Commit | Line | Data |
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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 | 22 | #include <linux/percpu-defs.h> |
4d5dcc42 | 23 | #include <linux/slab.h> |
4471a34f | 24 | #include <linux/sysfs.h> |
80800913 | 25 | #include <linux/tick.h> |
4471a34f | 26 | #include <linux/types.h> |
1da177e4 | 27 | |
4471a34f | 28 | #include "cpufreq_governor.h" |
1da177e4 | 29 | |
06eb09d1 | 30 | /* On-demand governor macros */ |
e9d95bf7 | 31 | #define DEF_FREQUENCY_DOWN_DIFFERENTIAL (10) |
1da177e4 | 32 | #define DEF_FREQUENCY_UP_THRESHOLD (80) |
3f78a9f7 DN |
33 | #define DEF_SAMPLING_DOWN_FACTOR (1) |
34 | #define MAX_SAMPLING_DOWN_FACTOR (100000) | |
80800913 | 35 | #define MICRO_FREQUENCY_DOWN_DIFFERENTIAL (3) |
36 | #define MICRO_FREQUENCY_UP_THRESHOLD (95) | |
cef9615a | 37 | #define MICRO_FREQUENCY_MIN_SAMPLE_RATE (10000) |
c29f1403 | 38 | #define MIN_FREQUENCY_UP_THRESHOLD (11) |
1da177e4 LT |
39 | #define MAX_FREQUENCY_UP_THRESHOLD (100) |
40 | ||
4471a34f | 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 void ondemand_powersave_bias_init_cpu(int cpu) |
6b8fcd90 | 48 | { |
4471a34f | 49 | struct od_cpu_dbs_info_s *dbs_info = &per_cpu(od_cpu_dbs_info, cpu); |
6b8fcd90 | 50 | |
4471a34f VK |
51 | dbs_info->freq_table = cpufreq_frequency_get_table(cpu); |
52 | dbs_info->freq_lo = 0; | |
53 | } | |
6b8fcd90 | 54 | |
4471a34f VK |
55 | /* |
56 | * Not all CPUs want IO time to be accounted as busy; this depends on how | |
57 | * efficient idling at a higher frequency/voltage is. | |
58 | * Pavel Machek says this is not so for various generations of AMD and old | |
59 | * Intel systems. | |
06eb09d1 | 60 | * Mike Chan (android.com) claims this is also not true for ARM. |
4471a34f VK |
61 | * Because of this, whitelist specific known (series) of CPUs by default, and |
62 | * leave all others up to the user. | |
63 | */ | |
64 | static int should_io_be_busy(void) | |
65 | { | |
66 | #if defined(CONFIG_X86) | |
67 | /* | |
06eb09d1 | 68 | * For Intel, Core 2 (model 15) and later have an efficient idle. |
4471a34f VK |
69 | */ |
70 | if (boot_cpu_data.x86_vendor == X86_VENDOR_INTEL && | |
71 | boot_cpu_data.x86 == 6 && | |
72 | boot_cpu_data.x86_model >= 15) | |
73 | return 1; | |
74 | #endif | |
75 | return 0; | |
6b8fcd90 AV |
76 | } |
77 | ||
05ca0350 AS |
78 | /* |
79 | * Find right freq to be set now with powersave_bias on. | |
80 | * Returns the freq_hi to be used right now and will set freq_hi_jiffies, | |
81 | * freq_lo, and freq_lo_jiffies in percpu area for averaging freqs. | |
82 | */ | |
b5ecf60f | 83 | static unsigned int powersave_bias_target(struct cpufreq_policy *policy, |
4471a34f | 84 | unsigned int freq_next, unsigned int relation) |
05ca0350 AS |
85 | { |
86 | unsigned int freq_req, freq_reduc, freq_avg; | |
87 | unsigned int freq_hi, freq_lo; | |
88 | unsigned int index = 0; | |
89 | unsigned int jiffies_total, jiffies_hi, jiffies_lo; | |
