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> |
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; | |
68 | unsigned int index = 0; | |
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; |
05ca0350 AS |
74 | |
75 | if (!dbs_info->freq_table) { | |
76 | dbs_info->freq_lo = 0; | |
07aa4402 | 77 | dbs_info->freq_lo_delay_us = 0; |
05ca0350 AS |
78 | return freq_next; |
79 | } | |
80 | ||
81 | cpufreq_frequency_table_target(policy, dbs_info->freq_table, freq_next, | |
82 | relation, &index); | |
83 | freq_req = dbs_info->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 */ | |
88 | index = 0; | |
89 | cpufreq_frequency_table_target(policy, dbs_info->freq_table, freq_avg, | |
90 | CPUFREQ_RELATION_H, &index); | |
91 | freq_lo = dbs_info->freq_table[index].frequency; | |
92 | index = 0; | |
93 | cpufreq_frequency_table_target(policy, dbs_info->freq_table, freq_avg, | |
94 | CPUFREQ_RELATION_L, &index); | |
95 | freq_hi = dbs_info->freq_table[index].frequency; | |
96 | ||
97 | /* Find out how long we have to be in hi and lo freqs */ | |
98 | if (freq_hi == freq_lo) { | |
99 | dbs_info->freq_lo = 0; | |
07aa4402 | 100 | dbs_info->freq_lo_delay_us = 0; |
05ca0350 AS |
101 | return freq_lo; |
102 | } | |
07aa4402 RW |
103 | delay_hi_us = (freq_avg - freq_lo) * dbs_data->sampling_rate; |
104 | delay_hi_us += (freq_hi - freq_lo) / 2; | |
105 | delay_hi_us /= freq_hi - freq_lo; | |
106 | dbs_info->freq_hi_delay_us = delay_hi_us; | |
05ca0350 | 107 | dbs_info->freq_lo = freq_lo; |
07aa4402 | 108 | dbs_info->freq_lo_delay_us = dbs_data->sampling_rate - delay_hi_us; |
05ca0350 AS |
109 | return freq_hi; |
110 | } | |
111 | ||
d1db75ff | 112 | static void ondemand_powersave_bias_init(struct cpufreq_policy *policy) |
05ca0350 | 113 | { |
7d5a9956 | 114 | struct od_policy_dbs_info *dbs_info = to_dbs_info(policy->governor_data); |
d1db75ff | 115 | |
7d5a9956 | 116 | dbs_info->freq_table = cpufreq_frequency_get_table(policy->cpu); |
d1db75ff | 117 | dbs_info->freq_lo = 0; |
05ca0350 AS |
118 | } |
119 | ||
3a3e9e06 | 120 | static void dbs_freq_increase(struct cpufreq_policy *policy, unsigned int freq) |
4471a34f | 121 | { |
bc505475 RW |
122 | struct policy_dbs_info *policy_dbs = policy->governor_data; |
123 | struct dbs_data *dbs_data = policy_dbs->dbs_data; | |
4d5dcc42 VK |
124 | struct od_dbs_tuners *od_tuners = dbs_data->tuners; |
125 | ||
126 | if (od_tuners->powersave_bias) | |
3a3e9e06 | 127 | freq = od_ops.powersave_bias_target(policy, freq, |
fb30809e | 128 | CPUFREQ_RELATION_H); |
3a3e9e06 | 129 | else if (policy->cur == policy->max) |
4471a34f | 130 | return; |
0e625ac1 | 131 | |
3a3e9e06 | 132 | __cpufreq_driver_target(policy, freq, od_tuners->powersave_bias ? |
4471a34f VK |
133 | CPUFREQ_RELATION_L : CPUFREQ_RELATION_H); |
134 | } | |
135 | ||
136 | /* | |
137 | * Every sampling_rate, we check, if current idle time is less than 20% | |
dfa5bb62 SK |
138 | * (default), then we try to increase frequency. Else, we adjust the frequency |
139 | * proportional to load. | |
4471a34f | 140 | */ |
4cccf755 | 141 | static void od_update(struct cpufreq_policy *policy) |
