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> |
fb30809e | 27 | #include <linux/cpu.h> |
1da177e4 | 28 | |
4471a34f | 29 | #include "cpufreq_governor.h" |
1da177e4 | 30 | |
06eb09d1 | 31 | /* On-demand governor macros */ |
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_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 | 40 | static DEFINE_PER_CPU(struct od_cpu_dbs_info_s, od_cpu_dbs_info); |
1da177e4 | 41 | |
fb30809e JS |
42 | static struct od_ops od_ops; |
43 | ||
3e33ee9e FB |
44 | #ifndef CONFIG_CPU_FREQ_DEFAULT_GOV_ONDEMAND |
45 | static struct cpufreq_governor cpufreq_gov_ondemand; | |
46 | #endif | |
47 | ||
c2837558 JS |
48 | static unsigned int default_powersave_bias; |
49 | ||
4471a34f | 50 | static void ondemand_powersave_bias_init_cpu(int cpu) |
6b8fcd90 | 51 | { |
4471a34f | 52 | struct od_cpu_dbs_info_s *dbs_info = &per_cpu(od_cpu_dbs_info, cpu); |
6b8fcd90 | 53 | |
4471a34f VK |
54 | dbs_info->freq_table = cpufreq_frequency_get_table(cpu); |
55 | dbs_info->freq_lo = 0; | |
56 | } | |
6b8fcd90 | 57 | |
4471a34f VK |
58 | /* |
59 | * Not all CPUs want IO time to be accounted as busy; this depends on how | |
60 | * efficient idling at a higher frequency/voltage is. | |
61 | * Pavel Machek says this is not so for various generations of AMD and old | |
62 | * Intel systems. | |
06eb09d1 | 63 | * Mike Chan (android.com) claims this is also not true for ARM. |
4471a34f VK |
64 | * Because of this, whitelist specific known (series) of CPUs by default, and |
65 | * leave all others up to the user. | |
66 | */ | |
67 | static int should_io_be_busy(void) | |
68 | { | |
69 | #if defined(CONFIG_X86) | |
70 | /* | |
06eb09d1 | 71 | * For Intel, Core 2 (model 15) and later have an efficient idle. |
4471a34f VK |
72 | */ |
73 | if (boot_cpu_data.x86_vendor == X86_VENDOR_INTEL && | |
74 | boot_cpu_data.x86 == 6 && | |
75 | boot_cpu_data.x86_model >= 15) | |
76 | return 1; | |
77 | #endif | |
78 | return 0; | |
6b8fcd90 AV |
79 | } |
80 | ||
05ca0350 AS |
81 | /* |
82 | * Find right freq to be set now with powersave_bias on. | |
83 | * Returns the freq_hi to be used right now and will set freq_hi_jiffies, | |
84 | * freq_lo, and freq_lo_jiffies in percpu area for averaging freqs. | |
85 | */ | |
fb30809e | 86 | static unsigned int generic_powersave_bias_target(struct cpufreq_policy *policy, |
4471a34f | 87 | unsigned int freq_next, unsigned int relation) |
05ca0350 AS |
88 | { |
89 | unsigned int freq_req, freq_reduc, freq_avg; | |
90 | unsigned int freq_hi, freq_lo; | |
91 | unsigned int index = 0; | |
92 | unsigned int jiffies_total, jiffies_hi, jiffies_lo; | |
4471a34f | 93 | struct od_cpu_dbs_info_s *dbs_info = &per_cpu(od_cpu_dbs_info, |
245b2e70 | 94 | policy->cpu); |
4d5dcc42 VK |
95 | struct dbs_data *dbs_data = policy->governor_data; |
96 | struct od_dbs_tuners *od_tuners = dbs_data->tuners; | |
05ca0350 AS |
97 | |
98 | if (!dbs_info->freq_table) { | |
99 | dbs_info->freq_lo = 0; | |
100 | dbs_info->freq_lo_jiffies = 0; | |
101 | return freq_next; | |
102 | } | |
103 | ||
