Commit | Line | Data |
---|---|---|
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> |
7d5a9956 RW |
19 | |
20 | #include "cpufreq_ondemand.h" | |
1da177e4 | 21 | |
06eb09d1 | 22 | /* On-demand governor macros */ |
1da177e4 | 23 | #define DEF_FREQUENCY_UP_THRESHOLD (80) |
3f78a9f7 DN |
24 | #define DEF_SAMPLING_DOWN_FACTOR (1) |
25 | #define MAX_SAMPLING_DOWN_FACTOR (100000) | |
80800913 | 26 | #define MICRO_FREQUENCY_UP_THRESHOLD (95) |
cef9615a | 27 | #define MICRO_FREQUENCY_MIN_SAMPLE_RATE (10000) |
c29f1403 | 28 | #define MIN_FREQUENCY_UP_THRESHOLD (11) |
1da177e4 LT |
29 | #define MAX_FREQUENCY_UP_THRESHOLD (100) |
30 | ||
fb30809e JS |
31 | static struct od_ops od_ops; |
32 | ||
c2837558 JS |
33 | static unsigned int default_powersave_bias; |
34 | ||
4471a34f VK |
35 | /* |
36 | * Not all CPUs want IO time to be accounted as busy; this depends on how | |
37 | * efficient idling at a higher frequency/voltage is. | |
38 | * Pavel Machek says this is not so for various generations of AMD and old | |
39 | * Intel systems. | |
06eb09d1 | 40 | * Mike Chan (android.com) claims this is also not true for ARM. |
4471a34f VK |
41 | * Because of this, whitelist specific known (series) of CPUs by default, and |
42 | * leave all others up to the user. | |
43 | */ | |
44 | static int should_io_be_busy(void) | |
45 | { | |
46 | #if defined(CONFIG_X86) | |
47 | /* | |
06eb09d1 | 48 | * For Intel, Core 2 (model 15) and later have an efficient idle. |
4471a34f VK |
49 | */ |
50 | if (boot_cpu_data.x86_vendor == X86_VENDOR_INTEL && | |
51 | boot_cpu_data.x86 == 6 && | |
52 | boot_cpu_data.x86_model >= 15) | |
53 | return 1; | |
54 | #endif | |
55 | return 0; | |
6b8fcd90 AV |
56 | } |
57 | ||
05ca0350 AS |
58 | /* |
59 | * Find right freq to be set now with powersave_bias on. | |
07aa4402 RW |
60 | * Returns the freq_hi to be used right now and will set freq_hi_delay_us, |
61 | * freq_lo, and freq_lo_delay_us in percpu area for averaging freqs. | |
05ca0350 | 62 | */ |
fb30809e | 63 | static unsigned int generic_powersave_bias_target(struct cpufreq_policy *policy, |
4471a34f | 64 | unsigned int freq_next, unsigned int relation) |
05ca0350 AS |
65 | { |
66 | unsigned int freq_req, freq_reduc, freq_avg; | |
67 | unsigned int freq_hi, freq_lo; | |
d218ed77 | 68 | unsigned int index; |
07aa4402 | 69 | unsigned int delay_hi_us; |
bc505475 | 70 | struct policy_dbs_info *policy_dbs = policy->governor_data; |
7d5a9956 | 71 | struct od_policy_dbs_info *dbs_info = to_dbs_info(policy_dbs); |
bc505475 | 72 | struct dbs_data *dbs_data = policy_dbs->dbs_data; |
4d5dcc42 | 73 | struct od_dbs_tuners *od_tuners = dbs_data->tuners; |
34ac5d7a | 74 | struct cpufreq_frequency_table *freq_table = policy->freq_table; |
05ca0350 | 75 | |
34ac5d7a | 76 | if (!freq_table) { |
05ca0350 | 77 | dbs_info->freq_lo = 0; |
07aa4402 | 78 | dbs_info->freq_lo_delay_us = 0; |
