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 | ||
3e33ee9e FB |
34 | #ifndef CONFIG_CPU_FREQ_DEFAULT_GOV_ONDEMAND |
35 | static struct cpufreq_governor cpufreq_gov_ondemand; | |
36 | #endif | |
37 | ||
c2837558 JS |
38 | static unsigned int default_powersave_bias; |
39 | ||
4471a34f | 40 | static void ondemand_powersave_bias_init_cpu(int cpu) |
6b8fcd90 | 41 | { |
4471a34f | 42 | struct od_cpu_dbs_info_s *dbs_info = &per_cpu(od_cpu_dbs_info, cpu); |
6b8fcd90 | 43 | |
4471a34f VK |
44 | dbs_info->freq_table = cpufreq_frequency_get_table(cpu); |
45 | dbs_info->freq_lo = 0; | |
46 | } | |
6b8fcd90 | 47 | |
4471a34f VK |
48 | /* |
49 | * Not all CPUs want IO time to be accounted as busy; this depends on how | |
50 | * efficient idling at a higher frequency/voltage is. | |
51 | * Pavel Machek says this is not so for various generations of AMD and old | |
52 | * Intel systems. | |
06eb09d1 | 53 | * Mike Chan (android.com) claims this is also not true for ARM. |
4471a34f VK |
54 | * Because of this, whitelist specific known (series) of CPUs by default, and |
55 | * leave all others up to the user. | |
56 | */ | |
57 | static int should_io_be_busy(void) | |
58 | { | |
59 | #if defined(CONFIG_X86) | |
60 | /* | |
06eb09d1 | 61 | * For Intel, Core 2 (model 15) and later have an efficient idle. |
4471a34f VK |
62 | */ |
63 | if (boot_cpu_data.x86_vendor == X86_VENDOR_INTEL && | |
64 | boot_cpu_data.x86 == 6 && | |
65 | boot_cpu_data.x86_model >= 15) | |
66 | return 1; | |
67 | #endif | |
68 | return 0; | |
6b8fcd90 AV |
69 | } |
70 | ||
05ca0350 AS |
71 | /* |
72 | * Find right freq to be set now with powersave_bias on. | |
73 | * Returns the freq_hi to be used right now and will set freq_hi_jiffies, | |
74 | * freq_lo, and freq_lo_jiffies in percpu area for averaging freqs. | |
75 | */ | |
fb30809e | 76 | static unsigned int generic_powersave_bias_target(struct cpufreq_policy *policy, |
4471a34f | 77 | unsigned int freq_next, unsigned int relation) |
05ca0350 AS |
78 | { |
79 | unsigned int freq_req, freq_reduc, freq_avg; | |
80 | unsigned int freq_hi, freq_lo; | |
81 | unsigned int index = 0; | |
82 | unsigned int jiffies_total, jiffies_hi, jiffies_lo; | |
4471a34f | 83 | struct od_cpu_dbs_info_s *dbs_info = &per_cpu(od_cpu_dbs_info, |
245b2e70 | 84 | policy->cpu); |
4d5dcc42 VK |
85 | struct dbs_data *dbs_data = policy->governor_data; |
86 | struct od_dbs_tuners *od_tuners = dbs_data->tuners; | |
05ca0350 AS |
87 | |
88 | if (!dbs_info->freq_table) { | |
89 | dbs_info->freq_lo = 0; | |
90 | dbs_info->freq_lo_jiffies = 0; | |
91 | return freq_next; | |
92 | } | |
93 | ||
94 | cpufreq_frequency_table_target(policy, dbs_info->freq_table, freq_next, | |
95 | relation, &index); | |
96 | freq_req = dbs_info->freq_table[index].frequency; | |
4d5dcc42 | 97 | freq_reduc = freq_req * od_tuners->powersave_bias / 1000; |
05ca0350 AS |
98 | freq_avg = freq_req - freq_reduc; |
99 | ||
100 | /* Find freq bounds for freq_avg in freq_table */ | |
101 | index = 0; | |
102 | cpufreq_frequency_table_target(policy, dbs_info->freq_table, freq_avg, | |
