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1da177e4 LT |
1 | /* |
2 | * drivers/cpufreq/cpufreq_ondemand.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 | ||
4471a34f VK |
13 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
14 | ||
1da177e4 | 15 | #include <linux/cpufreq.h> |
4471a34f VK |
16 | #include <linux/init.h> |
17 | #include <linux/kernel.h> | |
1da177e4 | 18 | #include <linux/kernel_stat.h> |
4471a34f VK |
19 | #include <linux/kobject.h> |
20 | #include <linux/module.h> | |
3fc54d37 | 21 | #include <linux/mutex.h> |
4471a34f VK |
22 | #include <linux/percpu-defs.h> |
23 | #include <linux/sysfs.h> | |
80800913 | 24 | #include <linux/tick.h> |
4471a34f | 25 | #include <linux/types.h> |
1da177e4 | 26 | |
4471a34f | 27 | #include "cpufreq_governor.h" |
1da177e4 | 28 | |
06eb09d1 | 29 | /* On-demand governor macros */ |
e9d95bf7 | 30 | #define DEF_FREQUENCY_DOWN_DIFFERENTIAL (10) |
1da177e4 | 31 | #define DEF_FREQUENCY_UP_THRESHOLD (80) |
3f78a9f7 DN |
32 | #define DEF_SAMPLING_DOWN_FACTOR (1) |
33 | #define MAX_SAMPLING_DOWN_FACTOR (100000) | |
80800913 | 34 | #define MICRO_FREQUENCY_DOWN_DIFFERENTIAL (3) |
35 | #define MICRO_FREQUENCY_UP_THRESHOLD (95) | |
cef9615a | 36 | #define MICRO_FREQUENCY_MIN_SAMPLE_RATE (10000) |
c29f1403 | 37 | #define MIN_FREQUENCY_UP_THRESHOLD (11) |
1da177e4 LT |
38 | #define MAX_FREQUENCY_UP_THRESHOLD (100) |
39 | ||
4471a34f VK |
40 | static struct dbs_data od_dbs_data; |
41 | static DEFINE_PER_CPU(struct od_cpu_dbs_info_s, od_cpu_dbs_info); | |
1da177e4 | 42 | |
3e33ee9e FB |
43 | #ifndef CONFIG_CPU_FREQ_DEFAULT_GOV_ONDEMAND |
44 | static struct cpufreq_governor cpufreq_gov_ondemand; | |
45 | #endif | |
46 | ||
4471a34f | 47 | static struct od_dbs_tuners od_tuners = { |
32ee8c3e | 48 | .up_threshold = DEF_FREQUENCY_UP_THRESHOLD, |
3f78a9f7 | 49 | .sampling_down_factor = DEF_SAMPLING_DOWN_FACTOR, |
4bd4e428 SK |
50 | .adj_up_threshold = DEF_FREQUENCY_UP_THRESHOLD - |
51 | DEF_FREQUENCY_DOWN_DIFFERENTIAL, | |
9cbad61b | 52 | .ignore_nice = 0, |
05ca0350 | 53 | .powersave_bias = 0, |
1da177e4 LT |
54 | }; |
55 | ||
4471a34f | 56 | static void ondemand_powersave_bias_init_cpu(int cpu) |
6b8fcd90 | 57 | { |
4471a34f | 58 | struct od_cpu_dbs_info_s *dbs_info = &per_cpu(od_cpu_dbs_info, cpu); |
6b8fcd90 | 59 | |
4471a34f VK |
60 | dbs_info->freq_table = cpufreq_frequency_get_table(cpu); |
61 | dbs_info->freq_lo = 0; | |
62 | } | |
6b8fcd90 | 63 | |
4471a34f VK |
64 | /* |
65 | * Not all CPUs want IO time to be accounted as busy; this depends on how | |
66 | * efficient idling at a higher frequency/voltage is. | |
67 | * Pavel Machek says this is not so for various generations of AMD and old | |
68 | * Intel systems. | |
06eb09d1 | 69 | * Mike Chan (android.com) claims this is also not true for ARM. |
4471a34f VK |
