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 | ||
c2837558 JS |
34 | static unsigned int default_powersave_bias; |
35 | ||
4471a34f | 36 | static void ondemand_powersave_bias_init_cpu(int cpu) |
6b8fcd90 | 37 | { |
4471a34f | 38 | struct od_cpu_dbs_info_s *dbs_info = &per_cpu(od_cpu_dbs_info, cpu); |
6b8fcd90 | 39 | |
4471a34f VK |
40 | dbs_info->freq_table = cpufreq_frequency_get_table(cpu); |
41 | dbs_info->freq_lo = 0; | |
42 | } | |
6b8fcd90 | 43 | |
4471a34f VK |
44 | /* |
45 | * Not all CPUs want IO time to be accounted as busy; this depends on how | |
46 | * efficient idling at a higher frequency/voltage is. | |
47 | * Pavel Machek says this is not so for various generations of AMD and old | |
48 | * Intel systems. | |
06eb09d1 | 49 | * Mike Chan (android.com) claims this is also not true for ARM. |
4471a34f VK |
50 | * Because of this, whitelist specific known (series) of CPUs by default, and |
51 | * leave all others up to the user. | |
52 | */ | |
53 | static int should_io_be_busy(void) | |
54 | { | |
55 | #if defined(CONFIG_X86) | |
56 | /* | |
06eb09d1 | 57 | * For Intel, Core 2 (model 15) and later have an efficient idle. |
4471a34f VK |
58 | */ |
59 | if (boot_cpu_data.x86_vendor == X86_VENDOR_INTEL && | |
60 | boot_cpu_data.x86 == 6 && | |
61 | boot_cpu_data.x86_model >= 15) | |
62 | return 1; | |
63 | #endif | |
64 | return 0; | |
6b8fcd90 AV |
65 | } |
66 | ||
05ca0350 AS |
67 | /* |
68 | * Find right freq to be set now with powersave_bias on. | |
07aa4402 RW |
69 | * Returns the freq_hi to be used right now and will set freq_hi_delay_us, |
70 | * freq_lo, and freq_lo_delay_us in percpu area for averaging freqs. | |
05ca0350 | 71 | */ |
fb30809e | 72 | static unsigned int generic_powersave_bias_target(struct cpufreq_policy *policy, |
4471a34f | 73 | unsigned int freq_next, unsigned int relation) |
05ca0350 AS |
74 | { |
75 | unsigned int freq_req, freq_reduc, freq_avg; | |
76 | unsigned int freq_hi, freq_lo; | |
77 | unsigned int index = 0; | |
07aa4402 | 78 | unsigned int delay_hi_us; |
4471a34f | 79 | struct od_cpu_dbs_info_s *dbs_info = &per_cpu(od_cpu_dbs_info, |
245b2e70 | 80 | policy->cpu); |
bc505475 RW |
81 | struct policy_dbs_info *policy_dbs = policy->governor_data; |
82 | struct dbs_data *dbs_data = policy_dbs->dbs_data; | |
4d5dcc42 | 83 | struct od_dbs_tuners *od_tuners = dbs_data->tuners; |
05ca0350 AS |
84 | |
85 | if (!dbs_info->freq_table) { | |
86 | dbs_info->freq_lo = 0; | |
07aa4402 | 87 | dbs_info->freq_lo_delay_us = 0; |
05ca0350 AS |
88 | return freq_next; |
89 | } | |
90 | ||
91 | cpufreq_frequency_table_target(policy, dbs_info->freq_table, freq_next, | |
92 | relation, &index); | |
93 | freq_req = dbs_info->freq_table[index].frequency; | |
4d5dcc42 | 94 | freq_reduc = freq_req * od_tuners->powersave_bias / 1000; |
05ca0350 AS |
95 | freq_avg = freq_req - freq_reduc; |
96 | ||
97 | /* Find freq bounds for freq_avg in freq_table */ | |
98 | index = 0; | |
99 | cpufreq_frequency_table_target(policy, dbs_info->freq_table, freq_avg, | |
100 | CPUFREQ_RELATION_H, &index); | |
101 | freq_lo = dbs_info->freq_table[index].frequency; | |
102 | index = 0; | |
103 | cpufreq_frequency_table_target(policy, dbs_info->freq_table, freq_avg, | |
104 | CPUFREQ_RELATION_L, &index); | |