103 | CPUFREQ_RELATION_H, &index); | |
104 | freq_lo = dbs_info->freq_table[index].frequency; | |
105 | index = 0; | |
106 | cpufreq_frequency_table_target(policy, dbs_info->freq_table, freq_avg, | |
107 | CPUFREQ_RELATION_L, &index); | |
108 | freq_hi = dbs_info->freq_table[index].frequency; | |
109 | ||
110 | /* Find out how long we have to be in hi and lo freqs */ | |
111 | if (freq_hi == freq_lo) { | |
112 | dbs_info->freq_lo = 0; | |
113 | dbs_info->freq_lo_jiffies = 0; | |
114 | return freq_lo; | |
115 | } | |
4d5dcc42 | 116 | jiffies_total = usecs_to_jiffies(od_tuners->sampling_rate); |
05ca0350 AS |
117 | jiffies_hi = (freq_avg - freq_lo) * jiffies_total; |
118 | jiffies_hi += ((freq_hi - freq_lo) / 2); | |
119 | jiffies_hi /= (freq_hi - freq_lo); | |
120 | jiffies_lo = jiffies_total - jiffies_hi; | |
121 | dbs_info->freq_lo = freq_lo; | |
122 | dbs_info->freq_lo_jiffies = jiffies_lo; | |
123 | dbs_info->freq_hi_jiffies = jiffies_hi; | |
124 | return freq_hi; | |
125 | } | |
126 | ||
127 | static void ondemand_powersave_bias_init(void) | |
128 | { | |
129 | int i; | |
130 | for_each_online_cpu(i) { | |
5a75c828 | 131 | ondemand_powersave_bias_init_cpu(i); |
05ca0350 AS |
132 | } |
133 | } | |
134 | ||
3a3e9e06 | 135 | static void dbs_freq_increase(struct cpufreq_policy *policy, unsigned int freq) |
4471a34f | 136 | { |
3a3e9e06 | 137 | struct dbs_data *dbs_data = policy->governor_data; |
4d5dcc42 VK |
138 | struct od_dbs_tuners *od_tuners = dbs_data->tuners; |
139 | ||
140 | if (od_tuners->powersave_bias) | |
3a3e9e06 | 141 | freq = od_ops.powersave_bias_target(policy, freq, |
fb30809e | 142 | CPUFREQ_RELATION_H); |
3a3e9e06 | 143 | else if (policy->cur == policy->max) |
4471a34f | 144 | return; |
0e625ac1 | 145 | |
3a3e9e06 | 146 | __cpufreq_driver_target(policy, freq, od_tuners->powersave_bias ? |
4471a34f VK |
147 | CPUFREQ_RELATION_L : CPUFREQ_RELATION_H); |
148 | } | |
149 | ||
150 | /* | |
151 | * Every sampling_rate, we check, if current idle time is less than 20% | |
dfa5bb62 SK |
152 | * (default), then we try to increase frequency. Else, we adjust the frequency |
153 | * proportional to load. | |
4471a34f | 154 | */ |
dfa5bb62 | 155 | static void od_check_cpu(int cpu, unsigned int load) |
1da177e4 | 156 | { |
4471a34f VK |
157 | struct od_cpu_dbs_info_s *dbs_info = &per_cpu(od_cpu_dbs_info, cpu); |
158 | struct cpufreq_policy *policy = dbs_info->cdbs.cur_policy; | |
4d5dcc42 VK |
159 | struct dbs_data *dbs_data = policy->governor_data; |
160 | struct od_dbs_tuners *od_tuners = dbs_data->tuners; | |
4471a34f VK |
161 | |
162 | dbs_info->freq_lo = 0; | |
163 | ||
164 | /* Check for frequency increase */ | |
dfa5bb62 | 165 | if (load > od_tuners->up_threshold) { |
4471a34f VK |
166 | /* If switching to max speed, apply sampling_down_factor */ |
167 | if (policy->cur < policy->max) | |
168 | dbs_info->rate_mult = | |
4d5dcc42 | 169 | od_tuners->sampling_down_factor; |
4471a34f VK |
170 | dbs_freq_increase(policy, policy->max); |
171 | return; | |
dfa5bb62 SK |
172 | } else { |
