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 | ||
5ff0a268 | 15 | #include <linux/cpu.h> |
4471a34f | 16 | #include <linux/percpu-defs.h> |
4d5dcc42 | 17 | #include <linux/slab.h> |
80800913 | 18 | #include <linux/tick.h> |
4471a34f | 19 | #include "cpufreq_governor.h" |
1da177e4 | 20 | |
06eb09d1 | 21 | /* On-demand governor macros */ |
1da177e4 | 22 | #define DEF_FREQUENCY_UP_THRESHOLD (80) |
3f78a9f7 DN |
23 | #define DEF_SAMPLING_DOWN_FACTOR (1) |
24 | #define MAX_SAMPLING_DOWN_FACTOR (100000) | |
80800913 | 25 | #define MICRO_FREQUENCY_UP_THRESHOLD (95) |
cef9615a | 26 | #define MICRO_FREQUENCY_MIN_SAMPLE_RATE (10000) |
c29f1403 | 27 | #define MIN_FREQUENCY_UP_THRESHOLD (11) |
1da177e4 LT |
28 | #define MAX_FREQUENCY_UP_THRESHOLD (100) |
29 | ||
4471a34f | 30 | static DEFINE_PER_CPU(struct od_cpu_dbs_info_s, od_cpu_dbs_info); |
1da177e4 | 31 | |
fb30809e JS |
32 | static struct od_ops od_ops; |
33 | ||
3e33ee9e | 34 | static struct cpufreq_governor cpufreq_gov_ondemand; |
3e33ee9e | 35 | |
c2837558 JS |
36 | static unsigned int default_powersave_bias; |
37 | ||
4471a34f | 38 | static void ondemand_powersave_bias_init_cpu(int cpu) |
6b8fcd90 | 39 | { |
4471a34f | 40 | struct od_cpu_dbs_info_s *dbs_info = &per_cpu(od_cpu_dbs_info, cpu); |
6b8fcd90 | 41 | |
4471a34f VK |
42 | dbs_info->freq_table = cpufreq_frequency_get_table(cpu); |
43 | dbs_info->freq_lo = 0; | |
44 | } | |
6b8fcd90 | 45 | |
4471a34f VK |
46 | /* |
47 | * Not all CPUs want IO time to be accounted as busy; this depends on how | |
48 | * efficient idling at a higher frequency/voltage is. | |
49 | * Pavel Machek says this is not so for various generations of AMD and old | |
50 | * Intel systems. | |
06eb09d1 | 51 | * Mike Chan (android.com) claims this is also not true for ARM. |
4471a34f VK |
52 | * Because of this, whitelist specific known (series) of CPUs by default, and |
53 | * leave all others up to the user. | |
54 | */ | |
55 | static int should_io_be_busy(void) | |
56 | { | |
57 | #if defined(CONFIG_X86) | |
58 | /* | |
06eb09d1 | 59 | * For Intel, Core 2 (model 15) and later have an efficient idle. |
4471a34f VK |
60 | */ |
61 | if (boot_cpu_data.x86_vendor == X86_VENDOR_INTEL && | |
62 | boot_cpu_data.x86 == 6 && | |
63 | boot_cpu_data.x86_model >= 15) | |
64 | return 1; | |
65 | #endif | |
66 | return 0; | |
6b8fcd90 AV |
67 | } |
68 | ||
05ca0350 AS |
69 | /* |
70 | * Find right freq to be set now with powersave_bias on. | |
71 | * Returns the freq_hi to be used right now and will set freq_hi_jiffies, | |
72 | * freq_lo, and freq_lo_jiffies in percpu area for averaging freqs. | |
73 | */ | |
fb30809e | 74 | static unsigned int generic_powersave_bias_target(struct cpufreq_policy *policy, |
4471a34f | 75 | unsigned int freq_next, unsigned int relation) |
05ca0350 AS |
76 | { |
77 | unsigned int freq_req, freq_reduc, freq_avg; | |
78 | unsigned int freq_hi, freq_lo; | |
79 | unsigned int index = 0; | |
80 | unsigned int jiffies_total, jiffies_hi, jiffies_lo; | |
4471a34f | 81 | struct od_cpu_dbs_info_s *dbs_info = &per_cpu(od_cpu_dbs_info, |
245b2e70 | 82 | policy->cpu); |