104 | cpufreq_frequency_table_target(policy, dbs_info->freq_table, freq_next, | |
105 | relation, &index); | |
106 | freq_req = dbs_info->freq_table[index].frequency; | |
4d5dcc42 | 107 | freq_reduc = freq_req * od_tuners->powersave_bias / 1000; |
05ca0350 AS |
108 | freq_avg = freq_req - freq_reduc; |
109 | ||
110 | /* Find freq bounds for freq_avg in freq_table */ | |
111 | index = 0; | |
112 | cpufreq_frequency_table_target(policy, dbs_info->freq_table, freq_avg, | |
113 | CPUFREQ_RELATION_H, &index); | |
114 | freq_lo = dbs_info->freq_table[index].frequency; | |
115 | index = 0; | |
116 | cpufreq_frequency_table_target(policy, dbs_info->freq_table, freq_avg, | |
117 | CPUFREQ_RELATION_L, &index); | |
118 | freq_hi = dbs_info->freq_table[index].frequency; | |
119 | ||
120 | /* Find out how long we have to be in hi and lo freqs */ | |
121 | if (freq_hi == freq_lo) { | |
122 | dbs_info->freq_lo = 0; | |
123 | dbs_info->freq_lo_jiffies = 0; | |
124 | return freq_lo; | |
125 | } | |
4d5dcc42 | 126 | jiffies_total = usecs_to_jiffies(od_tuners->sampling_rate); |
05ca0350 AS |
127 | jiffies_hi = (freq_avg - freq_lo) * jiffies_total; |
128 | jiffies_hi += ((freq_hi - freq_lo) / 2); | |
129 | jiffies_hi /= (freq_hi - freq_lo); | |
130 | jiffies_lo = jiffies_total - jiffies_hi; | |
131 | dbs_info->freq_lo = freq_lo; | |
132 | dbs_info->freq_lo_jiffies = jiffies_lo; | |
133 | dbs_info->freq_hi_jiffies = jiffies_hi; | |
134 | return freq_hi; | |
135 | } | |
136 | ||
137 | static void ondemand_powersave_bias_init(void) | |
138 | { | |
139 | int i; | |
140 | for_each_online_cpu(i) { | |
5a75c828 | 141 | ondemand_powersave_bias_init_cpu(i); |
05ca0350 AS |
142 | } |
143 | } | |
144 | ||
4471a34f VK |
145 | static void dbs_freq_increase(struct cpufreq_policy *p, unsigned int freq) |
146 | { | |
4d5dcc42 VK |
147 | struct dbs_data *dbs_data = p->governor_data; |
148 | struct od_dbs_tuners *od_tuners = dbs_data->tuners; | |
149 | ||
150 | if (od_tuners->powersave_bias) | |
fb30809e JS |
151 | freq = od_ops.powersave_bias_target(p, freq, |
152 | CPUFREQ_RELATION_H); | |
4471a34f VK |
153 | else if (p->cur == p->max) |
154 | return; | |
0e625ac1 | 155 | |
4d5dcc42 | 156 | __cpufreq_driver_target(p, freq, od_tuners->powersave_bias ? |
4471a34f VK |
157 | CPUFREQ_RELATION_L : CPUFREQ_RELATION_H); |
158 | } | |
159 | ||
160 | /* | |
161 | * Every sampling_rate, we check, if current idle time is less than 20% | |
bed53965 SK |
162 | * (default), then we try to increase frequency. Else, we adjust the frequency |
163 | * proportional to load. | |
4471a34f | 164 | */ |
bed53965 | 165 | static void od_check_cpu(int cpu, unsigned int load) |
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 */ | |
bed53965 | 175 | if (load > od_tuners->up_threshold) { |
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; | |
bed53965 SK |
182 | } else { |
183 | /* Calculate the next frequency proportional to load */ | |
4471a34f | 184 | unsigned int freq_next; |
bed53965 | 185 | freq_next = load * policy->cpuinfo.max_freq / 100; |
