intel systems. | |
1247 | * Mike Chan (androidlcom) calis this is also not true for ARM. | |
1248 | * Because of this, whitelist specific known (series) of CPUs by default, and | |
1249 | * leave all others up to the user. | |
1250 | */ | |
1251 | static int should_io_be_busy(void) | |
1252 | { | |
1253 | #if defined(CONFIG_X86) | |
1254 | /* | |
1255 | * For Intel, Core 2 (model 15) andl later have an efficient idle. | |
1256 | */ | |
1257 | if (boot_cpu_data.x86_vendor == X86_VENDOR_INTEL && | |
1258 | boot_cpu_data.x86 == 6 && | |
1259 | boot_cpu_data.x86_model >= 15) | |
1260 | return 1; | |
1261 | #endif | |
1262 | return 1; // io wait time should be subtracted from idle time | |
1263 | } | |
1264 | ||
1265 | #if INPUT_BOOST | |
1266 | static void dbs_input_event(struct input_handle *handle, unsigned int type, | |
1267 | unsigned int code, int value) | |
1268 | { | |
1269 | if ((type == EV_KEY) && (code == BTN_TOUCH) && (value == 1) && (dbs_tuners_ins.cpu_input_boost_enable)) | |
1270 | { | |
1271 | force_two_core(); | |
1272 | } | |
1273 | } | |
1274 | ||
1275 | static int dbs_input_connect(struct input_handler *handler, | |
1276 | struct input_dev *dev, const struct input_device_id *id) | |
1277 | { | |
1278 | struct input_handle *handle; | |
1279 | int error; | |
1280 | ||
1281 | handle = kzalloc(sizeof(struct input_handle), GFP_KERNEL); | |
1282 | if (!handle) | |
1283 | return -ENOMEM; | |
1284 | ||
1285 | handle->dev = dev; | |
1286 | handle->handler = handler; | |
1287 | handle->name = "cpufreq_balance"; | |
1288 | ||
1289 | error = input_register_handle(handle); | |
1290 | if (error) | |
1291 | goto err2; | |
1292 | ||
1293 | error = input_open_device(handle); | |
1294 | if (error) | |
1295 | goto err1; | |
1296 | ||
1297 | return 0; | |
1298 | err1: | |
1299 | input_unregister_handle(handle); | |
1300 | err2: | |
1301 | kfree(handle); | |
1302 | return error; | |
1303 | } | |
1304 | ||
1305 | static void dbs_input_disconnect(struct input_handle *handle) | |
1306 | { | |
1307 | input_close_device(handle); | |
1308 | input_unregister_handle(handle); | |
1309 | kfree(handle); | |
1310 | } | |
1311 | ||
1312 | static const struct input_device_id dbs_ids[] = { | |
1313 | { | |
1314 | .flags = INPUT_DEVICE_ID_MATCH_EVBIT | | |
1315 | INPUT_DEVICE_ID_MATCH_ABSBIT, | |
1316 | .evbit = { BIT_MASK(EV_ABS) }, | |
1317 | .absbit = { [BIT_WORD(ABS_MT_POSITION_X)] = | |
1318 | BIT_MASK(ABS_MT_POSITION_X) | | |
1319 | BIT_MASK(ABS_MT_POSITION_Y) }, | |
1320 | }, /* multi-touch touchscreen */ | |
1321 | { | |
1322 | .flags = INPUT_DEVICE_ID_MATCH_KEYBIT | | |
1323 | INPUT_DEVICE_ID_MATCH_ABSBIT, | |
1324 | .keybit = { [BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH) }, | |
1325 | .absbit = { [BIT_WORD(ABS_X)] = | |
1326 | BIT_MASK(ABS_X) | BIT_MASK(ABS_Y) }, | |
1327 | }, /* touchpad */ | |
1328 | { }, | |
1329 | }; | |
1330 | ||
1331 | static struct input_handler dbs_input_handler = { | |
1332 | .event = dbs_input_event, | |
1333 | .connect = dbs_input_connect, | |
1334 | .disconnect = dbs_input_disconnect, | |
1335 | .name = "cpufreq_balance", | |
