blob: 3a1f49f5f4c68ae4d360e686773cafc2d49b8745 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
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
Viresh Kumar4471a342012-10-26 00:47:42 +020013#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
14
Viresh Kumar5ff0a262013-08-06 22:53:03 +053015#include <linux/cpu.h>
Viresh Kumar4471a342012-10-26 00:47:42 +020016#include <linux/percpu-defs.h>
Viresh Kumar4d5dcc42013-03-27 15:58:58 +000017#include <linux/slab.h>
venkatesh.pallipadi@intel.com80800912008-08-04 11:59:12 -070018#include <linux/tick.h>
Rafael J. Wysocki7d5a9952016-02-18 18:40:14 +010019
20#include "cpufreq_ondemand.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070021
Stratos Karafotis06eb09d2013-02-08 17:24:18 +000022/* On-demand governor macros */
Linus Torvalds1da177e2005-04-16 15:20:36 -070023#define DEF_FREQUENCY_UP_THRESHOLD (80)
David C Niemi3f78a9f2010-10-06 16:54:24 -040024#define DEF_SAMPLING_DOWN_FACTOR (1)
25#define MAX_SAMPLING_DOWN_FACTOR (100000)
venkatesh.pallipadi@intel.com80800912008-08-04 11:59:12 -070026#define MICRO_FREQUENCY_UP_THRESHOLD (95)
Thomas Renningercef96152009-04-22 13:48:29 +020027#define MICRO_FREQUENCY_MIN_SAMPLE_RATE (10000)
Dave Jonesc29f1402005-05-31 19:03:50 -070028#define MIN_FREQUENCY_UP_THRESHOLD (11)
Linus Torvalds1da177e2005-04-16 15:20:36 -070029#define MAX_FREQUENCY_UP_THRESHOLD (100)
30
Jacob Shinfb308092013-04-02 09:56:56 -050031static struct od_ops od_ops;
32
Jacob Shinc2837552013-06-25 22:42:37 +020033static unsigned int default_powersave_bias;
34
Viresh Kumar4471a342012-10-26 00:47:42 +020035/*
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.
Stratos Karafotis06eb09d2013-02-08 17:24:18 +000040 * Mike Chan (android.com) claims this is also not true for ARM.
Viresh Kumar4471a342012-10-26 00:47:42 +020041 * Because of this, whitelist specific known (series) of CPUs by default, and
42 * leave all others up to the user.
43 */
44static int should_io_be_busy(void)
45{
46#if defined(CONFIG_X86)
47 /*
Stratos Karafotis06eb09d2013-02-08 17:24:18 +000048 * For Intel, Core 2 (model 15) and later have an efficient idle.
Viresh Kumar4471a342012-10-26 00:47:42 +020049 */
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;
Arjan van de Ven6b8fcd92010-05-09 08:26:06 -070056}
57
Alexey Starikovskiy05ca0352006-07-31 22:28:12 +040058/*
59 * Find right freq to be set now with powersave_bias on.
Rafael J. Wysocki07aa4402016-02-15 02:22:13 +010060 * 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.
Alexey Starikovskiy05ca0352006-07-31 22:28:12 +040062 */
Jacob Shinfb308092013-04-02 09:56:56 -050063static unsigned int generic_powersave_bias_target(struct cpufreq_policy *policy,
Viresh Kumar4471a342012-10-26 00:47:42 +020064 unsigned int freq_next, unsigned int relation)
Alexey Starikovskiy05ca0352006-07-31 22:28:12 +040065{
66 unsigned int freq_req, freq_reduc, freq_avg;
67 unsigned int freq_hi, freq_lo;
Viresh Kumard218ed72016-06-03 10:58:51 +053068 unsigned int index;
Rafael J. Wysocki07aa4402016-02-15 02:22:13 +010069 unsigned int delay_hi_us;
Rafael J. Wysockibc505472016-02-07 16:24:26 +010070 struct policy_dbs_info *policy_dbs = policy->governor_data;
Rafael J. Wysocki7d5a9952016-02-18 18:40:14 +010071 struct od_policy_dbs_info *dbs_info = to_dbs_info(policy_dbs);
Rafael J. Wysockibc505472016-02-07 16:24:26 +010072 struct dbs_data *dbs_data = policy_dbs->dbs_data;
Viresh Kumar4d5dcc42013-03-27 15:58:58 +000073 struct od_dbs_tuners *od_tuners = dbs_data->tuners;