4471a34f VK |
186 | |
187 | /* No longer fully busy, reset rate_mult */ | |
188 | dbs_info->rate_mult = 1; | |
189 | ||
190 | if (freq_next < policy->min) | |
191 | freq_next = policy->min; | |
192 | ||
4d5dcc42 | 193 | if (!od_tuners->powersave_bias) { |
4471a34f VK |
194 | __cpufreq_driver_target(policy, freq_next, |
195 | CPUFREQ_RELATION_L); | |
fb30809e | 196 | return; |
4471a34f | 197 | } |
fb30809e JS |
198 | |
199 | freq_next = od_ops.powersave_bias_target(policy, freq_next, | |
200 | CPUFREQ_RELATION_L); | |
201 | __cpufreq_driver_target(policy, freq_next, CPUFREQ_RELATION_L); | |
4471a34f | 202 | } |
1da177e4 LT |
203 | } |
204 | ||
4447266b | 205 | static void od_dbs_timer(struct work_struct *work) |
4471a34f | 206 | { |
4447266b VK |
207 | struct od_cpu_dbs_info_s *dbs_info = |
208 | container_of(work, struct od_cpu_dbs_info_s, cdbs.work.work); | |
09dca5ae | 209 | unsigned int cpu = dbs_info->cdbs.cur_policy->cpu; |
4447266b VK |
210 | struct od_cpu_dbs_info_s *core_dbs_info = &per_cpu(od_cpu_dbs_info, |
211 | cpu); | |
4d5dcc42 VK |
212 | struct dbs_data *dbs_data = dbs_info->cdbs.cur_policy->governor_data; |
213 | struct od_dbs_tuners *od_tuners = dbs_data->tuners; | |
9d445920 | 214 | int delay = 0, sample_type = core_dbs_info->sample_type; |
031299b3 | 215 | bool modify_all = true; |
4447266b VK |
216 | |
217 | mutex_lock(&core_dbs_info->cdbs.timer_mutex); | |
031299b3 VK |
218 | if (!need_load_eval(&core_dbs_info->cdbs, od_tuners->sampling_rate)) { |
219 | modify_all = false; | |
9d445920 | 220 | goto max_delay; |
031299b3 | 221 | } |
1da177e4 | 222 | |
4471a34f | 223 | /* Common NORMAL_SAMPLE setup */ |
4447266b | 224 | core_dbs_info->sample_type = OD_NORMAL_SAMPLE; |
4471a34f | 225 | if (sample_type == OD_SUB_SAMPLE) { |
4447266b | 226 | delay = core_dbs_info->freq_lo_jiffies; |
9d445920 VK |
227 | __cpufreq_driver_target(core_dbs_info->cdbs.cur_policy, |
228 | core_dbs_info->freq_lo, CPUFREQ_RELATION_H); | |
4471a34f | 229 | } else { |
9d445920 | 230 | dbs_check_cpu(dbs_data, cpu); |
4447266b | 231 | if (core_dbs_info->freq_lo) { |
4471a34f | 232 | /* Setup timer for SUB_SAMPLE */ |
4447266b VK |
233 | core_dbs_info->sample_type = OD_SUB_SAMPLE; |
234 | delay = core_dbs_info->freq_hi_jiffies; | |
4471a34f VK |
235 | } |
236 | } | |
237 | ||
9d445920 VK |
238 | max_delay: |
239 | if (!delay) | |
240 | delay = delay_for_sampling_rate(od_tuners->sampling_rate | |
241 | * core_dbs_info->rate_mult); | |
242 | ||
031299b3 | 243 | gov_queue_work(dbs_data, dbs_info->cdbs.cur_policy, delay, modify_all); |
4447266b | 244 | mutex_unlock(&core_dbs_info->cdbs.timer_mutex); |
da53d61e FB |
245 | } |
246 | ||
4471a34f | 247 | /************************** sysfs interface ************************/ |
4d5dcc42 | 248 | static struct common_dbs_data od_dbs_cdata; |
1da177e4 | 249 | |
fd0ef7a0 MH |
250 | /** |
251 | * update_sampling_rate - update sampling rate effective immediately if needed. | |
252 | * @new_rate: new sampling rate | |
253 | * | |
06eb09d1 | 254 | * If new rate is smaller than the old, simply updating |