70 | * Because of this, whitelist specific known (series) of CPUs by default, and |
71 | * leave all others up to the user. | |
72 | */ | |
73 | static int should_io_be_busy(void) | |
74 | { | |
75 | #if defined(CONFIG_X86) | |
76 | /* | |
06eb09d1 | 77 | * For Intel, Core 2 (model 15) and later have an efficient idle. |
4471a34f VK |
78 | */ |
79 | if (boot_cpu_data.x86_vendor == X86_VENDOR_INTEL && | |
80 | boot_cpu_data.x86 == 6 && | |
81 | boot_cpu_data.x86_model >= 15) | |
82 | return 1; | |
83 | #endif | |
84 | return 0; | |
6b8fcd90 AV |
85 | } |
86 | ||
05ca0350 AS |
87 | /* |
88 | * Find right freq to be set now with powersave_bias on. | |
89 | * Returns the freq_hi to be used right now and will set freq_hi_jiffies, | |
90 | * freq_lo, and freq_lo_jiffies in percpu area for averaging freqs. | |
91 | */ | |
b5ecf60f | 92 | static unsigned int powersave_bias_target(struct cpufreq_policy *policy, |
4471a34f | 93 | unsigned int freq_next, unsigned int relation) |
05ca0350 AS |
94 | { |
95 | unsigned int freq_req, freq_reduc, freq_avg; | |
96 | unsigned int freq_hi, freq_lo; | |
97 | unsigned int index = 0; | |
98 | unsigned int jiffies_total, jiffies_hi, jiffies_lo; | |
4471a34f | 99 | struct od_cpu_dbs_info_s *dbs_info = &per_cpu(od_cpu_dbs_info, |
245b2e70 | 100 | policy->cpu); |
05ca0350 AS |
101 | |
102 | if (!dbs_info->freq_table) { | |
103 | dbs_info->freq_lo = 0; | |
104 | dbs_info->freq_lo_jiffies = 0; | |
105 | return freq_next; | |
106 | } | |
107 | ||
108 | cpufreq_frequency_table_target(policy, dbs_info->freq_table, freq_next, | |
109 | relation, &index); | |
110 | freq_req = dbs_info->freq_table[index].frequency; | |
4471a34f | 111 | freq_reduc = freq_req * od_tuners.powersave_bias / 1000; |
05ca0350 AS |
112 | freq_avg = freq_req - freq_reduc; |
113 | ||
114 | /* Find freq bounds for freq_avg in freq_table */ | |
115 | index = 0; | |
116 | cpufreq_frequency_table_target(policy, dbs_info->freq_table, freq_avg, | |
117 | CPUFREQ_RELATION_H, &index); | |
118 | freq_lo = dbs_info->freq_table[index].frequency; | |
119 | index = 0; | |
120 | cpufreq_frequency_table_target(policy, dbs_info->freq_table, freq_avg, | |
121 | CPUFREQ_RELATION_L, &index); | |
122 | freq_hi = dbs_info->freq_table[index].frequency; | |
123 | ||
124 | /* Find out how long we have to be in hi and lo freqs */ | |
125 | if (freq_hi == freq_lo) { | |
126 | dbs_info->freq_lo = 0; | |
127 | dbs_info->freq_lo_jiffies = 0; | |
128 | return freq_lo; | |
129 | } | |
4471a34f | 130 | jiffies_total = usecs_to_jiffies(od_tuners.sampling_rate); |
05ca0350 AS |
131 | jiffies_hi = (freq_avg - freq_lo) * jiffies_total; |
132 | jiffies_hi += ((freq_hi - freq_lo) / 2); | |
133 | jiffies_hi /= (freq_hi - freq_lo); | |
134 | jiffies_lo = jiffies_total - jiffies_hi; | |
135 | dbs_info->freq_lo = freq_lo; | |
136 | dbs_info->freq_lo_jiffies = jiffies_lo; | |