Viresh Kumar34ac5d72016-06-03 10:58:48 +053074 struct cpufreq_frequency_table *freq_table = policy->freq_table;
Alexey Starikovskiy05ca0352006-07-31 22:28:12 +040075
Viresh Kumar34ac5d72016-06-03 10:58:48 +053076 if (!freq_table) {
Alexey Starikovskiy05ca0352006-07-31 22:28:12 +040077 dbs_info->freq_lo = 0;
Rafael J. Wysocki07aa4402016-02-15 02:22:13 +010078 dbs_info->freq_lo_delay_us = 0;
Alexey Starikovskiy05ca0352006-07-31 22:28:12 +040079 return freq_next;
80 }
81
Viresh Kumard218ed72016-06-03 10:58:51 +053082 index = cpufreq_frequency_table_target(policy, freq_next, relation);
Viresh Kumar34ac5d72016-06-03 10:58:48 +053083 freq_req = freq_table[index].frequency;
Viresh Kumar4d5dcc42013-03-27 15:58:58 +000084 freq_reduc = freq_req * od_tuners->powersave_bias / 1000;
Alexey Starikovskiy05ca0352006-07-31 22:28:12 +040085 freq_avg = freq_req - freq_reduc;
86
87 /* Find freq bounds for freq_avg in freq_table */
Viresh Kumar82577362016-06-27 09:59:34 +053088 index = cpufreq_table_find_index_h(policy, freq_avg);
Viresh Kumar34ac5d72016-06-03 10:58:48 +053089 freq_lo = freq_table[index].frequency;
Viresh Kumar82577362016-06-27 09:59:34 +053090 index = cpufreq_table_find_index_l(policy, freq_avg);
Viresh Kumar34ac5d72016-06-03 10:58:48 +053091 freq_hi = freq_table[index].frequency;
Alexey Starikovskiy05ca0352006-07-31 22:28:12 +040092
93 /* Find out how long we have to be in hi and lo freqs */
94 if (freq_hi == freq_lo) {
95 dbs_info->freq_lo = 0;
Rafael J. Wysocki07aa4402016-02-15 02:22:13 +010096 dbs_info->freq_lo_delay_us = 0;
Alexey Starikovskiy05ca0352006-07-31 22:28:12 +040097 return freq_lo;
98 }
Rafael J. Wysocki07aa4402016-02-15 02:22:13 +010099 delay_hi_us = (freq_avg - freq_lo) * dbs_data->sampling_rate;
100 delay_hi_us += (freq_hi - freq_lo) / 2;
101 delay_hi_us /= freq_hi - freq_lo;
102 dbs_info->freq_hi_delay_us = delay_hi_us;
Alexey Starikovskiy05ca0352006-07-31 22:28:12 +0400103 dbs_info->freq_lo = freq_lo;
Rafael J. Wysocki07aa4402016-02-15 02:22:13 +0100104 dbs_info->freq_lo_delay_us = dbs_data->sampling_rate - delay_hi_us;
Alexey Starikovskiy05ca0352006-07-31 22:28:12 +0400105 return freq_hi;
106}
107
Rafael J. Wysockid1db75f2016-02-18 02:28:24 +0100108static void ondemand_powersave_bias_init(struct cpufreq_policy *policy)
Alexey Starikovskiy05ca0352006-07-31 22:28:12 +0400109{
Rafael J. Wysocki7d5a9952016-02-18 18:40:14 +0100110 struct od_policy_dbs_info *dbs_info = to_dbs_info(policy->governor_data);
Rafael J. Wysockid1db75f2016-02-18 02:28:24 +0100111
Rafael J. Wysockid1db75f2016-02-18 02:28:24 +0100112 dbs_info->freq_lo = 0;
Alexey Starikovskiy05ca0352006-07-31 22:28:12 +0400113}
114
Viresh Kumar3a3e9e02013-08-06 22:53:05 +0530115static void dbs_freq_increase(struct cpufreq_policy *policy, unsigned int freq)
Viresh Kumar4471a342012-10-26 00:47:42 +0200116{
Rafael J. Wysockibc505472016-02-07 16:24:26 +0100117 struct policy_dbs_info *policy_dbs = policy->governor_data;
118 struct dbs_data *dbs_data = policy_dbs->dbs_data;
Viresh Kumar4d5dcc42013-03-27 15:58:58 +0000119 struct od_dbs_tuners *od_tuners = dbs_data->tuners;
120
121 if (od_tuners->powersave_bias)
Viresh Kumar3a3e9e02013-08-06 22:53:05 +0530122 freq = od_ops.powersave_bias_target(policy, freq,
Jacob Shinfb308092013-04-02 09:56:56 -0500123 CPUFREQ_RELATION_H);
Viresh Kumar3a3e9e02013-08-06 22:53:05 +0530124 else if (policy->cur == policy->max)
Viresh Kumar4471a342012-10-26 00:47:42 +0200125 return;
126
Viresh Kumar3a3e9e02013-08-06 22:53:05 +0530127 __cpufreq_driver_target(policy, freq, od_tuners->powersave_bias ?
