Commit | Line | Data |
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d2912cb1 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
1da177e4 LT |
2 | /* |
3 | * drivers/cpufreq/cpufreq_ondemand.c | |
4 | * | |
5 | * Copyright (C) 2001 Russell King | |
6 | * (C) 2003 Venkatesh Pallipadi <venkatesh.pallipadi@intel.com>. | |
7 | * Jun Nakajima <jun.nakajima@intel.com> | |
1da177e4 LT |
8 | */ |
9 | ||
4471a34f VK |
10 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
11 | ||
5ff0a268 | 12 | #include <linux/cpu.h> |
4471a34f | 13 | #include <linux/percpu-defs.h> |
4d5dcc42 | 14 | #include <linux/slab.h> |
80800913 | 15 | #include <linux/tick.h> |
55687da1 | 16 | #include <linux/sched/cpufreq.h> |
7d5a9956 RW |
17 | |
18 | #include "cpufreq_ondemand.h" | |
1da177e4 | 19 | |
06eb09d1 | 20 | /* On-demand governor macros */ |
1da177e4 | 21 | #define DEF_FREQUENCY_UP_THRESHOLD (80) |
3f78a9f7 DN |
22 | #define DEF_SAMPLING_DOWN_FACTOR (1) |
23 | #define MAX_SAMPLING_DOWN_FACTOR (100000) | |
80800913 | 24 | #define MICRO_FREQUENCY_UP_THRESHOLD (95) |
4dd63b49 | 25 | #define MIN_FREQUENCY_UP_THRESHOLD (1) |
1da177e4 LT |
26 | #define MAX_FREQUENCY_UP_THRESHOLD (100) |
27 | ||
fb30809e JS |
28 | static struct od_ops od_ops; |
29 | ||
c2837558 JS |
30 | static unsigned int default_powersave_bias; |
31 | ||
4471a34f VK |
32 | /* |
33 | * Not all CPUs want IO time to be accounted as busy; this depends on how | |
34 | * efficient idling at a higher frequency/voltage is. | |
35 | * Pavel Machek says this is not so for various generations of AMD and old | |
36 | * Intel systems. | |
06eb09d1 | 37 | * Mike Chan (android.com) claims this is also not true for ARM. |
4471a34f VK |
38 | * Because of this, whitelist specific known (series) of CPUs by default, and |
39 | * leave all others up to the user. | |
40 | */ | |
41 | static int should_io_be_busy(void) | |
42 | { | |
43 | #if defined(CONFIG_X86) | |
44 | /* | |
06eb09d1 | 45 | * For Intel, Core 2 (model 15) and later have an efficient idle. |
4471a34f VK |
46 | */ |
47 | if (boot_cpu_data.x86_vendor == X86_VENDOR_INTEL && | |
48 | boot_cpu_data.x86 == 6 && | |
49 | boot_cpu_data.x86_model >= 15) | |
50 | return 1; | |
51 | #endif | |
52 | return 0; | |
6b8fcd90 AV |
53 | } |
54 | ||
05ca0350 AS |
55 | /* |
56 | * Find right freq to be set now with powersave_bias on. | |
07aa4402 RW |
57 | * Returns the freq_hi to be used right now and will set freq_hi_delay_us, |
58 | * freq_lo, and freq_lo_delay_us in percpu area for averaging freqs. | |
05ca0350 | 59 | */ |
fb30809e | 60 | static unsigned int generic_powersave_bias_target(struct cpufreq_policy *policy, |
4471a34f | 61 | unsigned int freq_next, unsigned int relation) |
05ca0350 AS |
62 | { |
63 | unsigned int freq_req, freq_reduc, freq_avg; | |
64 | unsigned int freq_hi, freq_lo; | |
d218ed77 | 65 | unsigned int index; |
07aa4402 | 66 | unsigned int delay_hi_us; |