4471a34f | 90 | struct od_cpu_dbs_info_s *dbs_info = &per_cpu(od_cpu_dbs_info, |
245b2e70 | 91 | policy->cpu); |
4d5dcc42 VK |
92 | struct dbs_data *dbs_data = policy->governor_data; |
93 | struct od_dbs_tuners *od_tuners = dbs_data->tuners; | |
05ca0350 AS |
94 | |
95 | if (!dbs_info->freq_table) { | |
96 | dbs_info->freq_lo = 0; | |
97 | dbs_info->freq_lo_jiffies = 0; | |
98 | return freq_next; | |
99 | } | |
100 | ||
101 | cpufreq_frequency_table_target(policy, dbs_info->freq_table, freq_next, | |
102 | relation, &index); | |
103 | freq_req = dbs_info->freq_table[index].frequency; | |
4d5dcc42 | 104 | freq_reduc = freq_req * od_tuners->powersave_bias / 1000; |
05ca0350 AS |
105 | freq_avg = freq_req - freq_reduc; |
106 | ||
107 | /* Find freq bounds for freq_avg in freq_table */ | |
108 | index = 0; | |
109 | cpufreq_frequency_table_target(policy, dbs_info->freq_table, freq_avg, | |
110 | CPUFREQ_RELATION_H, &index); | |
111 | freq_lo = dbs_info->freq_table[index].frequency; | |
112 | index = 0; | |
113 | cpufreq_frequency_table_target(policy, dbs_info->freq_table, freq_avg, | |
114 | CPUFREQ_RELATION_L, &index); | |
115 | freq_hi = dbs_info->freq_table[index].frequency; | |
116 | ||
117 | /* Find out how long we have to be in hi and lo freqs */ | |
118 | if (freq_hi == freq_lo) { | |
119 | dbs_info->freq_lo = 0; | |
120 | dbs_info->freq_lo_jiffies = 0; | |
121 | return freq_lo; | |
122 | } | |
4d5dcc42 | 123 | jiffies_total = usecs_to_jiffies(od_tuners->sampling_rate); |
05ca0350 AS |
124 | jiffies_hi = (freq_avg - freq_lo) * jiffies_total; |
125 | jiffies_hi += ((freq_hi - freq_lo) / 2); | |
126 | jiffies_hi /= (freq_hi - freq_lo); | |
127 | jiffies_lo = jiffies_total - jiffies_hi; | |
128 | dbs_info->freq_lo = freq_lo; | |
129 | dbs_info->freq_lo_jiffies = jiffies_lo; | |
130 | dbs_info->freq_hi_jiffies = jiffies_hi; | |
131 | return freq_hi; | |
132 | } | |
133 | ||
134 | static void ondemand_powersave_bias_init(void) | |
135 | { | |
136 | int i; | |
137 | for_each_online_cpu(i) { | |
5a75c828 | 138 | ondemand_powersave_bias_init_cpu(i); |
05ca0350 AS |
139 | } |
140 | } | |
141 | ||
4471a34f VK |
142 | static void dbs_freq_increase(struct cpufreq_policy *p, unsigned int freq) |
143 | { | |
4d5dcc42 VK |
144 | struct dbs_data *dbs_data = p->governor_data; |
145 | struct od_dbs_tuners *od_tuners = dbs_data->tuners; | |
146 | ||
147 | if (od_tuners->powersave_bias) | |
4471a34f VK |
148 | freq = powersave_bias_target(p, freq, CPUFREQ_RELATION_H); |
149 | else if (p->cur == p->max) | |
150 | return; | |
0e625ac1 | 151 | |
4d5dcc42 | 152 | __cpufreq_driver_target(p, freq, od_tuners->powersave_bias ? |
4471a34f VK |
153 | CPUFREQ_RELATION_L : CPUFREQ_RELATION_H); |
154 | } | |
155 | ||
156 | /* | |
157 | * Every sampling_rate, we check, if current idle time is less than 20% | |
06eb09d1 SK |
158 | * (default), then we try to increase frequency. Every sampling_rate, we look |
