blob: 03ac6ce540424a189e2946a1dd98d2046cbc3622 [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>
Viresh Kumar4471a342012-10-26 00:47:42 +020019#include "cpufreq_governor.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070020
Stratos Karafotis06eb09d2013-02-08 17:24:18 +000021/* On-demand governor macros */
Linus Torvalds1da177e2005-04-16 15:20:36 -070022#define DEF_FREQUENCY_UP_THRESHOLD (80)
David C Niemi3f78a9f2010-10-06 16:54:24 -040023#define DEF_SAMPLING_DOWN_FACTOR (1)
24#define MAX_SAMPLING_DOWN_FACTOR (100000)
venkatesh.pallipadi@intel.com80800912008-08-04 11:59:12 -070025#define MICRO_FREQUENCY_UP_THRESHOLD (95)
Thomas Renningercef96152009-04-22 13:48:29 +020026#define MICRO_FREQUENCY_MIN_SAMPLE_RATE (10000)
Dave Jonesc29f1402005-05-31 19:03:50 -070027#define MIN_FREQUENCY_UP_THRESHOLD (11)
Linus Torvalds1da177e2005-04-16 15:20:36 -070028#define MAX_FREQUENCY_UP_THRESHOLD (100)
29
Viresh Kumar4471a342012-10-26 00:47:42 +020030static DEFINE_PER_CPU(struct od_cpu_dbs_info_s, od_cpu_dbs_info);
Thomas Renninger112124a2009-02-04 11:55:12 +010031
Jacob Shinfb308092013-04-02 09:56:56 -050032static struct od_ops od_ops;
33
Fabio Baltieri3e33ee92012-11-26 18:10:12 +000034#ifndef CONFIG_CPU_FREQ_DEFAULT_GOV_ONDEMAND
35static struct cpufreq_governor cpufreq_gov_ondemand;
36#endif
37
Jacob Shinc2837552013-06-25 22:42:37 +020038static unsigned int default_powersave_bias;
39
Viresh Kumar4471a342012-10-26 00:47:42 +020040static void ondemand_powersave_bias_init_cpu(int cpu)
Arjan van de Ven6b8fcd92010-05-09 08:26:06 -070041{
Viresh Kumar4471a342012-10-26 00:47:42 +020042 struct od_cpu_dbs_info_s *dbs_info = &per_cpu(od_cpu_dbs_info, cpu);
Arjan van de Ven6b8fcd92010-05-09 08:26:06 -070043
Viresh Kumar4471a342012-10-26 00:47:42 +020044 dbs_info->freq_table = cpufreq_frequency_get_table(cpu);
45 dbs_info->freq_lo = 0;
46}
Arjan van de Ven6b8fcd92010-05-09 08:26:06 -070047
Viresh Kumar4471a342012-10-26 00:47:42 +020048/*
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.
Stratos Karafotis06eb09d2013-02-08 17:24:18 +000053 * Mike Chan (android.com) claims this is also not true for ARM.
Viresh Kumar4471a342012-10-26 00:47:42 +020054 * Because of this, whitelist specific known (series) of CPUs by default, and
55 * leave all others up to the user.
56 */
57static int should_io_be_busy(void)
58{
59#if defined(CONFIG_X86)
60 /*
Stratos Karafotis06eb09d2013-02-08 17:24:18 +000061 * For Intel, Core 2 (model 15) and later have an efficient idle.