Viresh Kumar4471a342012-10-26 00:47:42 +0200128 CPUFREQ_RELATION_L : CPUFREQ_RELATION_H);
129}
130
131/*
132 * Every sampling_rate, we check, if current idle time is less than 20%
Stratos Karafotisdfa5bb62013-06-05 19:01:25 +0300133 * (default), then we try to increase frequency. Else, we adjust the frequency
134 * proportional to load.
Viresh Kumar4471a342012-10-26 00:47:42 +0200135 */
Rafael J. Wysocki4cccf752016-02-15 02:19:31 +0100136static void od_update(struct cpufreq_policy *policy)
Viresh Kumar4471a342012-10-26 00:47:42 +0200137{
Rafael J. Wysocki7d5a9952016-02-18 18:40:14 +0100138 struct policy_dbs_info *policy_dbs = policy->governor_data;
139 struct od_policy_dbs_info *dbs_info = to_dbs_info(policy_dbs);
Rafael J. Wysockibc505472016-02-07 16:24:26 +0100140 struct dbs_data *dbs_data = policy_dbs->dbs_data;
Viresh Kumar4d5dcc42013-03-27 15:58:58 +0000141 struct od_dbs_tuners *od_tuners = dbs_data->tuners;
Rafael J. Wysocki4cccf752016-02-15 02:19:31 +0100142 unsigned int load = dbs_update(policy);
Viresh Kumar4471a342012-10-26 00:47:42 +0200143
144 dbs_info->freq_lo = 0;
145
146 /* Check for frequency increase */
Viresh Kumarff4b1782016-02-09 09:01:32 +0530147 if (load > dbs_data->up_threshold) {
Viresh Kumar4471a342012-10-26 00:47:42 +0200148 /* If switching to max speed, apply sampling_down_factor */
149 if (policy->cur < policy->max)
Rafael J. Wysocki57dc3bc2016-02-15 02:20:51 +0100150 policy_dbs->rate_mult = dbs_data->sampling_down_factor;
Viresh Kumar4471a342012-10-26 00:47:42 +0200151 dbs_freq_increase(policy, policy->max);
Stratos Karafotisdfa5bb62013-06-05 19:01:25 +0300152 } else {
153 /* Calculate the next frequency proportional to load */
Stratos Karafotis6393d6a2014-06-30 19:59:34 +0300154 unsigned int freq_next, min_f, max_f;
155
156 min_f = policy->cpuinfo.min_freq;
157 max_f = policy->cpuinfo.max_freq;
158 freq_next = min_f + load * (max_f - min_f) / 100;
Viresh Kumar4471a342012-10-26 00:47:42 +0200159
160 /* No longer fully busy, reset rate_mult */
Rafael J. Wysocki57dc3bc2016-02-15 02:20:51 +0100161 policy_dbs->rate_mult = 1;
Viresh Kumar4471a342012-10-26 00:47:42 +0200162
Rafael J. Wysockia7f35cf2016-02-16 21:02:24 +0100163 if (od_tuners->powersave_bias)
164 freq_next = od_ops.powersave_bias_target(policy,
165 freq_next,
166 CPUFREQ_RELATION_L);
Jacob Shinfb308092013-04-02 09:56:56 -0500167
Stratos Karafotis6393d6a2014-06-30 19:59:34 +0300168 __cpufreq_driver_target(policy, freq_next, CPUFREQ_RELATION_C);
Viresh Kumar4471a342012-10-26 00:47:42 +0200169 }
170}
171
Rafael J. Wysocki9be4fd22016-02-10 16:53:50 +0100172static unsigned int od_dbs_timer(struct cpufreq_policy *policy)
Fabio Baltierida53d612012-12-27 14:55:40 +0000173{
Rafael J. Wysockibc505472016-02-07 16:24:26 +0100174 struct policy_dbs_info *policy_dbs = policy->governor_data;
175 struct dbs_data *dbs_data = policy_dbs->dbs_data;
Rafael J. Wysocki7d5a9952016-02-18 18:40:14 +0100176 struct od_policy_dbs_info *dbs_info = to_dbs_info(policy_dbs);
Rafael J. Wysocki6e96c5b2016-02-15 02:21:35 +0100177 int sample_type = dbs_info->sample_type;
Fabio Baltierida53d612012-12-27 14:55:40 +0000178
Viresh Kumar44472662013-01-31 17:28:02 +0000179 /* Common NORMAL_SAMPLE setup */
Viresh Kumar43e0ee32015-07-18 11:31:00 +0530180 dbs_info->sample_type = OD_NORMAL_SAMPLE;
Rafael J. Wysocki4cccf752016-02-15 02:19:31 +0100181 /*
182 * OD_SUB_SAMPLE doesn't make sense if sample_delay_ns is 0, so ignore
183 * it then.