4d5dcc42 VK |
83 | struct dbs_data *dbs_data = policy->governor_data; |
84 | struct od_dbs_tuners *od_tuners = dbs_data->tuners; | |
05ca0350 AS |
85 | |
86 | if (!dbs_info->freq_table) { | |
87 | dbs_info->freq_lo = 0; | |
88 | dbs_info->freq_lo_jiffies = 0; | |
89 | return freq_next; | |
90 | } | |
91 | ||
92 | cpufreq_frequency_table_target(policy, dbs_info->freq_table, freq_next, | |
93 | relation, &index); | |
94 | freq_req = dbs_info->freq_table[index].frequency; | |
4d5dcc42 | 95 | freq_reduc = freq_req * od_tuners->powersave_bias / 1000; |
05ca0350 AS |
96 | freq_avg = freq_req - freq_reduc; |
97 | ||
98 | /* Find freq bounds for freq_avg in freq_table */ | |
99 | index = 0; | |
100 | cpufreq_frequency_table_target(policy, dbs_info->freq_table, freq_avg, | |
101 | CPUFREQ_RELATION_H, &index); | |
102 | freq_lo = dbs_info->freq_table[index].frequency; | |
103 | index = 0; | |
104 | cpufreq_frequency_table_target(policy, dbs_info->freq_table, freq_avg, | |
105 | CPUFREQ_RELATION_L, &index); | |
106 | freq_hi = dbs_info->freq_table[index].frequency; | |
107 | ||
108 | /* Find out how long we have to be in hi and lo freqs */ | |
109 | if (freq_hi == freq_lo) { | |
110 | dbs_info->freq_lo = 0; | |
111 | dbs_info->freq_lo_jiffies = 0; | |
112 | return freq_lo; | |
113 | } | |
4d5dcc42 | 114 | jiffies_total = usecs_to_jiffies(od_tuners->sampling_rate); |
05ca0350 AS |
115 | jiffies_hi = (freq_avg - freq_lo) * jiffies_total; |
116 | jiffies_hi += ((freq_hi - freq_lo) / 2); | |
117 | jiffies_hi /= (freq_hi - freq_lo); | |
118 | jiffies_lo = jiffies_total - jiffies_hi; | |
119 | dbs_info->freq_lo = freq_lo; | |
120 | dbs_info->freq_lo_jiffies = jiffies_lo; | |
121 | dbs_info->freq_hi_jiffies = jiffies_hi; | |
122 | return freq_hi; | |
123 | } | |
124 | ||
125 | static void ondemand_powersave_bias_init(void) | |
126 | { | |
127 | int i; | |
128 | for_each_online_cpu(i) { | |
5a75c828 | 129 | ondemand_powersave_bias_init_cpu(i); |
05ca0350 AS |
130 | } |
131 | } | |
132 | ||
3a3e9e06 | 133 | static void dbs_freq_increase(struct cpufreq_policy *policy, unsigned int freq) |
4471a34f | 134 | { |
3a3e9e06 | 135 | struct dbs_data *dbs_data = policy->governor_data; |
4d5dcc42 VK |
136 | struct od_dbs_tuners *od_tuners = dbs_data->tuners; |
137 | ||
138 | if (od_tuners->powersave_bias) | |
3a3e9e06 | 139 | freq = od_ops.powersave_bias_target(policy, freq, |
fb30809e | 140 | CPUFREQ_RELATION_H); |
3a3e9e06 | 141 | else if (policy->cur == policy->max) |
4471a34f | 142 | return; |
0e625ac1 | 143 | |
3a3e9e06 | 144 | __cpufreq_driver_target(policy, freq, od_tuners->powersave_bias ? |
4471a34f VK |
145 | CPUFREQ_RELATION_L : CPUFREQ_RELATION_H); |
146 | } | |
147 | ||
148 | /* | |
149 | * Every sampling_rate, we check, if current idle time is less than 20% | |
dfa5bb62 SK |
150 | * (default), then we try to increase frequency. Else, we adjust the frequency |
151 | * proportional to load. | |
4471a34f | 152 | */ |
dfa5bb62 | 153 | static void od_check_cpu(int cpu, unsigned int load) |
1da177e4 | 154 | { |