05ca0350 AS |
79 | return freq_next; |
80 | } | |
81 | ||
d218ed77 | 82 | index = cpufreq_frequency_table_target(policy, freq_next, relation); |
34ac5d7a | 83 | freq_req = freq_table[index].frequency; |
4d5dcc42 | 84 | freq_reduc = freq_req * od_tuners->powersave_bias / 1000; |
05ca0350 AS |
85 | freq_avg = freq_req - freq_reduc; |
86 | ||
87 | /* Find freq bounds for freq_avg in freq_table */ | |
82577360 | 88 | index = cpufreq_table_find_index_h(policy, freq_avg); |
34ac5d7a | 89 | freq_lo = freq_table[index].frequency; |
82577360 | 90 | index = cpufreq_table_find_index_l(policy, freq_avg); |
34ac5d7a | 91 | freq_hi = freq_table[index].frequency; |
05ca0350 AS |
92 | |
93 | /* Find out how long we have to be in hi and lo freqs */ | |
94 | if (freq_hi == freq_lo) { | |
95 | dbs_info->freq_lo = 0; | |
07aa4402 | 96 | dbs_info->freq_lo_delay_us = 0; |
05ca0350 AS |
97 | return freq_lo; |
98 | } | |
07aa4402 RW |
99 | delay_hi_us = (freq_avg - freq_lo) * dbs_data->sampling_rate; |
100 | delay_hi_us += (freq_hi - freq_lo) / 2; | |
101 | delay_hi_us /= freq_hi - freq_lo; | |
102 | dbs_info->freq_hi_delay_us = delay_hi_us; | |
05ca0350 | 103 | dbs_info->freq_lo = freq_lo; |
07aa4402 | 104 | dbs_info->freq_lo_delay_us = dbs_data->sampling_rate - delay_hi_us; |
05ca0350 AS |
105 | return freq_hi; |
106 | } | |
107 | ||
d1db75ff | 108 | static void ondemand_powersave_bias_init(struct cpufreq_policy *policy) |
05ca0350 | 109 | { |
7d5a9956 | 110 | struct od_policy_dbs_info *dbs_info = to_dbs_info(policy->governor_data); |
d1db75ff | 111 | |
d1db75ff | 112 | dbs_info->freq_lo = 0; |
05ca0350 AS |
113 | } |
114 | ||
3a3e9e06 | 115 | static void dbs_freq_increase(struct cpufreq_policy *policy, unsigned int freq) |
4471a34f | 116 | { |
bc505475 RW |
117 | struct policy_dbs_info *policy_dbs = policy->governor_data; |
118 | struct dbs_data *dbs_data = policy_dbs->dbs_data; | |
4d5dcc42 VK |
119 | struct od_dbs_tuners *od_tuners = dbs_data->tuners; |
120 | ||
121 | if (od_tuners->powersave_bias) | |
3a3e9e06 | 122 | freq = od_ops.powersave_bias_target(policy, freq, |
fb30809e | 123 | CPUFREQ_RELATION_H); |
3a3e9e06 | 124 | else if (policy->cur == policy->max) |
4471a34f | 125 | return; |
0e625ac1 | 126 | |
3a3e9e06 | 127 | __cpufreq_driver_target(policy, freq, od_tuners->powersave_bias ? |
4471a34f VK |
128 | CPUFREQ_RELATION_L : CPUFREQ_RELATION_H); |
129 | } | |
130 | ||
131 | /* | |
132 | * Every sampling_rate, we check, if current idle time is less than 20% | |
dfa5bb62 SK |
133 | * (default), then we try to increase frequency. Else, we adjust the frequency |
134 | * proportional to load. | |
4471a34f | 135 | */ |
4cccf755 | 136 | static void od_update(struct cpufreq_policy *policy) |
1da177e4 | 137 | { |
7d5a9956 RW |
138 | struct policy_dbs_info *policy_dbs = policy->governor_data; |
139 | struct od_policy_dbs_info *dbs_info = to_dbs_info(policy_dbs); | |