173 | /* Calculate the next frequency proportional to load */ | |
4471a34f | 174 | unsigned int freq_next; |
dfa5bb62 | 175 | freq_next = load * policy->cpuinfo.max_freq / 100; |
4471a34f VK |
176 | |
177 | /* No longer fully busy, reset rate_mult */ | |
178 | dbs_info->rate_mult = 1; | |
179 | ||
4d5dcc42 | 180 | if (!od_tuners->powersave_bias) { |
4471a34f VK |
181 | __cpufreq_driver_target(policy, freq_next, |
182 | CPUFREQ_RELATION_L); | |
fb30809e | 183 | return; |
4471a34f | 184 | } |
fb30809e JS |
185 | |
186 | freq_next = od_ops.powersave_bias_target(policy, freq_next, | |
187 | CPUFREQ_RELATION_L); | |
188 | __cpufreq_driver_target(policy, freq_next, CPUFREQ_RELATION_L); | |
4471a34f | 189 | } |
1da177e4 LT |
190 | } |
191 | ||
4447266b | 192 | static void od_dbs_timer(struct work_struct *work) |
4471a34f | 193 | { |
4447266b VK |
194 | struct od_cpu_dbs_info_s *dbs_info = |
195 | container_of(work, struct od_cpu_dbs_info_s, cdbs.work.work); | |
09dca5ae | 196 | unsigned int cpu = dbs_info->cdbs.cur_policy->cpu; |
4447266b VK |
197 | struct od_cpu_dbs_info_s *core_dbs_info = &per_cpu(od_cpu_dbs_info, |
198 | cpu); | |
4d5dcc42 VK |
199 | struct dbs_data *dbs_data = dbs_info->cdbs.cur_policy->governor_data; |
200 | struct od_dbs_tuners *od_tuners = dbs_data->tuners; | |
9d445920 | 201 | int delay = 0, sample_type = core_dbs_info->sample_type; |
031299b3 | 202 | bool modify_all = true; |
4447266b VK |
203 | |
204 | mutex_lock(&core_dbs_info->cdbs.timer_mutex); | |
031299b3 VK |
205 | if (!need_load_eval(&core_dbs_info->cdbs, od_tuners->sampling_rate)) { |
206 | modify_all = false; | |
9d445920 | 207 | goto max_delay; |
031299b3 | 208 | } |
1da177e4 | 209 | |
4471a34f | 210 | /* Common NORMAL_SAMPLE setup */ |
4447266b | 211 | core_dbs_info->sample_type = OD_NORMAL_SAMPLE; |
4471a34f | 212 | if (sample_type == OD_SUB_SAMPLE) { |
4447266b | 213 | delay = core_dbs_info->freq_lo_jiffies; |
9d445920 VK |
214 | __cpufreq_driver_target(core_dbs_info->cdbs.cur_policy, |
215 | core_dbs_info->freq_lo, CPUFREQ_RELATION_H); | |
4471a34f | 216 | } else { |
9d445920 | 217 | dbs_check_cpu(dbs_data, cpu); |
4447266b | 218 | if (core_dbs_info->freq_lo) { |
4471a34f | 219 | /* Setup timer for SUB_SAMPLE */ |
4447266b VK |
220 | core_dbs_info->sample_type = OD_SUB_SAMPLE; |
221 | delay = core_dbs_info->freq_hi_jiffies; | |
4471a34f VK |
222 | } |
223 | } | |
224 | ||
9d445920 VK |
225 | max_delay: |
226 | if (!delay) | |
227 | delay = delay_for_sampling_rate(od_tuners->sampling_rate | |
228 | * core_dbs_info->rate_mult); | |
229 | ||
031299b3 | 230 | gov_queue_work(dbs_data, dbs_info->cdbs.cur_policy, delay, modify_all); |
4447266b | 231 | mutex_unlock(&core_dbs_info->cdbs.timer_mutex); |
da53d61e FB |
232 | } |
233 | ||
4471a34f | 234 | /************************** sysfs interface ************************/ |
4d5dcc42 | 235 | static struct common_dbs_data od_dbs_cdata; |
1da177e4 | 236 | |
fd0ef7a0 MH |
237 | /** |
238 | * update_sampling_rate - update sampling rate effective immediately if needed. | |
239 | * @new_rate: new sampling rate | |
