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 | ||
4471a34f | 31 | static DEFINE_PER_CPU(struct od_cpu_dbs_info_s, od_cpu_dbs_info); |
1da177e4 | 32 | |
a33cce1c | 33 | static struct dbs_governor od_dbs_gov; |
fb30809e JS |
34 | static struct od_ops od_ops; |
35 | ||
c2837558 JS |
36 | static unsigned int default_powersave_bias; |
37 | ||
4471a34f VK |
38 | /* |
39 | * Not all CPUs want IO time to be accounted as busy; this depends on how | |
40 | * efficient idling at a higher frequency/voltage is. | |
41 | * Pavel Machek says this is not so for various generations of AMD and old | |
42 | * Intel systems. | |
06eb09d1 | 43 | * Mike Chan (android.com) claims this is also not true for ARM. |
4471a34f VK |
44 | * Because of this, whitelist specific known (series) of CPUs by default, and |
45 | * leave all others up to the user. | |
46 | */ | |
47 | static int should_io_be_busy(void) | |
48 | { | |
49 | #if defined(CONFIG_X86) | |
50 | /* | |
06eb09d1 | 51 | * For Intel, Core 2 (model 15) and later have an efficient idle. |
4471a34f VK |
52 | */ |
53 | if (boot_cpu_data.x86_vendor == X86_VENDOR_INTEL && | |
54 | boot_cpu_data.x86 == 6 && | |
55 | boot_cpu_data.x86_model >= 15) | |
56 | return 1; | |
57 | #endif | |
58 | return 0; | |
6b8fcd90 AV |
59 | } |
60 | ||
05ca0350 AS |
61 | /* |
62 | * Find right freq to be set now with powersave_bias on. | |
07aa4402 RW |
63 | * Returns the freq_hi to be used right now and will set freq_hi_delay_us, |
64 | * freq_lo, and freq_lo_delay_us in percpu area for averaging freqs. | |
05ca0350 | 65 | */ |
fb30809e | 66 | static unsigned int generic_powersave_bias_target(struct cpufreq_policy *policy, |
4471a34f | 67 | unsigned int freq_next, unsigned int relation) |
05ca0350 AS |
68 | { |
69 | unsigned int freq_req, freq_reduc, freq_avg; | |
70 | unsigned int freq_hi, freq_lo; | |
71 | unsigned int index = 0; | |
07aa4402 | 72 | unsigned int delay_hi_us; |
bc505475 | 73 | struct policy_dbs_info *policy_dbs = policy->governor_data; |
7d5a9956 | 74 | struct od_policy_dbs_info *dbs_info = to_dbs_info(policy_dbs); |
bc505475 | 75 | struct dbs_data *dbs_data = policy_dbs->dbs_data; |
4d5dcc42 | 76 | struct od_dbs_tuners *od_tuners = dbs_data->tuners; |
05ca0350 AS |
77 | |
78 | if (!dbs_info->freq_table) { | |
79 | dbs_info->freq_lo = 0; | |
07aa4402 | 80 | dbs_info->freq_lo_delay_us = 0; |
05ca0350 AS |
81 | return freq_next; |
82 | } | |
83 | ||
84 | cpufreq_frequency_table_target(policy, dbs_info->freq_table, freq_next, | |
85 | relation, &index); | |
86 | freq_req = dbs_info->freq_table[index].frequency; | |
4d5dcc42 | 87 | freq_reduc = freq_req * od_tuners->powersave_bias / 1000; |
05ca0350 AS |
88 | freq_avg = freq_req - freq_reduc; |
89 | ||
90 | /* Find freq bounds for freq_avg in freq_table */ | |
91 | index = 0; | |