105 | freq_hi = dbs_info->freq_table[index].frequency; | |
106 | ||
107 | /* Find out how long we have to be in hi and lo freqs */ | |
108 | if (freq_hi == freq_lo) { | |
109 | dbs_info->freq_lo = 0; | |
07aa4402 | 110 | dbs_info->freq_lo_delay_us = 0; |
05ca0350 AS |
111 | return freq_lo; |
112 | } | |
07aa4402 RW |
113 | delay_hi_us = (freq_avg - freq_lo) * dbs_data->sampling_rate; |
114 | delay_hi_us += (freq_hi - freq_lo) / 2; | |
115 | delay_hi_us /= freq_hi - freq_lo; | |
116 | dbs_info->freq_hi_delay_us = delay_hi_us; | |
05ca0350 | 117 | dbs_info->freq_lo = freq_lo; |
07aa4402 | 118 | dbs_info->freq_lo_delay_us = dbs_data->sampling_rate - delay_hi_us; |
05ca0350 AS |
119 | return freq_hi; |
120 | } | |
121 | ||
122 | static void ondemand_powersave_bias_init(void) | |
123 | { | |
124 | int i; | |
125 | for_each_online_cpu(i) { | |
5a75c828 | 126 | ondemand_powersave_bias_init_cpu(i); |
05ca0350 AS |
127 | } |
128 | } | |
129 | ||
3a3e9e06 | 130 | static void dbs_freq_increase(struct cpufreq_policy *policy, unsigned int freq) |
4471a34f | 131 | { |
bc505475 RW |
132 | struct policy_dbs_info *policy_dbs = policy->governor_data; |
133 | struct dbs_data *dbs_data = policy_dbs->dbs_data; | |
4d5dcc42 VK |
134 | struct od_dbs_tuners *od_tuners = dbs_data->tuners; |
135 | ||
136 | if (od_tuners->powersave_bias) | |
3a3e9e06 | 137 | freq = od_ops.powersave_bias_target(policy, freq, |
fb30809e | 138 | CPUFREQ_RELATION_H); |
3a3e9e06 | 139 | else if (policy->cur == policy->max) |
4471a34f | 140 | return; |
0e625ac1 | 141 | |
3a3e9e06 | 142 | __cpufreq_driver_target(policy, freq, od_tuners->powersave_bias ? |
4471a34f VK |
143 | CPUFREQ_RELATION_L : CPUFREQ_RELATION_H); |
144 | } | |
145 | ||
146 | /* | |
147 | * Every sampling_rate, we check, if current idle time is less than 20% | |
dfa5bb62 SK |
148 | * (default), then we try to increase frequency. Else, we adjust the frequency |
149 | * proportional to load. | |
4471a34f | 150 | */ |
4cccf755 | 151 | static void od_update(struct cpufreq_policy *policy) |
1da177e4 | 152 | { |
4cccf755 | 153 | struct od_cpu_dbs_info_s *dbs_info = &per_cpu(od_cpu_dbs_info, policy->cpu); |
bc505475 | 154 | struct policy_dbs_info *policy_dbs = dbs_info->cdbs.policy_dbs; |
bc505475 | 155 | struct dbs_data *dbs_data = policy_dbs->dbs_data; |
4d5dcc42 | 156 | struct od_dbs_tuners *od_tuners = dbs_data->tuners; |
4cccf755 | 157 | unsigned int load = dbs_update(policy); |
4471a34f VK |
158 | |
159 | dbs_info->freq_lo = 0; | |
160 | ||
161 | /* Check for frequency increase */ | |
ff4b1789 | 162 | if (load > dbs_data->up_threshold) { |
4471a34f VK |
163 | /* If switching to max speed, apply sampling_down_factor */ |
164 | if (policy->cur < policy->max) | |
57dc3bcd | 165 | policy_dbs->rate_mult = dbs_data->sampling_down_factor; |
4471a34f | 166 | dbs_freq_increase(policy, policy->max); |
dfa5bb62 SK |
167 | } else { |
168 | /* Calculate the next frequency proportional to load */ | |
6393d6a1 SK |
169 | unsigned int freq_next, min_f, max_f; |
170 | ||
171 | min_f = policy->cpuinfo.min_freq; | |
172 | max_f = policy->cpuinfo.max_freq; | |
173 | freq_next = min_f + load * (max_f - min_f) / 100; | |
4471a34f VK |
174 | |
175 | /* No longer fully busy, reset rate_mult */ | |
57dc3bcd | 176 | policy_dbs->rate_mult = 1; |
4471a34f | 177 | |