bc505475 | 67 | struct policy_dbs_info *policy_dbs = policy->governor_data; |
7d5a9956 | 68 | struct od_policy_dbs_info *dbs_info = to_dbs_info(policy_dbs); |
bc505475 | 69 | struct dbs_data *dbs_data = policy_dbs->dbs_data; |
4d5dcc42 | 70 | struct od_dbs_tuners *od_tuners = dbs_data->tuners; |
34ac5d7a | 71 | struct cpufreq_frequency_table *freq_table = policy->freq_table; |
05ca0350 | 72 | |
34ac5d7a | 73 | if (!freq_table) { |
05ca0350 | 74 | dbs_info->freq_lo = 0; |
07aa4402 | 75 | dbs_info->freq_lo_delay_us = 0; |
05ca0350 AS |
76 | return freq_next; |
77 | } | |
78 | ||
d218ed77 | 79 | index = cpufreq_frequency_table_target(policy, freq_next, relation); |
34ac5d7a | 80 | freq_req = freq_table[index].frequency; |
4d5dcc42 | 81 | freq_reduc = freq_req * od_tuners->powersave_bias / 1000; |
05ca0350 AS |
82 | freq_avg = freq_req - freq_reduc; |
83 | ||
84 | /* Find freq bounds for freq_avg in freq_table */ | |
1f39fa0d VD |
85 | index = cpufreq_table_find_index_h(policy, freq_avg, |
86 | relation & CPUFREQ_RELATION_E); | |
34ac5d7a | 87 | freq_lo = freq_table[index].frequency; |
1f39fa0d VD |
88 | index = cpufreq_table_find_index_l(policy, freq_avg, |
89 | relation & CPUFREQ_RELATION_E); | |
34ac5d7a | 90 | freq_hi = freq_table[index].frequency; |
05ca0350 AS |
91 | |
92 | /* Find out how long we have to be in hi and lo freqs */ | |
93 | if (freq_hi == freq_lo) { | |
94 | dbs_info->freq_lo = 0; | |
07aa4402 | 95 | dbs_info->freq_lo_delay_us = 0; |
05ca0350 AS |
96 | return freq_lo; |
97 | } | |
07aa4402 RW |
98 | delay_hi_us = (freq_avg - freq_lo) * dbs_data->sampling_rate; |
99 | delay_hi_us += (freq_hi - freq_lo) / 2; | |
100 | delay_hi_us /= freq_hi - freq_lo; | |
101 | dbs_info->freq_hi_delay_us = delay_hi_us; | |
05ca0350 | 102 | dbs_info->freq_lo = freq_lo; |
07aa4402 | 103 | dbs_info->freq_lo_delay_us = dbs_data->sampling_rate - delay_hi_us; |
05ca0350 AS |
104 | return freq_hi; |
105 | } | |
106 | ||
d1db75ff | 107 | static void ondemand_powersave_bias_init(struct cpufreq_policy *policy) |
05ca0350 | 108 | { |
7d5a9956 | 109 | struct od_policy_dbs_info *dbs_info = to_dbs_info(policy->governor_data); |
d1db75ff | 110 | |
d1db75ff | 111 | dbs_info->freq_lo = 0; |
05ca0350 AS |
112 | } |
113 | ||
3a3e9e06 | 114 | static void dbs_freq_increase(struct cpufreq_policy *policy, unsigned int freq) |
4471a34f | 115 | { |
bc505475 RW |
116 | struct policy_dbs_info *policy_dbs = policy->governor_data; |
117 | struct dbs_data *dbs_data = policy_dbs->dbs_data; | |
4d5dcc42 VK |
118 | struct od_dbs_tuners *od_tuners = dbs_data->tuners; |
119 | ||
120 | if (od_tuners->powersave_bias) | |
3a3e9e06 | 121 | freq = od_ops.powersave_bias_target(policy, freq, |
b894d20e | 122 | CPUFREQ_RELATION_HE); |
3a3e9e06 | 123 | else if (policy->cur == policy->max) |
4471a34f | 124 | return; |
0e625ac1 | 125 | |