4471a34f VK |
255 | * dbs_tuners_int.sampling_rate might not be appropriate. For example, if the |
256 | * original sampling_rate was 1 second and the requested new sampling rate is 10 | |
257 | * ms because the user needs immediate reaction from ondemand governor, but not | |
258 | * sure if higher frequency will be required or not, then, the governor may | |
259 | * change the sampling rate too late; up to 1 second later. Thus, if we are | |
260 | * reducing the sampling rate, we need to make the new value effective | |
261 | * immediately. | |
fd0ef7a0 | 262 | */ |
4d5dcc42 VK |
263 | static void update_sampling_rate(struct dbs_data *dbs_data, |
264 | unsigned int new_rate) | |
fd0ef7a0 | 265 | { |
4d5dcc42 | 266 | struct od_dbs_tuners *od_tuners = dbs_data->tuners; |
fd0ef7a0 MH |
267 | int cpu; |
268 | ||
4d5dcc42 VK |
269 | od_tuners->sampling_rate = new_rate = max(new_rate, |
270 | dbs_data->min_sampling_rate); | |
fd0ef7a0 MH |
271 | |
272 | for_each_online_cpu(cpu) { | |
273 | struct cpufreq_policy *policy; | |
4471a34f | 274 | struct od_cpu_dbs_info_s *dbs_info; |
fd0ef7a0 MH |
275 | unsigned long next_sampling, appointed_at; |
276 | ||
277 | policy = cpufreq_cpu_get(cpu); | |
278 | if (!policy) | |
279 | continue; | |
3e33ee9e FB |
280 | if (policy->governor != &cpufreq_gov_ondemand) { |
281 | cpufreq_cpu_put(policy); | |
282 | continue; | |
283 | } | |
8ee2ec51 | 284 | dbs_info = &per_cpu(od_cpu_dbs_info, cpu); |
fd0ef7a0 MH |
285 | cpufreq_cpu_put(policy); |
286 | ||
4471a34f | 287 | mutex_lock(&dbs_info->cdbs.timer_mutex); |
fd0ef7a0 | 288 | |
4471a34f VK |
289 | if (!delayed_work_pending(&dbs_info->cdbs.work)) { |
290 | mutex_unlock(&dbs_info->cdbs.timer_mutex); | |
fd0ef7a0 MH |
291 | continue; |
292 | } | |
293 | ||
4471a34f VK |
294 | next_sampling = jiffies + usecs_to_jiffies(new_rate); |
295 | appointed_at = dbs_info->cdbs.work.timer.expires; | |
fd0ef7a0 MH |
296 | |
297 | if (time_before(next_sampling, appointed_at)) { | |
298 | ||
4471a34f VK |
299 | mutex_unlock(&dbs_info->cdbs.timer_mutex); |
300 | cancel_delayed_work_sync(&dbs_info->cdbs.work); | |
301 | mutex_lock(&dbs_info->cdbs.timer_mutex); | |
fd0ef7a0 | 302 | |
031299b3 VK |
303 | gov_queue_work(dbs_data, dbs_info->cdbs.cur_policy, |
304 | usecs_to_jiffies(new_rate), true); | |
fd0ef7a0 MH |
305 | |
306 | } | |
4471a34f | 307 | mutex_unlock(&dbs_info->cdbs.timer_mutex); |
fd0ef7a0 MH |
308 | } |
309 | } | |
310 | ||
4d5dcc42 VK |
311 | static ssize_t store_sampling_rate(struct dbs_data *dbs_data, const char *buf, |
312 | size_t count) | |
1da177e4 LT |
313 | { |
314 | unsigned int input; | |
315 | int ret; | |
ffac80e9 | 316 | ret = sscanf(buf, "%u", &input); |
5a75c828 | 317 | if (ret != 1) |
318 | return -EINVAL; | |
4d5dcc42 VK |
319 | |
320 | update_sampling_rate(dbs_data, input); | |
1da177e4 LT |
321 | return count; |
322 | } | |
323 | ||
4d5dcc42 VK |
324 | static ssize_t store_io_is_busy(struct dbs_data *dbs_data, const char *buf, |
325 | size_t count) | |
19379b11 | 326 | { |