1da177e4 | 142 | { |
7d5a9956 RW |
143 | struct policy_dbs_info *policy_dbs = policy->governor_data; |
144 | struct od_policy_dbs_info *dbs_info = to_dbs_info(policy_dbs); | |
bc505475 | 145 | struct dbs_data *dbs_data = policy_dbs->dbs_data; |
4d5dcc42 | 146 | struct od_dbs_tuners *od_tuners = dbs_data->tuners; |
4cccf755 | 147 | unsigned int load = dbs_update(policy); |
4471a34f VK |
148 | |
149 | dbs_info->freq_lo = 0; | |
150 | ||
151 | /* Check for frequency increase */ | |
ff4b1789 | 152 | if (load > dbs_data->up_threshold) { |
4471a34f VK |
153 | /* If switching to max speed, apply sampling_down_factor */ |
154 | if (policy->cur < policy->max) | |
57dc3bcd | 155 | policy_dbs->rate_mult = dbs_data->sampling_down_factor; |
4471a34f | 156 | dbs_freq_increase(policy, policy->max); |
dfa5bb62 SK |
157 | } else { |
158 | /* Calculate the next frequency proportional to load */ | |
6393d6a1 SK |
159 | unsigned int freq_next, min_f, max_f; |
160 | ||
161 | min_f = policy->cpuinfo.min_freq; | |
162 | max_f = policy->cpuinfo.max_freq; | |
163 | freq_next = min_f + load * (max_f - min_f) / 100; | |
4471a34f VK |
164 | |
165 | /* No longer fully busy, reset rate_mult */ | |
57dc3bcd | 166 | policy_dbs->rate_mult = 1; |
4471a34f | 167 | |
a7f35cff RW |
168 | if (od_tuners->powersave_bias) |
169 | freq_next = od_ops.powersave_bias_target(policy, | |
170 | freq_next, | |
171 | CPUFREQ_RELATION_L); | |
172 | ||
6393d6a1 | 173 | __cpufreq_driver_target(policy, freq_next, CPUFREQ_RELATION_C); |
4471a34f | 174 | } |
1da177e4 LT |
175 | } |
176 | ||
9be4fd2c | 177 | static unsigned int od_dbs_timer(struct cpufreq_policy *policy) |
4471a34f | 178 | { |
bc505475 RW |
179 | struct policy_dbs_info *policy_dbs = policy->governor_data; |
180 | struct dbs_data *dbs_data = policy_dbs->dbs_data; | |
7d5a9956 | 181 | struct od_policy_dbs_info *dbs_info = to_dbs_info(policy_dbs); |
6e96c5b3 | 182 | int sample_type = dbs_info->sample_type; |
4447266b | 183 | |
4471a34f | 184 | /* Common NORMAL_SAMPLE setup */ |
43e0ee36 | 185 | dbs_info->sample_type = OD_NORMAL_SAMPLE; |
4cccf755 RW |
186 | /* |
187 | * OD_SUB_SAMPLE doesn't make sense if sample_delay_ns is 0, so ignore | |
188 | * it then. | |
189 | */ | |
190 | if (sample_type == OD_SUB_SAMPLE && policy_dbs->sample_delay_ns > 0) { | |
43e0ee36 | 191 | __cpufreq_driver_target(policy, dbs_info->freq_lo, |
42994af6 | 192 | CPUFREQ_RELATION_H); |
07aa4402 | 193 | return dbs_info->freq_lo_delay_us; |
6e96c5b3 RW |
194 | } |
195 | ||
196 | od_update(policy); | |
197 | ||
198 | if (dbs_info->freq_lo) { | |
199 | /* Setup timer for SUB_SAMPLE */ | |
200 | dbs_info->sample_type = OD_SUB_SAMPLE; | |
07aa4402 | 201 | return dbs_info->freq_hi_delay_us; |
4471a34f VK |
202 | } |
203 | ||
07aa4402 | 204 | return dbs_data->sampling_rate * policy_dbs->rate_mult; |
da53d61e FB |
205 | } |
206 | ||
4471a34f | 207 | /************************** sysfs interface ************************/ |
7bdad34d | 208 | static struct dbs_governor od_dbs_gov; |
1da177e4 | 209 | |
4d5dcc42 VK |