1336 | .id_table = dbs_ids, | |
1337 | }; | |
1338 | #endif //#ifdef CONFIG_HOTPLUG_CPU | |
1339 | ||
1340 | ||
1341 | ||
1342 | static int cpufreq_governor_dbs(struct cpufreq_policy *policy, | |
1343 | unsigned int event) | |
1344 | { | |
1345 | unsigned int cpu = policy->cpu; | |
1346 | struct cpu_dbs_info_s *this_dbs_info; | |
1347 | unsigned int j; | |
1348 | int rc; | |
1349 | ||
1350 | this_dbs_info = &per_cpu(hp_cpu_dbs_info, cpu); | |
1351 | ||
1352 | switch (event) { | |
1353 | case CPUFREQ_GOV_START: | |
1354 | if ((!cpu_online(cpu)) || (!policy->cur)) | |
1355 | return -EINVAL; | |
1356 | ||
1357 | mutex_lock(&dbs_mutex); | |
1358 | ||
1359 | dbs_enable++; | |
1360 | for_each_cpu(j, policy->cpus) { | |
1361 | struct cpu_dbs_info_s *j_dbs_info; | |
1362 | j_dbs_info = &per_cpu(hp_cpu_dbs_info, j); | |
1363 | j_dbs_info->cur_policy = policy; | |
1364 | ||
1365 | j_dbs_info->prev_cpu_idle = get_cpu_idle_time(j, | |
1366 | &j_dbs_info->prev_cpu_wall, | |
1367 | dbs_tuners_ins.io_is_busy); | |
1368 | ||
1369 | if (dbs_tuners_ins.ignore_nice) | |
1370 | j_dbs_info->prev_cpu_nice = | |
1371 | kcpustat_cpu(j).cpustat[CPUTIME_NICE]; | |
1372 | } | |
1373 | this_dbs_info->cpu = cpu; | |
1374 | this_dbs_info->rate_mult = 1; | |
1375 | hotplug_powersave_bias_init_cpu(cpu); | |
1376 | /* | |
1377 | * Start the timerschedule work, when this governor | |
1378 | * is used for first time | |
1379 | */ | |
1380 | if (dbs_enable == 1) { | |
1381 | unsigned int latency; | |
1382 | ||
1383 | rc = sysfs_create_group(cpufreq_global_kobject, | |
1384 | &dbs_attr_group); | |
1385 | if (rc) { | |
1386 | mutex_unlock(&dbs_mutex); | |
1387 | return rc; | |
1388 | } | |
1389 | ||
1390 | /* policy latency is in nS. Convert it to uS first */ | |
1391 | latency = policy->cpuinfo.transition_latency / 1000; | |
1392 | if (latency == 0) | |
1393 | latency = 1; | |
1394 | /* Bring kernel and HW constraints together */ | |
1395 | min_sampling_rate = max(min_sampling_rate, | |
1396 | MIN_LATENCY_MULTIPLIER * latency); | |
1397 | dbs_tuners_ins.sampling_rate = | |
1398 | max(min_sampling_rate, | |
1399 | latency * LATENCY_MULTIPLIER); | |
1400 | dbs_tuners_ins.io_is_busy = should_io_be_busy(); | |
1401 | ||
1402 | #ifdef DEBUG_LOG | |
1403 | printk("cpufreq_governor_dbs: min_sampling_rate = %d\n", min_sampling_rate); | |
1404 | printk("cpufreq_governor_dbs: dbs_tuners_ins.sampling_rate = %d\n", dbs_tuners_ins.sampling_rate); | |
1405 | printk("cpufreq_governor_dbs: dbs_tuners_ins.io_is_busy = %d\n", dbs_tuners_ins.io_is_busy); | |
1406 | #endif | |
1407 | } | |
1408 | #if INPUT_BOOST | |
1409 | if (!cpu) | |
1410 | rc = input_register_handler(&dbs_input_handler); | |
1411 | #endif | |
1412 | mutex_unlock(&dbs_mutex); | |
1413 | ||
1414 | mutex_init(&this_dbs_info->timer_mutex); | |
1415 | dbs_timer_init(this_dbs_info); | |
1416 | break; | |
1417 | ||
1418 | case CPUFREQ_GOV_STOP: | |
1419 | dbs_timer_exit(this_dbs_info); | |
1420 | ||
1421 | mutex_lock(&dbs_mutex); | |
1422 | mutex_destroy(&this_dbs_info->timer_mutex); | |
1423 | dbs_enable--; | |
1424 | #if INPUT_BOOST | |
1425 | if (!cpu) | |