4d5dcc42 | 327 | struct od_dbs_tuners *od_tuners = dbs_data->tuners; |
19379b11 AV |
328 | unsigned int input; |
329 | int ret; | |
9366d840 | 330 | unsigned int j; |
19379b11 AV |
331 | |
332 | ret = sscanf(buf, "%u", &input); | |
333 | if (ret != 1) | |
334 | return -EINVAL; | |
4d5dcc42 | 335 | od_tuners->io_is_busy = !!input; |
9366d840 SK |
336 | |
337 | /* we need to re-evaluate prev_cpu_idle */ | |
338 | for_each_online_cpu(j) { | |
339 | struct od_cpu_dbs_info_s *dbs_info = &per_cpu(od_cpu_dbs_info, | |
340 | j); | |
341 | dbs_info->cdbs.prev_cpu_idle = get_cpu_idle_time(j, | |
342 | &dbs_info->cdbs.prev_cpu_wall, od_tuners->io_is_busy); | |
343 | } | |
19379b11 AV |
344 | return count; |
345 | } | |
346 | ||
4d5dcc42 VK |
347 | static ssize_t store_up_threshold(struct dbs_data *dbs_data, const char *buf, |
348 | size_t count) | |
1da177e4 | 349 | { |
4d5dcc42 | 350 | struct od_dbs_tuners *od_tuners = dbs_data->tuners; |
1da177e4 LT |
351 | unsigned int input; |
352 | int ret; | |
ffac80e9 | 353 | ret = sscanf(buf, "%u", &input); |
1da177e4 | 354 | |
32ee8c3e | 355 | if (ret != 1 || input > MAX_FREQUENCY_UP_THRESHOLD || |
c29f1403 | 356 | input < MIN_FREQUENCY_UP_THRESHOLD) { |
1da177e4 LT |
357 | return -EINVAL; |
358 | } | |
4bd4e428 | 359 | |
4d5dcc42 | 360 | od_tuners->up_threshold = input; |
1da177e4 LT |
361 | return count; |
362 | } | |
363 | ||
4d5dcc42 VK |
364 | static ssize_t store_sampling_down_factor(struct dbs_data *dbs_data, |
365 | const char *buf, size_t count) | |
3f78a9f7 | 366 | { |
4d5dcc42 | 367 | struct od_dbs_tuners *od_tuners = dbs_data->tuners; |
3f78a9f7 DN |
368 | unsigned int input, j; |
369 | int ret; | |
370 | ret = sscanf(buf, "%u", &input); | |
371 | ||
372 | if (ret != 1 || input > MAX_SAMPLING_DOWN_FACTOR || input < 1) | |
373 | return -EINVAL; | |
4d5dcc42 | 374 | od_tuners->sampling_down_factor = input; |
3f78a9f7 DN |
375 | |
376 | /* Reset down sampling multiplier in case it was active */ | |
377 | for_each_online_cpu(j) { | |
4471a34f VK |
378 | struct od_cpu_dbs_info_s *dbs_info = &per_cpu(od_cpu_dbs_info, |
379 | j); | |
3f78a9f7 DN |
380 | dbs_info->rate_mult = 1; |
381 | } | |
3f78a9f7 DN |
382 | return count; |
383 | } | |
384 | ||
da712f3a VK |
385 | static ssize_t store_ignore_nice_load(struct dbs_data *dbs_data, |
386 | const char *buf, size_t count) | |
3d5ee9e5 | 387 | { |
4d5dcc42 | 388 | struct od_dbs_tuners *od_tuners = dbs_data->tuners; |
3d5ee9e5 DJ |
389 | unsigned int input; |
390 | int ret; | |
391 | ||
392 | unsigned int j; | |
32ee8c3e | 393 | |
ffac80e9 | 394 | ret = sscanf(buf, "%u", &input); |
2b03f891 | 395 | if (ret != 1) |
3d5ee9e5 DJ |
396 | return -EINVAL; |
397 | ||
2b03f891 | 398 | if (input > 1) |
3d5ee9e5 | 399 | input = 1; |
32ee8c3e | 400 | |
da712f3a | 401 | if (input == od_tuners->ignore_nice_load) { /* nothing to do */ |
3d5ee9e5 DJ |
402 | return count; |
403 | } | |
da712f3a | 404 | od_tuners->ignore_nice_load = input; |
3d5ee9e5 | 405 | |
ccb2fe20 | 406 | /* we need to re-evaluate prev_cpu_idle */ |
dac1c1a5 | 407 | for_each_online_cpu(j) { |