bc505475 | 140 | struct dbs_data *dbs_data = policy_dbs->dbs_data; |
4d5dcc42 | 141 | struct od_dbs_tuners *od_tuners = dbs_data->tuners; |
4cccf755 | 142 | unsigned int load = dbs_update(policy); |
4471a34f VK |
143 | |
144 | dbs_info->freq_lo = 0; | |
145 | ||
146 | /* Check for frequency increase */ | |
ff4b1789 | 147 | if (load > dbs_data->up_threshold) { |
4471a34f VK |
148 | /* If switching to max speed, apply sampling_down_factor */ |
149 | if (policy->cur < policy->max) | |
57dc3bcd | 150 | policy_dbs->rate_mult = dbs_data->sampling_down_factor; |
4471a34f | 151 | dbs_freq_increase(policy, policy->max); |
dfa5bb62 SK |
152 | } else { |
153 | /* Calculate the next frequency proportional to load */ | |
6393d6a1 SK |
154 | unsigned int freq_next, min_f, max_f; |
155 | ||
156 | min_f = policy->cpuinfo.min_freq; | |
157 | max_f = policy->cpuinfo.max_freq; | |
158 | freq_next = min_f + load * (max_f - min_f) / 100; | |
4471a34f VK |
159 | |
160 | /* No longer fully busy, reset rate_mult */ | |
57dc3bcd | 161 | policy_dbs->rate_mult = 1; |
4471a34f | 162 | |
a7f35cff RW |
163 | if (od_tuners->powersave_bias) |
164 | freq_next = od_ops.powersave_bias_target(policy, | |
165 | freq_next, | |
166 | CPUFREQ_RELATION_L); | |
167 | ||
6393d6a1 | 168 | __cpufreq_driver_target(policy, freq_next, CPUFREQ_RELATION_C); |
4471a34f | 169 | } |
1da177e4 LT |
170 | } |
171 | ||
9be4fd2c | 172 | static unsigned int od_dbs_timer(struct cpufreq_policy *policy) |
4471a34f | 173 | { |
bc505475 RW |
174 | struct policy_dbs_info *policy_dbs = policy->governor_data; |
175 | struct dbs_data *dbs_data = policy_dbs->dbs_data; | |
7d5a9956 | 176 | struct od_policy_dbs_info *dbs_info = to_dbs_info(policy_dbs); |
6e96c5b3 | 177 | int sample_type = dbs_info->sample_type; |
4447266b | 178 | |
4471a34f | 179 | /* Common NORMAL_SAMPLE setup */ |
43e0ee36 | 180 | dbs_info->sample_type = OD_NORMAL_SAMPLE; |
4cccf755 RW |
181 | /* |
182 | * OD_SUB_SAMPLE doesn't make sense if sample_delay_ns is 0, so ignore | |
183 | * it then. | |
184 | */ | |
185 | if (sample_type == OD_SUB_SAMPLE && policy_dbs->sample_delay_ns > 0) { | |
43e0ee36 | 186 | __cpufreq_driver_target(policy, dbs_info->freq_lo, |
42994af6 | 187 | CPUFREQ_RELATION_H); |
07aa4402 | 188 | return dbs_info->freq_lo_delay_us; |
6e96c5b3 RW |
189 | } |
190 | ||
191 | od_update(policy); | |
192 | ||
193 | if (dbs_info->freq_lo) { | |
194 | /* Setup timer for SUB_SAMPLE */ | |
195 | dbs_info->sample_type = OD_SUB_SAMPLE; | |
07aa4402 | 196 | return dbs_info->freq_hi_delay_us; |
4471a34f VK |
197 | } |
198 | ||
07aa4402 | 199 | return dbs_data->sampling_rate * policy_dbs->rate_mult; |
da53d61e FB |
200 | } |
201 | ||
4471a34f | 202 | /************************** sysfs interface ************************/ |
7bdad34d | 203 | static struct dbs_governor od_dbs_gov; |
1da177e4 | 204 | |
0dd3c1d6 RW |