240 | * | |
06eb09d1 | 241 | * If new rate is smaller than the old, simply updating |
4471a34f VK |
242 | * dbs_tuners_int.sampling_rate might not be appropriate. For example, if the |
243 | * original sampling_rate was 1 second and the requested new sampling rate is 10 | |
244 | * ms because the user needs immediate reaction from ondemand governor, but not | |
245 | * sure if higher frequency will be required or not, then, the governor may | |
246 | * change the sampling rate too late; up to 1 second later. Thus, if we are | |
247 | * reducing the sampling rate, we need to make the new value effective | |
248 | * immediately. | |
fd0ef7a0 | 249 | */ |
4d5dcc42 VK |
250 | static void update_sampling_rate(struct dbs_data *dbs_data, |
251 | unsigned int new_rate) | |
fd0ef7a0 | 252 | { |
4d5dcc42 | 253 | struct od_dbs_tuners *od_tuners = dbs_data->tuners; |
fd0ef7a0 MH |
254 | int cpu; |
255 | ||
4d5dcc42 VK |
256 | od_tuners->sampling_rate = new_rate = max(new_rate, |
257 | dbs_data->min_sampling_rate); | |
fd0ef7a0 MH |
258 | |
259 | for_each_online_cpu(cpu) { | |
260 | struct cpufreq_policy *policy; | |
4471a34f | 261 | struct od_cpu_dbs_info_s *dbs_info; |
fd0ef7a0 MH |
262 | unsigned long next_sampling, appointed_at; |
263 | ||
264 | policy = cpufreq_cpu_get(cpu); | |
265 | if (!policy) | |
266 | continue; | |
3e33ee9e FB |
267 | if (policy->governor != &cpufreq_gov_ondemand) { |
268 | cpufreq_cpu_put(policy); | |
269 | continue; | |
270 | } | |
8ee2ec51 | 271 | dbs_info = &per_cpu(od_cpu_dbs_info, cpu); |
fd0ef7a0 MH |
272 | cpufreq_cpu_put(policy); |
273 | ||
4471a34f | 274 | mutex_lock(&dbs_info->cdbs.timer_mutex); |
fd0ef7a0 | 275 | |
4471a34f VK |
276 | if (!delayed_work_pending(&dbs_info->cdbs.work)) { |
277 | mutex_unlock(&dbs_info->cdbs.timer_mutex); | |
fd0ef7a0 MH |
278 | continue; |
279 | } | |
280 | ||
4471a34f VK |
281 | next_sampling = jiffies + usecs_to_jiffies(new_rate); |
282 | appointed_at = dbs_info->cdbs.work.timer.expires; | |
fd0ef7a0 MH |
283 | |
284 | if (time_before(next_sampling, appointed_at)) { | |
285 | ||
4471a34f VK |
286 | mutex_unlock(&dbs_info->cdbs.timer_mutex); |
287 | cancel_delayed_work_sync(&dbs_info->cdbs.work); | |
288 | mutex_lock(&dbs_info->cdbs.timer_mutex); | |
fd0ef7a0 | 289 | |
031299b3 VK |
290 | gov_queue_work(dbs_data, dbs_info->cdbs.cur_policy, |
291 | usecs_to_jiffies(new_rate), true); | |
fd0ef7a0 MH |
292 | |
293 | } | |
4471a34f | 294 | mutex_unlock(&dbs_info->cdbs.timer_mutex); |
fd0ef7a0 MH |
295 | } |
296 | } | |
297 | ||
4d5dcc42 VK |
298 | static ssize_t store_sampling_rate(struct dbs_data *dbs_data, const char *buf, |
299 | size_t count) | |
1da177e4 LT |
300 | { |
301 | unsigned int input; | |
302 | int ret; | |
ffac80e9 | 303 | ret = sscanf(buf, "%u", &input); |
5a75c828 | 304 | if (ret != 1) |
305 | return -EINVAL; | |
4d5dcc42 VK |
306 | |
307 | update_sampling_rate(dbs_data, input); | |
1da177e4 LT |
308 | return count; |
309 | } | |
310 | ||
4d5dcc42 VK |
311 | static ssize_t store_io_is_busy(struct dbs_data *dbs_data, const char *buf, |