92 | cpufreq_frequency_table_target(policy, dbs_info->freq_table, freq_avg, | |
93 | CPUFREQ_RELATION_H, &index); | |
94 | freq_lo = dbs_info->freq_table[index].frequency; | |
95 | index = 0; | |
96 | cpufreq_frequency_table_target(policy, dbs_info->freq_table, freq_avg, | |
97 | CPUFREQ_RELATION_L, &index); | |
98 | freq_hi = dbs_info->freq_table[index].frequency; | |
99 | ||
100 | /* Find out how long we have to be in hi and lo freqs */ | |
101 | if (freq_hi == freq_lo) { | |
102 | dbs_info->freq_lo = 0; | |
07aa4402 | 103 | dbs_info->freq_lo_delay_us = 0; |
05ca0350 AS |
104 | return freq_lo; |
105 | } | |
07aa4402 RW |
106 | delay_hi_us = (freq_avg - freq_lo) * dbs_data->sampling_rate; |
107 | delay_hi_us += (freq_hi - freq_lo) / 2; | |
108 | delay_hi_us /= freq_hi - freq_lo; | |
109 | dbs_info->freq_hi_delay_us = delay_hi_us; | |
05ca0350 | 110 | dbs_info->freq_lo = freq_lo; |
07aa4402 | 111 | dbs_info->freq_lo_delay_us = dbs_data->sampling_rate - delay_hi_us; |
05ca0350 AS |
112 | return freq_hi; |
113 | } | |
114 | ||
d1db75ff | 115 | static void ondemand_powersave_bias_init(struct cpufreq_policy *policy) |
05ca0350 | 116 | { |
7d5a9956 | 117 | struct od_policy_dbs_info *dbs_info = to_dbs_info(policy->governor_data); |
d1db75ff | 118 | |
7d5a9956 | 119 | dbs_info->freq_table = cpufreq_frequency_get_table(policy->cpu); |
d1db75ff | 120 | dbs_info->freq_lo = 0; |
05ca0350 AS |
121 | } |
122 | ||
3a3e9e06 | 123 | static void dbs_freq_increase(struct cpufreq_policy *policy, unsigned int freq) |
4471a34f | 124 | { |
bc505475 RW |
125 | struct policy_dbs_info *policy_dbs = policy->governor_data; |
126 | struct dbs_data *dbs_data = policy_dbs->dbs_data; | |
4d5dcc42 VK |
127 | struct od_dbs_tuners *od_tuners = dbs_data->tuners; |
128 | ||
129 | if (od_tuners->powersave_bias) | |
3a3e9e06 | 130 | freq = od_ops.powersave_bias_target(policy, freq, |
fb30809e | 131 | CPUFREQ_RELATION_H); |
3a3e9e06 | 132 | else if (policy->cur == policy->max) |
4471a34f | 133 | return; |
0e625ac1 | 134 | |
3a3e9e06 | 135 | __cpufreq_driver_target(policy, freq, od_tuners->powersave_bias ? |
4471a34f VK |
136 | CPUFREQ_RELATION_L : CPUFREQ_RELATION_H); |
137 | } | |
138 | ||
139 | /* | |
140 | * Every sampling_rate, we check, if current idle time is less than 20% | |
dfa5bb62 SK |
141 | * (default), then we try to increase frequency. Else, we adjust the frequency |
142 | * proportional to load. | |
4471a34f | 143 | */ |
4cccf755 | 144 | static void od_update(struct cpufreq_policy *policy) |
1da177e4 | 145 | { |
7d5a9956 RW |
146 | struct policy_dbs_info *policy_dbs = policy->governor_data; |
147 | struct od_policy_dbs_info *dbs_info = to_dbs_info(policy_dbs); | |
bc505475 | 148 | struct dbs_data *dbs_data = policy_dbs->dbs_data; |
4d5dcc42 | 149 | struct od_dbs_tuners *od_tuners = dbs_data->tuners; |
4cccf755 | 150 | unsigned int load = dbs_update(policy); |