159 | * for the lowest frequency which can sustain the load while keeping idle time | |
4471a34f VK |
160 | * over 30%. If such a frequency exist, we try to decrease to this frequency. |
161 | * | |
162 | * Any frequency increase takes it to the maximum frequency. Frequency reduction | |
163 | * happens at minimum steps of 5% (default) of current frequency | |
164 | */ | |
165 | static void od_check_cpu(int cpu, unsigned int load_freq) | |
1da177e4 | 166 | { |
4471a34f VK |
167 | struct od_cpu_dbs_info_s *dbs_info = &per_cpu(od_cpu_dbs_info, cpu); |
168 | struct cpufreq_policy *policy = dbs_info->cdbs.cur_policy; | |
4d5dcc42 VK |
169 | struct dbs_data *dbs_data = policy->governor_data; |
170 | struct od_dbs_tuners *od_tuners = dbs_data->tuners; | |
4471a34f VK |
171 | |
172 | dbs_info->freq_lo = 0; | |
173 | ||
174 | /* Check for frequency increase */ | |
4d5dcc42 | 175 | if (load_freq > od_tuners->up_threshold * policy->cur) { |
4471a34f VK |
176 | /* If switching to max speed, apply sampling_down_factor */ |
177 | if (policy->cur < policy->max) | |
178 | dbs_info->rate_mult = | |
4d5dcc42 | 179 | od_tuners->sampling_down_factor; |
4471a34f VK |
180 | dbs_freq_increase(policy, policy->max); |
181 | return; | |
182 | } | |
183 | ||
184 | /* Check for frequency decrease */ | |
185 | /* if we cannot reduce the frequency anymore, break out early */ | |
186 | if (policy->cur == policy->min) | |
187 | return; | |
188 | ||
189 | /* | |
190 | * The optimal frequency is the frequency that is the lowest that can | |
191 | * support the current CPU usage without triggering the up policy. To be | |
192 | * safe, we focus 10 points under the threshold. | |
193 | */ | |
4d5dcc42 VK |
194 | if (load_freq < od_tuners->adj_up_threshold |
195 | * policy->cur) { | |
4471a34f | 196 | unsigned int freq_next; |
4d5dcc42 | 197 | freq_next = load_freq / od_tuners->adj_up_threshold; |
4471a34f VK |
198 | |
199 | /* No longer fully busy, reset rate_mult */ | |
200 | dbs_info->rate_mult = 1; | |
201 | ||
202 | if (freq_next < policy->min) | |
203 | freq_next = policy->min; | |
204 | ||
4d5dcc42 | 205 | if (!od_tuners->powersave_bias) { |
4471a34f VK |
206 | __cpufreq_driver_target(policy, freq_next, |
207 | CPUFREQ_RELATION_L); | |
208 | } else { | |
209 | int freq = powersave_bias_target(policy, freq_next, | |
210 | CPUFREQ_RELATION_L); | |
211 | __cpufreq_driver_target(policy, freq, | |
212 | CPUFREQ_RELATION_L); | |
213 | } | |
214 | } | |
1da177e4 LT |
215 | } |
216 | ||
4447266b | 217 | static void od_dbs_timer(struct work_struct *work) |
4471a34f | 218 | { |
4447266b VK |
219 | struct delayed_work *dw = to_delayed_work(work); |
220 | struct od_cpu_dbs_info_s *dbs_info = | |
221 | container_of(work, struct od_cpu_dbs_info_s, cdbs.work.work); | |
09dca5ae | 222 | unsigned int cpu = dbs_info->cdbs.cur_policy->cpu; |
4447266b VK |
223 | struct od_cpu_dbs_info_s *core_dbs_info = &per_cpu(od_cpu_dbs_info, |