Viresh Kumar4471a342012-10-26 00:47:42 +020062 */
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;
Arjan van de Ven6b8fcd92010-05-09 08:26:06 -070069}
70
Alexey Starikovskiy05ca0352006-07-31 22:28:12 +040071/*
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 */
Jacob Shinfb308092013-04-02 09:56:56 -050076static unsigned int generic_powersave_bias_target(struct cpufreq_policy *policy,
Viresh Kumar4471a342012-10-26 00:47:42 +020077 unsigned int freq_next, unsigned int relation)
Alexey Starikovskiy05ca0352006-07-31 22:28:12 +040078{
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;
Viresh Kumar4471a342012-10-26 00:47:42 +020083 struct od_cpu_dbs_info_s *dbs_info = &per_cpu(od_cpu_dbs_info,
Tejun Heo245b2e72009-06-24 15:13:48 +090084 policy->cpu);
Viresh Kumar4d5dcc42013-03-27 15:58:58 +000085 struct dbs_data *dbs_data = policy->governor_data;
86 struct od_dbs_tuners *od_tuners = dbs_data->tuners;
Alexey Starikovskiy05ca0352006-07-31 22:28:12 +040087
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;
Viresh Kumar4d5dcc42013-03-27 15:58:58 +000097 freq_reduc = freq_req * od_tuners->powersave_bias / 1000;
Alexey Starikovskiy05ca0352006-07-31 22:28:12 +040098 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 }
Viresh Kumar4d5dcc42013-03-27 15:58:58 +0000116 jiffies_total = usecs_to_jiffies(od_tuners->sampling_rate);
Alexey Starikovskiy05ca0352006-07-31 22:28:12 +0400117 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
127static void ondemand_powersave_bias_init(void)
128{
129 int i;
130 for_each_online_cpu(i) {
venkatesh.pallipadi@intel.com5a75c822009-07-02 17:08:32 -0700131 ondemand_powersave_bias_init_cpu(i);
Alexey Starikovskiy05ca0352006-07-31 22:28:12 +0400132 }
133}
134
Viresh Kumar3a3e9e02013-08-06 22:53:05 +0530135static void dbs_freq_increase(struct cpufreq_policy *policy, unsigned int freq)
Viresh Kumar4471a342012-10-26 00:47:42 +0200136{
Viresh Kumar3a3e9e02013-08-06 22:53:05 +0530137 struct dbs_data *dbs_data = policy->governor_data;
Viresh Kumar4d5dcc42013-03-27 15:58:58 +0000138 struct od_dbs_tuners *od_tuners = dbs_data->tuners;
139
140 if (od_tuners->powersave_bias)
Viresh Kumar3a3e9e02013-08-06 22:53:05 +0530141 freq = od_ops.powersave_bias_target(policy, freq,
Jacob Shinfb308092013-04-02 09:56:56 -0500142 CPUFREQ_RELATION_H);
Viresh Kumar3a3e9e02013-08-06 22:53:05 +0530143 else if (policy->cur == policy->max)
Viresh Kumar4471a342012-10-26 00:47:42 +0200144 return;
145
Viresh Kumar3a3e9e02013-08-06 22:53:05 +0530146 __cpufreq_driver_target(policy, freq, od_tuners->powersave_bias ?
Viresh Kumar4471a342012-10-26 00:47:42 +0200147 CPUFREQ_RELATION_L : CPUFREQ_RELATION_H);
148}
149
150/*
151 * Every sampling_rate, we check, if current idle time is less than 20%
Stratos Karafotisdfa5bb62013-06-05 19:01:25 +0300152 * (default), then we try to increase frequency. Else, we adjust the frequency
153 * proportional to load.
Viresh Kumar4471a342012-10-26 00:47:42 +0200154 */
Stratos Karafotisdfa5bb62013-06-05 19:01:25 +0300155static void od_check_cpu(int cpu, unsigned int load)
Viresh Kumar4471a342012-10-26 00:47:42 +0200156{
157 struct od_cpu_dbs_info_s *dbs_info = &per_cpu(od_cpu_dbs_info, cpu);
Viresh Kumar44152cb2015-07-18 11:30:59 +0530158 struct cpufreq_policy *policy = dbs_info->cdbs.shared->policy;
Viresh Kumar4d5dcc42013-03-27 15:58:58 +0000159 struct dbs_data *dbs_data = policy->governor_data;
160 struct od_dbs_tuners *od_tuners = dbs_data->tuners;
Viresh Kumar4471a342012-10-26 00:47:42 +0200161
162 dbs_info->freq_lo = 0;
163
164 /* Check for frequency increase */
Stratos Karafotisdfa5bb62013-06-05 19:01:25 +0300165 if (load > od_tuners->up_threshold) {
Viresh Kumar4471a342012-10-26 00:47:42 +0200166 /* If switching to max speed, apply sampling_down_factor */
167 if (policy->cur < policy->max)
168 dbs_info->rate_mult =
Viresh Kumar4d5dcc42013-03-27 15:58:58 +0000169 od_tuners->sampling_down_factor;