a7f35cff RW |
178 | if (od_tuners->powersave_bias) |
179 | freq_next = od_ops.powersave_bias_target(policy, | |
180 | freq_next, | |
181 | CPUFREQ_RELATION_L); | |
182 | ||
6393d6a1 | 183 | __cpufreq_driver_target(policy, freq_next, CPUFREQ_RELATION_C); |
4471a34f | 184 | } |
1da177e4 LT |
185 | } |
186 | ||
9be4fd2c | 187 | static unsigned int od_dbs_timer(struct cpufreq_policy *policy) |
4471a34f | 188 | { |
bc505475 RW |
189 | struct policy_dbs_info *policy_dbs = policy->governor_data; |
190 | struct dbs_data *dbs_data = policy_dbs->dbs_data; | |
d10b5eb5 | 191 | struct od_cpu_dbs_info_s *dbs_info = &per_cpu(od_cpu_dbs_info, policy->cpu); |
6e96c5b3 | 192 | int sample_type = dbs_info->sample_type; |
4447266b | 193 | |
4471a34f | 194 | /* Common NORMAL_SAMPLE setup */ |
43e0ee36 | 195 | dbs_info->sample_type = OD_NORMAL_SAMPLE; |
4cccf755 RW |
196 | /* |
197 | * OD_SUB_SAMPLE doesn't make sense if sample_delay_ns is 0, so ignore | |
198 | * it then. | |
199 | */ | |
200 | if (sample_type == OD_SUB_SAMPLE && policy_dbs->sample_delay_ns > 0) { | |
43e0ee36 | 201 | __cpufreq_driver_target(policy, dbs_info->freq_lo, |
42994af6 | 202 | CPUFREQ_RELATION_H); |
07aa4402 | 203 | return dbs_info->freq_lo_delay_us; |
6e96c5b3 RW |
204 | } |
205 | ||
206 | od_update(policy); | |
207 | ||
208 | if (dbs_info->freq_lo) { | |
209 | /* Setup timer for SUB_SAMPLE */ | |
210 | dbs_info->sample_type = OD_SUB_SAMPLE; | |
07aa4402 | 211 | return dbs_info->freq_hi_delay_us; |
4471a34f VK |
212 | } |
213 | ||
07aa4402 | 214 | return dbs_data->sampling_rate * policy_dbs->rate_mult; |
da53d61e FB |
215 | } |
216 | ||
4471a34f | 217 | /************************** sysfs interface ************************/ |
7bdad34d | 218 | static struct dbs_governor od_dbs_gov; |
1da177e4 | 219 | |
4d5dcc42 VK |
220 | static ssize_t store_io_is_busy(struct dbs_data *dbs_data, const char *buf, |
221 | size_t count) | |
19379b11 | 222 | { |
4d5dcc42 | 223 | struct od_dbs_tuners *od_tuners = dbs_data->tuners; |
19379b11 AV |
224 | unsigned int input; |
225 | int ret; | |
9366d840 | 226 | unsigned int j; |
19379b11 AV |
227 | |
228 | ret = sscanf(buf, "%u", &input); | |
229 | if (ret != 1) | |
230 | return -EINVAL; | |
4d5dcc42 | 231 | od_tuners->io_is_busy = !!input; |
9366d840 SK |
232 | |
233 | /* we need to re-evaluate prev_cpu_idle */ | |
234 | for_each_online_cpu(j) { | |
235 | struct od_cpu_dbs_info_s *dbs_info = &per_cpu(od_cpu_dbs_info, | |
236 | j); | |
237 | dbs_info->cdbs.prev_cpu_idle = get_cpu_idle_time(j, | |
238 | &dbs_info->cdbs.prev_cpu_wall, od_tuners->io_is_busy); | |
239 | } | |
19379b11 AV |
240 | return count; |
241 | } | |
242 | ||
4d5dcc42 VK |
243 | static ssize_t store_up_threshold(struct dbs_data *dbs_data, const char *buf, |
244 | size_t count) | |
1da177e4 LT |
245 | { |
246 | unsigned int input; | |
247 | int ret; | |
ffac80e9 | 248 | ret = sscanf(buf, "%u", &input); |
1da177e4 | 249 | |
32ee8c3e | 250 | if (ret != 1 || input > MAX_FREQUENCY_UP_THRESHOLD || |
c29f1403 | 251 | input < MIN_FREQUENCY_UP_THRESHOLD) { |
1da177e4 LT |
252 | return -EINVAL; |
253 | } | |
4bd4e428 | 254 | |
ff4b1789 | 255 | dbs_data->up_threshold = input; |
1da177e4 LT |
256 | return count; |
257 | } | |
258 | ||
4d5dcc42 VK |
259 | static ssize_t store_sampling_down_factor(struct dbs_data *dbs_data, |