184 */
185 if (sample_type == OD_SUB_SAMPLE && policy_dbs->sample_delay_ns > 0) {
Viresh Kumar43e0ee32015-07-18 11:31:00 +0530186 __cpufreq_driver_target(policy, dbs_info->freq_lo,
Viresh Kumar42994af2015-06-19 17:18:05 +0530187 CPUFREQ_RELATION_H);
Rafael J. Wysocki07aa4402016-02-15 02:22:13 +0100188 return dbs_info->freq_lo_delay_us;
Fabio Baltierida53d612012-12-27 14:55:40 +0000189 }
Viresh Kumar44472662013-01-31 17:28:02 +0000190
Rafael J. Wysocki6e96c5b2016-02-15 02:21:35 +0100191 od_update(policy);
192
193 if (dbs_info->freq_lo) {
194 /* Setup timer for SUB_SAMPLE */
195 dbs_info->sample_type = OD_SUB_SAMPLE;
Rafael J. Wysocki07aa4402016-02-15 02:22:13 +0100196 return dbs_info->freq_hi_delay_us;
Rafael J. Wysocki6e96c5b2016-02-15 02:21:35 +0100197 }
198
Rafael J. Wysocki07aa4402016-02-15 02:22:13 +0100199 return dbs_data->sampling_rate * policy_dbs->rate_mult;
Fabio Baltierida53d612012-12-27 14:55:40 +0000200}
201
Linus Torvalds1da177e2005-04-16 15:20:36 -0700202/************************** sysfs interface ************************/
Rafael J. Wysocki7bdad342016-02-07 16:05:07 +0100203static struct dbs_governor od_dbs_gov;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700204
Rafael J. Wysocki0dd3c1d2016-03-22 02:47:51 +0100205static ssize_t store_io_is_busy(struct gov_attr_set *attr_set, const char *buf,
206 size_t count)
Arjan van de Ven19379b12010-05-09 08:26:51 -0700207{
Rafael J. Wysocki0dd3c1d2016-03-22 02:47:51 +0100208 struct dbs_data *dbs_data = to_dbs_data(attr_set);
Arjan van de Ven19379b12010-05-09 08:26:51 -0700209 unsigned int input;
210 int ret;
211
212 ret = sscanf(buf, "%u", &input);
213 if (ret != 1)
214 return -EINVAL;
Rafael J. Wysocki8847e032016-02-18 02:20:13 +0100215 dbs_data->io_is_busy = !!input;
Stratos Karafotis9366d842013-02-28 16:57:32 +0000216
217 /* we need to re-evaluate prev_cpu_idle */
Rafael J. Wysocki8c8f77f2016-02-21 00:51:27 +0100218 gov_update_cpu_data(dbs_data);
Rafael J. Wysockia33cce12016-02-18 02:26:55 +0100219
Arjan van de Ven19379b12010-05-09 08:26:51 -0700220 return count;
221}
222
Rafael J. Wysocki0dd3c1d2016-03-22 02:47:51 +0100223static ssize_t store_up_threshold(struct gov_attr_set *attr_set,
224 const char *buf, size_t count)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700225{
Rafael J. Wysocki0dd3c1d2016-03-22 02:47:51 +0100226 struct dbs_data *dbs_data = to_dbs_data(attr_set);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700227 unsigned int input;
228 int ret;
Venkatesh Pallipadiffac80e2006-06-28 13:52:18 -0700229 ret = sscanf(buf, "%u", &input);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700230
Dave Jones32ee8c32006-02-28 00:43:23 -0500231 if (ret != 1 || input > MAX_FREQUENCY_UP_THRESHOLD ||
Dave Jonesc29f1402005-05-31 19:03:50 -0700232 input < MIN_FREQUENCY_UP_THRESHOLD) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700233 return -EINVAL;
234 }
Stratos Karafotis4bd4e422013-02-06 13:34:00 +0100235
Viresh Kumarff4b1782016-02-09 09:01:32 +0530236 dbs_data->up_threshold = input;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700237 return count;
238}
239