3a3e9e06 | 126 | __cpufreq_driver_target(policy, freq, od_tuners->powersave_bias ? |
b894d20e | 127 | CPUFREQ_RELATION_LE : CPUFREQ_RELATION_HE); |
4471a34f VK |
128 | } |
129 | ||
130 | /* | |
131 | * Every sampling_rate, we check, if current idle time is less than 20% | |
dfa5bb62 SK |
132 | * (default), then we try to increase frequency. Else, we adjust the frequency |
133 | * proportional to load. | |
4471a34f | 134 | */ |
4cccf755 | 135 | static void od_update(struct cpufreq_policy *policy) |
1da177e4 | 136 | { |
7d5a9956 RW |
137 | struct policy_dbs_info *policy_dbs = policy->governor_data; |
138 | struct od_policy_dbs_info *dbs_info = to_dbs_info(policy_dbs); | |
bc505475 | 139 | struct dbs_data *dbs_data = policy_dbs->dbs_data; |
4d5dcc42 | 140 | struct od_dbs_tuners *od_tuners = dbs_data->tuners; |
4cccf755 | 141 | unsigned int load = dbs_update(policy); |
4471a34f VK |
142 | |
143 | dbs_info->freq_lo = 0; | |
144 | ||
145 | /* Check for frequency increase */ | |
ff4b1789 | 146 | if (load > dbs_data->up_threshold) { |
4471a34f VK |
147 | /* If switching to max speed, apply sampling_down_factor */ |
148 | if (policy->cur < policy->max) | |
57dc3bcd | 149 | policy_dbs->rate_mult = dbs_data->sampling_down_factor; |
4471a34f | 150 | dbs_freq_increase(policy, policy->max); |
dfa5bb62 SK |
151 | } else { |
152 | /* Calculate the next frequency proportional to load */ | |
6393d6a1 SK |
153 | unsigned int freq_next, min_f, max_f; |
154 | ||
155 | min_f = policy->cpuinfo.min_freq; | |
156 | max_f = policy->cpuinfo.max_freq; | |
157 | freq_next = min_f + load * (max_f - min_f) / 100; | |
4471a34f VK |
158 | |
159 | /* No longer fully busy, reset rate_mult */ | |
57dc3bcd | 160 | policy_dbs->rate_mult = 1; |
4471a34f | 161 | |
a7f35cff RW |
162 | if (od_tuners->powersave_bias) |
163 | freq_next = od_ops.powersave_bias_target(policy, | |
164 | freq_next, | |
b894d20e | 165 | CPUFREQ_RELATION_LE); |
a7f35cff | 166 | |
b894d20e | 167 | __cpufreq_driver_target(policy, freq_next, CPUFREQ_RELATION_CE); |
4471a34f | 168 | } |
1da177e4 LT |
169 | } |
170 | ||
26f0dbc9 | 171 | static unsigned int od_dbs_update(struct cpufreq_policy *policy) |
4471a34f | 172 | { |
bc505475 RW |
173 | struct policy_dbs_info *policy_dbs = policy->governor_data; |
174 | struct dbs_data *dbs_data = policy_dbs->dbs_data; | |
7d5a9956 | 175 | struct od_policy_dbs_info *dbs_info = to_dbs_info(policy_dbs); |
6e96c5b3 | 176 | int sample_type = dbs_info->sample_type; |
4447266b | 177 | |
4471a34f | 178 | /* Common NORMAL_SAMPLE setup */ |
43e0ee36 | 179 | dbs_info->sample_type = OD_NORMAL_SAMPLE; |
4cccf755 RW |
180 | /* |
181 | * OD_SUB_SAMPLE doesn't make sense if sample_delay_ns is 0, so ignore | |
182 | * it then. | |
183 | */ | |
184 | if (sample_type == OD_SUB_SAMPLE && policy_dbs->sample_delay_ns > 0) { | |
43e0ee36 | 185 | __cpufreq_driver_target(policy, dbs_info->freq_lo, |
b894d20e | 186 | CPUFREQ_RELATION_HE); |