205 | static ssize_t store_io_is_busy(struct gov_attr_set *attr_set, const char *buf, |
206 | size_t count) | |
19379b11 | 207 | { |
0dd3c1d6 | 208 | struct dbs_data *dbs_data = to_dbs_data(attr_set); |
19379b11 AV |
209 | unsigned int input; |
210 | int ret; | |
211 | ||
212 | ret = sscanf(buf, "%u", &input); | |
213 | if (ret != 1) | |
214 | return -EINVAL; | |
8847e038 | 215 | dbs_data->io_is_busy = !!input; |
9366d840 SK |
216 | |
217 | /* we need to re-evaluate prev_cpu_idle */ | |
8c8f77fd | 218 | gov_update_cpu_data(dbs_data); |
a33cce1c | 219 | |
19379b11 AV |
220 | return count; |
221 | } | |
222 | ||
0dd3c1d6 RW |
223 | static ssize_t store_up_threshold(struct gov_attr_set *attr_set, |
224 | const char *buf, size_t count) | |
1da177e4 | 225 | { |
0dd3c1d6 | 226 | struct dbs_data *dbs_data = to_dbs_data(attr_set); |
1da177e4 LT |
227 | unsigned int input; |
228 | int ret; | |
ffac80e9 | 229 | ret = sscanf(buf, "%u", &input); |
1da177e4 | 230 | |
32ee8c3e | 231 | if (ret != 1 || input > MAX_FREQUENCY_UP_THRESHOLD || |
c29f1403 | 232 | input < MIN_FREQUENCY_UP_THRESHOLD) { |
1da177e4 LT |
233 | return -EINVAL; |
234 | } | |
4bd4e428 | 235 | |
ff4b1789 | 236 | dbs_data->up_threshold = input; |
1da177e4 LT |
237 | return count; |
238 | } | |
239 | ||
0dd3c1d6 RW |
240 | static ssize_t store_sampling_down_factor(struct gov_attr_set *attr_set, |
241 | const char *buf, size_t count) | |
3f78a9f7 | 242 | { |
0dd3c1d6 | 243 | struct dbs_data *dbs_data = to_dbs_data(attr_set); |
57dc3bcd RW |
244 | struct policy_dbs_info *policy_dbs; |
245 | unsigned int input; | |
3f78a9f7 DN |
246 | int ret; |
247 | ret = sscanf(buf, "%u", &input); | |
248 | ||
249 | if (ret != 1 || input > MAX_SAMPLING_DOWN_FACTOR || input < 1) | |
250 | return -EINVAL; | |
57dc3bcd | 251 | |
ff4b1789 | 252 | dbs_data->sampling_down_factor = input; |
3f78a9f7 DN |
253 | |
254 | /* Reset down sampling multiplier in case it was active */ | |
0dd3c1d6 | 255 | list_for_each_entry(policy_dbs, &attr_set->policy_list, list) { |
57dc3bcd RW |
256 | /* |
257 | * Doing this without locking might lead to using different | |
258 | * rate_mult values in od_update() and od_dbs_timer(). | |
259 | */ | |
260 | mutex_lock(&policy_dbs->timer_mutex); | |
261 | policy_dbs->rate_mult = 1; | |
262 | mutex_unlock(&policy_dbs->timer_mutex); | |
3f78a9f7 | 263 | } |
57dc3bcd | 264 | |
3f78a9f7 DN |
265 | return count; |
266 | } | |
267 | ||
0dd3c1d6 RW |
268 | static ssize_t store_ignore_nice_load(struct gov_attr_set *attr_set, |
269 | const char *buf, size_t count) | |
3d5ee9e5 | 270 | { |
0dd3c1d6 | 271 | struct dbs_data *dbs_data = to_dbs_data(attr_set); |
3d5ee9e5 DJ |
272 | unsigned int input; |
273 | int ret; | |
274 | ||
ffac80e9 | 275 | ret = sscanf(buf, "%u", &input); |
2b03f891 | 276 | if (ret != 1) |
3d5ee9e5 DJ |
277 | return -EINVAL; |
278 | ||
2b03f891 | 279 | if (input > 1) |
3d5ee9e5 | 280 | input = 1; |