Viresh Kumar4471a342012-10-26 00:47:42 +0200170 dbs_freq_increase(policy, policy->max);
Stratos Karafotisdfa5bb62013-06-05 19:01:25 +0300171 } else {
172 /* Calculate the next frequency proportional to load */
Stratos Karafotis6393d6a2014-06-30 19:59:34 +0300173 unsigned int freq_next, min_f, max_f;
174
175 min_f = policy->cpuinfo.min_freq;
176 max_f = policy->cpuinfo.max_freq;
177 freq_next = min_f + load * (max_f - min_f) / 100;
Viresh Kumar4471a342012-10-26 00:47:42 +0200178
179 /* No longer fully busy, reset rate_mult */
180 dbs_info->rate_mult = 1;
181
Viresh Kumar4d5dcc42013-03-27 15:58:58 +0000182 if (!od_tuners->powersave_bias) {
Viresh Kumar4471a342012-10-26 00:47:42 +0200183 __cpufreq_driver_target(policy, freq_next,
Stratos Karafotis6393d6a2014-06-30 19:59:34 +0300184 CPUFREQ_RELATION_C);
Jacob Shinfb308092013-04-02 09:56:56 -0500185 return;
Viresh Kumar4471a342012-10-26 00:47:42 +0200186 }
Jacob Shinfb308092013-04-02 09:56:56 -0500187
188 freq_next = od_ops.powersave_bias_target(policy, freq_next,
189 CPUFREQ_RELATION_L);
Stratos Karafotis6393d6a2014-06-30 19:59:34 +0300190 __cpufreq_driver_target(policy, freq_next, CPUFREQ_RELATION_C);
Viresh Kumar4471a342012-10-26 00:47:42 +0200191 }
192}
193
Viresh Kumar43e0ee32015-07-18 11:31:00 +0530194static unsigned int od_dbs_timer(struct cpu_dbs_info *cdbs,
195 struct dbs_data *dbs_data, bool modify_all)
Fabio Baltierida53d612012-12-27 14:55:40 +0000196{
Viresh Kumar43e0ee32015-07-18 11:31:00 +0530197 struct cpufreq_policy *policy = cdbs->shared->policy;
Viresh Kumar44152cb2015-07-18 11:30:59 +0530198 unsigned int cpu = policy->cpu;
Viresh Kumar43e0ee32015-07-18 11:31:00 +0530199 struct od_cpu_dbs_info_s *dbs_info = &per_cpu(od_cpu_dbs_info,
Viresh Kumar44472662013-01-31 17:28:02 +0000200 cpu);
Viresh Kumar4d5dcc42013-03-27 15:58:58 +0000201 struct od_dbs_tuners *od_tuners = dbs_data->tuners;
Viresh Kumar43e0ee32015-07-18 11:31:00 +0530202 int delay = 0, sample_type = dbs_info->sample_type;
Fabio Baltierida53d612012-12-27 14:55:40 +0000203
Viresh Kumar43e0ee32015-07-18 11:31:00 +0530204 if (!modify_all)
Viresh Kumar9d445922013-02-27 11:06:36 +0530205 goto max_delay;
Viresh Kumar44472662013-01-31 17:28:02 +0000206
207 /* Common NORMAL_SAMPLE setup */
Viresh Kumar43e0ee32015-07-18 11:31:00 +0530208 dbs_info->sample_type = OD_NORMAL_SAMPLE;
Viresh Kumar44472662013-01-31 17:28:02 +0000209 if (sample_type == OD_SUB_SAMPLE) {
Viresh Kumar43e0ee32015-07-18 11:31:00 +0530210 delay = dbs_info->freq_lo_jiffies;
211 __cpufreq_driver_target(policy, dbs_info->freq_lo,
Viresh Kumar42994af2015-06-19 17:18:05 +0530212 CPUFREQ_RELATION_H);
Fabio Baltierida53d612012-12-27 14:55:40 +0000213 } else {
Viresh Kumar9d445922013-02-27 11:06:36 +0530214 dbs_check_cpu(dbs_data, cpu);
Viresh Kumar43e0ee32015-07-18 11:31:00 +0530215 if (dbs_info->freq_lo) {
Viresh Kumar44472662013-01-31 17:28:02 +0000216 /* Setup timer for SUB_SAMPLE */
Viresh Kumar43e0ee32015-07-18 11:31:00 +0530217 dbs_info->sample_type = OD_SUB_SAMPLE;
218 delay = dbs_info->freq_hi_jiffies;
Viresh Kumar44472662013-01-31 17:28:02 +0000219 }
Fabio Baltierida53d612012-12-27 14:55:40 +0000220 }
Viresh Kumar44472662013-01-31 17:28:02 +0000221
Viresh Kumar9d445922013-02-27 11:06:36 +0530222max_delay:
223 if (!delay)
224 delay = delay_for_sampling_rate(od_tuners->sampling_rate
Viresh Kumar43e0ee32015-07-18 11:31:00 +0530225 * dbs_info->rate_mult);
Viresh Kumar9d445922013-02-27 11:06:36 +0530226
Viresh Kumar43e0ee32015-07-18 11:31:00 +0530227 return delay;
Fabio Baltierida53d612012-12-27 14:55:40 +0000228}
229
Linus Torvalds1da177e2005-04-16 15:20:36 -0700230/************************** sysfs interface ************************/
Viresh Kumar4d5dcc42013-03-27 15:58:58 +0000231static struct common_dbs_data od_dbs_cdata;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700232
MyungJoo Hamfd0ef7a2012-02-29 17:54:41 +0900233/**
234 * update_sampling_rate - update sampling rate effective immediately if needed.