07aa4402 | 187 | return dbs_info->freq_lo_delay_us; |
6e96c5b3 RW |
188 | } |
189 | ||
190 | od_update(policy); | |
191 | ||
192 | if (dbs_info->freq_lo) { | |
26f0dbc9 | 193 | /* Setup SUB_SAMPLE */ |
6e96c5b3 | 194 | dbs_info->sample_type = OD_SUB_SAMPLE; |
07aa4402 | 195 | return dbs_info->freq_hi_delay_us; |
4471a34f VK |
196 | } |
197 | ||
07aa4402 | 198 | return dbs_data->sampling_rate * policy_dbs->rate_mult; |
da53d61e FB |
199 | } |
200 | ||
4471a34f | 201 | /************************** sysfs interface ************************/ |
7bdad34d | 202 | static struct dbs_governor od_dbs_gov; |
1da177e4 | 203 | |
85750bcd | 204 | static ssize_t io_is_busy_store(struct gov_attr_set *attr_set, const char *buf, |
0dd3c1d6 | 205 | size_t count) |
19379b11 | 206 | { |
0dd3c1d6 | 207 | struct dbs_data *dbs_data = to_dbs_data(attr_set); |
19379b11 AV |
208 | unsigned int input; |
209 | int ret; | |
210 | ||
211 | ret = sscanf(buf, "%u", &input); | |
212 | if (ret != 1) | |
213 | return -EINVAL; | |
8847e038 | 214 | dbs_data->io_is_busy = !!input; |
9366d840 SK |
215 | |
216 | /* we need to re-evaluate prev_cpu_idle */ | |
8c8f77fd | 217 | gov_update_cpu_data(dbs_data); |
a33cce1c | 218 | |
19379b11 AV |
219 | return count; |
220 | } | |
221 | ||
85750bcd | 222 | static ssize_t up_threshold_store(struct gov_attr_set *attr_set, |
0dd3c1d6 | 223 | const char *buf, size_t count) |
1da177e4 | 224 | { |
0dd3c1d6 | 225 | struct dbs_data *dbs_data = to_dbs_data(attr_set); |
1da177e4 LT |
226 | unsigned int input; |
227 | int ret; | |
ffac80e9 | 228 | ret = sscanf(buf, "%u", &input); |
1da177e4 | 229 | |
32ee8c3e | 230 | if (ret != 1 || input > MAX_FREQUENCY_UP_THRESHOLD || |
c29f1403 | 231 | input < MIN_FREQUENCY_UP_THRESHOLD) { |
1da177e4 LT |
232 | return -EINVAL; |
233 | } | |
4bd4e428 | 234 | |
ff4b1789 | 235 | dbs_data->up_threshold = input; |
1da177e4 LT |
236 | return count; |
237 | } | |
238 | ||
85750bcd | 239 | static ssize_t sampling_down_factor_store(struct gov_attr_set *attr_set, |
0dd3c1d6 | 240 | const char *buf, size_t count) |
3f78a9f7 | 241 | { |
0dd3c1d6 | 242 | struct dbs_data *dbs_data = to_dbs_data(attr_set); |
57dc3bcd RW |
243 | struct policy_dbs_info *policy_dbs; |
244 | unsigned int input; | |
3f78a9f7 DN |
245 | int ret; |
246 | ret = sscanf(buf, "%u", &input); | |
247 | ||
248 | if (ret != 1 || input > MAX_SAMPLING_DOWN_FACTOR || input < 1) | |
249 | return -EINVAL; | |
57dc3bcd | 250 | |
ff4b1789 | 251 | dbs_data->sampling_down_factor = input; |
3f78a9f7 DN |
252 | |
253 | /* Reset down sampling multiplier in case it was active */ | |
0dd3c1d6 | 254 | list_for_each_entry(policy_dbs, &attr_set->policy_list, list) { |
57dc3bcd RW |
255 | /* |
256 | * Doing this without locking might lead to using different | |
26f0dbc9 | 257 | * rate_mult values in od_update() and od_dbs_update(). |
57dc3bcd | 258 | */ |