4471a34f VK |
151 | |
152 | dbs_info->freq_lo = 0; | |
153 | ||
154 | /* Check for frequency increase */ | |
ff4b1789 | 155 | if (load > dbs_data->up_threshold) { |
4471a34f VK |
156 | /* If switching to max speed, apply sampling_down_factor */ |
157 | if (policy->cur < policy->max) | |
57dc3bcd | 158 | policy_dbs->rate_mult = dbs_data->sampling_down_factor; |
4471a34f | 159 | dbs_freq_increase(policy, policy->max); |
dfa5bb62 SK |
160 | } else { |
161 | /* Calculate the next frequency proportional to load */ | |
6393d6a1 SK |
162 | unsigned int freq_next, min_f, max_f; |
163 | ||
164 | min_f = policy->cpuinfo.min_freq; | |
165 | max_f = policy->cpuinfo.max_freq; | |
166 | freq_next = min_f + load * (max_f - min_f) / 100; | |
4471a34f VK |
167 | |
168 | /* No longer fully busy, reset rate_mult */ | |
57dc3bcd | 169 | policy_dbs->rate_mult = 1; |
4471a34f | 170 | |
a7f35cff RW |
171 | if (od_tuners->powersave_bias) |
172 | freq_next = od_ops.powersave_bias_target(policy, | |
173 | freq_next, | |
174 | CPUFREQ_RELATION_L); | |
175 | ||
6393d6a1 | 176 | __cpufreq_driver_target(policy, freq_next, CPUFREQ_RELATION_C); |
4471a34f | 177 | } |
1da177e4 LT |
178 | } |
179 | ||
9be4fd2c | 180 | static unsigned int od_dbs_timer(struct cpufreq_policy *policy) |
4471a34f | 181 | { |
bc505475 RW |
182 | struct policy_dbs_info *policy_dbs = policy->governor_data; |
183 | struct dbs_data *dbs_data = policy_dbs->dbs_data; | |
7d5a9956 | 184 | struct od_policy_dbs_info *dbs_info = to_dbs_info(policy_dbs); |
6e96c5b3 | 185 | int sample_type = dbs_info->sample_type; |
4447266b | 186 | |
4471a34f | 187 | /* Common NORMAL_SAMPLE setup */ |
43e0ee36 | 188 | dbs_info->sample_type = OD_NORMAL_SAMPLE; |
4cccf755 RW |
189 | /* |
190 | * OD_SUB_SAMPLE doesn't make sense if sample_delay_ns is 0, so ignore | |
191 | * it then. | |
192 | */ | |
193 | if (sample_type == OD_SUB_SAMPLE && policy_dbs->sample_delay_ns > 0) { | |
43e0ee36 | 194 | __cpufreq_driver_target(policy, dbs_info->freq_lo, |
42994af6 | 195 | CPUFREQ_RELATION_H); |
07aa4402 | 196 | return dbs_info->freq_lo_delay_us; |
6e96c5b3 RW |
197 | } |
198 | ||
199 | od_update(policy); | |
200 | ||
201 | if (dbs_info->freq_lo) { | |
202 | /* Setup timer for SUB_SAMPLE */ | |
203 | dbs_info->sample_type = OD_SUB_SAMPLE; | |
07aa4402 | 204 | return dbs_info->freq_hi_delay_us; |
4471a34f VK |
205 | } |
206 | ||
07aa4402 | 207 | return dbs_data->sampling_rate * policy_dbs->rate_mult; |
da53d61e FB |
208 | } |
209 | ||
4471a34f | 210 | /************************** sysfs interface ************************/ |
7bdad34d | 211 | static struct dbs_governor od_dbs_gov; |
1da177e4 | 212 | |
4d5dcc42 VK |
213 | static ssize_t store_io_is_busy(struct dbs_data *dbs_data, const char *buf, |
214 | size_t count) | |
19379b11 AV |
215 | { |
216 | unsigned int input; | |
217 | int ret; | |