312 | size_t count) | |
19379b11 | 313 | { |
4d5dcc42 | 314 | struct od_dbs_tuners *od_tuners = dbs_data->tuners; |
19379b11 AV |
315 | unsigned int input; |
316 | int ret; | |
9366d840 | 317 | unsigned int j; |
19379b11 AV |
318 | |
319 | ret = sscanf(buf, "%u", &input); | |
320 | if (ret != 1) | |
321 | return -EINVAL; | |
4d5dcc42 | 322 | od_tuners->io_is_busy = !!input; |
9366d840 SK |
323 | |
324 | /* we need to re-evaluate prev_cpu_idle */ | |
325 | for_each_online_cpu(j) { | |
326 | struct od_cpu_dbs_info_s *dbs_info = &per_cpu(od_cpu_dbs_info, | |
327 | j); | |
328 | dbs_info->cdbs.prev_cpu_idle = get_cpu_idle_time(j, | |
329 | &dbs_info->cdbs.prev_cpu_wall, od_tuners->io_is_busy); | |
330 | } | |
19379b11 AV |
331 | return count; |
332 | } | |
333 | ||
4d5dcc42 VK |
334 | static ssize_t store_up_threshold(struct dbs_data *dbs_data, const char *buf, |
335 | size_t count) | |
1da177e4 | 336 | { |
4d5dcc42 | 337 | struct od_dbs_tuners *od_tuners = dbs_data->tuners; |
1da177e4 LT |
338 | unsigned int input; |
339 | int ret; | |
ffac80e9 | 340 | ret = sscanf(buf, "%u", &input); |
1da177e4 | 341 | |
32ee8c3e | 342 | if (ret != 1 || input > MAX_FREQUENCY_UP_THRESHOLD || |
c29f1403 | 343 | input < MIN_FREQUENCY_UP_THRESHOLD) { |
1da177e4 LT |
344 | return -EINVAL; |
345 | } | |
4bd4e428 | 346 | |
4d5dcc42 | 347 | od_tuners->up_threshold = input; |
1da177e4 LT |
348 | return count; |
349 | } | |
350 | ||
4d5dcc42 VK |
351 | static ssize_t store_sampling_down_factor(struct dbs_data *dbs_data, |
352 | const char *buf, size_t count) | |
3f78a9f7 | 353 | { |
4d5dcc42 | 354 | struct od_dbs_tuners *od_tuners = dbs_data->tuners; |
3f78a9f7 DN |
355 | unsigned int input, j; |
356 | int ret; | |
357 | ret = sscanf(buf, "%u", &input); | |
358 | ||
359 | if (ret != 1 || input > MAX_SAMPLING_DOWN_FACTOR || input < 1) | |
360 | return -EINVAL; | |
4d5dcc42 | 361 | od_tuners->sampling_down_factor = input; |
3f78a9f7 DN |
362 | |
363 | /* Reset down sampling multiplier in case it was active */ | |
364 | for_each_online_cpu(j) { | |
4471a34f VK |
365 | struct od_cpu_dbs_info_s *dbs_info = &per_cpu(od_cpu_dbs_info, |
366 | j); | |
3f78a9f7 DN |
367 | dbs_info->rate_mult = 1; |
368 | } | |
3f78a9f7 DN |
369 | return count; |
370 | } | |
371 | ||
6c4640c3 VK |
372 | static ssize_t store_ignore_nice_load(struct dbs_data *dbs_data, |
373 | const char *buf, size_t count) | |
3d5ee9e5 | 374 | { |
4d5dcc42 | 375 | struct od_dbs_tuners *od_tuners = dbs_data->tuners; |
3d5ee9e5 DJ |
376 | unsigned int input; |
377 | int ret; | |
378 | ||
379 | unsigned int j; | |
32ee8c3e | 380 | |
ffac80e9 | 381 | ret = sscanf(buf, "%u", &input); |
2b03f891 | 382 | if (ret != 1) |
3d5ee9e5 DJ |
383 | return -EINVAL; |
384 | ||
2b03f891 | 385 | if (input > 1) |
3d5ee9e5 | 386 | input = 1; |
32ee8c3e | 387 | |
6c4640c3 | 388 | if (input == od_tuners->ignore_nice_load) { /* nothing to do */ |
3d5ee9e5 DJ |
389 | return count; |
390 | } | |
6c4640c3 | 391 | od_tuners->ignore_nice_load = input; |
3d5ee9e5 | 392 | |
ccb2fe20 | 393 | /* we need to re-evaluate prev_cpu_idle */ |