Rafael J. Wysocki0dd3c1d2016-03-22 02:47:51 +0100240static ssize_t store_sampling_down_factor(struct gov_attr_set *attr_set,
241 const char *buf, size_t count)
David C Niemi3f78a9f2010-10-06 16:54:24 -0400242{
Rafael J. Wysocki0dd3c1d2016-03-22 02:47:51 +0100243 struct dbs_data *dbs_data = to_dbs_data(attr_set);
Rafael J. Wysocki57dc3bc2016-02-15 02:20:51 +0100244 struct policy_dbs_info *policy_dbs;
245 unsigned int input;
David C Niemi3f78a9f2010-10-06 16:54:24 -0400246 int ret;
247 ret = sscanf(buf, "%u", &input);
248
249 if (ret != 1 || input > MAX_SAMPLING_DOWN_FACTOR || input < 1)
250 return -EINVAL;
Rafael J. Wysocki57dc3bc2016-02-15 02:20:51 +0100251
Viresh Kumarff4b1782016-02-09 09:01:32 +0530252 dbs_data->sampling_down_factor = input;
David C Niemi3f78a9f2010-10-06 16:54:24 -0400253
254 /* Reset down sampling multiplier in case it was active */
Rafael J. Wysocki0dd3c1d2016-03-22 02:47:51 +0100255 list_for_each_entry(policy_dbs, &attr_set->policy_list, list) {
Rafael J. Wysocki57dc3bc2016-02-15 02:20:51 +0100256 /*
257 * Doing this without locking might lead to using different
258 * rate_mult values in od_update() and od_dbs_timer().
259 */
260 mutex_lock(&policy_dbs->timer_mutex);
261 policy_dbs->rate_mult = 1;
262 mutex_unlock(&policy_dbs->timer_mutex);
David C Niemi3f78a9f2010-10-06 16:54:24 -0400263 }
Rafael J. Wysocki57dc3bc2016-02-15 02:20:51 +0100264
David C Niemi3f78a9f2010-10-06 16:54:24 -0400265 return count;
266}
267
Rafael J. Wysocki0dd3c1d2016-03-22 02:47:51 +0100268static ssize_t store_ignore_nice_load(struct gov_attr_set *attr_set,
269 const char *buf, size_t count)
Dave Jones3d5ee9e2005-05-31 19:03:47 -0700270{
Rafael J. Wysocki0dd3c1d2016-03-22 02:47:51 +0100271 struct dbs_data *dbs_data = to_dbs_data(attr_set);
Dave Jones3d5ee9e2005-05-31 19:03:47 -0700272 unsigned int input;
273 int ret;
274
Venkatesh Pallipadiffac80e2006-06-28 13:52:18 -0700275 ret = sscanf(buf, "%u", &input);
Dave Jones2b03f892009-01-18 01:43:44 -0500276 if (ret != 1)
Dave Jones3d5ee9e2005-05-31 19:03:47 -0700277 return -EINVAL;
278
Dave Jones2b03f892009-01-18 01:43:44 -0500279 if (input > 1)
Dave Jones3d5ee9e2005-05-31 19:03:47 -0700280 input = 1;
Dave Jones32ee8c32006-02-28 00:43:23 -0500281
Viresh Kumarff4b1782016-02-09 09:01:32 +0530282 if (input == dbs_data->ignore_nice_load) { /* nothing to do */
Dave Jones3d5ee9e2005-05-31 19:03:47 -0700283 return count;
284 }
Viresh Kumarff4b1782016-02-09 09:01:32 +0530285 dbs_data->ignore_nice_load = input;
Dave Jones3d5ee9e2005-05-31 19:03:47 -0700286
Venkatesh Pallipadiccb2fe22006-06-28 13:49:52 -0700287 /* we need to re-evaluate prev_cpu_idle */
Rafael J. Wysocki8c8f77f2016-02-21 00:51:27 +0100288 gov_update_cpu_data(dbs_data);
Venkatesh Pallipadi1ca3abd2009-01-23 09:25:02 -0500289
Dave Jones3d5ee9e2005-05-31 19:03:47 -0700290 return count;
291}
292
Rafael J. Wysocki0dd3c1d2016-03-22 02:47:51 +0100293static ssize_t store_powersave_bias(struct gov_attr_set *attr_set,
294 const char *buf, size_t count)
Alexey Starikovskiy05ca0352006-07-31 22:28:12 +0400295{
Rafael J. Wysocki0dd3c1d2016-03-22 02:47:51 +0100296 struct dbs_data *dbs_data = to_dbs_data(attr_set);