224 | cpu); | |
4d5dcc42 VK |
225 | struct dbs_data *dbs_data = dbs_info->cdbs.cur_policy->governor_data; |
226 | struct od_dbs_tuners *od_tuners = dbs_data->tuners; | |
9d445920 | 227 | int delay = 0, sample_type = core_dbs_info->sample_type; |
4447266b VK |
228 | |
229 | mutex_lock(&core_dbs_info->cdbs.timer_mutex); | |
9d445920 VK |
230 | if (!need_load_eval(&core_dbs_info->cdbs, od_tuners->sampling_rate)) |
231 | goto max_delay; | |
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 | 236 | delay = core_dbs_info->freq_lo_jiffies; |
9d445920 VK |
237 | __cpufreq_driver_target(core_dbs_info->cdbs.cur_policy, |
238 | core_dbs_info->freq_lo, CPUFREQ_RELATION_H); | |
4471a34f | 239 | } else { |
9d445920 | 240 | dbs_check_cpu(dbs_data, cpu); |
4447266b | 241 | if (core_dbs_info->freq_lo) { |
4471a34f | 242 | /* Setup timer for SUB_SAMPLE */ |
4447266b VK |
243 | core_dbs_info->sample_type = OD_SUB_SAMPLE; |
244 | delay = core_dbs_info->freq_hi_jiffies; | |
4471a34f VK |
245 | } |
246 | } | |
247 | ||
9d445920 VK |
248 | max_delay: |
249 | if (!delay) | |
250 | delay = delay_for_sampling_rate(od_tuners->sampling_rate | |
251 | * core_dbs_info->rate_mult); | |
252 | ||
da53d61e | 253 | schedule_delayed_work_on(smp_processor_id(), dw, delay); |
4447266b | 254 | mutex_unlock(&core_dbs_info->cdbs.timer_mutex); |
da53d61e FB |
255 | } |
256 | ||
4471a34f | 257 | /************************** sysfs interface ************************/ |
4d5dcc42 | 258 | static struct common_dbs_data od_dbs_cdata; |
1da177e4 | 259 | |
fd0ef7a0 MH |
260 | /** |
261 | * update_sampling_rate - update sampling rate effective immediately if needed. | |
262 | * @new_rate: new sampling rate | |
263 | * | |
06eb09d1 | 264 | * If new rate is smaller than the old, simply updating |
4471a34f VK |
265 | * dbs_tuners_int.sampling_rate might not be appropriate. For example, if the |
266 | * original sampling_rate was 1 second and the requested new sampling rate is 10 | |
267 | * ms because the user needs immediate reaction from ondemand governor, but not | |
268 | * sure if higher frequency will be required or not, then, the governor may | |
269 | * change the sampling rate too late; up to 1 second later. Thus, if we are | |
270 | * reducing the sampling rate, we need to make the new value effective | |
271 | * immediately. | |
fd0ef7a0 | 272 | */ |
4d5dcc42 VK |
273 | static void update_sampling_rate(struct dbs_data *dbs_data, |
274 | unsigned int new_rate) | |
fd0ef7a0 | 275 | { |
4d5dcc42 | 276 | struct od_dbs_tuners *od_tuners = dbs_data->tuners; |
fd0ef7a0 MH |
277 | int cpu; |
278 | ||
4d5dcc42 VK |
279 | od_tuners->sampling_rate = new_rate = max(new_rate, |
280 | dbs_data->min_sampling_rate); | |
fd0ef7a0 MH |
281 | |
282 | for_each_online_cpu(cpu) { | |
283 | struct cpufreq_policy *policy; | |
4471a34f | 284 | struct od_cpu_dbs_info_s *dbs_info; |
fd0ef7a0 MH |
285 | unsigned long next_sampling, appointed_at; |