137 | dbs_info->freq_hi_jiffies = jiffies_hi; | |
138 | return freq_hi; | |
139 | } | |
140 | ||
141 | static void ondemand_powersave_bias_init(void) | |
142 | { | |
143 | int i; | |
144 | for_each_online_cpu(i) { | |
5a75c828 | 145 | ondemand_powersave_bias_init_cpu(i); |
05ca0350 AS |
146 | } |
147 | } | |
148 | ||
4471a34f VK |
149 | static void dbs_freq_increase(struct cpufreq_policy *p, unsigned int freq) |
150 | { | |
151 | if (od_tuners.powersave_bias) | |
152 | freq = powersave_bias_target(p, freq, CPUFREQ_RELATION_H); | |
153 | else if (p->cur == p->max) | |
154 | return; | |
0e625ac1 | 155 | |
4471a34f VK |
156 | __cpufreq_driver_target(p, freq, od_tuners.powersave_bias ? |
157 | CPUFREQ_RELATION_L : CPUFREQ_RELATION_H); | |
158 | } | |
159 | ||
160 | /* | |
161 | * Every sampling_rate, we check, if current idle time is less than 20% | |
06eb09d1 SK |
162 | * (default), then we try to increase frequency. Every sampling_rate, we look |
163 | * for the lowest frequency which can sustain the load while keeping idle time | |
4471a34f VK |
164 | * over 30%. If such a frequency exist, we try to decrease to this frequency. |
165 | * | |
166 | * Any frequency increase takes it to the maximum frequency. Frequency reduction | |
167 | * happens at minimum steps of 5% (default) of current frequency | |
168 | */ | |
169 | static void od_check_cpu(int cpu, unsigned int load_freq) | |
1da177e4 | 170 | { |
4471a34f VK |
171 | struct od_cpu_dbs_info_s *dbs_info = &per_cpu(od_cpu_dbs_info, cpu); |
172 | struct cpufreq_policy *policy = dbs_info->cdbs.cur_policy; | |
173 | ||
174 | dbs_info->freq_lo = 0; | |
175 | ||
176 | /* Check for frequency increase */ | |
177 | if (load_freq > od_tuners.up_threshold * policy->cur) { | |
178 | /* If switching to max speed, apply sampling_down_factor */ | |
179 | if (policy->cur < policy->max) | |
180 | dbs_info->rate_mult = | |
181 | od_tuners.sampling_down_factor; | |
182 | dbs_freq_increase(policy, policy->max); | |
183 | return; | |
184 | } | |
185 | ||
186 | /* Check for frequency decrease */ | |
187 | /* if we cannot reduce the frequency anymore, break out early */ | |
188 | if (policy->cur == policy->min) | |
189 | return; | |
190 | ||
191 | /* | |
192 | * The optimal frequency is the frequency that is the lowest that can | |
193 | * support the current CPU usage without triggering the up policy. To be | |
194 | * safe, we focus 10 points under the threshold. | |
195 | */ | |
4bd4e428 | 196 | if (load_freq < od_tuners.adj_up_threshold * policy->cur) { |
4471a34f | 197 | unsigned int freq_next; |
4bd4e428 | 198 | freq_next = load_freq / od_tuners.adj_up_threshold; |
4471a34f VK |
199 | |
200 | /* No longer fully busy, reset rate_mult */ | |
201 | dbs_info->rate_mult = 1; | |
202 | ||
203 | if (freq_next < policy->min) | |
204 | freq_next = policy->min; | |
205 | ||