218 | ||
219 | ret = sscanf(buf, "%u", &input); | |
220 | if (ret != 1) | |
221 | return -EINVAL; | |
8847e038 | 222 | dbs_data->io_is_busy = !!input; |
9366d840 SK |
223 | |
224 | /* we need to re-evaluate prev_cpu_idle */ | |
a33cce1c RW |
225 | gov_update_cpu_data(&od_dbs_gov, dbs_data); |
226 | ||
19379b11 AV |
227 | return count; |
228 | } | |
229 | ||
4d5dcc42 VK |
230 | static ssize_t store_up_threshold(struct dbs_data *dbs_data, const char *buf, |
231 | size_t count) | |
1da177e4 LT |
232 | { |
233 | unsigned int input; | |
234 | int ret; | |
ffac80e9 | 235 | ret = sscanf(buf, "%u", &input); |
1da177e4 | 236 | |
32ee8c3e | 237 | if (ret != 1 || input > MAX_FREQUENCY_UP_THRESHOLD || |
c29f1403 | 238 | input < MIN_FREQUENCY_UP_THRESHOLD) { |
1da177e4 LT |
239 | return -EINVAL; |
240 | } | |
4bd4e428 | 241 | |
ff4b1789 | 242 | dbs_data->up_threshold = input; |
1da177e4 LT |
243 | return count; |
244 | } | |
245 | ||
4d5dcc42 VK |
246 | static ssize_t store_sampling_down_factor(struct dbs_data *dbs_data, |
247 | const char *buf, size_t count) | |
3f78a9f7 | 248 | { |
57dc3bcd RW |
249 | struct policy_dbs_info *policy_dbs; |
250 | unsigned int input; | |
3f78a9f7 DN |
251 | int ret; |
252 | ret = sscanf(buf, "%u", &input); | |
253 | ||
254 | if (ret != 1 || input > MAX_SAMPLING_DOWN_FACTOR || input < 1) | |
255 | return -EINVAL; | |
57dc3bcd | 256 | |
ff4b1789 | 257 | dbs_data->sampling_down_factor = input; |
3f78a9f7 DN |
258 | |
259 | /* Reset down sampling multiplier in case it was active */ | |
57dc3bcd RW |
260 | list_for_each_entry(policy_dbs, &dbs_data->policy_dbs_list, list) { |
261 | /* | |
262 | * Doing this without locking might lead to using different | |
263 | * rate_mult values in od_update() and od_dbs_timer(). | |
264 | */ | |
265 | mutex_lock(&policy_dbs->timer_mutex); | |
266 | policy_dbs->rate_mult = 1; | |
267 | mutex_unlock(&policy_dbs->timer_mutex); | |
3f78a9f7 | 268 | } |
57dc3bcd | 269 | |
3f78a9f7 DN |
270 | return count; |
271 | } | |
272 | ||
6c4640c3 VK |
273 | static ssize_t store_ignore_nice_load(struct dbs_data *dbs_data, |
274 | const char *buf, size_t count) | |
3d5ee9e5 DJ |
275 | { |
276 | unsigned int input; | |
277 | int ret; | |
278 | ||
ffac80e9 | 279 | ret = sscanf(buf, "%u", &input); |
2b03f891 | 280 | if (ret != 1) |
3d5ee9e5 DJ |
281 | return -EINVAL; |
282 | ||
2b03f891 | 283 | if (input > 1) |
3d5ee9e5 | 284 | input = 1; |
32ee8c3e | 285 | |
ff4b1789 | 286 | if (input == dbs_data->ignore_nice_load) { /* nothing to do */ |
3d5ee9e5 DJ |
287 | return count; |
288 | } | |
ff4b1789 | 289 | dbs_data->ignore_nice_load = input; |
3d5ee9e5 | 290 | |
ccb2fe20 | 291 | /* we need to re-evaluate prev_cpu_idle */ |
a33cce1c | 292 | gov_update_cpu_data(&od_dbs_gov, dbs_data); |
1ca3abdb | 293 | |
3d5ee9e5 DJ |
294 | return count; |
295 | } | |
296 | ||