260 | const char *buf, size_t count) | |
3f78a9f7 | 261 | { |
57dc3bcd RW |
262 | struct policy_dbs_info *policy_dbs; |
263 | unsigned int input; | |
3f78a9f7 DN |
264 | int ret; |
265 | ret = sscanf(buf, "%u", &input); | |
266 | ||
267 | if (ret != 1 || input > MAX_SAMPLING_DOWN_FACTOR || input < 1) | |
268 | return -EINVAL; | |
57dc3bcd | 269 | |
ff4b1789 | 270 | dbs_data->sampling_down_factor = input; |
3f78a9f7 DN |
271 | |
272 | /* Reset down sampling multiplier in case it was active */ | |
57dc3bcd RW |
273 | list_for_each_entry(policy_dbs, &dbs_data->policy_dbs_list, list) { |
274 | /* | |
275 | * Doing this without locking might lead to using different | |
276 | * rate_mult values in od_update() and od_dbs_timer(). | |
277 | */ | |
278 | mutex_lock(&policy_dbs->timer_mutex); | |
279 | policy_dbs->rate_mult = 1; | |
280 | mutex_unlock(&policy_dbs->timer_mutex); | |
3f78a9f7 | 281 | } |
57dc3bcd | 282 | |
3f78a9f7 DN |
283 | return count; |
284 | } | |
285 | ||
6c4640c3 VK |
286 | static ssize_t store_ignore_nice_load(struct dbs_data *dbs_data, |
287 | const char *buf, size_t count) | |
3d5ee9e5 | 288 | { |
4d5dcc42 | 289 | struct od_dbs_tuners *od_tuners = dbs_data->tuners; |
3d5ee9e5 DJ |
290 | unsigned int input; |
291 | int ret; | |
292 | ||
293 | unsigned int j; | |
32ee8c3e | 294 | |
ffac80e9 | 295 | ret = sscanf(buf, "%u", &input); |
2b03f891 | 296 | if (ret != 1) |
3d5ee9e5 DJ |
297 | return -EINVAL; |
298 | ||
2b03f891 | 299 | if (input > 1) |
3d5ee9e5 | 300 | input = 1; |
32ee8c3e | 301 | |
ff4b1789 | 302 | if (input == dbs_data->ignore_nice_load) { /* nothing to do */ |
3d5ee9e5 DJ |
303 | return count; |
304 | } | |
ff4b1789 | 305 | dbs_data->ignore_nice_load = input; |
3d5ee9e5 | 306 | |
ccb2fe20 | 307 | /* we need to re-evaluate prev_cpu_idle */ |
dac1c1a5 | 308 | for_each_online_cpu(j) { |
4471a34f | 309 | struct od_cpu_dbs_info_s *dbs_info; |
245b2e70 | 310 | dbs_info = &per_cpu(od_cpu_dbs_info, j); |
4471a34f | 311 | dbs_info->cdbs.prev_cpu_idle = get_cpu_idle_time(j, |
9366d840 | 312 | &dbs_info->cdbs.prev_cpu_wall, od_tuners->io_is_busy); |
ff4b1789 | 313 | if (dbs_data->ignore_nice_load) |
4471a34f VK |
314 | dbs_info->cdbs.prev_cpu_nice = |
315 | kcpustat_cpu(j).cpustat[CPUTIME_NICE]; | |
1ca3abdb | 316 | |
3d5ee9e5 | 317 | } |
3d5ee9e5 DJ |
318 | return count; |
319 | } | |
320 | ||
4d5dcc42 VK |
321 | static ssize_t store_powersave_bias(struct dbs_data *dbs_data, const char *buf, |
322 | size_t count) | |
05ca0350 | 323 | { |
4d5dcc42 | 324 | struct od_dbs_tuners *od_tuners = dbs_data->tuners; |
05ca0350 AS |
325 | unsigned int input; |
326 | int ret; | |
327 | ret = sscanf(buf, "%u", &input); | |
328 | ||
329 | if (ret != 1) | |
330 | return -EINVAL; | |
331 | ||
332 | if (input > 1000) | |
333 | input = 1000; | |
334 | ||
4d5dcc42 | 335 | od_tuners->powersave_bias = input; |
05ca0350 | 336 | ondemand_powersave_bias_init(); |
05ca0350 AS |
337 | return count; |
338 | } | |
339 | ||
c4435630 VK |
340 | gov_show_one_common(sampling_rate); |
341 | gov_show_one_common(up_threshold); | |
342 | gov_show_one_common(sampling_down_factor); | |
343 | gov_show_one_common(ignore_nice_load); | |
344 | gov_show_one_common(min_sampling_rate); | |
345 | gov_show_one(od, io_is_busy); | |