1426 | input_unregister_handler(&dbs_input_handler); | |
1427 | ||
1428 | #endif | |
1429 | mutex_unlock(&dbs_mutex); | |
1430 | if (!dbs_enable) | |
1431 | sysfs_remove_group(cpufreq_global_kobject, | |
1432 | &dbs_attr_group); | |
1433 | ||
1434 | break; | |
1435 | ||
1436 | case CPUFREQ_GOV_LIMITS: | |
1437 | mutex_lock(&this_dbs_info->timer_mutex); | |
1438 | if (get_normal_max_freq() < this_dbs_info->cur_policy->cur) | |
1439 | __cpufreq_driver_target(this_dbs_info->cur_policy, | |
1440 | get_normal_max_freq(), CPUFREQ_RELATION_H); | |
1441 | else if (policy->min > this_dbs_info->cur_policy->cur) | |
1442 | __cpufreq_driver_target(this_dbs_info->cur_policy, | |
1443 | policy->min, CPUFREQ_RELATION_L); | |
1444 | mutex_unlock(&this_dbs_info->timer_mutex); | |
1445 | break; | |
1446 | } | |
1447 | return 0; | |
1448 | } | |
1449 | ||
1450 | /*int cpufreq_gov_dbs_get_sum_load(void) | |
1451 | { | |
1452 | return cpus_sum_load; | |
1453 | }*/ | |
1454 | ||
1455 | #if INPUT_BOOST | |
1456 | static int touch_freq_up_task(void *data) | |
1457 | { | |
1458 | struct cpufreq_policy *policy; | |
1459 | ||
1460 | while (1) { | |
1461 | policy = cpufreq_cpu_get(0); | |
1462 | if(policy != NULL) | |
1463 | { | |
1464 | dbs_freq_increase(policy, policy->max); | |
1465 | cpufreq_cpu_put(policy); | |
1466 | } | |
1467 | set_current_state(TASK_INTERRUPTIBLE); | |
1468 | schedule(); | |
1469 | ||
1470 | if (kthread_should_stop()) | |
1471 | break; | |
1472 | } | |
1473 | ||
1474 | return 0; | |
1475 | } | |
1476 | #endif | |
1477 | ||
1478 | static int __init cpufreq_gov_dbs_init(void) | |
1479 | { | |
1480 | u64 idle_time; | |
1481 | int cpu = get_cpu(); | |
1482 | ||
1483 | #if INPUT_BOOST | |
1484 | struct sched_param param = { .sched_priority = MAX_RT_PRIO-1 }; | |
1485 | #endif | |
1486 | ||
1487 | idle_time = get_cpu_idle_time_us(cpu, NULL); | |
1488 | put_cpu(); | |
1489 | if (idle_time != -1ULL) { | |
1490 | /* Idle micro accounting is supported. Use finer thresholds */ | |
1491 | dbs_tuners_ins.up_threshold = MICRO_FREQUENCY_UP_THRESHOLD; | |
1492 | dbs_tuners_ins.down_differential = | |
1493 | MICRO_FREQUENCY_DOWN_DIFFERENTIAL; | |
1494 | dbs_tuners_ins.cpu_up_threshold = | |
1495 | MICRO_CPU_UP_THRESHOLD; | |
1496 | dbs_tuners_ins.cpu_down_differential = | |
1497 | MICRO_CPU_DOWN_DIFFERENTIAL; | |
1498 | /* | |
1499 | * In nohz/micro accounting case we set the minimum frequency | |
1500 | * not depending on HZ, but fixed (very low). The deferred | |
1501 | * timer might skip some samples if idle/sleeping as needed. | |
1502 | */ | |
1503 | min_sampling_rate = MICRO_FREQUENCY_MIN_SAMPLE_RATE; | |
1504 | } else { | |
1505 | /* For correct statistics, we need 10 ticks for each measure */ | |
1506 | min_sampling_rate = | |
1507 | MIN_SAMPLING_RATE_RATIO * jiffies_to_usecs(10); | |
1508 | } | |
1509 | ||
1510 | dbs_tuners_ins.cpu_num_limit = num_possible_cpus(); | |
1511 | dbs_tuners_ins.cpu_num_base = 1; | |
1512 | ||
1513 | if (dbs_tuners_ins.cpu_num_limit > 1) | |
1514 | dbs_tuners_ins.is_cpu_hotplug_disable = 0; | |
1515 | ||
1516 | #ifdef CONFIG_SMP | |
1517 | INIT_DELAYED_WORK(&hp_work, hp_work_handler); | |