26f0dbc9 | 259 | mutex_lock(&policy_dbs->update_mutex); |
57dc3bcd | 260 | policy_dbs->rate_mult = 1; |
26f0dbc9 | 261 | mutex_unlock(&policy_dbs->update_mutex); |
3f78a9f7 | 262 | } |
57dc3bcd | 263 | |
3f78a9f7 DN |
264 | return count; |
265 | } | |
266 | ||
85750bcd | 267 | static ssize_t ignore_nice_load_store(struct gov_attr_set *attr_set, |
0dd3c1d6 | 268 | const char *buf, size_t count) |
3d5ee9e5 | 269 | { |
0dd3c1d6 | 270 | struct dbs_data *dbs_data = to_dbs_data(attr_set); |
3d5ee9e5 DJ |
271 | unsigned int input; |
272 | int ret; | |
273 | ||
ffac80e9 | 274 | ret = sscanf(buf, "%u", &input); |
2b03f891 | 275 | if (ret != 1) |
3d5ee9e5 DJ |
276 | return -EINVAL; |
277 | ||
2b03f891 | 278 | if (input > 1) |
3d5ee9e5 | 279 | input = 1; |
32ee8c3e | 280 | |
ff4b1789 | 281 | if (input == dbs_data->ignore_nice_load) { /* nothing to do */ |
3d5ee9e5 DJ |
282 | return count; |
283 | } | |
ff4b1789 | 284 | dbs_data->ignore_nice_load = input; |
3d5ee9e5 | 285 | |
ccb2fe20 | 286 | /* we need to re-evaluate prev_cpu_idle */ |
8c8f77fd | 287 | gov_update_cpu_data(dbs_data); |
1ca3abdb | 288 | |
3d5ee9e5 DJ |
289 | return count; |
290 | } | |
291 | ||
85750bcd | 292 | static ssize_t powersave_bias_store(struct gov_attr_set *attr_set, |
0dd3c1d6 | 293 | const char *buf, size_t count) |
05ca0350 | 294 | { |
0dd3c1d6 | 295 | struct dbs_data *dbs_data = to_dbs_data(attr_set); |
4d5dcc42 | 296 | struct od_dbs_tuners *od_tuners = dbs_data->tuners; |
d1db75ff | 297 | struct policy_dbs_info *policy_dbs; |
05ca0350 AS |
298 | unsigned int input; |
299 | int ret; | |
300 | ret = sscanf(buf, "%u", &input); | |
301 | ||
302 | if (ret != 1) | |
303 | return -EINVAL; | |
304 | ||
305 | if (input > 1000) | |
306 | input = 1000; | |
307 | ||
4d5dcc42 | 308 | od_tuners->powersave_bias = input; |
d1db75ff | 309 | |
0dd3c1d6 | 310 | list_for_each_entry(policy_dbs, &attr_set->policy_list, list) |
d1db75ff RW |
311 | ondemand_powersave_bias_init(policy_dbs->policy); |
312 | ||
05ca0350 AS |
313 | return count; |
314 | } | |
315 | ||
c4435630 VK |
316 | gov_show_one_common(sampling_rate); |
317 | gov_show_one_common(up_threshold); | |
318 | gov_show_one_common(sampling_down_factor); | |
319 | gov_show_one_common(ignore_nice_load); | |
8847e038 | 320 | gov_show_one_common(io_is_busy); |
c4435630 VK |
321 | gov_show_one(od, powersave_bias); |
322 | ||
323 | gov_attr_rw(sampling_rate); | |
324 | gov_attr_rw(io_is_busy); | |
325 | gov_attr_rw(up_threshold); | |
326 | gov_attr_rw(sampling_down_factor); | |
327 | gov_attr_rw(ignore_nice_load); | |
328 | gov_attr_rw(powersave_bias); | |
c4435630 | 329 | |
fe262d5c | 330 | static struct attribute *od_attrs[] = { |
c4435630 VK |
331 | &sampling_rate.attr, |
332 | &up_threshold.attr, | |
333 | &sampling_down_factor.attr, | |
334 | &ignore_nice_load.attr, | |
335 | &powersave_bias.attr, | |
336 | &io_is_busy.attr, | |
1da177e4 LT |
337 | NULL |