210 | static ssize_t store_io_is_busy(struct dbs_data *dbs_data, const char *buf, |
211 | size_t count) | |
19379b11 AV |
212 | { |
213 | unsigned int input; | |
214 | int ret; | |
215 | ||
216 | ret = sscanf(buf, "%u", &input); | |
217 | if (ret != 1) | |
218 | return -EINVAL; | |
8847e038 | 219 | dbs_data->io_is_busy = !!input; |
9366d840 SK |
220 | |
221 | /* we need to re-evaluate prev_cpu_idle */ | |
8c8f77fd | 222 | gov_update_cpu_data(dbs_data); |
a33cce1c | 223 | |
19379b11 AV |
224 | return count; |
225 | } | |
226 | ||
4d5dcc42 VK |
227 | static ssize_t store_up_threshold(struct dbs_data *dbs_data, const char *buf, |
228 | size_t count) | |
1da177e4 LT |
229 | { |
230 | unsigned int input; | |
231 | int ret; | |
ffac80e9 | 232 | ret = sscanf(buf, "%u", &input); |
1da177e4 | 233 | |
32ee8c3e | 234 | if (ret != 1 || input > MAX_FREQUENCY_UP_THRESHOLD || |
c29f1403 | 235 | input < MIN_FREQUENCY_UP_THRESHOLD) { |
1da177e4 LT |
236 | return -EINVAL; |
237 | } | |
4bd4e428 | 238 | |
ff4b1789 | 239 | dbs_data->up_threshold = input; |
1da177e4 LT |
240 | return count; |
241 | } | |
242 | ||
4d5dcc42 VK |
243 | static ssize_t store_sampling_down_factor(struct dbs_data *dbs_data, |
244 | const char *buf, size_t count) | |
3f78a9f7 | 245 | { |
57dc3bcd RW |
246 | struct policy_dbs_info *policy_dbs; |
247 | unsigned int input; | |
3f78a9f7 DN |
248 | int ret; |
249 | ret = sscanf(buf, "%u", &input); | |
250 | ||
251 | if (ret != 1 || input > MAX_SAMPLING_DOWN_FACTOR || input < 1) | |
252 | return -EINVAL; | |
57dc3bcd | 253 | |
ff4b1789 | 254 | dbs_data->sampling_down_factor = input; |
3f78a9f7 DN |
255 | |
256 | /* Reset down sampling multiplier in case it was active */ | |
57dc3bcd RW |
257 | list_for_each_entry(policy_dbs, &dbs_data->policy_dbs_list, list) { |
258 | /* | |
259 | * Doing this without locking might lead to using different | |
260 | * rate_mult values in od_update() and od_dbs_timer(). | |
261 | */ | |
262 | mutex_lock(&policy_dbs->timer_mutex); | |
263 | policy_dbs->rate_mult = 1; | |
264 | mutex_unlock(&policy_dbs->timer_mutex); | |
3f78a9f7 | 265 | } |
57dc3bcd | 266 | |
3f78a9f7 DN |
267 | return count; |
268 | } | |
269 | ||
6c4640c3 VK |
270 | static ssize_t store_ignore_nice_load(struct dbs_data *dbs_data, |
271 | const char *buf, size_t count) | |
3d5ee9e5 DJ |
272 | { |
273 | unsigned int input; | |
274 | int ret; | |
275 | ||
ffac80e9 | 276 | ret = sscanf(buf, "%u", &input); |
2b03f891 | 277 | if (ret != 1) |
3d5ee9e5 DJ |
278 | return -EINVAL; |
279 | ||
2b03f891 | 280 | if (input > 1) |
3d5ee9e5 | 281 | input = 1; |
32ee8c3e | 282 | |
ff4b1789 | 283 | if (input == dbs_data->ignore_nice_load) { /* nothing to do */ |
3d5ee9e5 DJ |
284 | return count; |
285 | } | |
ff4b1789 | 286 | dbs_data->ignore_nice_load = input; |
3d5ee9e5 | 287 | |
ccb2fe20 | 288 | /* we need to re-evaluate prev_cpu_idle */ |
8c8f77fd | 289 | gov_update_cpu_data(dbs_data); |
1ca3abdb | 290 | |
3d5ee9e5 DJ |
291 | return count; |
292 | } | |
293 | ||
4d5dcc42 VK |
294 | static ssize_t store_powersave_bias(struct dbs_data *dbs_data, const char *buf, |
295 | size_t count) | |
05ca0350 | 296 | { |