235 * @new_rate: new sampling rate
236 *
Stratos Karafotis06eb09d2013-02-08 17:24:18 +0000237 * If new rate is smaller than the old, simply updating
Viresh Kumar4471a342012-10-26 00:47:42 +0200238 * dbs_tuners_int.sampling_rate might not be appropriate. For example, if the
239 * original sampling_rate was 1 second and the requested new sampling rate is 10
240 * ms because the user needs immediate reaction from ondemand governor, but not
241 * sure if higher frequency will be required or not, then, the governor may
242 * change the sampling rate too late; up to 1 second later. Thus, if we are
243 * reducing the sampling rate, we need to make the new value effective
244 * immediately.
MyungJoo Hamfd0ef7a2012-02-29 17:54:41 +0900245 */
Viresh Kumar4d5dcc42013-03-27 15:58:58 +0000246static void update_sampling_rate(struct dbs_data *dbs_data,
247 unsigned int new_rate)
MyungJoo Hamfd0ef7a2012-02-29 17:54:41 +0900248{
Viresh Kumar4d5dcc42013-03-27 15:58:58 +0000249 struct od_dbs_tuners *od_tuners = dbs_data->tuners;
MyungJoo Hamfd0ef7a2012-02-29 17:54:41 +0900250 int cpu;
251
Viresh Kumar4d5dcc42013-03-27 15:58:58 +0000252 od_tuners->sampling_rate = new_rate = max(new_rate,
253 dbs_data->min_sampling_rate);
MyungJoo Hamfd0ef7a2012-02-29 17:54:41 +0900254
255 for_each_online_cpu(cpu) {
256 struct cpufreq_policy *policy;
Viresh Kumar4471a342012-10-26 00:47:42 +0200257 struct od_cpu_dbs_info_s *dbs_info;
MyungJoo Hamfd0ef7a2012-02-29 17:54:41 +0900258 unsigned long next_sampling, appointed_at;
259
260 policy = cpufreq_cpu_get(cpu);
261 if (!policy)
262 continue;
Fabio Baltieri3e33ee92012-11-26 18:10:12 +0000263 if (policy->governor != &cpufreq_gov_ondemand) {
264 cpufreq_cpu_put(policy);
265 continue;
266 }
Fabio Baltieri8ee2ec52012-12-27 14:55:42 +0000267 dbs_info = &per_cpu(od_cpu_dbs_info, cpu);
MyungJoo Hamfd0ef7a2012-02-29 17:54:41 +0900268 cpufreq_cpu_put(policy);
269
Viresh Kumar083701b2015-10-13 13:39:01 +0530270 if (!delayed_work_pending(&dbs_info->cdbs.dwork))
MyungJoo Hamfd0ef7a2012-02-29 17:54:41 +0900271 continue;
MyungJoo Hamfd0ef7a2012-02-29 17:54:41 +0900272
Viresh Kumar4471a342012-10-26 00:47:42 +0200273 next_sampling = jiffies + usecs_to_jiffies(new_rate);
Viresh Kumar386d46e2015-06-19 17:18:01 +0530274 appointed_at = dbs_info->cdbs.dwork.timer.expires;
MyungJoo Hamfd0ef7a2012-02-29 17:54:41 +0900275
276 if (time_before(next_sampling, appointed_at)) {
Viresh Kumar386d46e2015-06-19 17:18:01 +0530277 cancel_delayed_work_sync(&dbs_info->cdbs.dwork);
MyungJoo Hamfd0ef7a2012-02-29 17:54:41 +0900278
Viresh Kumar44152cb2015-07-18 11:30:59 +0530279 gov_queue_work(dbs_data, policy,
Viresh Kumar42994af2015-06-19 17:18:05 +0530280 usecs_to_jiffies(new_rate), true);
MyungJoo Hamfd0ef7a2012-02-29 17:54:41 +0900281
282 }
MyungJoo Hamfd0ef7a2012-02-29 17:54:41 +0900283 }
284}
285
Viresh Kumar4d5dcc42013-03-27 15:58:58 +0000286static ssize_t store_sampling_rate(struct dbs_data *dbs_data, const char *buf,
287 size_t count)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700288{
289 unsigned int input;
290 int ret;
Venkatesh Pallipadiffac80e2006-06-28 13:52:18 -0700291 ret = sscanf(buf, "%u", &input);