338 | }; | |
fe262d5c | 339 | ATTRIBUTE_GROUPS(od); |
1da177e4 | 340 | |
1da177e4 LT |
341 | /************************** sysfs end ************************/ |
342 | ||
7d5a9956 RW |
343 | static struct policy_dbs_info *od_alloc(void) |
344 | { | |
345 | struct od_policy_dbs_info *dbs_info; | |
346 | ||
347 | dbs_info = kzalloc(sizeof(*dbs_info), GFP_KERNEL); | |
348 | return dbs_info ? &dbs_info->policy_dbs : NULL; | |
349 | } | |
350 | ||
351 | static void od_free(struct policy_dbs_info *policy_dbs) | |
352 | { | |
353 | kfree(to_dbs_info(policy_dbs)); | |
354 | } | |
355 | ||
9a15fb2c | 356 | static int od_init(struct dbs_data *dbs_data) |
4d5dcc42 VK |
357 | { |
358 | struct od_dbs_tuners *tuners; | |
359 | u64 idle_time; | |
360 | int cpu; | |
361 | ||
d5b73cd8 | 362 | tuners = kzalloc(sizeof(*tuners), GFP_KERNEL); |
a69d6b29 | 363 | if (!tuners) |
4d5dcc42 | 364 | return -ENOMEM; |
4d5dcc42 VK |
365 | |
366 | cpu = get_cpu(); | |
367 | idle_time = get_cpu_idle_time_us(cpu, NULL); | |
368 | put_cpu(); | |
369 | if (idle_time != -1ULL) { | |
370 | /* Idle micro accounting is supported. Use finer thresholds */ | |
ff4b1789 | 371 | dbs_data->up_threshold = MICRO_FREQUENCY_UP_THRESHOLD; |
4d5dcc42 | 372 | } else { |
ff4b1789 | 373 | dbs_data->up_threshold = DEF_FREQUENCY_UP_THRESHOLD; |
4d5dcc42 VK |
374 | } |
375 | ||
ff4b1789 VK |
376 | dbs_data->sampling_down_factor = DEF_SAMPLING_DOWN_FACTOR; |
377 | dbs_data->ignore_nice_load = 0; | |
c2837558 | 378 | tuners->powersave_bias = default_powersave_bias; |
8847e038 | 379 | dbs_data->io_is_busy = should_io_be_busy(); |
4d5dcc42 VK |
380 | |
381 | dbs_data->tuners = tuners; | |
4d5dcc42 VK |
382 | return 0; |
383 | } | |
384 | ||
9a15fb2c | 385 | static void od_exit(struct dbs_data *dbs_data) |
4d5dcc42 VK |
386 | { |
387 | kfree(dbs_data->tuners); | |
388 | } | |
389 | ||
702c9e54 RW |
390 | static void od_start(struct cpufreq_policy *policy) |
391 | { | |
7d5a9956 | 392 | struct od_policy_dbs_info *dbs_info = to_dbs_info(policy->governor_data); |
702c9e54 RW |
393 | |
394 | dbs_info->sample_type = OD_NORMAL_SAMPLE; | |
d1db75ff | 395 | ondemand_powersave_bias_init(policy); |
702c9e54 RW |
396 | } |
397 | ||
4471a34f | 398 | static struct od_ops od_ops = { |
fb30809e | 399 | .powersave_bias_target = generic_powersave_bias_target, |
4471a34f | 400 | }; |
2f8a835c | 401 | |
7bdad34d | 402 | static struct dbs_governor od_dbs_gov = { |
e788892b | 403 | .gov = CPUFREQ_DBS_GOVERNOR_INITIALIZER("ondemand"), |
fe262d5c | 404 | .kobj_type = { .default_groups = od_groups }, |
26f0dbc9 | 405 | .gov_dbs_update = od_dbs_update, |
7d5a9956 RW |
406 | .alloc = od_alloc, |
407 | .free = od_free, | |
4d5dcc42 VK |
408 | .init = od_init, |
409 | .exit = od_exit, | |
702c9e54 | 410 | .start = od_start, |
4471a34f | 411 | }; |
1da177e4 | 412 | |
10dd8573 | 413 | #define CPU_FREQ_GOV_ONDEMAND (od_dbs_gov.gov) |