286 | ||
287 | policy = cpufreq_cpu_get(cpu); | |
288 | if (!policy) | |
289 | continue; | |
3e33ee9e FB |
290 | if (policy->governor != &cpufreq_gov_ondemand) { |
291 | cpufreq_cpu_put(policy); | |
292 | continue; | |
293 | } | |
8ee2ec51 | 294 | dbs_info = &per_cpu(od_cpu_dbs_info, cpu); |
fd0ef7a0 MH |
295 | cpufreq_cpu_put(policy); |
296 | ||
4471a34f | 297 | mutex_lock(&dbs_info->cdbs.timer_mutex); |
fd0ef7a0 | 298 | |
4471a34f VK |
299 | if (!delayed_work_pending(&dbs_info->cdbs.work)) { |
300 | mutex_unlock(&dbs_info->cdbs.timer_mutex); | |
fd0ef7a0 MH |
301 | continue; |
302 | } | |
303 | ||
4471a34f VK |
304 | next_sampling = jiffies + usecs_to_jiffies(new_rate); |
305 | appointed_at = dbs_info->cdbs.work.timer.expires; | |
fd0ef7a0 MH |
306 | |
307 | if (time_before(next_sampling, appointed_at)) { | |
308 | ||
4471a34f VK |
309 | mutex_unlock(&dbs_info->cdbs.timer_mutex); |
310 | cancel_delayed_work_sync(&dbs_info->cdbs.work); | |
311 | mutex_lock(&dbs_info->cdbs.timer_mutex); | |
fd0ef7a0 | 312 | |
8ee2ec51 | 313 | schedule_delayed_work_on(cpu, &dbs_info->cdbs.work, |
4471a34f | 314 | usecs_to_jiffies(new_rate)); |
fd0ef7a0 MH |
315 | |
316 | } | |
4471a34f | 317 | mutex_unlock(&dbs_info->cdbs.timer_mutex); |
fd0ef7a0 MH |
318 | } |
319 | } | |
320 | ||
4d5dcc42 VK |
321 | static ssize_t store_sampling_rate(struct dbs_data *dbs_data, const char *buf, |
322 | size_t count) | |
1da177e4 LT |
323 | { |
324 | unsigned int input; | |
325 | int ret; | |
ffac80e9 | 326 | ret = sscanf(buf, "%u", &input); |
5a75c828 | 327 | if (ret != 1) |
328 | return -EINVAL; | |
4d5dcc42 VK |
329 | |
330 | update_sampling_rate(dbs_data, input); | |
1da177e4 LT |
331 | return count; |
332 | } | |
333 | ||
4d5dcc42 VK |
334 | static ssize_t store_io_is_busy(struct dbs_data *dbs_data, const char *buf, |
335 | size_t count) | |
19379b11 | 336 | { |
4d5dcc42 | 337 | struct od_dbs_tuners *od_tuners = dbs_data->tuners; |
19379b11 AV |
338 | unsigned int input; |
339 | int ret; | |
340 | ||
341 | ret = sscanf(buf, "%u", &input); | |
342 | if (ret != 1) | |
343 | return -EINVAL; | |
4d5dcc42 | 344 | od_tuners->io_is_busy = !!input; |
19379b11 AV |
345 | return count; |
346 | } | |
347 | ||
4d5dcc42 VK |
348 | static ssize_t store_up_threshold(struct dbs_data *dbs_data, const char *buf, |
349 | size_t count) | |
1da177e4 | 350 | { |
4d5dcc42 | 351 | struct od_dbs_tuners *od_tuners = dbs_data->tuners; |
1da177e4 LT |
352 | unsigned int input; |
353 | int ret; | |
ffac80e9 | 354 | ret = sscanf(buf, "%u", &input); |
1da177e4 | 355 | |
32ee8c3e | 356 | if (ret != 1 || input > MAX_FREQUENCY_UP_THRESHOLD || |
c29f1403 | 357 | input < MIN_FREQUENCY_UP_THRESHOLD) { |
1da177e4 LT |
358 | return -EINVAL; |
359 | } | |
4bd4e428 | 360 | /* Calculate the new adj_up_threshold */ |
4d5dcc42 VK |
361 | od_tuners->adj_up_threshold += input; |
362 | od_tuners->adj_up_threshold -= od_tuners->up_threshold; | |
4bd4e428 | 363 | |