4471a34f | 408 | struct od_cpu_dbs_info_s *dbs_info; |
245b2e70 | 409 | dbs_info = &per_cpu(od_cpu_dbs_info, j); |
4471a34f | 410 | dbs_info->cdbs.prev_cpu_idle = get_cpu_idle_time(j, |
9366d840 | 411 | &dbs_info->cdbs.prev_cpu_wall, od_tuners->io_is_busy); |
da712f3a | 412 | if (od_tuners->ignore_nice_load) |
4471a34f VK |
413 | dbs_info->cdbs.prev_cpu_nice = |
414 | kcpustat_cpu(j).cpustat[CPUTIME_NICE]; | |
1ca3abdb | 415 | |
3d5ee9e5 | 416 | } |
3d5ee9e5 DJ |
417 | return count; |
418 | } | |
419 | ||
4d5dcc42 VK |
420 | static ssize_t store_powersave_bias(struct dbs_data *dbs_data, const char *buf, |
421 | size_t count) | |
05ca0350 | 422 | { |
4d5dcc42 | 423 | struct od_dbs_tuners *od_tuners = dbs_data->tuners; |
05ca0350 AS |
424 | unsigned int input; |
425 | int ret; | |
426 | ret = sscanf(buf, "%u", &input); | |
427 | ||
428 | if (ret != 1) | |
429 | return -EINVAL; | |
430 | ||
431 | if (input > 1000) | |
432 | input = 1000; | |
433 | ||
4d5dcc42 | 434 | od_tuners->powersave_bias = input; |
05ca0350 | 435 | ondemand_powersave_bias_init(); |
05ca0350 AS |
436 | return count; |
437 | } | |
438 | ||
4d5dcc42 VK |
439 | show_store_one(od, sampling_rate); |
440 | show_store_one(od, io_is_busy); | |
441 | show_store_one(od, up_threshold); | |
442 | show_store_one(od, sampling_down_factor); | |
da712f3a | 443 | show_store_one(od, ignore_nice_load); |
4d5dcc42 VK |
444 | show_store_one(od, powersave_bias); |
445 | declare_show_sampling_rate_min(od); | |
446 | ||
447 | gov_sys_pol_attr_rw(sampling_rate); | |
448 | gov_sys_pol_attr_rw(io_is_busy); | |
449 | gov_sys_pol_attr_rw(up_threshold); | |
450 | gov_sys_pol_attr_rw(sampling_down_factor); | |
da712f3a | 451 | gov_sys_pol_attr_rw(ignore_nice_load); |
4d5dcc42 VK |
452 | gov_sys_pol_attr_rw(powersave_bias); |
453 | gov_sys_pol_attr_ro(sampling_rate_min); | |
454 | ||
455 | static struct attribute *dbs_attributes_gov_sys[] = { | |
456 | &sampling_rate_min_gov_sys.attr, | |
457 | &sampling_rate_gov_sys.attr, | |
458 | &up_threshold_gov_sys.attr, | |
459 | &sampling_down_factor_gov_sys.attr, | |
da712f3a | 460 | &ignore_nice_load_gov_sys.attr, |
4d5dcc42 VK |
461 | &powersave_bias_gov_sys.attr, |
462 | &io_is_busy_gov_sys.attr, | |
1da177e4 LT |
463 | NULL |
464 | }; | |
465 | ||
4d5dcc42 VK |
466 | static struct attribute_group od_attr_group_gov_sys = { |
467 | .attrs = dbs_attributes_gov_sys, | |
468 | .name = "ondemand", | |
469 | }; | |
470 | ||
471 | static struct attribute *dbs_attributes_gov_pol[] = { | |
472 | &sampling_rate_min_gov_pol.attr, | |
473 | &sampling_rate_gov_pol.attr, | |
474 | &up_threshold_gov_pol.attr, | |
475 | &sampling_down_factor_gov_pol.attr, | |
da712f3a | 476 | &ignore_nice_load_gov_pol.attr, |
4d5dcc42 VK |
477 | &powersave_bias_gov_pol.attr, |
478 | &io_is_busy_gov_pol.attr, | |
479 | NULL | |
480 | }; | |
481 | ||
482 | static struct attribute_group od_attr_group_gov_pol = { | |
483 | .attrs = dbs_attributes_gov_pol, | |
1da177e4 LT |
484 | .name = "ondemand", |
485 | }; | |
486 | ||