1518 | #endif | |
1519 | ||
1520 | ||
1521 | #if INPUT_BOOST | |
1522 | freq_up_task = kthread_create(touch_freq_up_task, NULL, | |
1523 | "touch_freq_up_task"); | |
1524 | if (IS_ERR(freq_up_task)) | |
1525 | return PTR_ERR(freq_up_task); | |
1526 | ||
1527 | sched_setscheduler_nocheck(freq_up_task, SCHED_FIFO, ¶m); | |
1528 | get_task_struct(freq_up_task); | |
1529 | #endif | |
1530 | ||
1531 | #ifdef DEBUG_LOG | |
1532 | printk("cpufreq_gov_dbs_init: min_sampling_rate = %d\n", min_sampling_rate); | |
1533 | printk("cpufreq_gov_dbs_init: dbs_tuners_ins.up_threshold = %d\n", dbs_tuners_ins.up_threshold); | |
1534 | printk("cpufreq_gov_dbs_init: dbs_tuners_ins.od_threshold = %d\n", dbs_tuners_ins.od_threshold); | |
1535 | printk("cpufreq_gov_dbs_init: dbs_tuners_ins.down_differential = %d\n", dbs_tuners_ins.down_differential); | |
1536 | printk("cpufreq_gov_dbs_init: dbs_tuners_ins.cpu_up_threshold = %d\n", dbs_tuners_ins.cpu_up_threshold); | |
1537 | printk("cpufreq_gov_dbs_init: dbs_tuners_ins.cpu_down_differential = %d\n", dbs_tuners_ins.cpu_down_differential); | |
1538 | printk("cpufreq_gov_dbs_init: dbs_tuners_ins.cpu_up_avg_times = %d\n", dbs_tuners_ins.cpu_up_avg_times); | |
1539 | printk("cpufreq_gov_dbs_init: dbs_tuners_ins.cpu_down_avg_times = %d\n", dbs_tuners_ins.cpu_down_avg_times); | |
1540 | printk("cpufreq_gov_dbs_init: dbs_tuners_ins.thermal_di_avg_times = %d\n", dbs_tuners_ins.thermal_dispatch_avg_times); | |
1541 | printk("cpufreq_gov_dbs_init: dbs_tuners_ins.cpu_num_limit = %d\n", dbs_tuners_ins.cpu_num_limit); | |
1542 | printk("cpufreq_gov_dbs_init: dbs_tuners_ins.cpu_num_base = %d\n", dbs_tuners_ins.cpu_num_base); | |
1543 | printk("cpufreq_gov_dbs_init: dbs_tuners_ins.is_cpu_hotplug_disable = %d\n", dbs_tuners_ins.is_cpu_hotplug_disable); | |
1544 | #if INPUT_BOOST | |
1545 | printk("cpufreq_gov_dbs_init: dbs_tuners_ins.cpu_input_boost_enable = %d\n", dbs_tuners_ins.cpu_input_boost_enable); | |
1546 | #endif /* INPUT_BOOST */ | |
1547 | #endif /* DEBUG_LOG */ | |
1548 | ||
1549 | return cpufreq_register_governor(&cpufreq_gov_balance); | |
1550 | } | |
1551 | ||
1552 | static void __exit cpufreq_gov_dbs_exit(void) | |
1553 | { | |
1554 | #ifdef CONFIG_SMP | |
1555 | cancel_delayed_work_sync(&hp_work); | |
1556 | #endif | |
1557 | ||
1558 | cpufreq_unregister_governor(&cpufreq_gov_balance); | |
1559 | ||
1560 | #if INPUT_BOOST | |
1561 | kthread_stop(freq_up_task); | |
1562 | put_task_struct(freq_up_task); | |
1563 | #endif | |
1564 | } | |
1565 | ||
1566 | ||
1567 | MODULE_AUTHOR("Venkatesh Pallipadi <venkatesh.pallipadi@intel.com>"); | |
1568 | MODULE_AUTHOR("Alexey Starikovskiy <alexey.y.starikovskiy@intel.com>"); | |
1569 | MODULE_DESCRIPTION("'cpufreq_balance' - A dynamic cpufreq governor for " | |
1570 | "Low Latency Frequency Transition capable processors"); | |
1571 | MODULE_LICENSE("GPL"); | |
1572 | ||
1573 | #ifdef CONFIG_CPU_FREQ_DEFAULT_GOV_BALANCE | |
1574 | fs_initcall(cpufreq_gov_dbs_init); | |
1575 | #else | |
1576 | module_init(cpufreq_gov_dbs_init); | |
1577 | #endif | |
1578 | module_exit(cpufreq_gov_dbs_exit); |