4d5dcc42 | 364 | od_tuners->up_threshold = input; |
1da177e4 LT |
365 | return count; |
366 | } | |
367 | ||
4d5dcc42 VK |
368 | static ssize_t store_sampling_down_factor(struct dbs_data *dbs_data, |
369 | const char *buf, size_t count) | |
3f78a9f7 | 370 | { |
4d5dcc42 | 371 | struct od_dbs_tuners *od_tuners = dbs_data->tuners; |
3f78a9f7 DN |
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; | |
4d5dcc42 | 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 | ||
4d5dcc42 VK |
389 | static ssize_t store_ignore_nice(struct dbs_data *dbs_data, const char *buf, |
390 | size_t count) | |
3d5ee9e5 | 391 | { |
4d5dcc42 | 392 | struct od_dbs_tuners *od_tuners = dbs_data->tuners; |
3d5ee9e5 DJ |
393 | unsigned int input; |
394 | int ret; | |
395 | ||
396 | unsigned int j; | |
32ee8c3e | 397 | |
ffac80e9 | 398 | ret = sscanf(buf, "%u", &input); |
2b03f891 | 399 | if (ret != 1) |
3d5ee9e5 DJ |
400 | return -EINVAL; |
401 | ||
2b03f891 | 402 | if (input > 1) |
3d5ee9e5 | 403 | input = 1; |
32ee8c3e | 404 | |
4d5dcc42 | 405 | if (input == od_tuners->ignore_nice) { /* nothing to do */ |
3d5ee9e5 DJ |
406 | return count; |
407 | } | |
4d5dcc42 | 408 | od_tuners->ignore_nice = input; |
3d5ee9e5 | 409 | |
ccb2fe20 | 410 | /* we need to re-evaluate prev_cpu_idle */ |
dac1c1a5 | 411 | for_each_online_cpu(j) { |
4471a34f | 412 | struct od_cpu_dbs_info_s *dbs_info; |
245b2e70 | 413 | dbs_info = &per_cpu(od_cpu_dbs_info, j); |
4471a34f VK |
414 | dbs_info->cdbs.prev_cpu_idle = get_cpu_idle_time(j, |
415 | &dbs_info->cdbs.prev_cpu_wall); | |
4d5dcc42 | 416 | if (od_tuners->ignore_nice) |
4471a34f VK |
417 | dbs_info->cdbs.prev_cpu_nice = |
418 | kcpustat_cpu(j).cpustat[CPUTIME_NICE]; | |
1ca3abdb | 419 | |
3d5ee9e5 | 420 | } |
3d5ee9e5 DJ |
421 | return count; |
422 | } | |
423 | ||
4d5dcc42 VK |
424 | static ssize_t store_powersave_bias(struct dbs_data *dbs_data, const char *buf, |
425 | size_t count) | |
05ca0350 | 426 | { |
4d5dcc42 | 427 | struct od_dbs_tuners *od_tuners = dbs_data->tuners; |
05ca0350 AS |
428 | unsigned int input; |
429 | int ret; | |
430 | ret = sscanf(buf, "%u", &input); | |
431 | ||
432 | if (ret != 1) | |
433 | return -EINVAL; | |
434 | ||
435 | if (input > 1000) | |
436 | input = 1000; | |
437 | ||
4d5dcc42 | 438 | od_tuners->powersave_bias = input; |
05ca0350 | 439 | ondemand_powersave_bias_init(); |
05ca0350 AS |
440 | return count; |
441 | } | |
442 | ||
4d5dcc42 VK |
443 | show_store_one(od, sampling_rate); |
444 | show_store_one(od, io_is_busy); | |
445 | show_store_one(od, up_threshold); | |
446 | show_store_one(od, sampling_down_factor); | |
447 | show_store_one(od, ignore_nice); | |
448 | show_store_one(od, powersave_bias); | |
449 | declare_show_sampling_rate_min(od); | |
450 | ||
451 | gov_sys_pol_attr_rw(sampling_rate); | |
452 | gov_sys_pol_attr_rw(io_is_busy); | |
453 | gov_sys_pol_attr_rw(up_threshold); | |
454 | gov_sys_pol_attr_rw(sampling_down_factor); | |