487 | /************************** sysfs end ************************/ | |
488 | ||
4d5dcc42 VK |
489 | static int od_init(struct dbs_data *dbs_data) |
490 | { | |
491 | struct od_dbs_tuners *tuners; | |
492 | u64 idle_time; | |
493 | int cpu; | |
494 | ||
495 | tuners = kzalloc(sizeof(struct od_dbs_tuners), GFP_KERNEL); | |
496 | if (!tuners) { | |
497 | pr_err("%s: kzalloc failed\n", __func__); | |
498 | return -ENOMEM; | |
499 | } | |
500 | ||
501 | cpu = get_cpu(); | |
502 | idle_time = get_cpu_idle_time_us(cpu, NULL); | |
503 | put_cpu(); | |
504 | if (idle_time != -1ULL) { | |
505 | /* Idle micro accounting is supported. Use finer thresholds */ | |
506 | tuners->up_threshold = MICRO_FREQUENCY_UP_THRESHOLD; | |
4d5dcc42 VK |
507 | /* |
508 | * In nohz/micro accounting case we set the minimum frequency | |
509 | * not depending on HZ, but fixed (very low). The deferred | |
510 | * timer might skip some samples if idle/sleeping as needed. | |
511 | */ | |
512 | dbs_data->min_sampling_rate = MICRO_FREQUENCY_MIN_SAMPLE_RATE; | |
513 | } else { | |
514 | tuners->up_threshold = DEF_FREQUENCY_UP_THRESHOLD; | |
4d5dcc42 VK |
515 | |
516 | /* For correct statistics, we need 10 ticks for each measure */ | |
517 | dbs_data->min_sampling_rate = MIN_SAMPLING_RATE_RATIO * | |
518 | jiffies_to_usecs(10); | |
519 | } | |
520 | ||
521 | tuners->sampling_down_factor = DEF_SAMPLING_DOWN_FACTOR; | |
da712f3a | 522 | tuners->ignore_nice_load = 0; |
c2837558 | 523 | tuners->powersave_bias = default_powersave_bias; |
4d5dcc42 VK |
524 | tuners->io_is_busy = should_io_be_busy(); |
525 | ||
526 | dbs_data->tuners = tuners; | |
4d5dcc42 VK |
527 | mutex_init(&dbs_data->mutex); |
528 | return 0; | |
529 | } | |
530 | ||
531 | static void od_exit(struct dbs_data *dbs_data) | |
532 | { | |
533 | kfree(dbs_data->tuners); | |
534 | } | |
535 | ||
4471a34f | 536 | define_get_cpu_dbs_routines(od_cpu_dbs_info); |
6b8fcd90 | 537 | |
4471a34f | 538 | static struct od_ops od_ops = { |
4471a34f | 539 | .powersave_bias_init_cpu = ondemand_powersave_bias_init_cpu, |
fb30809e | 540 | .powersave_bias_target = generic_powersave_bias_target, |
4471a34f VK |
541 | .freq_increase = dbs_freq_increase, |
542 | }; | |
2f8a835c | 543 | |
4d5dcc42 | 544 | static struct common_dbs_data od_dbs_cdata = { |
4471a34f | 545 | .governor = GOV_ONDEMAND, |
4d5dcc42 VK |
546 | .attr_group_gov_sys = &od_attr_group_gov_sys, |
547 | .attr_group_gov_pol = &od_attr_group_gov_pol, | |
4471a34f VK |
548 | .get_cpu_cdbs = get_cpu_cdbs, |
549 | .get_cpu_dbs_info_s = get_cpu_dbs_info_s, | |
550 | .gov_dbs_timer = od_dbs_timer, | |
551 | .gov_check_cpu = od_check_cpu, | |
552 | .gov_ops = &od_ops, | |
4d5dcc42 VK |
553 | .init = od_init, |
554 | .exit = od_exit, | |
4471a34f | 555 | }; |
1da177e4 | 556 | |
fb30809e JS |
557 | static void od_set_powersave_bias(unsigned int powersave_bias) |
558 | { | |
559 | struct cpufreq_policy *policy; | |
560 | struct dbs_data *dbs_data; | |
561 | struct od_dbs_tuners *od_tuners; | |
562 | unsigned int cpu; | |
563 | cpumask_t done; | |
564 | ||