4d5dcc42 VK |
297 | static ssize_t store_powersave_bias(struct dbs_data *dbs_data, const char *buf, |
298 | size_t count) | |
05ca0350 | 299 | { |
4d5dcc42 | 300 | struct od_dbs_tuners *od_tuners = dbs_data->tuners; |
d1db75ff | 301 | struct policy_dbs_info *policy_dbs; |
05ca0350 AS |
302 | unsigned int input; |
303 | int ret; | |
304 | ret = sscanf(buf, "%u", &input); | |
305 | ||
306 | if (ret != 1) | |
307 | return -EINVAL; | |
308 | ||
309 | if (input > 1000) | |
310 | input = 1000; | |
311 | ||
4d5dcc42 | 312 | od_tuners->powersave_bias = input; |
d1db75ff RW |
313 | |
314 | list_for_each_entry(policy_dbs, &dbs_data->policy_dbs_list, list) | |
315 | ondemand_powersave_bias_init(policy_dbs->policy); | |
316 | ||
05ca0350 AS |
317 | return count; |
318 | } | |
319 | ||
c4435630 VK |
320 | gov_show_one_common(sampling_rate); |
321 | gov_show_one_common(up_threshold); | |
322 | gov_show_one_common(sampling_down_factor); | |
323 | gov_show_one_common(ignore_nice_load); | |
324 | gov_show_one_common(min_sampling_rate); | |
8847e038 | 325 | gov_show_one_common(io_is_busy); |
c4435630 VK |
326 | gov_show_one(od, powersave_bias); |
327 | ||
328 | gov_attr_rw(sampling_rate); | |
329 | gov_attr_rw(io_is_busy); | |
330 | gov_attr_rw(up_threshold); | |
331 | gov_attr_rw(sampling_down_factor); | |
332 | gov_attr_rw(ignore_nice_load); | |
333 | gov_attr_rw(powersave_bias); | |
334 | gov_attr_ro(min_sampling_rate); | |
335 | ||
336 | static struct attribute *od_attributes[] = { | |
337 | &min_sampling_rate.attr, | |
338 | &sampling_rate.attr, | |
339 | &up_threshold.attr, | |
340 | &sampling_down_factor.attr, | |
341 | &ignore_nice_load.attr, | |
342 | &powersave_bias.attr, | |
343 | &io_is_busy.attr, | |
1da177e4 LT |
344 | NULL |
345 | }; | |
346 | ||
1da177e4 LT |
347 | /************************** sysfs end ************************/ |
348 | ||
7d5a9956 RW |
349 | static struct policy_dbs_info *od_alloc(void) |
350 | { | |
351 | struct od_policy_dbs_info *dbs_info; | |
352 | ||
353 | dbs_info = kzalloc(sizeof(*dbs_info), GFP_KERNEL); | |
354 | return dbs_info ? &dbs_info->policy_dbs : NULL; | |
355 | } | |
356 | ||
357 | static void od_free(struct policy_dbs_info *policy_dbs) | |
358 | { | |
359 | kfree(to_dbs_info(policy_dbs)); | |
360 | } | |
361 | ||
8e0484d2 | 362 | static int od_init(struct dbs_data *dbs_data, bool notify) |
4d5dcc42 VK |
363 | { |
364 | struct od_dbs_tuners *tuners; | |
365 | u64 idle_time; | |
366 | int cpu; | |
367 | ||
d5b73cd8 | 368 | tuners = kzalloc(sizeof(*tuners), GFP_KERNEL); |
4d5dcc42 VK |
369 | if (!tuners) { |
370 | pr_err("%s: kzalloc failed\n", __func__); | |
371 | return -ENOMEM; | |
372 | } | |
373 | ||
374 | cpu = get_cpu(); | |
375 | idle_time = get_cpu_idle_time_us(cpu, NULL); | |
376 | put_cpu(); | |
377 | if (idle_time != -1ULL) { | |