455 | gov_sys_pol_attr_rw(ignore_nice); | |
456 | gov_sys_pol_attr_rw(powersave_bias); | |
457 | gov_sys_pol_attr_ro(sampling_rate_min); | |
458 | ||
459 | static struct attribute *dbs_attributes_gov_sys[] = { | |
460 | &sampling_rate_min_gov_sys.attr, | |
461 | &sampling_rate_gov_sys.attr, | |
462 | &up_threshold_gov_sys.attr, | |
463 | &sampling_down_factor_gov_sys.attr, | |
464 | &ignore_nice_gov_sys.attr, | |
465 | &powersave_bias_gov_sys.attr, | |
466 | &io_is_busy_gov_sys.attr, | |
1da177e4 LT |
467 | NULL |
468 | }; | |
469 | ||
4d5dcc42 VK |
470 | static struct attribute_group od_attr_group_gov_sys = { |
471 | .attrs = dbs_attributes_gov_sys, | |
472 | .name = "ondemand", | |
473 | }; | |
474 | ||
475 | static struct attribute *dbs_attributes_gov_pol[] = { | |
476 | &sampling_rate_min_gov_pol.attr, | |
477 | &sampling_rate_gov_pol.attr, | |
478 | &up_threshold_gov_pol.attr, | |
479 | &sampling_down_factor_gov_pol.attr, | |
480 | &ignore_nice_gov_pol.attr, | |
481 | &powersave_bias_gov_pol.attr, | |
482 | &io_is_busy_gov_pol.attr, | |
483 | NULL | |
484 | }; | |
485 | ||
486 | static struct attribute_group od_attr_group_gov_pol = { | |
487 | .attrs = dbs_attributes_gov_pol, | |
1da177e4 LT |
488 | .name = "ondemand", |
489 | }; | |
490 | ||
491 | /************************** sysfs end ************************/ | |
492 | ||
4d5dcc42 VK |
493 | static int od_init(struct dbs_data *dbs_data) |
494 | { | |
495 | struct od_dbs_tuners *tuners; | |
496 | u64 idle_time; | |
497 | int cpu; | |
498 | ||
499 | tuners = kzalloc(sizeof(struct od_dbs_tuners), GFP_KERNEL); | |
500 | if (!tuners) { | |
501 | pr_err("%s: kzalloc failed\n", __func__); | |
502 | return -ENOMEM; | |
503 | } | |
504 | ||
505 | cpu = get_cpu(); | |
506 | idle_time = get_cpu_idle_time_us(cpu, NULL); | |
507 | put_cpu(); | |
508 | if (idle_time != -1ULL) { | |
509 | /* Idle micro accounting is supported. Use finer thresholds */ | |
510 | tuners->up_threshold = MICRO_FREQUENCY_UP_THRESHOLD; | |
511 | tuners->adj_up_threshold = MICRO_FREQUENCY_UP_THRESHOLD - | |
512 | MICRO_FREQUENCY_DOWN_DIFFERENTIAL; | |
513 | /* | |
514 | * In nohz/micro accounting case we set the minimum frequency | |
515 | * not depending on HZ, but fixed (very low). The deferred | |
516 | * timer might skip some samples if idle/sleeping as needed. | |
517 | */ | |
518 | dbs_data->min_sampling_rate = MICRO_FREQUENCY_MIN_SAMPLE_RATE; | |
519 | } else { | |
520 | tuners->up_threshold = DEF_FREQUENCY_UP_THRESHOLD; | |
521 | tuners->adj_up_threshold = DEF_FREQUENCY_UP_THRESHOLD - | |
522 | DEF_FREQUENCY_DOWN_DIFFERENTIAL; | |
523 | ||
524 | /* For correct statistics, we need 10 ticks for each measure */ | |
525 | dbs_data->min_sampling_rate = MIN_SAMPLING_RATE_RATIO * | |
526 | jiffies_to_usecs(10); | |
527 | } | |
528 | ||
529 | tuners->sampling_down_factor = DEF_SAMPLING_DOWN_FACTOR; | |
530 | tuners->ignore_nice = 0; | |
531 | tuners->powersave_bias = 0; | |