32ee8c3e | 281 | |
ff4b1789 | 282 | if (input == dbs_data->ignore_nice_load) { /* nothing to do */ |
3d5ee9e5 DJ |
283 | return count; |
284 | } | |
ff4b1789 | 285 | dbs_data->ignore_nice_load = input; |
3d5ee9e5 | 286 | |
ccb2fe20 | 287 | /* we need to re-evaluate prev_cpu_idle */ |
8c8f77fd | 288 | gov_update_cpu_data(dbs_data); |
1ca3abdb | 289 | |
3d5ee9e5 DJ |
290 | return count; |
291 | } | |
292 | ||
0dd3c1d6 RW |
293 | static ssize_t store_powersave_bias(struct gov_attr_set *attr_set, |
294 | const char *buf, size_t count) | |
05ca0350 | 295 | { |
0dd3c1d6 | 296 | struct dbs_data *dbs_data = to_dbs_data(attr_set); |
4d5dcc42 | 297 | struct od_dbs_tuners *od_tuners = dbs_data->tuners; |
d1db75ff | 298 | struct policy_dbs_info *policy_dbs; |
05ca0350 AS |
299 | unsigned int input; |
300 | int ret; | |
301 | ret = sscanf(buf, "%u", &input); | |
302 | ||
303 | if (ret != 1) | |
304 | return -EINVAL; | |
305 | ||
306 | if (input > 1000) | |
307 | input = 1000; | |
308 | ||
4d5dcc42 | 309 | od_tuners->powersave_bias = input; |
d1db75ff | 310 | |
0dd3c1d6 | 311 | list_for_each_entry(policy_dbs, &attr_set->policy_list, list) |
d1db75ff RW |
312 | ondemand_powersave_bias_init(policy_dbs->policy); |
313 | ||
05ca0350 AS |
314 | return count; |
315 | } | |
316 | ||
c4435630 VK |
317 | gov_show_one_common(sampling_rate); |
318 | gov_show_one_common(up_threshold); | |
319 | gov_show_one_common(sampling_down_factor); | |
320 | gov_show_one_common(ignore_nice_load); | |
321 | gov_show_one_common(min_sampling_rate); | |
8847e038 | 322 | gov_show_one_common(io_is_busy); |
c4435630 VK |
323 | gov_show_one(od, powersave_bias); |
324 | ||
325 | gov_attr_rw(sampling_rate); | |
326 | gov_attr_rw(io_is_busy); | |
327 | gov_attr_rw(up_threshold); | |
328 | gov_attr_rw(sampling_down_factor); | |
329 | gov_attr_rw(ignore_nice_load); | |
330 | gov_attr_rw(powersave_bias); | |
331 | gov_attr_ro(min_sampling_rate); | |
332 | ||
333 | static struct attribute *od_attributes[] = { | |
334 | &min_sampling_rate.attr, | |
335 | &sampling_rate.attr, | |
336 | &up_threshold.attr, | |
337 | &sampling_down_factor.attr, | |
338 | &ignore_nice_load.attr, | |
339 | &powersave_bias.attr, | |
340 | &io_is_busy.attr, | |
1da177e4 LT |
341 | NULL |
342 | }; | |
343 | ||
1da177e4 LT |
344 | /************************** sysfs end ************************/ |
345 | ||
7d5a9956 RW |
346 | static struct policy_dbs_info *od_alloc(void) |
347 | { | |
348 | struct od_policy_dbs_info *dbs_info; | |
349 | ||
350 | dbs_info = kzalloc(sizeof(*dbs_info), GFP_KERNEL); | |
351 | return dbs_info ? &dbs_info->policy_dbs : NULL; | |
352 | } | |
353 | ||
354 | static void od_free(struct policy_dbs_info *policy_dbs) | |
355 | { | |
356 | kfree(to_dbs_info(policy_dbs)); | |
357 | } | |
358 | ||
9a15fb2c | 359 | static int od_init(struct dbs_data *dbs_data) |
4d5dcc42 VK |
360 | { |
361 | struct od_dbs_tuners *tuners; | |