venkatesh.pallipadi@intel.com5a75c822009-07-02 17:08:32 -0700292 if (ret != 1)
293 return -EINVAL;
Viresh Kumar4d5dcc42013-03-27 15:58:58 +0000294
295 update_sampling_rate(dbs_data, input);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700296 return count;
297}
298
Viresh Kumar4d5dcc42013-03-27 15:58:58 +0000299static ssize_t store_io_is_busy(struct dbs_data *dbs_data, const char *buf,
300 size_t count)
Arjan van de Ven19379b12010-05-09 08:26:51 -0700301{
Viresh Kumar4d5dcc42013-03-27 15:58:58 +0000302 struct od_dbs_tuners *od_tuners = dbs_data->tuners;
Arjan van de Ven19379b12010-05-09 08:26:51 -0700303 unsigned int input;
304 int ret;
Stratos Karafotis9366d842013-02-28 16:57:32 +0000305 unsigned int j;
Arjan van de Ven19379b12010-05-09 08:26:51 -0700306
307 ret = sscanf(buf, "%u", &input);
308 if (ret != 1)
309 return -EINVAL;
Viresh Kumar4d5dcc42013-03-27 15:58:58 +0000310 od_tuners->io_is_busy = !!input;
Stratos Karafotis9366d842013-02-28 16:57:32 +0000311
312 /* we need to re-evaluate prev_cpu_idle */
313 for_each_online_cpu(j) {
314 struct od_cpu_dbs_info_s *dbs_info = &per_cpu(od_cpu_dbs_info,
315 j);
316 dbs_info->cdbs.prev_cpu_idle = get_cpu_idle_time(j,
317 &dbs_info->cdbs.prev_cpu_wall, od_tuners->io_is_busy);
318 }
Arjan van de Ven19379b12010-05-09 08:26:51 -0700319 return count;
320}
321
Viresh Kumar4d5dcc42013-03-27 15:58:58 +0000322static ssize_t store_up_threshold(struct dbs_data *dbs_data, const char *buf,
323 size_t count)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700324{
Viresh Kumar4d5dcc42013-03-27 15:58:58 +0000325 struct od_dbs_tuners *od_tuners = dbs_data->tuners;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700326 unsigned int input;
327 int ret;
Venkatesh Pallipadiffac80e2006-06-28 13:52:18 -0700328 ret = sscanf(buf, "%u", &input);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700329
Dave Jones32ee8c32006-02-28 00:43:23 -0500330 if (ret != 1 || input > MAX_FREQUENCY_UP_THRESHOLD ||
Dave Jonesc29f1402005-05-31 19:03:50 -0700331 input < MIN_FREQUENCY_UP_THRESHOLD) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700332 return -EINVAL;
333 }
Stratos Karafotis4bd4e422013-02-06 13:34:00 +0100334
Viresh Kumar4d5dcc42013-03-27 15:58:58 +0000335 od_tuners->up_threshold = input;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700336 return count;
337}
338
Viresh Kumar4d5dcc42013-03-27 15:58:58 +0000339static ssize_t store_sampling_down_factor(struct dbs_data *dbs_data,
340 const char *buf, size_t count)
David C Niemi3f78a9f2010-10-06 16:54:24 -0400341{
Viresh Kumar4d5dcc42013-03-27 15:58:58 +0000342 struct od_dbs_tuners *od_tuners = dbs_data->tuners;
David C Niemi3f78a9f2010-10-06 16:54:24 -0400343 unsigned int input, j;
344 int ret;
345 ret = sscanf(buf, "%u", &input);
346
347 if (ret != 1 || input > MAX_SAMPLING_DOWN_FACTOR || input < 1)
348 return -EINVAL;
Viresh Kumar4d5dcc42013-03-27 15:58:58 +0000349 od_tuners->sampling_down_factor = input;
David C Niemi3f78a9f2010-10-06 16:54:24 -0400350
351 /* Reset down sampling multiplier in case it was active */
352 for_each_online_cpu(j) {