378 | /* Idle micro accounting is supported. Use finer thresholds */ | |
ff4b1789 | 379 | dbs_data->up_threshold = MICRO_FREQUENCY_UP_THRESHOLD; |
4d5dcc42 VK |
380 | /* |
381 | * In nohz/micro accounting case we set the minimum frequency | |
382 | * not depending on HZ, but fixed (very low). The deferred | |
383 | * timer might skip some samples if idle/sleeping as needed. | |
384 | */ | |
385 | dbs_data->min_sampling_rate = MICRO_FREQUENCY_MIN_SAMPLE_RATE; | |
386 | } else { | |
ff4b1789 | 387 | dbs_data->up_threshold = DEF_FREQUENCY_UP_THRESHOLD; |
4d5dcc42 VK |
388 | |
389 | /* For correct statistics, we need 10 ticks for each measure */ | |
390 | dbs_data->min_sampling_rate = MIN_SAMPLING_RATE_RATIO * | |
391 | jiffies_to_usecs(10); | |
392 | } | |
393 | ||
ff4b1789 VK |
394 | dbs_data->sampling_down_factor = DEF_SAMPLING_DOWN_FACTOR; |
395 | dbs_data->ignore_nice_load = 0; | |
c2837558 | 396 | tuners->powersave_bias = default_powersave_bias; |
8847e038 | 397 | dbs_data->io_is_busy = should_io_be_busy(); |
4d5dcc42 VK |
398 | |
399 | dbs_data->tuners = tuners; | |
4d5dcc42 VK |
400 | return 0; |
401 | } | |
402 | ||
8e0484d2 | 403 | static void od_exit(struct dbs_data *dbs_data, bool notify) |
4d5dcc42 VK |
404 | { |
405 | kfree(dbs_data->tuners); | |
406 | } | |
407 | ||
702c9e54 RW |
408 | static void od_start(struct cpufreq_policy *policy) |
409 | { | |
7d5a9956 | 410 | struct od_policy_dbs_info *dbs_info = to_dbs_info(policy->governor_data); |
702c9e54 RW |
411 | |
412 | dbs_info->sample_type = OD_NORMAL_SAMPLE; | |
d1db75ff | 413 | ondemand_powersave_bias_init(policy); |
702c9e54 RW |
414 | } |
415 | ||
4471a34f | 416 | define_get_cpu_dbs_routines(od_cpu_dbs_info); |
6b8fcd90 | 417 | |
4471a34f | 418 | static struct od_ops od_ops = { |
fb30809e | 419 | .powersave_bias_target = generic_powersave_bias_target, |
4471a34f | 420 | }; |
2f8a835c | 421 | |
7bdad34d | 422 | static struct dbs_governor od_dbs_gov = { |
af926185 RW |
423 | .gov = { |
424 | .name = "ondemand", | |
906a6e5a | 425 | .governor = cpufreq_governor_dbs, |
af926185 RW |
426 | .max_transition_latency = TRANSITION_LATENCY_LIMIT, |
427 | .owner = THIS_MODULE, | |
428 | }, | |
c4435630 | 429 | .kobj_type = { .default_attrs = od_attributes }, |
4471a34f | 430 | .get_cpu_cdbs = get_cpu_cdbs, |
4471a34f | 431 | .gov_dbs_timer = od_dbs_timer, |
7d5a9956 RW |
432 | .alloc = od_alloc, |
433 | .free = od_free, | |
4d5dcc42 VK |
434 | .init = od_init, |
435 | .exit = od_exit, | |
702c9e54 | 436 | .start = od_start, |
4471a34f | 437 | }; |
1da177e4 | 438 | |
7bdad34d | 439 | #define CPU_FREQ_GOV_ONDEMAND (&od_dbs_gov.gov) |
af926185 | 440 | |
fb30809e JS |
441 | static void od_set_powersave_bias(unsigned int powersave_bias) |
442 | { | |
443 | struct cpufreq_policy *policy; | |
444 | struct dbs_data *dbs_data; | |
445 | struct od_dbs_tuners *od_tuners; | |