af926185 | 414 | |
fb30809e JS |
415 | static void od_set_powersave_bias(unsigned int powersave_bias) |
416 | { | |
fb30809e | 417 | unsigned int cpu; |
3e5c04f9 ZL |
418 | cpumask_var_t done; |
419 | ||
420 | if (!alloc_cpumask_var(&done, GFP_KERNEL)) | |
421 | return; | |
fb30809e | 422 | |
c2837558 | 423 | default_powersave_bias = powersave_bias; |
3e5c04f9 | 424 | cpumask_clear(done); |
fb30809e | 425 | |
09681a07 | 426 | cpus_read_lock(); |
fb30809e | 427 | for_each_online_cpu(cpu) { |
8c8f77fd | 428 | struct cpufreq_policy *policy; |
e40e7b25 | 429 | struct policy_dbs_info *policy_dbs; |
8c8f77fd RW |
430 | struct dbs_data *dbs_data; |
431 | struct od_dbs_tuners *od_tuners; | |
44152cb8 | 432 | |
3e5c04f9 | 433 | if (cpumask_test_cpu(cpu, done)) |
fb30809e JS |
434 | continue; |
435 | ||
8c8f77fd | 436 | policy = cpufreq_cpu_get_raw(cpu); |
10dd8573 | 437 | if (!policy || policy->governor != &CPU_FREQ_GOV_ONDEMAND) |
8c8f77fd RW |
438 | continue; |
439 | ||
440 | policy_dbs = policy->governor_data; | |
e40e7b25 | 441 | if (!policy_dbs) |
c2837558 | 442 | continue; |
fb30809e | 443 | |
3e5c04f9 | 444 | cpumask_or(done, done, policy->cpus); |
c2837558 | 445 | |
bc505475 | 446 | dbs_data = policy_dbs->dbs_data; |
c2837558 JS |
447 | od_tuners = dbs_data->tuners; |
448 | od_tuners->powersave_bias = default_powersave_bias; | |
fb30809e | 449 | } |
09681a07 | 450 | cpus_read_unlock(); |
3e5c04f9 ZL |
451 | |
452 | free_cpumask_var(done); | |
fb30809e JS |
453 | } |
454 | ||
455 | void od_register_powersave_bias_handler(unsigned int (*f) | |
456 | (struct cpufreq_policy *, unsigned int, unsigned int), | |
457 | unsigned int powersave_bias) | |
458 | { | |
459 | od_ops.powersave_bias_target = f; | |
460 | od_set_powersave_bias(powersave_bias); | |
461 | } | |
462 | EXPORT_SYMBOL_GPL(od_register_powersave_bias_handler); | |
463 | ||
464 | void od_unregister_powersave_bias_handler(void) | |
465 | { | |
466 | od_ops.powersave_bias_target = generic_powersave_bias_target; | |
467 | od_set_powersave_bias(0); | |
468 | } | |
469 | EXPORT_SYMBOL_GPL(od_unregister_powersave_bias_handler); | |
470 | ||
ffac80e9 VP |
471 | MODULE_AUTHOR("Venkatesh Pallipadi <venkatesh.pallipadi@intel.com>"); |
472 | MODULE_AUTHOR("Alexey Starikovskiy <alexey.y.starikovskiy@intel.com>"); | |
473 | MODULE_DESCRIPTION("'cpufreq_ondemand' - A dynamic cpufreq governor for " | |
2b03f891 | 474 | "Low Latency Frequency Transition capable processors"); |
ffac80e9 | 475 | MODULE_LICENSE("GPL"); |
1da177e4 | 476 | |
6915719b | 477 | #ifdef CONFIG_CPU_FREQ_DEFAULT_GOV_ONDEMAND |
de1df26b RW |
478 | struct cpufreq_governor *cpufreq_default_governor(void) |
479 | { | |
10dd8573 | 480 | return &CPU_FREQ_GOV_ONDEMAND; |
de1df26b | 481 | } |
6915719b | 482 | #endif |
10dd8573 QP |
483 | |
484 | cpufreq_governor_init(CPU_FREQ_GOV_ONDEMAND); | |
485 | cpufreq_governor_exit(CPU_FREQ_GOV_ONDEMAND); |