Viresh Kumar4471a342012-10-26 00:47:42 +0200353 struct od_cpu_dbs_info_s *dbs_info = &per_cpu(od_cpu_dbs_info,
354 j);
David C Niemi3f78a9f2010-10-06 16:54:24 -0400355 dbs_info->rate_mult = 1;
356 }
David C Niemi3f78a9f2010-10-06 16:54:24 -0400357 return count;
358}
359
Viresh Kumar6c4640c2013-08-05 12:28:02 +0530360static ssize_t store_ignore_nice_load(struct dbs_data *dbs_data,
361 const char *buf, size_t count)
Dave Jones3d5ee9e2005-05-31 19:03:47 -0700362{
Viresh Kumar4d5dcc42013-03-27 15:58:58 +0000363 struct od_dbs_tuners *od_tuners = dbs_data->tuners;
Dave Jones3d5ee9e2005-05-31 19:03:47 -0700364 unsigned int input;
365 int ret;
366
367 unsigned int j;
Dave Jones32ee8c32006-02-28 00:43:23 -0500368
Venkatesh Pallipadiffac80e2006-06-28 13:52:18 -0700369 ret = sscanf(buf, "%u", &input);
Dave Jones2b03f892009-01-18 01:43:44 -0500370 if (ret != 1)
Dave Jones3d5ee9e2005-05-31 19:03:47 -0700371 return -EINVAL;
372
Dave Jones2b03f892009-01-18 01:43:44 -0500373 if (input > 1)
Dave Jones3d5ee9e2005-05-31 19:03:47 -0700374 input = 1;
Dave Jones32ee8c32006-02-28 00:43:23 -0500375
Viresh Kumar6c4640c2013-08-05 12:28:02 +0530376 if (input == od_tuners->ignore_nice_load) { /* nothing to do */
Dave Jones3d5ee9e2005-05-31 19:03:47 -0700377 return count;
378 }
Viresh Kumar6c4640c2013-08-05 12:28:02 +0530379 od_tuners->ignore_nice_load = input;
Dave Jones3d5ee9e2005-05-31 19:03:47 -0700380
Venkatesh Pallipadiccb2fe22006-06-28 13:49:52 -0700381 /* we need to re-evaluate prev_cpu_idle */
Dave Jonesdac1c1a2005-05-31 19:03:49 -0700382 for_each_online_cpu(j) {
Viresh Kumar4471a342012-10-26 00:47:42 +0200383 struct od_cpu_dbs_info_s *dbs_info;
Tejun Heo245b2e72009-06-24 15:13:48 +0900384 dbs_info = &per_cpu(od_cpu_dbs_info, j);
Viresh Kumar4471a342012-10-26 00:47:42 +0200385 dbs_info->cdbs.prev_cpu_idle = get_cpu_idle_time(j,
Stratos Karafotis9366d842013-02-28 16:57:32 +0000386 &dbs_info->cdbs.prev_cpu_wall, od_tuners->io_is_busy);
Viresh Kumar6c4640c2013-08-05 12:28:02 +0530387 if (od_tuners->ignore_nice_load)
Viresh Kumar4471a342012-10-26 00:47:42 +0200388 dbs_info->cdbs.prev_cpu_nice =
389 kcpustat_cpu(j).cpustat[CPUTIME_NICE];
Venkatesh Pallipadi1ca3abd2009-01-23 09:25:02 -0500390
Dave Jones3d5ee9e2005-05-31 19:03:47 -0700391 }
Dave Jones3d5ee9e2005-05-31 19:03:47 -0700392 return count;
393}
394
Viresh Kumar4d5dcc42013-03-27 15:58:58 +0000395static ssize_t store_powersave_bias(struct dbs_data *dbs_data, const char *buf,
396 size_t count)
Alexey Starikovskiy05ca0352006-07-31 22:28:12 +0400397{
Viresh Kumar4d5dcc42013-03-27 15:58:58 +0000398 struct od_dbs_tuners *od_tuners = dbs_data->tuners;
Alexey Starikovskiy05ca0352006-07-31 22:28:12 +0400399 unsigned int input;
400 int ret;
401 ret = sscanf(buf, "%u", &input);
402
403 if (ret != 1)
404 return -EINVAL;
405
406 if (input > 1000)
407 input = 1000;
408
Viresh Kumar4d5dcc42013-03-27 15:58:58 +0000409 od_tuners->powersave_bias = input;
Alexey Starikovskiy05ca0352006-07-31 22:28:12 +0400410 ondemand_powersave_bias_init();
Alexey Starikovskiy05ca0352006-07-31 22:28:12 +0400411 return count;
412}
413
Viresh Kumar4d5dcc42013-03-27 15:58:58 +0000414show_store_one(od, sampling_rate);