206 | if (!od_tuners.powersave_bias) { | |
207 | __cpufreq_driver_target(policy, freq_next, | |
208 | CPUFREQ_RELATION_L); | |
209 | } else { | |
210 | int freq = powersave_bias_target(policy, freq_next, | |
211 | CPUFREQ_RELATION_L); | |
212 | __cpufreq_driver_target(policy, freq, | |
213 | CPUFREQ_RELATION_L); | |
214 | } | |
215 | } | |
1da177e4 LT |
216 | } |
217 | ||
4447266b | 218 | static void od_dbs_timer(struct work_struct *work) |
4471a34f | 219 | { |
4447266b VK |
220 | struct delayed_work *dw = to_delayed_work(work); |
221 | struct od_cpu_dbs_info_s *dbs_info = | |
222 | container_of(work, struct od_cpu_dbs_info_s, cdbs.work.work); | |
09dca5ae | 223 | unsigned int cpu = dbs_info->cdbs.cur_policy->cpu; |
4447266b VK |
224 | struct od_cpu_dbs_info_s *core_dbs_info = &per_cpu(od_cpu_dbs_info, |
225 | cpu); | |
226 | int delay, sample_type = core_dbs_info->sample_type; | |
227 | bool eval_load; | |
228 | ||
229 | mutex_lock(&core_dbs_info->cdbs.timer_mutex); | |
230 | eval_load = need_load_eval(&core_dbs_info->cdbs, | |
231 | od_tuners.sampling_rate); | |
1da177e4 | 232 | |
4471a34f | 233 | /* Common NORMAL_SAMPLE setup */ |
4447266b | 234 | core_dbs_info->sample_type = OD_NORMAL_SAMPLE; |
4471a34f | 235 | if (sample_type == OD_SUB_SAMPLE) { |
4447266b VK |
236 | delay = core_dbs_info->freq_lo_jiffies; |
237 | if (eval_load) | |
238 | __cpufreq_driver_target(core_dbs_info->cdbs.cur_policy, | |
239 | core_dbs_info->freq_lo, | |
da53d61e | 240 | CPUFREQ_RELATION_H); |
4471a34f | 241 | } else { |
4447266b | 242 | if (eval_load) |
da53d61e | 243 | dbs_check_cpu(&od_dbs_data, cpu); |
4447266b | 244 | if (core_dbs_info->freq_lo) { |
4471a34f | 245 | /* Setup timer for SUB_SAMPLE */ |
4447266b VK |
246 | core_dbs_info->sample_type = OD_SUB_SAMPLE; |
247 | delay = core_dbs_info->freq_hi_jiffies; | |
4471a34f | 248 | } else { |
d3c31a77 | 249 | delay = delay_for_sampling_rate(od_tuners.sampling_rate |
4447266b | 250 | * core_dbs_info->rate_mult); |
4471a34f VK |
251 | } |
252 | } | |
253 | ||
da53d61e | 254 | schedule_delayed_work_on(smp_processor_id(), dw, delay); |
4447266b | 255 | mutex_unlock(&core_dbs_info->cdbs.timer_mutex); |
da53d61e FB |
256 | } |
257 | ||
4471a34f VK |
258 | /************************** sysfs interface ************************/ |
259 | ||
260 | static ssize_t show_sampling_rate_min(struct kobject *kobj, | |
261 | struct attribute *attr, char *buf) | |
262 | { | |
263 | return sprintf(buf, "%u\n", od_dbs_data.min_sampling_rate); | |
1da177e4 | 264 | } |
1da177e4 | 265 | |
fd0ef7a0 MH |
266 | /** |
267 | * update_sampling_rate - update sampling rate effective immediately if needed. | |
268 | * @new_rate: new sampling rate | |
269 | * | |
06eb09d1 | 270 | * If new rate is smaller than the old, simply updating |
4471a34f VK |
271 | * dbs_tuners_int.sampling_rate might not be appropriate. For example, if the |