4471a34f | 155 | struct od_cpu_dbs_info_s *dbs_info = &per_cpu(od_cpu_dbs_info, cpu); |
44152cb8 | 156 | struct cpufreq_policy *policy = dbs_info->cdbs.shared->policy; |
4d5dcc42 VK |
157 | struct dbs_data *dbs_data = policy->governor_data; |
158 | struct od_dbs_tuners *od_tuners = dbs_data->tuners; | |
4471a34f VK |
159 | |
160 | dbs_info->freq_lo = 0; | |
161 | ||
162 | /* Check for frequency increase */ | |
dfa5bb62 | 163 | if (load > od_tuners->up_threshold) { |
4471a34f VK |
164 | /* If switching to max speed, apply sampling_down_factor */ |
165 | if (policy->cur < policy->max) | |
166 | dbs_info->rate_mult = | |
4d5dcc42 | 167 | od_tuners->sampling_down_factor; |
4471a34f | 168 | dbs_freq_increase(policy, policy->max); |
dfa5bb62 SK |
169 | } else { |
170 | /* Calculate the next frequency proportional to load */ | |
6393d6a1 SK |
171 | unsigned int freq_next, min_f, max_f; |
172 | ||
173 | min_f = policy->cpuinfo.min_freq; | |
174 | max_f = policy->cpuinfo.max_freq; | |
175 | freq_next = min_f + load * (max_f - min_f) / 100; | |
4471a34f VK |
176 | |
177 | /* No longer fully busy, reset rate_mult */ | |
178 | dbs_info->rate_mult = 1; | |
179 | ||
4d5dcc42 | 180 | if (!od_tuners->powersave_bias) { |
4471a34f | 181 | __cpufreq_driver_target(policy, freq_next, |
6393d6a1 | 182 | CPUFREQ_RELATION_C); |
fb30809e | 183 | return; |
4471a34f | 184 | } |
fb30809e JS |
185 | |
186 | freq_next = od_ops.powersave_bias_target(policy, freq_next, | |
187 | CPUFREQ_RELATION_L); | |
6393d6a1 | 188 | __cpufreq_driver_target(policy, freq_next, CPUFREQ_RELATION_C); |
4471a34f | 189 | } |
1da177e4 LT |
190 | } |
191 | ||
9be4fd2c | 192 | static unsigned int od_dbs_timer(struct cpufreq_policy *policy) |
4471a34f | 193 | { |
affde5d0 | 194 | struct dbs_data *dbs_data = policy->governor_data; |
44152cb8 | 195 | unsigned int cpu = policy->cpu; |
43e0ee36 | 196 | struct od_cpu_dbs_info_s *dbs_info = &per_cpu(od_cpu_dbs_info, |
4447266b | 197 | cpu); |
4d5dcc42 | 198 | struct od_dbs_tuners *od_tuners = dbs_data->tuners; |
43e0ee36 | 199 | int delay = 0, sample_type = dbs_info->sample_type; |
4447266b | 200 | |
4471a34f | 201 | /* Common NORMAL_SAMPLE setup */ |
43e0ee36 | 202 | dbs_info->sample_type = OD_NORMAL_SAMPLE; |
4471a34f | 203 | if (sample_type == OD_SUB_SAMPLE) { |
43e0ee36 VK |
204 | delay = dbs_info->freq_lo_jiffies; |
205 | __cpufreq_driver_target(policy, dbs_info->freq_lo, | |
42994af6 | 206 | CPUFREQ_RELATION_H); |
4471a34f | 207 | } else { |
9d445920 | 208 | dbs_check_cpu(dbs_data, cpu); |
43e0ee36 | 209 | if (dbs_info->freq_lo) { |
4471a34f | 210 | /* Setup timer for SUB_SAMPLE */ |
43e0ee36 VK |
211 | dbs_info->sample_type = OD_SUB_SAMPLE; |
212 | delay = dbs_info->freq_hi_jiffies; | |
4471a34f VK |
213 | } |
214 | } | |
215 | ||
9d445920 VK |
216 | if (!delay) |
217 | delay = delay_for_sampling_rate(od_tuners->sampling_rate | |
43e0ee36 | 218 | * dbs_info->rate_mult); |
9d445920 | 219 | |
43e0ee36 | 220 | return delay; |
da53d61e FB |
221 | } |
222 | ||
4471a34f | 223 | /************************** sysfs interface ************************/ |
4d5dcc42 | 224 | static struct common_dbs_data od_dbs_cdata; |