362 | u64 idle_time; | |
363 | int cpu; | |
364 | ||
d5b73cd8 | 365 | tuners = kzalloc(sizeof(*tuners), GFP_KERNEL); |
a69d6b29 | 366 | if (!tuners) |
4d5dcc42 | 367 | return -ENOMEM; |
4d5dcc42 VK |
368 | |
369 | cpu = get_cpu(); | |
370 | idle_time = get_cpu_idle_time_us(cpu, NULL); | |
371 | put_cpu(); | |
372 | if (idle_time != -1ULL) { | |
373 | /* Idle micro accounting is supported. Use finer thresholds */ | |
ff4b1789 | 374 | dbs_data->up_threshold = MICRO_FREQUENCY_UP_THRESHOLD; |
4d5dcc42 VK |
375 | /* |
376 | * In nohz/micro accounting case we set the minimum frequency | |
377 | * not depending on HZ, but fixed (very low). The deferred | |
378 | * timer might skip some samples if idle/sleeping as needed. | |
379 | */ | |
380 | dbs_data->min_sampling_rate = MICRO_FREQUENCY_MIN_SAMPLE_RATE; | |
381 | } else { | |
ff4b1789 | 382 | dbs_data->up_threshold = DEF_FREQUENCY_UP_THRESHOLD; |
4d5dcc42 VK |
383 | |
384 | /* For correct statistics, we need 10 ticks for each measure */ | |
385 | dbs_data->min_sampling_rate = MIN_SAMPLING_RATE_RATIO * | |
386 | jiffies_to_usecs(10); | |
387 | } | |
388 | ||
ff4b1789 VK |
389 | dbs_data->sampling_down_factor = DEF_SAMPLING_DOWN_FACTOR; |
390 | dbs_data->ignore_nice_load = 0; | |
c2837558 | 391 | tuners->powersave_bias = default_powersave_bias; |
8847e038 | 392 | dbs_data->io_is_busy = should_io_be_busy(); |
4d5dcc42 VK |
393 | |
394 | dbs_data->tuners = tuners; | |
4d5dcc42 VK |
395 | return 0; |
396 | } | |
397 | ||
9a15fb2c | 398 | static void od_exit(struct dbs_data *dbs_data) |
4d5dcc42 VK |
399 | { |
400 | kfree(dbs_data->tuners); | |
401 | } | |
402 | ||
702c9e54 RW |
403 | static void od_start(struct cpufreq_policy *policy) |
404 | { | |
7d5a9956 | 405 | struct od_policy_dbs_info *dbs_info = to_dbs_info(policy->governor_data); |
702c9e54 RW |
406 | |
407 | dbs_info->sample_type = OD_NORMAL_SAMPLE; | |
d1db75ff | 408 | ondemand_powersave_bias_init(policy); |
702c9e54 RW |
409 | } |
410 | ||
4471a34f | 411 | static struct od_ops od_ops = { |
fb30809e | 412 | .powersave_bias_target = generic_powersave_bias_target, |
4471a34f | 413 | }; |
2f8a835c | 414 | |
7bdad34d | 415 | static struct dbs_governor od_dbs_gov = { |
e788892b | 416 | .gov = CPUFREQ_DBS_GOVERNOR_INITIALIZER("ondemand"), |
c4435630 | 417 | .kobj_type = { .default_attrs = od_attributes }, |
4471a34f | 418 | .gov_dbs_timer = od_dbs_timer, |
7d5a9956 RW |
419 | .alloc = od_alloc, |
420 | .free = od_free, | |
4d5dcc42 VK |
421 | .init = od_init, |
422 | .exit = od_exit, | |
702c9e54 | 423 | .start = od_start, |
4471a34f | 424 | }; |
1da177e4 | 425 | |
7bdad34d | 426 | #define CPU_FREQ_GOV_ONDEMAND (&od_dbs_gov.gov) |
af926185 | 427 | |
fb30809e JS |
428 | static void od_set_powersave_bias(unsigned int powersave_bias) |
429 | { | |
fb30809e JS |
430 | unsigned int cpu; |
431 | cpumask_t done; | |
432 | ||