272 | * original sampling_rate was 1 second and the requested new sampling rate is 10 | |
273 | * ms because the user needs immediate reaction from ondemand governor, but not | |
274 | * sure if higher frequency will be required or not, then, the governor may | |
275 | * change the sampling rate too late; up to 1 second later. Thus, if we are | |
276 | * reducing the sampling rate, we need to make the new value effective | |
277 | * immediately. | |
fd0ef7a0 MH |
278 | */ |
279 | static void update_sampling_rate(unsigned int new_rate) | |
280 | { | |
281 | int cpu; | |
282 | ||
4471a34f VK |
283 | od_tuners.sampling_rate = new_rate = max(new_rate, |
284 | od_dbs_data.min_sampling_rate); | |
fd0ef7a0 MH |
285 | |
286 | for_each_online_cpu(cpu) { | |
287 | struct cpufreq_policy *policy; | |
4471a34f | 288 | struct od_cpu_dbs_info_s *dbs_info; |
fd0ef7a0 MH |
289 | unsigned long next_sampling, appointed_at; |
290 | ||
291 | policy = cpufreq_cpu_get(cpu); | |
292 | if (!policy) | |
293 | continue; | |
3e33ee9e FB |
294 | if (policy->governor != &cpufreq_gov_ondemand) { |
295 | cpufreq_cpu_put(policy); | |
296 | continue; | |
297 | } | |
8ee2ec51 | 298 | dbs_info = &per_cpu(od_cpu_dbs_info, cpu); |
fd0ef7a0 MH |
299 | cpufreq_cpu_put(policy); |
300 | ||
4471a34f | 301 | mutex_lock(&dbs_info->cdbs.timer_mutex); |
fd0ef7a0 | 302 | |
4471a34f VK |
303 | if (!delayed_work_pending(&dbs_info->cdbs.work)) { |
304 | mutex_unlock(&dbs_info->cdbs.timer_mutex); | |
fd0ef7a0 MH |
305 | continue; |
306 | } | |
307 | ||
4471a34f VK |
308 | next_sampling = jiffies + usecs_to_jiffies(new_rate); |
309 | appointed_at = dbs_info->cdbs.work.timer.expires; | |
fd0ef7a0 MH |
310 | |
311 | if (time_before(next_sampling, appointed_at)) { | |
312 | ||
4471a34f VK |
313 | mutex_unlock(&dbs_info->cdbs.timer_mutex); |
314 | cancel_delayed_work_sync(&dbs_info->cdbs.work); | |
315 | mutex_lock(&dbs_info->cdbs.timer_mutex); | |
fd0ef7a0 | 316 | |
8ee2ec51 | 317 | schedule_delayed_work_on(cpu, &dbs_info->cdbs.work, |
4471a34f | 318 | usecs_to_jiffies(new_rate)); |
fd0ef7a0 MH |
319 | |
320 | } | |
4471a34f | 321 | mutex_unlock(&dbs_info->cdbs.timer_mutex); |
fd0ef7a0 MH |
322 | } |
323 | } | |
324 | ||
0e625ac1 TR |
325 | static ssize_t store_sampling_rate(struct kobject *a, struct attribute *b, |
326 | const char *buf, size_t count) | |
1da177e4 LT |
327 | { |
328 | unsigned int input; | |
329 | int ret; | |
ffac80e9 | 330 | ret = sscanf(buf, "%u", &input); |
5a75c828 | 331 | if (ret != 1) |
332 | return -EINVAL; | |
fd0ef7a0 | 333 | update_sampling_rate(input); |
1da177e4 LT |
334 | return count; |
335 | } | |
336 | ||
19379b11 AV |
337 | static ssize_t store_io_is_busy(struct kobject *a, struct attribute *b, |
338 | const char *buf, size_t count) | |
339 | { | |
340 | unsigned int input; | |