1da177e4 | 225 | |
fd0ef7a0 MH |
226 | /** |
227 | * update_sampling_rate - update sampling rate effective immediately if needed. | |
228 | * @new_rate: new sampling rate | |
229 | * | |
06eb09d1 | 230 | * If new rate is smaller than the old, simply updating |
4471a34f VK |
231 | * dbs_tuners_int.sampling_rate might not be appropriate. For example, if the |
232 | * original sampling_rate was 1 second and the requested new sampling rate is 10 | |
233 | * ms because the user needs immediate reaction from ondemand governor, but not | |
234 | * sure if higher frequency will be required or not, then, the governor may | |
235 | * change the sampling rate too late; up to 1 second later. Thus, if we are | |
236 | * reducing the sampling rate, we need to make the new value effective | |
237 | * immediately. | |
fd0ef7a0 | 238 | */ |
4d5dcc42 VK |
239 | static void update_sampling_rate(struct dbs_data *dbs_data, |
240 | unsigned int new_rate) | |
fd0ef7a0 | 241 | { |
4d5dcc42 | 242 | struct od_dbs_tuners *od_tuners = dbs_data->tuners; |
f08f638b | 243 | struct cpumask cpumask; |
fd0ef7a0 MH |
244 | int cpu; |
245 | ||
4d5dcc42 VK |
246 | od_tuners->sampling_rate = new_rate = max(new_rate, |
247 | dbs_data->min_sampling_rate); | |
fd0ef7a0 | 248 | |
e128c864 VK |
249 | /* |
250 | * Lock governor so that governor start/stop can't execute in parallel. | |
251 | */ | |
252 | mutex_lock(&od_dbs_cdata.mutex); | |
253 | ||
f08f638b VK |
254 | cpumask_copy(&cpumask, cpu_online_mask); |
255 | ||
256 | for_each_cpu(cpu, &cpumask) { | |
fd0ef7a0 | 257 | struct cpufreq_policy *policy; |
4471a34f | 258 | struct od_cpu_dbs_info_s *dbs_info; |
e128c864 VK |
259 | struct cpu_dbs_info *cdbs; |
260 | struct cpu_common_dbs_info *shared; | |
fd0ef7a0 | 261 | |
e128c864 VK |
262 | dbs_info = &per_cpu(od_cpu_dbs_info, cpu); |
263 | cdbs = &dbs_info->cdbs; | |
264 | shared = cdbs->shared; | |
265 | ||
266 | /* | |
267 | * A valid shared and shared->policy means governor hasn't | |
268 | * stopped or exited yet. | |
269 | */ | |
270 | if (!shared || !shared->policy) | |
fd0ef7a0 | 271 | continue; |
e128c864 VK |
272 | |
273 | policy = shared->policy; | |
274 | ||
f08f638b VK |
275 | /* clear all CPUs of this policy */ |
276 | cpumask_andnot(&cpumask, &cpumask, policy->cpus); | |
277 | ||
e128c864 VK |
278 | /* |
279 | * Update sampling rate for CPUs whose policy is governed by | |
280 | * dbs_data. In case of governor_per_policy, only a single | |
281 | * policy will be governed by dbs_data, otherwise there can be | |
282 | * multiple policies that are governed by the same dbs_data. | |
283 | */ | |
9be4fd2c RW |
284 | if (dbs_data == policy->governor_data) { |
285 | mutex_lock(&shared->timer_mutex); | |
286 | /* | |
287 | * On 32-bit architectures this may race with the | |
288 | * sample_delay_ns read in dbs_update_util_handler(), | |
289 | * but that really doesn't matter. If the read returns | |
290 | * a value that's too big, the sample will be skipped, | |
291 | * but the next invocation of dbs_update_util_handler() | |
292 | * (when the update has been completed) will take a | |