Viresh Kumar4d5dcc42013-03-27 15:58:58 +0000297 struct od_dbs_tuners *od_tuners = dbs_data->tuners;
Rafael J. Wysockid1db75f2016-02-18 02:28:24 +0100298 struct policy_dbs_info *policy_dbs;
Alexey Starikovskiy05ca0352006-07-31 22:28:12 +0400299 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
Viresh Kumar4d5dcc42013-03-27 15:58:58 +0000309 od_tuners->powersave_bias = input;
Rafael J. Wysockid1db75f2016-02-18 02:28:24 +0100310
Rafael J. Wysocki0dd3c1d2016-03-22 02:47:51 +0100311 list_for_each_entry(policy_dbs, &attr_set->policy_list, list)
Rafael J. Wysockid1db75f2016-02-18 02:28:24 +0100312 ondemand_powersave_bias_init(policy_dbs->policy);
313
Alexey Starikovskiy05ca0352006-07-31 22:28:12 +0400314 return count;
315}
316
Viresh Kumarc4435632016-02-09 09:01:33 +0530317gov_show_one_common(sampling_rate);
318gov_show_one_common(up_threshold);
319gov_show_one_common(sampling_down_factor);
320gov_show_one_common(ignore_nice_load);
321gov_show_one_common(min_sampling_rate);
Rafael J. Wysocki8847e032016-02-18 02:20:13 +0100322gov_show_one_common(io_is_busy);
Viresh Kumarc4435632016-02-09 09:01:33 +0530323gov_show_one(od, powersave_bias);
Viresh Kumar4471a342012-10-26 00:47:42 +0200324
Viresh Kumarc4435632016-02-09 09:01:33 +0530325gov_attr_rw(sampling_rate);
326gov_attr_rw(io_is_busy);
327gov_attr_rw(up_threshold);
328gov_attr_rw(sampling_down_factor);
329gov_attr_rw(ignore_nice_load);
330gov_attr_rw(powersave_bias);
331gov_attr_ro(min_sampling_rate);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700332
Viresh Kumarc4435632016-02-09 09:01:33 +0530333static 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,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700341 NULL
342};
343
Linus Torvalds1da177e2005-04-16 15:20:36 -0700344/************************** sysfs end ************************/
345
Rafael J. Wysocki7d5a9952016-02-18 18:40:14 +0100346static 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
354static void od_free(struct policy_dbs_info *policy_dbs)
355{
356 kfree(to_dbs_info(policy_dbs));
357}
358
Rafael J. Wysocki9a15fb22016-05-18 22:59:49 +0200359static int od_init(struct dbs_data *dbs_data)
Viresh Kumar4d5dcc42013-03-27 15:58:58 +0000360{
361 struct od_dbs_tuners *tuners;
362 u64 idle_time;
363 int cpu;
364
Viresh Kumard5b73cd2013-08-06 22:53:06 +0530365 tuners = kzalloc(sizeof(*tuners), GFP_KERNEL);
Viresh Kumara69d6b22016-05-18 17:55:26 +0530366 if (!tuners)
Viresh Kumar4d5dcc42013-03-27 15:58:58 +0000367 return -ENOMEM;
Viresh Kumar4d5dcc42013-03-27 15:58:58 +0000368
369 cpu = get_cpu();
370 idle_time = get_cpu_idle_time_us(cpu, NULL);
371 put_cpu();
372 if (idle_time != -1ULL) {
373 /* Idle micro accounting is supported. Use finer thresholds */
Viresh Kumarff4b1782016-02-09 09:01:32 +0530374 dbs_data->up_threshold = MICRO_FREQUENCY_UP_THRESHOLD;
Viresh Kumar4d5dcc42013-03-27 15:58:58 +0000375 /*
376 * In nohz/micro accounting case we set the minimum frequency
377 * not depending on HZ, but fixed (very low). The deferred
378 * timer might skip some samples if idle/sleeping as needed.