341 | int ret; | |
342 | ||
343 | ret = sscanf(buf, "%u", &input); | |
344 | if (ret != 1) | |
345 | return -EINVAL; | |
4471a34f | 346 | od_tuners.io_is_busy = !!input; |
19379b11 AV |
347 | return count; |
348 | } | |
349 | ||
0e625ac1 TR |
350 | static ssize_t store_up_threshold(struct kobject *a, struct attribute *b, |
351 | const char *buf, size_t count) | |
1da177e4 LT |
352 | { |
353 | unsigned int input; | |
354 | int ret; | |
ffac80e9 | 355 | ret = sscanf(buf, "%u", &input); |
1da177e4 | 356 | |
32ee8c3e | 357 | if (ret != 1 || input > MAX_FREQUENCY_UP_THRESHOLD || |
c29f1403 | 358 | input < MIN_FREQUENCY_UP_THRESHOLD) { |
1da177e4 LT |
359 | return -EINVAL; |
360 | } | |
4bd4e428 SK |
361 | /* Calculate the new adj_up_threshold */ |
362 | od_tuners.adj_up_threshold += input; | |
363 | od_tuners.adj_up_threshold -= od_tuners.up_threshold; | |
364 | ||
4471a34f | 365 | od_tuners.up_threshold = input; |
1da177e4 LT |
366 | return count; |
367 | } | |
368 | ||
3f78a9f7 DN |
369 | static ssize_t store_sampling_down_factor(struct kobject *a, |
370 | struct attribute *b, const char *buf, size_t count) | |
371 | { | |
372 | unsigned int input, j; | |
373 | int ret; | |
374 | ret = sscanf(buf, "%u", &input); | |
375 | ||
376 | if (ret != 1 || input > MAX_SAMPLING_DOWN_FACTOR || input < 1) | |
377 | return -EINVAL; | |
4471a34f | 378 | od_tuners.sampling_down_factor = input; |
3f78a9f7 DN |
379 | |
380 | /* Reset down sampling multiplier in case it was active */ | |
381 | for_each_online_cpu(j) { | |
4471a34f VK |
382 | struct od_cpu_dbs_info_s *dbs_info = &per_cpu(od_cpu_dbs_info, |
383 | j); | |
3f78a9f7 DN |
384 | dbs_info->rate_mult = 1; |
385 | } | |
3f78a9f7 DN |
386 | return count; |
387 | } | |
388 | ||
0e625ac1 TR |
389 | static ssize_t store_ignore_nice_load(struct kobject *a, struct attribute *b, |
390 | const char *buf, size_t count) | |
3d5ee9e5 DJ |
391 | { |
392 | unsigned int input; | |
393 | int ret; | |
394 | ||
395 | unsigned int j; | |
32ee8c3e | 396 | |
ffac80e9 | 397 | ret = sscanf(buf, "%u", &input); |
2b03f891 | 398 | if (ret != 1) |
3d5ee9e5 DJ |
399 | return -EINVAL; |
400 | ||
2b03f891 | 401 | if (input > 1) |
3d5ee9e5 | 402 | input = 1; |
32ee8c3e | 403 | |
4471a34f | 404 | if (input == od_tuners.ignore_nice) { /* nothing to do */ |
3d5ee9e5 DJ |
405 | return count; |
406 | } | |
4471a34f | 407 | od_tuners.ignore_nice = input; |
3d5ee9e5 | 408 | |
ccb2fe20 | 409 | /* we need to re-evaluate prev_cpu_idle */ |
dac1c1a5 | 410 | for_each_online_cpu(j) { |
4471a34f | 411 | struct od_cpu_dbs_info_s *dbs_info; |
245b2e70 | 412 | dbs_info = &per_cpu(od_cpu_dbs_info, j); |
4471a34f VK |
413 | dbs_info->cdbs.prev_cpu_idle = get_cpu_idle_time(j, |
414 | &dbs_info->cdbs.prev_cpu_wall); | |
415 | if (od_tuners.ignore_nice) | |
416 | dbs_info->cdbs.prev_cpu_nice = | |