dac1c1a5 | 394 | for_each_online_cpu(j) { |
4471a34f | 395 | struct od_cpu_dbs_info_s *dbs_info; |
245b2e70 | 396 | dbs_info = &per_cpu(od_cpu_dbs_info, j); |
4471a34f | 397 | dbs_info->cdbs.prev_cpu_idle = get_cpu_idle_time(j, |
9366d840 | 398 | &dbs_info->cdbs.prev_cpu_wall, od_tuners->io_is_busy); |
6c4640c3 | 399 | if (od_tuners->ignore_nice_load) |
4471a34f VK |
400 | dbs_info->cdbs.prev_cpu_nice = |
401 | kcpustat_cpu(j).cpustat[CPUTIME_NICE]; | |
1ca3abdb | 402 | |
3d5ee9e5 | 403 | } |
3d5ee9e5 DJ |
404 | return count; |
405 | } | |
406 | ||
4d5dcc42 VK |
407 | static ssize_t store_powersave_bias(struct dbs_data *dbs_data, const char *buf, |
408 | size_t count) | |
05ca0350 | 409 | { |
4d5dcc42 | 410 | struct od_dbs_tuners *od_tuners = dbs_data->tuners; |
05ca0350 AS |
411 | unsigned int input; |
412 | int ret; | |
413 | ret = sscanf(buf, "%u", &input); | |
414 | ||
415 | if (ret != 1) | |
416 | return -EINVAL; | |
417 | ||
418 | if (input > 1000) | |
419 | input = 1000; | |
420 | ||
4d5dcc42 | 421 | od_tuners->powersave_bias = input; |
05ca0350 | 422 | ondemand_powersave_bias_init(); |
05ca0350 AS |
423 | return count; |
424 | } | |
425 | ||
4d5dcc42 VK |
426 | show_store_one(od, sampling_rate); |
427 | show_store_one(od, io_is_busy); | |
428 | show_store_one(od, up_threshold); | |
429 | show_store_one(od, sampling_down_factor); | |
6c4640c3 | 430 | show_store_one(od, ignore_nice_load); |
4d5dcc42 VK |
431 | show_store_one(od, powersave_bias); |
432 | declare_show_sampling_rate_min(od); | |
433 | ||
434 | gov_sys_pol_attr_rw(sampling_rate); | |
435 | gov_sys_pol_attr_rw(io_is_busy); | |
436 | gov_sys_pol_attr_rw(up_threshold); | |
437 | gov_sys_pol_attr_rw(sampling_down_factor); | |
6c4640c3 | 438 | gov_sys_pol_attr_rw(ignore_nice_load); |
4d5dcc42 VK |
439 | gov_sys_pol_attr_rw(powersave_bias); |
440 | gov_sys_pol_attr_ro(sampling_rate_min); | |
441 | ||
442 | static struct attribute *dbs_attributes_gov_sys[] = { | |
443 | &sampling_rate_min_gov_sys.attr, | |
444 | &sampling_rate_gov_sys.attr, | |
445 | &up_threshold_gov_sys.attr, | |
446 | &sampling_down_factor_gov_sys.attr, | |
6c4640c3 | 447 | &ignore_nice_load_gov_sys.attr, |
4d5dcc42 VK |
448 | &powersave_bias_gov_sys.attr, |
449 | &io_is_busy_gov_sys.attr, | |
1da177e4 LT |
450 | NULL |
451 | }; | |
452 | ||
4d5dcc42 VK |
453 | static struct attribute_group od_attr_group_gov_sys = { |
454 | .attrs = dbs_attributes_gov_sys, | |
455 | .name = "ondemand", | |
456 | }; | |
457 | ||
458 | static struct attribute *dbs_attributes_gov_pol[] = { | |
459 | &sampling_rate_min_gov_pol.attr, | |
460 | &sampling_rate_gov_pol.attr, | |
461 | &up_threshold_gov_pol.attr, | |
462 | &sampling_down_factor_gov_pol.attr, | |
6c4640c3 | 463 | &ignore_nice_load_gov_pol.attr, |
4d5dcc42 VK |
464 | &powersave_bias_gov_pol.attr, |
465 | &io_is_busy_gov_pol.attr, | |
466 | NULL | |
467 | }; | |
468 | ||
469 | static struct attribute_group od_attr_group_gov_pol = { | |
470 | .attrs = dbs_attributes_gov_pol, | |
1da177e4 LT |
471 | .name = "ondemand", |
472 | }; | |