379 */
380 dbs_data->min_sampling_rate = MICRO_FREQUENCY_MIN_SAMPLE_RATE;
381 } else {
Viresh Kumarff4b1782016-02-09 09:01:32 +0530382 dbs_data->up_threshold = DEF_FREQUENCY_UP_THRESHOLD;
Viresh Kumar4d5dcc42013-03-27 15:58:58 +0000383
384 /* For correct statistics, we need 10 ticks for each measure */
385 dbs_data->min_sampling_rate = MIN_SAMPLING_RATE_RATIO *
386 jiffies_to_usecs(10);
387 }
388
Viresh Kumarff4b1782016-02-09 09:01:32 +0530389 dbs_data->sampling_down_factor = DEF_SAMPLING_DOWN_FACTOR;
390 dbs_data->ignore_nice_load = 0;
Jacob Shinc2837552013-06-25 22:42:37 +0200391 tuners->powersave_bias = default_powersave_bias;
Rafael J. Wysocki8847e032016-02-18 02:20:13 +0100392 dbs_data->io_is_busy = should_io_be_busy();
Viresh Kumar4d5dcc42013-03-27 15:58:58 +0000393
394 dbs_data->tuners = tuners;
Viresh Kumar4d5dcc42013-03-27 15:58:58 +0000395 return 0;
396}
397
Rafael J. Wysocki9a15fb22016-05-18 22:59:49 +0200398static void od_exit(struct dbs_data *dbs_data)
Viresh Kumar4d5dcc42013-03-27 15:58:58 +0000399{
400 kfree(dbs_data->tuners);
401}
402
Rafael J. Wysocki702c9e52016-02-18 02:21:21 +0100403static void od_start(struct cpufreq_policy *policy)
404{
Rafael J. Wysocki7d5a9952016-02-18 18:40:14 +0100405 struct od_policy_dbs_info *dbs_info = to_dbs_info(policy->governor_data);
Rafael J. Wysocki702c9e52016-02-18 02:21:21 +0100406
407 dbs_info->sample_type = OD_NORMAL_SAMPLE;
Rafael J. Wysockid1db75f2016-02-18 02:28:24 +0100408 ondemand_powersave_bias_init(policy);
Rafael J. Wysocki702c9e52016-02-18 02:21:21 +0100409}
410
Viresh Kumar4471a342012-10-26 00:47:42 +0200411static struct od_ops od_ops = {
Jacob Shinfb308092013-04-02 09:56:56 -0500412 .powersave_bias_target = generic_powersave_bias_target,
Viresh Kumar4471a342012-10-26 00:47:42 +0200413};
414
Rafael J. Wysocki7bdad342016-02-07 16:05:07 +0100415static struct dbs_governor od_dbs_gov = {
Rafael J. Wysockie7888922016-06-02 23:24:15 +0200416 .gov = CPUFREQ_DBS_GOVERNOR_INITIALIZER("ondemand"),
Viresh Kumarc4435632016-02-09 09:01:33 +0530417 .kobj_type = { .default_attrs = od_attributes },
Viresh Kumar4471a342012-10-26 00:47:42 +0200418 .gov_dbs_timer = od_dbs_timer,
Rafael J. Wysocki7d5a9952016-02-18 18:40:14 +0100419 .alloc = od_alloc,
420 .free = od_free,
Viresh Kumar4d5dcc42013-03-27 15:58:58 +0000421 .init = od_init,
422 .exit = od_exit,
Rafael J. Wysocki702c9e52016-02-18 02:21:21 +0100423 .start = od_start,
Viresh Kumar4471a342012-10-26 00:47:42 +0200424};
425
Rafael J. Wysocki7bdad342016-02-07 16:05:07 +0100426#define CPU_FREQ_GOV_ONDEMAND (&od_dbs_gov.gov)
Rafael J. Wysockiaf926182016-02-05 03:16:08 +0100427
Jacob Shinfb308092013-04-02 09:56:56 -0500428static void od_set_powersave_bias(unsigned int powersave_bias)
429{
Jacob Shinfb308092013-04-02 09:56:56 -0500430 unsigned int cpu;
431 cpumask_t done;
432
Jacob Shinc2837552013-06-25 22:42:37 +0200433 default_powersave_bias = powersave_bias;
Jacob Shinfb308092013-04-02 09:56:56 -0500434 cpumask_clear(&done);
435
436 get_online_cpus();
437 for_each_online_cpu(cpu) {
Rafael J. Wysocki8c8f77f2016-02-21 00:51:27 +0100438 struct cpufreq_policy *policy;
Rafael J. Wysockie40e7b22016-02-10 17:07:44 +0100439 struct policy_dbs_info *policy_dbs;