c2837558 | 433 | default_powersave_bias = powersave_bias; |
fb30809e JS |
434 | cpumask_clear(&done); |
435 | ||
436 | get_online_cpus(); | |
437 | for_each_online_cpu(cpu) { | |
8c8f77fd | 438 | struct cpufreq_policy *policy; |
e40e7b25 | 439 | struct policy_dbs_info *policy_dbs; |
8c8f77fd RW |
440 | struct dbs_data *dbs_data; |
441 | struct od_dbs_tuners *od_tuners; | |
44152cb8 | 442 | |
fb30809e JS |
443 | if (cpumask_test_cpu(cpu, &done)) |
444 | continue; | |
445 | ||
8c8f77fd RW |
446 | policy = cpufreq_cpu_get_raw(cpu); |
447 | if (!policy || policy->governor != CPU_FREQ_GOV_ONDEMAND) | |
448 | continue; | |
449 | ||
450 | policy_dbs = policy->governor_data; | |
e40e7b25 | 451 | if (!policy_dbs) |
c2837558 | 452 | continue; |
fb30809e JS |
453 | |
454 | cpumask_or(&done, &done, policy->cpus); | |
c2837558 | 455 | |
bc505475 | 456 | dbs_data = policy_dbs->dbs_data; |
c2837558 JS |
457 | od_tuners = dbs_data->tuners; |
458 | od_tuners->powersave_bias = default_powersave_bias; | |
fb30809e JS |
459 | } |
460 | put_online_cpus(); | |
461 | } | |
462 | ||
463 | void od_register_powersave_bias_handler(unsigned int (*f) | |
464 | (struct cpufreq_policy *, unsigned int, unsigned int), | |
465 | unsigned int powersave_bias) | |
466 | { | |
467 | od_ops.powersave_bias_target = f; | |
468 | od_set_powersave_bias(powersave_bias); | |
469 | } | |
470 | EXPORT_SYMBOL_GPL(od_register_powersave_bias_handler); | |
471 | ||
472 | void od_unregister_powersave_bias_handler(void) | |
473 | { | |
474 | od_ops.powersave_bias_target = generic_powersave_bias_target; | |
475 | od_set_powersave_bias(0); | |
476 | } | |
477 | EXPORT_SYMBOL_GPL(od_unregister_powersave_bias_handler); | |
478 | ||
1da177e4 LT |
479 | static int __init cpufreq_gov_dbs_init(void) |
480 | { | |
af926185 | 481 | return cpufreq_register_governor(CPU_FREQ_GOV_ONDEMAND); |
1da177e4 LT |
482 | } |
483 | ||
484 | static void __exit cpufreq_gov_dbs_exit(void) | |
485 | { | |
af926185 | 486 | cpufreq_unregister_governor(CPU_FREQ_GOV_ONDEMAND); |
1da177e4 LT |
487 | } |
488 | ||
ffac80e9 VP |
489 | MODULE_AUTHOR("Venkatesh Pallipadi <venkatesh.pallipadi@intel.com>"); |
490 | MODULE_AUTHOR("Alexey Starikovskiy <alexey.y.starikovskiy@intel.com>"); | |
491 | MODULE_DESCRIPTION("'cpufreq_ondemand' - A dynamic cpufreq governor for " | |
2b03f891 | 492 | "Low Latency Frequency Transition capable processors"); |
ffac80e9 | 493 | MODULE_LICENSE("GPL"); |
1da177e4 | 494 | |
6915719b | 495 | #ifdef CONFIG_CPU_FREQ_DEFAULT_GOV_ONDEMAND |
de1df26b RW |
496 | struct cpufreq_governor *cpufreq_default_governor(void) |
497 | { | |
af926185 | 498 | return CPU_FREQ_GOV_ONDEMAND; |
de1df26b RW |
499 | } |
500 | ||
6915719b JW |
501 | fs_initcall(cpufreq_gov_dbs_init); |
502 | #else | |
1da177e4 | 503 | module_init(cpufreq_gov_dbs_init); |
6915719b | 504 | #endif |
1da177e4 | 505 | module_exit(cpufreq_gov_dbs_exit); |