c2837558 | 565 | default_powersave_bias = powersave_bias; |
fb30809e JS |
566 | cpumask_clear(&done); |
567 | ||
568 | get_online_cpus(); | |
569 | for_each_online_cpu(cpu) { | |
570 | if (cpumask_test_cpu(cpu, &done)) | |
571 | continue; | |
572 | ||
573 | policy = per_cpu(od_cpu_dbs_info, cpu).cdbs.cur_policy; | |
c2837558 JS |
574 | if (!policy) |
575 | continue; | |
fb30809e JS |
576 | |
577 | cpumask_or(&done, &done, policy->cpus); | |
c2837558 JS |
578 | |
579 | if (policy->governor != &cpufreq_gov_ondemand) | |
580 | continue; | |
581 | ||
582 | dbs_data = policy->governor_data; | |
583 | od_tuners = dbs_data->tuners; | |
584 | od_tuners->powersave_bias = default_powersave_bias; | |
fb30809e JS |
585 | } |
586 | put_online_cpus(); | |
587 | } | |
588 | ||
589 | void od_register_powersave_bias_handler(unsigned int (*f) | |
590 | (struct cpufreq_policy *, unsigned int, unsigned int), | |
591 | unsigned int powersave_bias) | |
592 | { | |
593 | od_ops.powersave_bias_target = f; | |
594 | od_set_powersave_bias(powersave_bias); | |
595 | } | |
596 | EXPORT_SYMBOL_GPL(od_register_powersave_bias_handler); | |
597 | ||
598 | void od_unregister_powersave_bias_handler(void) | |
599 | { | |
600 | od_ops.powersave_bias_target = generic_powersave_bias_target; | |
601 | od_set_powersave_bias(0); | |
602 | } | |
603 | EXPORT_SYMBOL_GPL(od_unregister_powersave_bias_handler); | |
604 | ||
4471a34f VK |
605 | static int od_cpufreq_governor_dbs(struct cpufreq_policy *policy, |
606 | unsigned int event) | |
1da177e4 | 607 | { |
4d5dcc42 | 608 | return cpufreq_governor_dbs(policy, &od_dbs_cdata, event); |
1da177e4 LT |
609 | } |
610 | ||
4471a34f VK |
611 | #ifndef CONFIG_CPU_FREQ_DEFAULT_GOV_ONDEMAND |
612 | static | |
19379b11 | 613 | #endif |
4471a34f VK |
614 | struct cpufreq_governor cpufreq_gov_ondemand = { |
615 | .name = "ondemand", | |
616 | .governor = od_cpufreq_governor_dbs, | |
617 | .max_transition_latency = TRANSITION_LATENCY_LIMIT, | |
618 | .owner = THIS_MODULE, | |
619 | }; | |
1da177e4 | 620 | |
1da177e4 LT |
621 | static int __init cpufreq_gov_dbs_init(void) |
622 | { | |
57df5573 | 623 | return cpufreq_register_governor(&cpufreq_gov_ondemand); |
1da177e4 LT |
624 | } |
625 | ||
626 | static void __exit cpufreq_gov_dbs_exit(void) | |
627 | { | |
1c256245 | 628 | cpufreq_unregister_governor(&cpufreq_gov_ondemand); |
1da177e4 LT |
629 | } |
630 | ||
ffac80e9 VP |
631 | MODULE_AUTHOR("Venkatesh Pallipadi <venkatesh.pallipadi@intel.com>"); |
632 | MODULE_AUTHOR("Alexey Starikovskiy <alexey.y.starikovskiy@intel.com>"); | |
633 | MODULE_DESCRIPTION("'cpufreq_ondemand' - A dynamic cpufreq governor for " | |
2b03f891 | 634 | "Low Latency Frequency Transition capable processors"); |
ffac80e9 | 635 | MODULE_LICENSE("GPL"); |
1da177e4 | 636 | |
6915719b JW |
637 | #ifdef CONFIG_CPU_FREQ_DEFAULT_GOV_ONDEMAND |
638 | fs_initcall(cpufreq_gov_dbs_init); | |
639 | #else | |
1da177e4 | 640 | module_init(cpufreq_gov_dbs_init); |
6915719b | 641 | #endif |
1da177e4 | 642 | module_exit(cpufreq_gov_dbs_exit); |