417 | kcpustat_cpu(j).cpustat[CPUTIME_NICE]; | |
1ca3abdb | 418 | |
3d5ee9e5 | 419 | } |
3d5ee9e5 DJ |
420 | return count; |
421 | } | |
422 | ||
0e625ac1 TR |
423 | static ssize_t store_powersave_bias(struct kobject *a, struct attribute *b, |
424 | const char *buf, size_t count) | |
05ca0350 AS |
425 | { |
426 | unsigned int input; | |
427 | int ret; | |
428 | ret = sscanf(buf, "%u", &input); | |
429 | ||
430 | if (ret != 1) | |
431 | return -EINVAL; | |
432 | ||
433 | if (input > 1000) | |
434 | input = 1000; | |
435 | ||
4471a34f | 436 | od_tuners.powersave_bias = input; |
05ca0350 | 437 | ondemand_powersave_bias_init(); |
05ca0350 AS |
438 | return count; |
439 | } | |
440 | ||
4471a34f VK |
441 | show_one(od, sampling_rate, sampling_rate); |
442 | show_one(od, io_is_busy, io_is_busy); | |
443 | show_one(od, up_threshold, up_threshold); | |
444 | show_one(od, sampling_down_factor, sampling_down_factor); | |
445 | show_one(od, ignore_nice_load, ignore_nice); | |
446 | show_one(od, powersave_bias, powersave_bias); | |
447 | ||
6dad2a29 | 448 | define_one_global_rw(sampling_rate); |
07d77759 | 449 | define_one_global_rw(io_is_busy); |
6dad2a29 | 450 | define_one_global_rw(up_threshold); |
3f78a9f7 | 451 | define_one_global_rw(sampling_down_factor); |
6dad2a29 BP |
452 | define_one_global_rw(ignore_nice_load); |
453 | define_one_global_rw(powersave_bias); | |
4471a34f | 454 | define_one_global_ro(sampling_rate_min); |
1da177e4 | 455 | |
2b03f891 | 456 | static struct attribute *dbs_attributes[] = { |
1da177e4 LT |
457 | &sampling_rate_min.attr, |
458 | &sampling_rate.attr, | |
1da177e4 | 459 | &up_threshold.attr, |
3f78a9f7 | 460 | &sampling_down_factor.attr, |
001893cd | 461 | &ignore_nice_load.attr, |
05ca0350 | 462 | &powersave_bias.attr, |
19379b11 | 463 | &io_is_busy.attr, |
1da177e4 LT |
464 | NULL |
465 | }; | |
466 | ||
4471a34f | 467 | static struct attribute_group od_attr_group = { |
1da177e4 LT |
468 | .attrs = dbs_attributes, |
469 | .name = "ondemand", | |
470 | }; | |
471 | ||
472 | /************************** sysfs end ************************/ | |
473 | ||
4471a34f | 474 | define_get_cpu_dbs_routines(od_cpu_dbs_info); |
6b8fcd90 | 475 | |
4471a34f VK |
476 | static struct od_ops od_ops = { |
477 | .io_busy = should_io_be_busy, | |
478 | .powersave_bias_init_cpu = ondemand_powersave_bias_init_cpu, | |
479 | .powersave_bias_target = powersave_bias_target, | |
480 | .freq_increase = dbs_freq_increase, | |
481 | }; | |
2f8a835c | 482 | |
4471a34f VK |
483 | static struct dbs_data od_dbs_data = { |
484 | .governor = GOV_ONDEMAND, | |
485 | .attr_group = &od_attr_group, | |
486 | .tuners = &od_tuners, | |
487 | .get_cpu_cdbs = get_cpu_cdbs, | |
488 | .get_cpu_dbs_info_s = get_cpu_dbs_info_s, | |
489 | .gov_dbs_timer = od_dbs_timer, | |
490 | .gov_check_cpu = od_check_cpu, | |
491 | .gov_ops = &od_ops, | |