446 | unsigned int cpu; | |
447 | cpumask_t done; | |
448 | ||
c2837558 | 449 | default_powersave_bias = powersave_bias; |
fb30809e JS |
450 | cpumask_clear(&done); |
451 | ||
452 | get_online_cpus(); | |
453 | for_each_online_cpu(cpu) { | |
e40e7b25 | 454 | struct policy_dbs_info *policy_dbs; |
44152cb8 | 455 | |
fb30809e JS |
456 | if (cpumask_test_cpu(cpu, &done)) |
457 | continue; | |
458 | ||
e40e7b25 RW |
459 | policy_dbs = per_cpu(od_cpu_dbs_info, cpu).cdbs.policy_dbs; |
460 | if (!policy_dbs) | |
c2837558 | 461 | continue; |
fb30809e | 462 | |
e40e7b25 | 463 | policy = policy_dbs->policy; |
fb30809e | 464 | cpumask_or(&done, &done, policy->cpus); |
c2837558 | 465 | |
af926185 | 466 | if (policy->governor != CPU_FREQ_GOV_ONDEMAND) |
c2837558 JS |
467 | continue; |
468 | ||
bc505475 | 469 | dbs_data = policy_dbs->dbs_data; |
c2837558 JS |
470 | od_tuners = dbs_data->tuners; |
471 | od_tuners->powersave_bias = default_powersave_bias; | |
fb30809e JS |
472 | } |
473 | put_online_cpus(); | |
474 | } | |
475 | ||
476 | void od_register_powersave_bias_handler(unsigned int (*f) | |
477 | (struct cpufreq_policy *, unsigned int, unsigned int), | |
478 | unsigned int powersave_bias) | |
479 | { | |
480 | od_ops.powersave_bias_target = f; | |
481 | od_set_powersave_bias(powersave_bias); | |
482 | } | |
483 | EXPORT_SYMBOL_GPL(od_register_powersave_bias_handler); | |
484 | ||
485 | void od_unregister_powersave_bias_handler(void) | |
486 | { | |
487 | od_ops.powersave_bias_target = generic_powersave_bias_target; | |
488 | od_set_powersave_bias(0); | |
489 | } | |
490 | EXPORT_SYMBOL_GPL(od_unregister_powersave_bias_handler); | |
491 | ||
1da177e4 LT |
492 | static int __init cpufreq_gov_dbs_init(void) |
493 | { | |
af926185 | 494 | return cpufreq_register_governor(CPU_FREQ_GOV_ONDEMAND); |
1da177e4 LT |
495 | } |
496 | ||
497 | static void __exit cpufreq_gov_dbs_exit(void) | |
498 | { | |
af926185 | 499 | cpufreq_unregister_governor(CPU_FREQ_GOV_ONDEMAND); |
1da177e4 LT |
500 | } |
501 | ||
ffac80e9 VP |
502 | MODULE_AUTHOR("Venkatesh Pallipadi <venkatesh.pallipadi@intel.com>"); |
503 | MODULE_AUTHOR("Alexey Starikovskiy <alexey.y.starikovskiy@intel.com>"); | |
504 | MODULE_DESCRIPTION("'cpufreq_ondemand' - A dynamic cpufreq governor for " | |
2b03f891 | 505 | "Low Latency Frequency Transition capable processors"); |
ffac80e9 | 506 | MODULE_LICENSE("GPL"); |
1da177e4 | 507 | |
6915719b | 508 | #ifdef CONFIG_CPU_FREQ_DEFAULT_GOV_ONDEMAND |
de1df26b RW |
509 | struct cpufreq_governor *cpufreq_default_governor(void) |
510 | { | |
af926185 | 511 | return CPU_FREQ_GOV_ONDEMAND; |
de1df26b RW |
512 | } |
513 | ||
6915719b JW |
514 | fs_initcall(cpufreq_gov_dbs_init); |
515 | #else | |
1da177e4 | 516 | module_init(cpufreq_gov_dbs_init); |
6915719b | 517 | #endif |
1da177e4 | 518 | module_exit(cpufreq_gov_dbs_exit); |