473 | ||
474 | /************************** sysfs end ************************/ | |
475 | ||
4d5dcc42 VK |
476 | static int od_init(struct dbs_data *dbs_data) |
477 | { | |
478 | struct od_dbs_tuners *tuners; | |
479 | u64 idle_time; | |
480 | int cpu; | |
481 | ||
d5b73cd8 | 482 | tuners = kzalloc(sizeof(*tuners), GFP_KERNEL); |
4d5dcc42 VK |
483 | if (!tuners) { |
484 | pr_err("%s: kzalloc failed\n", __func__); | |
485 | return -ENOMEM; | |
486 | } | |
487 | ||
488 | cpu = get_cpu(); | |
489 | idle_time = get_cpu_idle_time_us(cpu, NULL); | |
490 | put_cpu(); | |
491 | if (idle_time != -1ULL) { | |
492 | /* Idle micro accounting is supported. Use finer thresholds */ | |
493 | tuners->up_threshold = MICRO_FREQUENCY_UP_THRESHOLD; | |
4d5dcc42 VK |
494 | /* |
495 | * In nohz/micro accounting case we set the minimum frequency | |
496 | * not depending on HZ, but fixed (very low). The deferred | |
497 | * timer might skip some samples if idle/sleeping as needed. | |
498 | */ | |
499 | dbs_data->min_sampling_rate = MICRO_FREQUENCY_MIN_SAMPLE_RATE; | |
500 | } else { | |
501 | tuners->up_threshold = DEF_FREQUENCY_UP_THRESHOLD; | |
4d5dcc42 VK |
502 | |
503 | /* For correct statistics, we need 10 ticks for each measure */ | |
504 | dbs_data->min_sampling_rate = MIN_SAMPLING_RATE_RATIO * | |
505 | jiffies_to_usecs(10); | |
506 | } | |
507 | ||
508 | tuners->sampling_down_factor = DEF_SAMPLING_DOWN_FACTOR; | |
6c4640c3 | 509 | tuners->ignore_nice_load = 0; |
c2837558 | 510 | tuners->powersave_bias = default_powersave_bias; |
4d5dcc42 VK |
511 | tuners->io_is_busy = should_io_be_busy(); |
512 | ||
513 | dbs_data->tuners = tuners; | |
4d5dcc42 VK |
514 | mutex_init(&dbs_data->mutex); |
515 | return 0; | |
516 | } | |
517 | ||
518 | static void od_exit(struct dbs_data *dbs_data) | |
519 | { | |
520 | kfree(dbs_data->tuners); | |
521 | } | |
522 | ||
4471a34f | 523 | define_get_cpu_dbs_routines(od_cpu_dbs_info); |
6b8fcd90 | 524 | |
4471a34f | 525 | static struct od_ops od_ops = { |
4471a34f | 526 | .powersave_bias_init_cpu = ondemand_powersave_bias_init_cpu, |
fb30809e | 527 | .powersave_bias_target = generic_powersave_bias_target, |
4471a34f VK |
528 | .freq_increase = dbs_freq_increase, |
529 | }; | |
2f8a835c | 530 | |
4d5dcc42 | 531 | static struct common_dbs_data od_dbs_cdata = { |
4471a34f | 532 | .governor = GOV_ONDEMAND, |
4d5dcc42 VK |
533 | .attr_group_gov_sys = &od_attr_group_gov_sys, |
534 | .attr_group_gov_pol = &od_attr_group_gov_pol, | |
4471a34f VK |
535 | .get_cpu_cdbs = get_cpu_cdbs, |
536 | .get_cpu_dbs_info_s = get_cpu_dbs_info_s, | |
537 | .gov_dbs_timer = od_dbs_timer, | |
538 | .gov_check_cpu = od_check_cpu, | |
539 | .gov_ops = &od_ops, | |
4d5dcc42 VK |
540 | .init = od_init, |
541 | .exit = od_exit, | |
4471a34f | 542 | }; |
1da177e4 | 543 | |
fb30809e JS |
544 | static void od_set_powersave_bias(unsigned int powersave_bias) |
545 | { | |
546 | struct cpufreq_policy *policy; | |
547 | struct dbs_data *dbs_data; | |
548 | struct od_dbs_tuners *od_tuners; | |
549 | unsigned int cpu; | |
550 | cpumask_t done; | |