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 RW |
310 | |
311 | list_for_each_entry(policy_dbs, &dbs_data->policy_dbs_list, list) | |
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 | ||
8e0484d2 | 359 | static int od_init(struct dbs_data *dbs_data, bool notify) |
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); |
4d5dcc42 VK |
366 | if (!tuners) { |
367 | pr_err("%s: kzalloc failed\n", __func__); | |
368 | return -ENOMEM; | |
369 | } | |
370 | ||
371 | cpu = get_cpu(); | |
372 | idle_time = get_cpu_idle_time_us(cpu, NULL); | |
373 | put_cpu(); | |
374 | if (idle_time != -1ULL) { | |
375 | /* Idle micro accounting is supported. Use finer thresholds */ | |
ff4b1789 | 376 | dbs_data->up_threshold = MICRO_FREQUENCY_UP_THRESHOLD; |
4d5dcc42 VK |
377 | /* |
378 | * In nohz/micro accounting case we set the minimum frequency | |
379 | * not depending on HZ, but fixed (very low). The deferred | |
380 | * timer might skip some samples if idle/sleeping as needed. | |
381 | */ | |
382 | dbs_data->min_sampling_rate = MICRO_FREQUENCY_MIN_SAMPLE_RATE; | |
383 | } else { | |
ff4b1789 | 384 | dbs_data->up_threshold = DEF_FREQUENCY_UP_THRESHOLD; |
4d5dcc42 VK |
385 | |
386 | /* For correct statistics, we need 10 ticks for each measure */ | |
387 | dbs_data->min_sampling_rate = MIN_SAMPLING_RATE_RATIO * | |
388 | jiffies_to_usecs(10); | |
389 | } | |
390 | ||
ff4b1789 VK |
391 | dbs_data->sampling_down_factor = DEF_SAMPLING_DOWN_FACTOR; |
392 | dbs_data->ignore_nice_load = 0; | |
c2837558 | 393 | tuners->powersave_bias = default_powersave_bias; |
8847e038 | 394 | dbs_data->io_is_busy = should_io_be_busy(); |
4d5dcc42 VK |
395 | |
396 | dbs_data->tuners = tuners; | |
4d5dcc42 VK |
397 | return 0; |
398 | } | |
399 | ||
8e0484d2 | 400 | static void od_exit(struct dbs_data *dbs_data, bool notify) |
4d5dcc42 VK |
401 | { |
402 | kfree(dbs_data->tuners); | |
403 | } | |
404 | ||
702c9e54 RW |
405 | static void od_start(struct cpufreq_policy *policy) |
406 | { | |
7d5a9956 | 407 | struct od_policy_dbs_info *dbs_info = to_dbs_info(policy->governor_data); |
702c9e54 RW |
408 | |
409 | dbs_info->sample_type = OD_NORMAL_SAMPLE; | |
d1db75ff | 410 | ondemand_powersave_bias_init(policy); |
702c9e54 RW |
411 | } |
412 | ||
4471a34f | 413 | static struct od_ops od_ops = { |
fb30809e | 414 | .powersave_bias_target = generic_powersave_bias_target, |
4471a34f | 415 | }; |
2f8a835c | 416 | |
7bdad34d | 417 | static struct dbs_governor od_dbs_gov = { |
af926185 RW |
418 | .gov = { |
419 | .name = "ondemand", | |
906a6e5a | 420 | .governor = cpufreq_governor_dbs, |
af926185 RW |
421 | .max_transition_latency = TRANSITION_LATENCY_LIMIT, |
422 | .owner = THIS_MODULE, | |
423 | }, | |
c4435630 | 424 | .kobj_type = { .default_attrs = od_attributes }, |
4471a34f | 425 | .gov_dbs_timer = od_dbs_timer, |
7d5a9956 RW |
426 | .alloc = od_alloc, |
427 | .free = od_free, | |
4d5dcc42 VK |
428 | .init = od_init, |
429 | .exit = od_exit, | |
702c9e54 | 430 | .start = od_start, |
4471a34f | 431 | }; |
1da177e4 | 432 | |
7bdad34d | 433 | #define CPU_FREQ_GOV_ONDEMAND (&od_dbs_gov.gov) |