293 | * sample. If the returned value is too small, the | |
294 | * sample will be taken immediately, but that isn't a | |
295 | * problem, as we want the new rate to take effect | |
296 | * immediately anyway. | |
297 | * | |
298 | * If this runs in parallel with dbs_work_handler(), we | |
299 | * may end up overwriting the sample_delay_ns value that | |
300 | * it has just written, but the difference should not be | |
301 | * too big and it will be corrected next time a sample | |
302 | * is taken, so it shouldn't be significant. | |
303 | */ | |
304 | gov_update_sample_delay(shared, new_rate); | |
305 | mutex_unlock(&shared->timer_mutex); | |
fd0ef7a0 | 306 | } |
fd0ef7a0 | 307 | } |
e128c864 VK |
308 | |
309 | mutex_unlock(&od_dbs_cdata.mutex); | |
fd0ef7a0 MH |
310 | } |
311 | ||
4d5dcc42 VK |
312 | static ssize_t store_sampling_rate(struct dbs_data *dbs_data, const char *buf, |
313 | size_t count) | |
1da177e4 LT |
314 | { |
315 | unsigned int input; | |
316 | int ret; | |
ffac80e9 | 317 | ret = sscanf(buf, "%u", &input); |
5a75c828 | 318 | if (ret != 1) |
319 | return -EINVAL; | |
4d5dcc42 VK |
320 | |
321 | update_sampling_rate(dbs_data, input); | |
1da177e4 LT |
322 | return count; |
323 | } | |
324 | ||
4d5dcc42 VK |
325 | static ssize_t store_io_is_busy(struct dbs_data *dbs_data, const char *buf, |
326 | size_t count) | |
19379b11 | 327 | { |
4d5dcc42 | 328 | struct od_dbs_tuners *od_tuners = dbs_data->tuners; |
19379b11 AV |
329 | unsigned int input; |
330 | int ret; | |
9366d840 | 331 | unsigned int j; |
19379b11 AV |
332 | |
333 | ret = sscanf(buf, "%u", &input); | |
334 | if (ret != 1) | |
335 | return -EINVAL; | |
4d5dcc42 | 336 | od_tuners->io_is_busy = !!input; |
9366d840 SK |
337 | |
338 | /* we need to re-evaluate prev_cpu_idle */ | |
339 | for_each_online_cpu(j) { | |
340 | struct od_cpu_dbs_info_s *dbs_info = &per_cpu(od_cpu_dbs_info, | |
341 | j); | |
342 | dbs_info->cdbs.prev_cpu_idle = get_cpu_idle_time(j, | |
343 | &dbs_info->cdbs.prev_cpu_wall, od_tuners->io_is_busy); | |
344 | } | |
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 | |
4d5dcc42 | 361 | od_tuners->up_threshold = input; |
1da177e4 LT |
362 | return count; |
363 | } | |
364 | ||
4d5dcc42 VK |
365 | static ssize_t store_sampling_down_factor(struct dbs_data *dbs_data, |
366 | const char *buf, size_t count) | |
3f78a9f7 | 367 | { |
4d5dcc42 | 368 | struct od_dbs_tuners *od_tuners = dbs_data->tuners; |
3f78a9f7 DN |
369 | unsigned int input, j; |
370 | int ret; | |
371 | ret = sscanf(buf, "%u", &input); | |
372 | ||
373 | if (ret != 1 || input > MAX_SAMPLING_DOWN_FACTOR || input < 1) | |
374 | return -EINVAL; | |
4d5dcc42 | 375 | od_tuners->sampling_down_factor = input; |
3f78a9f7 DN |
376 | |
377 | /* Reset down sampling multiplier in case it was active */ | |
378 | for_each_online_cpu(j) { | |
4471a34f VK |
379 | struct od_cpu_dbs_info_s *dbs_info = &per_cpu(od_cpu_dbs_info, |
380 | j); | |
3f78a9f7 DN |
381 | dbs_info->rate_mult = 1; |
382 | } | |
3f78a9f7 DN |
383 | return count; |
384 | } | |
385 | ||
6c4640c3 VK |