492 | }; | |
1da177e4 | 493 | |
4471a34f VK |
494 | static int od_cpufreq_governor_dbs(struct cpufreq_policy *policy, |
495 | unsigned int event) | |
1da177e4 | 496 | { |
4471a34f | 497 | return cpufreq_governor_dbs(&od_dbs_data, policy, event); |
1da177e4 LT |
498 | } |
499 | ||
4471a34f VK |
500 | #ifndef CONFIG_CPU_FREQ_DEFAULT_GOV_ONDEMAND |
501 | static | |
19379b11 | 502 | #endif |
4471a34f VK |
503 | struct cpufreq_governor cpufreq_gov_ondemand = { |
504 | .name = "ondemand", | |
505 | .governor = od_cpufreq_governor_dbs, | |
506 | .max_transition_latency = TRANSITION_LATENCY_LIMIT, | |
507 | .owner = THIS_MODULE, | |
508 | }; | |
1da177e4 | 509 | |
1da177e4 LT |
510 | static int __init cpufreq_gov_dbs_init(void) |
511 | { | |
4f6e6b9f AR |
512 | u64 idle_time; |
513 | int cpu = get_cpu(); | |
80800913 | 514 | |
4471a34f | 515 | mutex_init(&od_dbs_data.mutex); |
21f2e3c8 | 516 | idle_time = get_cpu_idle_time_us(cpu, NULL); |
4f6e6b9f | 517 | put_cpu(); |
80800913 | 518 | if (idle_time != -1ULL) { |
519 | /* Idle micro accounting is supported. Use finer thresholds */ | |
4471a34f | 520 | od_tuners.up_threshold = MICRO_FREQUENCY_UP_THRESHOLD; |
4bd4e428 SK |
521 | od_tuners.adj_up_threshold = MICRO_FREQUENCY_UP_THRESHOLD - |
522 | MICRO_FREQUENCY_DOWN_DIFFERENTIAL; | |
cef9615a | 523 | /* |
bd74b32b | 524 | * In nohz/micro accounting case we set the minimum frequency |
cef9615a TR |
525 | * not depending on HZ, but fixed (very low). The deferred |
526 | * timer might skip some samples if idle/sleeping as needed. | |
527 | */ | |
4471a34f | 528 | od_dbs_data.min_sampling_rate = MICRO_FREQUENCY_MIN_SAMPLE_RATE; |
cef9615a TR |
529 | } else { |
530 | /* For correct statistics, we need 10 ticks for each measure */ | |
4471a34f VK |
531 | od_dbs_data.min_sampling_rate = MIN_SAMPLING_RATE_RATIO * |
532 | jiffies_to_usecs(10); | |
80800913 | 533 | } |
888a794c | 534 | |
57df5573 | 535 | return cpufreq_register_governor(&cpufreq_gov_ondemand); |
1da177e4 LT |
536 | } |
537 | ||
538 | static void __exit cpufreq_gov_dbs_exit(void) | |
539 | { | |
1c256245 | 540 | cpufreq_unregister_governor(&cpufreq_gov_ondemand); |
1da177e4 LT |
541 | } |
542 | ||
ffac80e9 VP |
543 | MODULE_AUTHOR("Venkatesh Pallipadi <venkatesh.pallipadi@intel.com>"); |
544 | MODULE_AUTHOR("Alexey Starikovskiy <alexey.y.starikovskiy@intel.com>"); | |
545 | MODULE_DESCRIPTION("'cpufreq_ondemand' - A dynamic cpufreq governor for " | |
2b03f891 | 546 | "Low Latency Frequency Transition capable processors"); |
ffac80e9 | 547 | MODULE_LICENSE("GPL"); |
1da177e4 | 548 | |
6915719b JW |
549 | #ifdef CONFIG_CPU_FREQ_DEFAULT_GOV_ONDEMAND |
550 | fs_initcall(cpufreq_gov_dbs_init); | |
551 | #else | |
1da177e4 | 552 | module_init(cpufreq_gov_dbs_init); |
6915719b | 553 | #endif |
1da177e4 | 554 | module_exit(cpufreq_gov_dbs_exit); |