af926185 | 434 | |
fb30809e JS |
435 | static void od_set_powersave_bias(unsigned int powersave_bias) |
436 | { | |
fb30809e JS |
437 | unsigned int cpu; |
438 | cpumask_t done; | |
439 | ||
c2837558 | 440 | default_powersave_bias = powersave_bias; |
fb30809e JS |
441 | cpumask_clear(&done); |
442 | ||
443 | get_online_cpus(); | |
444 | for_each_online_cpu(cpu) { | |
8c8f77fd | 445 | struct cpufreq_policy *policy; |
e40e7b25 | 446 | struct policy_dbs_info *policy_dbs; |
8c8f77fd RW |
447 | struct dbs_data *dbs_data; |
448 | struct od_dbs_tuners *od_tuners; | |
44152cb8 | 449 | |
fb30809e JS |
450 | if (cpumask_test_cpu(cpu, &done)) |
451 | continue; | |
452 | ||
8c8f77fd RW |
453 | policy = cpufreq_cpu_get_raw(cpu); |
454 | if (!policy || policy->governor != CPU_FREQ_GOV_ONDEMAND) | |
455 | continue; | |
456 | ||
457 | policy_dbs = policy->governor_data; | |
e40e7b25 | 458 | if (!policy_dbs) |
c2837558 | 459 | continue; |
fb30809e JS |
460 | |
461 | cpumask_or(&done, &done, policy->cpus); | |
c2837558 | 462 | |
bc505475 | 463 | dbs_data = policy_dbs->dbs_data; |
c2837558 JS |
464 | od_tuners = dbs_data->tuners; |
465 | od_tuners->powersave_bias = default_powersave_bias; | |
fb30809e JS |
466 | } |
467 | put_online_cpus(); | |
468 | } | |
469 | ||
470 | void od_register_powersave_bias_handler(unsigned int (*f) | |
471 | (struct cpufreq_policy *, unsigned int, unsigned int), | |
472 | unsigned int powersave_bias) | |
473 | { | |
474 | od_ops.powersave_bias_target = f; | |
475 | od_set_powersave_bias(powersave_bias); | |
476 | } | |
477 | EXPORT_SYMBOL_GPL(od_register_powersave_bias_handler); | |
478 | ||
479 | void od_unregister_powersave_bias_handler(void) | |
480 | { | |
481 | od_ops.powersave_bias_target = generic_powersave_bias_target; | |
482 | od_set_powersave_bias(0); | |
483 | } | |
484 | EXPORT_SYMBOL_GPL(od_unregister_powersave_bias_handler); | |
485 | ||
1da177e4 LT |
486 | static int __init cpufreq_gov_dbs_init(void) |
487 | { | |
af926185 | 488 | return cpufreq_register_governor(CPU_FREQ_GOV_ONDEMAND); |
1da177e4 LT |
489 | } |
490 | ||
491 | static void __exit cpufreq_gov_dbs_exit(void) | |
492 | { | |
af926185 | 493 | cpufreq_unregister_governor(CPU_FREQ_GOV_ONDEMAND); |
1da177e4 LT |
494 | } |
495 | ||
ffac80e9 VP |
496 | MODULE_AUTHOR("Venkatesh Pallipadi <venkatesh.pallipadi@intel.com>"); |
497 | MODULE_AUTHOR("Alexey Starikovskiy <alexey.y.starikovskiy@intel.com>"); | |
498 | MODULE_DESCRIPTION("'cpufreq_ondemand' - A dynamic cpufreq governor for " | |
2b03f891 | 499 | "Low Latency Frequency Transition capable processors"); |
ffac80e9 | 500 | MODULE_LICENSE("GPL"); |
1da177e4 | 501 | |
6915719b | 502 | #ifdef CONFIG_CPU_FREQ_DEFAULT_GOV_ONDEMAND |
de1df26b RW |
503 | struct cpufreq_governor *cpufreq_default_governor(void) |
504 | { | |
af926185 | 505 | return CPU_FREQ_GOV_ONDEMAND; |
de1df26b RW |
506 | } |
507 | ||
6915719b JW |
508 | fs_initcall(cpufreq_gov_dbs_init); |
509 | #else | |
1da177e4 | 510 | module_init(cpufreq_gov_dbs_init); |
6915719b | 511 | #endif |
1da177e4 | 512 | module_exit(cpufreq_gov_dbs_exit); |