386 | static ssize_t store_ignore_nice_load(struct dbs_data *dbs_data, |
387 | const char *buf, size_t count) | |
3d5ee9e5 | 388 | { |
4d5dcc42 | 389 | struct od_dbs_tuners *od_tuners = dbs_data->tuners; |
3d5ee9e5 DJ |
390 | unsigned int input; |
391 | int ret; | |
392 | ||
393 | unsigned int j; | |
32ee8c3e | 394 | |
ffac80e9 | 395 | ret = sscanf(buf, "%u", &input); |
2b03f891 | 396 | if (ret != 1) |
3d5ee9e5 DJ |
397 | return -EINVAL; |
398 | ||
2b03f891 | 399 | if (input > 1) |
3d5ee9e5 | 400 | input = 1; |
32ee8c3e | 401 | |
6c4640c3 | 402 | if (input == od_tuners->ignore_nice_load) { /* nothing to do */ |
3d5ee9e5 DJ |
403 | return count; |
404 | } | |
6c4640c3 | 405 | od_tuners->ignore_nice_load = input; |
3d5ee9e5 | 406 | |
ccb2fe20 | 407 | /* we need to re-evaluate prev_cpu_idle */ |
dac1c1a5 | 408 | for_each_online_cpu(j) { |
4471a34f | 409 | struct od_cpu_dbs_info_s *dbs_info; |
245b2e70 | 410 | dbs_info = &per_cpu(od_cpu_dbs_info, j); |
4471a34f | 411 | dbs_info->cdbs.prev_cpu_idle = get_cpu_idle_time(j, |
9366d840 | 412 | &dbs_info->cdbs.prev_cpu_wall, od_tuners->io_is_busy); |
6c4640c3 | 413 | if (od_tuners->ignore_nice_load) |
4471a34f VK |
414 | dbs_info->cdbs.prev_cpu_nice = |
415 | kcpustat_cpu(j).cpustat[CPUTIME_NICE]; | |
1ca3abdb | 416 | |
3d5ee9e5 | 417 | } |
3d5ee9e5 DJ |
418 | return count; |
419 | } | |
420 | ||
4d5dcc42 VK |
421 | static ssize_t store_powersave_bias(struct dbs_data *dbs_data, const char *buf, |
422 | size_t count) | |
05ca0350 | 423 | { |
4d5dcc42 | 424 | struct od_dbs_tuners *od_tuners = dbs_data->tuners; |
05ca0350 AS |
425 | unsigned int input; |
426 | int ret; | |
427 | ret = sscanf(buf, "%u", &input); | |
428 | ||
429 | if (ret != 1) | |
430 | return -EINVAL; | |
431 | ||
432 | if (input > 1000) | |
433 | input = 1000; | |
434 | ||
4d5dcc42 | 435 | od_tuners->powersave_bias = input; |
05ca0350 | 436 | ondemand_powersave_bias_init(); |
05ca0350 AS |
437 | return count; |
438 | } | |
439 | ||
4d5dcc42 VK |
440 | show_store_one(od, sampling_rate); |
441 | show_store_one(od, io_is_busy); | |
442 | show_store_one(od, up_threshold); | |
443 | show_store_one(od, sampling_down_factor); | |
6c4640c3 | 444 | show_store_one(od, ignore_nice_load); |
4d5dcc42 VK |
445 | show_store_one(od, powersave_bias); |
446 | declare_show_sampling_rate_min(od); | |
447 | ||
448 | gov_sys_pol_attr_rw(sampling_rate); | |
449 | gov_sys_pol_attr_rw(io_is_busy); | |
450 | gov_sys_pol_attr_rw(up_threshold); | |
451 | gov_sys_pol_attr_rw(sampling_down_factor); | |
6c4640c3 | 452 | gov_sys_pol_attr_rw(ignore_nice_load); |
4d5dcc42 VK |
453 | gov_sys_pol_attr_rw(powersave_bias); |
454 | gov_sys_pol_attr_ro(sampling_rate_min); | |
455 | ||
456 | static struct attribute *dbs_attributes_gov_sys[] = { | |
457 | &sampling_rate_min_gov_sys.attr, | |
458 | &sampling_rate_gov_sys.attr, | |
459 | &up_threshold_gov_sys.attr, | |
460 | &sampling_down_factor_gov_sys.attr, | |
6c4640c3 | 461 | &ignore_nice_load_gov_sys.attr, |
4d5dcc42 VK |
462 | &powersave_bias_gov_sys.attr, |
463 | &io_is_busy_gov_sys.attr, | |
1da177e4 LT |
464 | NULL |
465 | }; | |
466 | ||