532 | tuners->io_is_busy = should_io_be_busy(); | |
533 | ||
534 | dbs_data->tuners = tuners; | |
535 | pr_info("%s: tuners %p\n", __func__, tuners); | |
536 | mutex_init(&dbs_data->mutex); | |
537 | return 0; | |
538 | } | |
539 | ||
540 | static void od_exit(struct dbs_data *dbs_data) | |
541 | { | |
542 | kfree(dbs_data->tuners); | |
543 | } | |
544 | ||
4471a34f | 545 | define_get_cpu_dbs_routines(od_cpu_dbs_info); |
6b8fcd90 | 546 | |
4471a34f | 547 | static struct od_ops od_ops = { |
4471a34f VK |
548 | .powersave_bias_init_cpu = ondemand_powersave_bias_init_cpu, |
549 | .powersave_bias_target = powersave_bias_target, | |
550 | .freq_increase = dbs_freq_increase, | |
551 | }; | |
2f8a835c | 552 | |
4d5dcc42 | 553 | static struct common_dbs_data od_dbs_cdata = { |
4471a34f | 554 | .governor = GOV_ONDEMAND, |
4d5dcc42 VK |
555 | .attr_group_gov_sys = &od_attr_group_gov_sys, |
556 | .attr_group_gov_pol = &od_attr_group_gov_pol, | |
4471a34f VK |
557 | .get_cpu_cdbs = get_cpu_cdbs, |
558 | .get_cpu_dbs_info_s = get_cpu_dbs_info_s, | |
559 | .gov_dbs_timer = od_dbs_timer, | |
560 | .gov_check_cpu = od_check_cpu, | |
561 | .gov_ops = &od_ops, | |
4d5dcc42 VK |
562 | .init = od_init, |
563 | .exit = od_exit, | |
4471a34f | 564 | }; |
1da177e4 | 565 | |
4471a34f VK |
566 | static int od_cpufreq_governor_dbs(struct cpufreq_policy *policy, |
567 | unsigned int event) | |
1da177e4 | 568 | { |
4d5dcc42 | 569 | return cpufreq_governor_dbs(policy, &od_dbs_cdata, event); |
1da177e4 LT |
570 | } |
571 | ||
4471a34f VK |
572 | #ifndef CONFIG_CPU_FREQ_DEFAULT_GOV_ONDEMAND |
573 | static | |
19379b11 | 574 | #endif |
4471a34f VK |
575 | struct cpufreq_governor cpufreq_gov_ondemand = { |
576 | .name = "ondemand", | |
577 | .governor = od_cpufreq_governor_dbs, | |
578 | .max_transition_latency = TRANSITION_LATENCY_LIMIT, | |
579 | .owner = THIS_MODULE, | |
580 | }; | |
1da177e4 | 581 | |
1da177e4 LT |
582 | static int __init cpufreq_gov_dbs_init(void) |
583 | { | |
57df5573 | 584 | return cpufreq_register_governor(&cpufreq_gov_ondemand); |
1da177e4 LT |
585 | } |
586 | ||
587 | static void __exit cpufreq_gov_dbs_exit(void) | |
588 | { | |
1c256245 | 589 | cpufreq_unregister_governor(&cpufreq_gov_ondemand); |
1da177e4 LT |
590 | } |
591 | ||
ffac80e9 VP |
592 | MODULE_AUTHOR("Venkatesh Pallipadi <venkatesh.pallipadi@intel.com>"); |
593 | MODULE_AUTHOR("Alexey Starikovskiy <alexey.y.starikovskiy@intel.com>"); | |
594 | MODULE_DESCRIPTION("'cpufreq_ondemand' - A dynamic cpufreq governor for " | |
2b03f891 | 595 | "Low Latency Frequency Transition capable processors"); |
ffac80e9 | 596 | MODULE_LICENSE("GPL"); |
1da177e4 | 597 | |
6915719b JW |
598 | #ifdef CONFIG_CPU_FREQ_DEFAULT_GOV_ONDEMAND |
599 | fs_initcall(cpufreq_gov_dbs_init); | |
600 | #else | |
1da177e4 | 601 | module_init(cpufreq_gov_dbs_init); |
6915719b | 602 | #endif |
1da177e4 | 603 | module_exit(cpufreq_gov_dbs_exit); |