415show_store_one(od, io_is_busy);
416show_store_one(od, up_threshold);
417show_store_one(od, sampling_down_factor);
Viresh Kumar6c4640c2013-08-05 12:28:02 +0530418show_store_one(od, ignore_nice_load);
Viresh Kumar4d5dcc42013-03-27 15:58:58 +0000419show_store_one(od, powersave_bias);
420declare_show_sampling_rate_min(od);
Viresh Kumar4471a342012-10-26 00:47:42 +0200421
Viresh Kumar4d5dcc42013-03-27 15:58:58 +0000422gov_sys_pol_attr_rw(sampling_rate);
423gov_sys_pol_attr_rw(io_is_busy);
424gov_sys_pol_attr_rw(up_threshold);
425gov_sys_pol_attr_rw(sampling_down_factor);
Viresh Kumar6c4640c2013-08-05 12:28:02 +0530426gov_sys_pol_attr_rw(ignore_nice_load);
Viresh Kumar4d5dcc42013-03-27 15:58:58 +0000427gov_sys_pol_attr_rw(powersave_bias);
428gov_sys_pol_attr_ro(sampling_rate_min);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700429
Viresh Kumar4d5dcc42013-03-27 15:58:58 +0000430static struct attribute *dbs_attributes_gov_sys[] = {
431 &sampling_rate_min_gov_sys.attr,
432 &sampling_rate_gov_sys.attr,
433 &up_threshold_gov_sys.attr,
434 &sampling_down_factor_gov_sys.attr,
Viresh Kumar6c4640c2013-08-05 12:28:02 +0530435 &ignore_nice_load_gov_sys.attr,
Viresh Kumar4d5dcc42013-03-27 15:58:58 +0000436 &powersave_bias_gov_sys.attr,
437 &io_is_busy_gov_sys.attr,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700438 NULL
439};
440
Viresh Kumar4d5dcc42013-03-27 15:58:58 +0000441static struct attribute_group od_attr_group_gov_sys = {
442 .attrs = dbs_attributes_gov_sys,
443 .name = "ondemand",
444};
445
446static struct attribute *dbs_attributes_gov_pol[] = {
447 &sampling_rate_min_gov_pol.attr,
448 &sampling_rate_gov_pol.attr,
449 &up_threshold_gov_pol.attr,
450 &sampling_down_factor_gov_pol.attr,
Viresh Kumar6c4640c2013-08-05 12:28:02 +0530451 &ignore_nice_load_gov_pol.attr,
Viresh Kumar4d5dcc42013-03-27 15:58:58 +0000452 &powersave_bias_gov_pol.attr,
453 &io_is_busy_gov_pol.attr,
454 NULL
455};
456
457static struct attribute_group od_attr_group_gov_pol = {
458 .attrs = dbs_attributes_gov_pol,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700459 .name = "ondemand",
460};
461
462/************************** sysfs end ************************/
463
Viresh Kumar8e0484d2015-06-03 15:57:11 +0530464static int od_init(struct dbs_data *dbs_data, bool notify)
Viresh Kumar4d5dcc42013-03-27 15:58:58 +0000465{
466 struct od_dbs_tuners *tuners;
467 u64 idle_time;
468 int cpu;
469
Viresh Kumard5b73cd2013-08-06 22:53:06 +0530470 tuners = kzalloc(sizeof(*tuners), GFP_KERNEL);
Viresh Kumar4d5dcc42013-03-27 15:58:58 +0000471 if (!tuners) {
472 pr_err("%s: kzalloc failed\n", __func__);
473 return -ENOMEM;
474 }
475
476 cpu = get_cpu();
477 idle_time = get_cpu_idle_time_us(cpu, NULL);
478 put_cpu();
479 if (idle_time != -1ULL) {
480 /* Idle micro accounting is supported. Use finer thresholds */
481 tuners->up_threshold = MICRO_FREQUENCY_UP_THRESHOLD;
Viresh Kumar4d5dcc42013-03-27 15:58:58 +0000482 /*
483 * In nohz/micro accounting case we set the minimum frequency
484 * not depending on HZ, but fixed (very low). The deferred
485 * timer might skip some samples if idle/sleeping as needed.