4d5dcc42 VK |
467 | static struct attribute_group od_attr_group_gov_sys = { |
468 | .attrs = dbs_attributes_gov_sys, | |
469 | .name = "ondemand", | |
470 | }; | |
471 | ||
472 | static struct attribute *dbs_attributes_gov_pol[] = { | |
473 | &sampling_rate_min_gov_pol.attr, | |
474 | &sampling_rate_gov_pol.attr, | |
475 | &up_threshold_gov_pol.attr, | |
476 | &sampling_down_factor_gov_pol.attr, | |
6c4640c3 | 477 | &ignore_nice_load_gov_pol.attr, |
4d5dcc42 VK |
478 | &powersave_bias_gov_pol.attr, |
479 | &io_is_busy_gov_pol.attr, | |
480 | NULL | |
481 | }; | |
482 | ||
483 | static struct attribute_group od_attr_group_gov_pol = { | |
484 | .attrs = dbs_attributes_gov_pol, | |
1da177e4 LT |
485 | .name = "ondemand", |
486 | }; | |
487 | ||
488 | /************************** sysfs end ************************/ | |
489 | ||
8e0484d2 | 490 | static int od_init(struct dbs_data *dbs_data, bool notify) |
4d5dcc42 VK |
491 | { |
492 | struct od_dbs_tuners *tuners; | |
493 | u64 idle_time; | |
494 | int cpu; | |
495 | ||
d5b73cd8 | 496 | tuners = kzalloc(sizeof(*tuners), GFP_KERNEL); |
4d5dcc42 VK |
497 | if (!tuners) { |
498 | pr_err("%s: kzalloc failed\n", __func__); | |
499 | return -ENOMEM; | |
500 | } | |
501 | ||
502 | cpu = get_cpu(); | |
503 | idle_time = get_cpu_idle_time_us(cpu, NULL); | |
504 | put_cpu(); | |
505 | if (idle_time != -1ULL) { | |
506 | /* Idle micro accounting is supported. Use finer thresholds */ | |
507 | tuners->up_threshold = MICRO_FREQUENCY_UP_THRESHOLD; | |
4d5dcc42 VK |
508 | /* |
509 | * In nohz/micro accounting case we set the minimum frequency | |
510 | * not depending on HZ, but fixed (very low). The deferred | |
511 | * timer might skip some samples if idle/sleeping as needed. | |
512 | */ | |
513 | dbs_data->min_sampling_rate = MICRO_FREQUENCY_MIN_SAMPLE_RATE; | |
514 | } else { | |
515 | tuners->up_threshold = DEF_FREQUENCY_UP_THRESHOLD; | |
4d5dcc42 VK |
516 | |
517 | /* For correct statistics, we need 10 ticks for each measure */ | |
518 | dbs_data->min_sampling_rate = MIN_SAMPLING_RATE_RATIO * | |
519 | jiffies_to_usecs(10); | |
520 | } | |
521 | ||
522 | tuners->sampling_down_factor = DEF_SAMPLING_DOWN_FACTOR; | |
6c4640c3 | 523 | tuners->ignore_nice_load = 0; |
c2837558 | 524 | tuners->powersave_bias = default_powersave_bias; |
4d5dcc42 VK |
525 | tuners->io_is_busy = should_io_be_busy(); |
526 | ||
527 | dbs_data->tuners = tuners; | |
4d5dcc42 VK |
528 | return 0; |
529 | } | |
530 | ||
8e0484d2 | 531 | static void od_exit(struct dbs_data *dbs_data, bool notify) |
4d5dcc42 VK |
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, | |
732b6d61 | 555 | .mutex = __MUTEX_INITIALIZER(od_dbs_cdata.mutex), |
4471a34f | 556 | }; |
1da177e4 | 557 | |
de1df26b RW |
558 | static int od_cpufreq_governor_dbs(struct cpufreq_policy *policy, |
559 | unsigned int event) | |
560 | { | |
561 | return cpufreq_governor_dbs(policy, &od_dbs_cdata, event); | |
562 | } | |
563 | ||
564 | static struct cpufreq_governor cpufreq_gov_ondemand = { | |
565 | .name = "ondemand", | |
566 | .governor = od_cpufreq_governor_dbs, | |