551 | ||
c2837558 | 552 | default_powersave_bias = powersave_bias; |
fb30809e JS |
553 | cpumask_clear(&done); |
554 | ||
555 | get_online_cpus(); | |
556 | for_each_online_cpu(cpu) { | |
557 | if (cpumask_test_cpu(cpu, &done)) | |
558 | continue; | |
559 | ||
560 | policy = per_cpu(od_cpu_dbs_info, cpu).cdbs.cur_policy; | |
c2837558 JS |
561 | if (!policy) |
562 | continue; | |
fb30809e JS |
563 | |
564 | cpumask_or(&done, &done, policy->cpus); | |
c2837558 JS |
565 | |
566 | if (policy->governor != &cpufreq_gov_ondemand) | |
567 | continue; | |
568 | ||
569 | dbs_data = policy->governor_data; | |
570 | od_tuners = dbs_data->tuners; | |
571 | od_tuners->powersave_bias = default_powersave_bias; | |
fb30809e JS |
572 | } |
573 | put_online_cpus(); | |
574 | } | |
575 | ||
576 | void od_register_powersave_bias_handler(unsigned int (*f) | |
577 | (struct cpufreq_policy *, unsigned int, unsigned int), | |
578 | unsigned int powersave_bias) | |
579 | { | |
580 | od_ops.powersave_bias_target = f; | |
581 | od_set_powersave_bias(powersave_bias); | |
582 | } | |
583 | EXPORT_SYMBOL_GPL(od_register_powersave_bias_handler); | |
584 | ||
585 | void od_unregister_powersave_bias_handler(void) | |
586 | { | |
587 | od_ops.powersave_bias_target = generic_powersave_bias_target; | |
588 | od_set_powersave_bias(0); | |
589 | } | |
590 | EXPORT_SYMBOL_GPL(od_unregister_powersave_bias_handler); | |
591 | ||
4471a34f VK |
592 | static int od_cpufreq_governor_dbs(struct cpufreq_policy *policy, |
593 | unsigned int event) | |
1da177e4 | 594 | { |
4d5dcc42 | 595 | return cpufreq_governor_dbs(policy, &od_dbs_cdata, event); |
1da177e4 LT |
596 | } |
597 | ||
4471a34f VK |
598 | #ifndef CONFIG_CPU_FREQ_DEFAULT_GOV_ONDEMAND |
599 | static | |
19379b11 | 600 | #endif |
4471a34f VK |
601 | struct cpufreq_governor cpufreq_gov_ondemand = { |
602 | .name = "ondemand", | |
603 | .governor = od_cpufreq_governor_dbs, | |
604 | .max_transition_latency = TRANSITION_LATENCY_LIMIT, | |
605 | .owner = THIS_MODULE, | |
606 | }; | |
1da177e4 | 607 | |
1da177e4 LT |
608 | static int __init cpufreq_gov_dbs_init(void) |
609 | { | |
57df5573 | 610 | return cpufreq_register_governor(&cpufreq_gov_ondemand); |
1da177e4 LT |
611 | } |
612 | ||
613 | static void __exit cpufreq_gov_dbs_exit(void) | |
614 | { | |
1c256245 | 615 | cpufreq_unregister_governor(&cpufreq_gov_ondemand); |
1da177e4 LT |
616 | } |
617 | ||
ffac80e9 VP |
618 | MODULE_AUTHOR("Venkatesh Pallipadi <venkatesh.pallipadi@intel.com>"); |
619 | MODULE_AUTHOR("Alexey Starikovskiy <alexey.y.starikovskiy@intel.com>"); | |
620 | MODULE_DESCRIPTION("'cpufreq_ondemand' - A dynamic cpufreq governor for " | |
2b03f891 | 621 | "Low Latency Frequency Transition capable processors"); |
ffac80e9 | 622 | MODULE_LICENSE("GPL"); |
1da177e4 | 623 | |
6915719b JW |
624 | #ifdef CONFIG_CPU_FREQ_DEFAULT_GOV_ONDEMAND |
625 | fs_initcall(cpufreq_gov_dbs_init); | |
626 | #else | |
1da177e4 | 627 | module_init(cpufreq_gov_dbs_init); |
6915719b | 628 | #endif |
1da177e4 | 629 | module_exit(cpufreq_gov_dbs_exit); |