346 | gov_show_one(od, powersave_bias); | |
347 | ||
348 | gov_attr_rw(sampling_rate); | |
349 | gov_attr_rw(io_is_busy); | |
350 | gov_attr_rw(up_threshold); | |
351 | gov_attr_rw(sampling_down_factor); | |
352 | gov_attr_rw(ignore_nice_load); | |
353 | gov_attr_rw(powersave_bias); | |
354 | gov_attr_ro(min_sampling_rate); | |
355 | ||
356 | static struct attribute *od_attributes[] = { | |
357 | &min_sampling_rate.attr, | |
358 | &sampling_rate.attr, | |
359 | &up_threshold.attr, | |
360 | &sampling_down_factor.attr, | |
361 | &ignore_nice_load.attr, | |
362 | &powersave_bias.attr, | |
363 | &io_is_busy.attr, | |
1da177e4 LT |
364 | NULL |
365 | }; | |
366 | ||
1da177e4 LT |
367 | /************************** sysfs end ************************/ |
368 | ||
8e0484d2 | 369 | static int od_init(struct dbs_data *dbs_data, bool notify) |
4d5dcc42 VK |
370 | { |
371 | struct od_dbs_tuners *tuners; | |
372 | u64 idle_time; | |
373 | int cpu; | |
374 | ||
d5b73cd8 | 375 | tuners = kzalloc(sizeof(*tuners), GFP_KERNEL); |
4d5dcc42 VK |
376 | if (!tuners) { |
377 | pr_err("%s: kzalloc failed\n", __func__); | |
378 | return -ENOMEM; | |
379 | } | |
380 | ||
381 | cpu = get_cpu(); | |
382 | idle_time = get_cpu_idle_time_us(cpu, NULL); | |
383 | put_cpu(); | |
384 | if (idle_time != -1ULL) { | |
385 | /* Idle micro accounting is supported. Use finer thresholds */ | |
ff4b1789 | 386 | dbs_data->up_threshold = MICRO_FREQUENCY_UP_THRESHOLD; |
4d5dcc42 VK |
387 | /* |
388 | * In nohz/micro accounting case we set the minimum frequency | |
389 | * not depending on HZ, but fixed (very low). The deferred | |
390 | * timer might skip some samples if idle/sleeping as needed. | |
391 | */ | |
392 | dbs_data->min_sampling_rate = MICRO_FREQUENCY_MIN_SAMPLE_RATE; | |
393 | } else { | |
ff4b1789 | 394 | dbs_data->up_threshold = DEF_FREQUENCY_UP_THRESHOLD; |
4d5dcc42 VK |
395 | |
396 | /* For correct statistics, we need 10 ticks for each measure */ | |
397 | dbs_data->min_sampling_rate = MIN_SAMPLING_RATE_RATIO * | |
398 | jiffies_to_usecs(10); | |
399 | } | |
400 | ||
ff4b1789 VK |
401 | dbs_data->sampling_down_factor = DEF_SAMPLING_DOWN_FACTOR; |
402 | dbs_data->ignore_nice_load = 0; | |
c2837558 | 403 | tuners->powersave_bias = default_powersave_bias; |
4d5dcc42 VK |
404 | tuners->io_is_busy = should_io_be_busy(); |
405 | ||
406 | dbs_data->tuners = tuners; | |
4d5dcc42 VK |
407 | return 0; |
408 | } | |
409 | ||
8e0484d2 | 410 | static void od_exit(struct dbs_data *dbs_data, bool notify) |
4d5dcc42 VK |
411 | { |
412 | kfree(dbs_data->tuners); | |
413 | } | |
414 | ||
4471a34f | 415 | define_get_cpu_dbs_routines(od_cpu_dbs_info); |
6b8fcd90 | 416 | |
4471a34f | 417 | static struct od_ops od_ops = { |
4471a34f | 418 | .powersave_bias_init_cpu = ondemand_powersave_bias_init_cpu, |
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 | }, | |
4471a34f | 429 | .governor = GOV_ONDEMAND, |
c4435630 | 430 | .kobj_type = { .default_attrs = od_attributes }, |
4471a34f VK |
431 | .get_cpu_cdbs = get_cpu_cdbs, |
432 | .get_cpu_dbs_info_s = get_cpu_dbs_info_s, | |
433 | .gov_dbs_timer = od_dbs_timer, | |
4471a34f | 434 | .gov_ops = &od_ops, |
4d5dcc42 VK |
435 | .init = od_init, |
436 | .exit = od_exit, | |
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); |