567 | .max_transition_latency = TRANSITION_LATENCY_LIMIT, | |
568 | .owner = THIS_MODULE, | |
569 | }; | |
570 | ||
fb30809e JS |
571 | static void od_set_powersave_bias(unsigned int powersave_bias) |
572 | { | |
573 | struct cpufreq_policy *policy; | |
574 | struct dbs_data *dbs_data; | |
575 | struct od_dbs_tuners *od_tuners; | |
576 | unsigned int cpu; | |
577 | cpumask_t done; | |
578 | ||
c2837558 | 579 | default_powersave_bias = powersave_bias; |
fb30809e JS |
580 | cpumask_clear(&done); |
581 | ||
582 | get_online_cpus(); | |
583 | for_each_online_cpu(cpu) { | |
44152cb8 VK |
584 | struct cpu_common_dbs_info *shared; |
585 | ||
fb30809e JS |
586 | if (cpumask_test_cpu(cpu, &done)) |
587 | continue; | |
588 | ||
44152cb8 VK |
589 | shared = per_cpu(od_cpu_dbs_info, cpu).cdbs.shared; |
590 | if (!shared) | |
c2837558 | 591 | continue; |
fb30809e | 592 | |
44152cb8 | 593 | policy = shared->policy; |
fb30809e | 594 | cpumask_or(&done, &done, policy->cpus); |
c2837558 JS |
595 | |
596 | if (policy->governor != &cpufreq_gov_ondemand) | |
597 | continue; | |
598 | ||
599 | dbs_data = policy->governor_data; | |
600 | od_tuners = dbs_data->tuners; | |
601 | od_tuners->powersave_bias = default_powersave_bias; | |
fb30809e JS |
602 | } |
603 | put_online_cpus(); | |
604 | } | |
605 | ||
606 | void od_register_powersave_bias_handler(unsigned int (*f) | |
607 | (struct cpufreq_policy *, unsigned int, unsigned int), | |
608 | unsigned int powersave_bias) | |
609 | { | |
610 | od_ops.powersave_bias_target = f; | |
611 | od_set_powersave_bias(powersave_bias); | |
612 | } | |
613 | EXPORT_SYMBOL_GPL(od_register_powersave_bias_handler); | |
614 | ||
615 | void od_unregister_powersave_bias_handler(void) | |
616 | { | |
617 | od_ops.powersave_bias_target = generic_powersave_bias_target; | |
618 | od_set_powersave_bias(0); | |
619 | } | |
620 | EXPORT_SYMBOL_GPL(od_unregister_powersave_bias_handler); | |
621 | ||
1da177e4 LT |
622 | static int __init cpufreq_gov_dbs_init(void) |
623 | { | |
57df5573 | 624 | return cpufreq_register_governor(&cpufreq_gov_ondemand); |
1da177e4 LT |
625 | } |
626 | ||
627 | static void __exit cpufreq_gov_dbs_exit(void) | |
628 | { | |
1c256245 | 629 | cpufreq_unregister_governor(&cpufreq_gov_ondemand); |
1da177e4 LT |
630 | } |
631 | ||
ffac80e9 VP |
632 | MODULE_AUTHOR("Venkatesh Pallipadi <venkatesh.pallipadi@intel.com>"); |
633 | MODULE_AUTHOR("Alexey Starikovskiy <alexey.y.starikovskiy@intel.com>"); | |
634 | MODULE_DESCRIPTION("'cpufreq_ondemand' - A dynamic cpufreq governor for " | |
2b03f891 | 635 | "Low Latency Frequency Transition capable processors"); |
ffac80e9 | 636 | MODULE_LICENSE("GPL"); |
1da177e4 | 637 | |
6915719b | 638 | #ifdef CONFIG_CPU_FREQ_DEFAULT_GOV_ONDEMAND |
de1df26b RW |
639 | struct cpufreq_governor *cpufreq_default_governor(void) |
640 | { | |
641 | return &cpufreq_gov_ondemand; | |
642 | } | |
643 | ||
6915719b JW |
644 | fs_initcall(cpufreq_gov_dbs_init); |
645 | #else | |
1da177e4 | 646 | module_init(cpufreq_gov_dbs_init); |
6915719b | 647 | #endif |
1da177e4 | 648 | module_exit(cpufreq_gov_dbs_exit); |