Rafael J. Wysocki8c8f77f2016-02-21 00:51:27 +0100440 struct dbs_data *dbs_data;
441 struct od_dbs_tuners *od_tuners;
Viresh Kumar44152cb2015-07-18 11:30:59 +0530442
Jacob Shinfb308092013-04-02 09:56:56 -0500443 if (cpumask_test_cpu(cpu, &done))
444 continue;
445
Rafael J. Wysocki8c8f77f2016-02-21 00:51:27 +0100446 policy = cpufreq_cpu_get_raw(cpu);
447 if (!policy || policy->governor != CPU_FREQ_GOV_ONDEMAND)
448 continue;
449
450 policy_dbs = policy->governor_data;
Rafael J. Wysockie40e7b22016-02-10 17:07:44 +0100451 if (!policy_dbs)
Jacob Shinc2837552013-06-25 22:42:37 +0200452 continue;
Jacob Shinfb308092013-04-02 09:56:56 -0500453
454 cpumask_or(&done, &done, policy->cpus);
Jacob Shinc2837552013-06-25 22:42:37 +0200455
Rafael J. Wysockibc505472016-02-07 16:24:26 +0100456 dbs_data = policy_dbs->dbs_data;
Jacob Shinc2837552013-06-25 22:42:37 +0200457 od_tuners = dbs_data->tuners;
458 od_tuners->powersave_bias = default_powersave_bias;
Jacob Shinfb308092013-04-02 09:56:56 -0500459 }
460 put_online_cpus();
461}
462
463void od_register_powersave_bias_handler(unsigned int (*f)
464 (struct cpufreq_policy *, unsigned int, unsigned int),
465 unsigned int powersave_bias)
466{
467 od_ops.powersave_bias_target = f;
468 od_set_powersave_bias(powersave_bias);
469}
470EXPORT_SYMBOL_GPL(od_register_powersave_bias_handler);
471
472void od_unregister_powersave_bias_handler(void)
473{
474 od_ops.powersave_bias_target = generic_powersave_bias_target;
475 od_set_powersave_bias(0);
476}
477EXPORT_SYMBOL_GPL(od_unregister_powersave_bias_handler);
478
Linus Torvalds1da177e2005-04-16 15:20:36 -0700479static int __init cpufreq_gov_dbs_init(void)
480{
Rafael J. Wysockiaf926182016-02-05 03:16:08 +0100481 return cpufreq_register_governor(CPU_FREQ_GOV_ONDEMAND);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700482}
483
484static void __exit cpufreq_gov_dbs_exit(void)
485{
Rafael J. Wysockiaf926182016-02-05 03:16:08 +0100486 cpufreq_unregister_governor(CPU_FREQ_GOV_ONDEMAND);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700487}
488
Venkatesh Pallipadiffac80e2006-06-28 13:52:18 -0700489MODULE_AUTHOR("Venkatesh Pallipadi <venkatesh.pallipadi@intel.com>");
490MODULE_AUTHOR("Alexey Starikovskiy <alexey.y.starikovskiy@intel.com>");
491MODULE_DESCRIPTION("'cpufreq_ondemand' - A dynamic cpufreq governor for "
Dave Jones2b03f892009-01-18 01:43:44 -0500492 "Low Latency Frequency Transition capable processors");
Venkatesh Pallipadiffac80e2006-06-28 13:52:18 -0700493MODULE_LICENSE("GPL");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700494
Johannes Weiner69157192008-01-17 15:21:08 -0800495#ifdef CONFIG_CPU_FREQ_DEFAULT_GOV_ONDEMAND
Rafael J. Wysockide1df262016-02-05 02:37:42 +0100496struct cpufreq_governor *cpufreq_default_governor(void)
497{
Rafael J. Wysockiaf926182016-02-05 03:16:08 +0100498 return CPU_FREQ_GOV_ONDEMAND;
Rafael J. Wysockide1df262016-02-05 02:37:42 +0100499}
500
Johannes Weiner69157192008-01-17 15:21:08 -0800501fs_initcall(cpufreq_gov_dbs_init);
502#else
Linus Torvalds1da177e2005-04-16 15:20:36 -0700503module_init(cpufreq_gov_dbs_init);
Johannes Weiner69157192008-01-17 15:21:08 -0800504#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700505module_exit(cpufreq_gov_dbs_exit);