486 */
487 dbs_data->min_sampling_rate = MICRO_FREQUENCY_MIN_SAMPLE_RATE;
488 } else {
489 tuners->up_threshold = DEF_FREQUENCY_UP_THRESHOLD;
Viresh Kumar4d5dcc42013-03-27 15:58:58 +0000490
491 /* For correct statistics, we need 10 ticks for each measure */
492 dbs_data->min_sampling_rate = MIN_SAMPLING_RATE_RATIO *
493 jiffies_to_usecs(10);
494 }
495
496 tuners->sampling_down_factor = DEF_SAMPLING_DOWN_FACTOR;
Viresh Kumar6c4640c2013-08-05 12:28:02 +0530497 tuners->ignore_nice_load = 0;
Jacob Shinc2837552013-06-25 22:42:37 +0200498 tuners->powersave_bias = default_powersave_bias;
Viresh Kumar4d5dcc42013-03-27 15:58:58 +0000499 tuners->io_is_busy = should_io_be_busy();
500
501 dbs_data->tuners = tuners;
Viresh Kumar4d5dcc42013-03-27 15:58:58 +0000502 return 0;
503}
504
Viresh Kumar8e0484d2015-06-03 15:57:11 +0530505static void od_exit(struct dbs_data *dbs_data, bool notify)
Viresh Kumar4d5dcc42013-03-27 15:58:58 +0000506{
507 kfree(dbs_data->tuners);
508}
509
Viresh Kumar4471a342012-10-26 00:47:42 +0200510define_get_cpu_dbs_routines(od_cpu_dbs_info);
Mike Chan00e299f2010-01-26 17:06:47 -0800511
Viresh Kumar4471a342012-10-26 00:47:42 +0200512static struct od_ops od_ops = {
Viresh Kumar4471a342012-10-26 00:47:42 +0200513 .powersave_bias_init_cpu = ondemand_powersave_bias_init_cpu,
Jacob Shinfb308092013-04-02 09:56:56 -0500514 .powersave_bias_target = generic_powersave_bias_target,
Viresh Kumar4471a342012-10-26 00:47:42 +0200515 .freq_increase = dbs_freq_increase,
516};
517
Viresh Kumar4d5dcc42013-03-27 15:58:58 +0000518static struct common_dbs_data od_dbs_cdata = {
Viresh Kumar4471a342012-10-26 00:47:42 +0200519 .governor = GOV_ONDEMAND,
Viresh Kumar4d5dcc42013-03-27 15:58:58 +0000520 .attr_group_gov_sys = &od_attr_group_gov_sys,
521 .attr_group_gov_pol = &od_attr_group_gov_pol,
Viresh Kumar4471a342012-10-26 00:47:42 +0200522 .get_cpu_cdbs = get_cpu_cdbs,
523 .get_cpu_dbs_info_s = get_cpu_dbs_info_s,
524 .gov_dbs_timer = od_dbs_timer,
525 .gov_check_cpu = od_check_cpu,
526 .gov_ops = &od_ops,
Viresh Kumar4d5dcc42013-03-27 15:58:58 +0000527 .init = od_init,
528 .exit = od_exit,
Viresh Kumar732b6d62015-06-03 15:57:13 +0530529 .mutex = __MUTEX_INITIALIZER(od_dbs_cdata.mutex),
Viresh Kumar4471a342012-10-26 00:47:42 +0200530};
531
Jacob Shinfb308092013-04-02 09:56:56 -0500532static void od_set_powersave_bias(unsigned int powersave_bias)
533{
534 struct cpufreq_policy *policy;
535 struct dbs_data *dbs_data;
536 struct od_dbs_tuners *od_tuners;
537 unsigned int cpu;
538 cpumask_t done;
539
Jacob Shinc2837552013-06-25 22:42:37 +0200540 default_powersave_bias = powersave_bias;
Jacob Shinfb308092013-04-02 09:56:56 -0500541 cpumask_clear(&done);
542
543 get_online_cpus();
544 for_each_online_cpu(cpu) {
Viresh Kumar44152cb2015-07-18 11:30:59 +0530545 struct cpu_common_dbs_info *shared;
546
Jacob Shinfb308092013-04-02 09:56:56 -0500547 if (cpumask_test_cpu(cpu, &done))
548 continue;
549
Viresh Kumar44152cb2015-07-18 11:30:59 +0530550 shared = per_cpu(od_cpu_dbs_info, cpu).cdbs.shared;
551 if (!shared)
Jacob Shinc2837552013-06-25 22:42:37 +0200552 continue;
Jacob Shinfb308092013-04-02 09:56:56 -0500553
Viresh Kumar44152cb2015-07-18 11:30:59 +0530554 policy = shared->policy;
Jacob Shinfb308092013-04-02 09:56:56 -0500555 cpumask_or(&done, &done, policy->cpus);
Jacob Shinc2837552013-06-25 22:42:37 +0200556
557 if (policy->governor != &cpufreq_gov_ondemand)
558 continue;
559
560 dbs_data = policy->governor_data;
561 od_tuners = dbs_data->tuners;
562 od_tuners->powersave_bias = default_powersave_bias;
Jacob Shinfb308092013-04-02 09:56:56 -0500563 }
564 put_online_cpus();
565}
566
567void od_register_powersave_bias_handler(unsigned int (*f)
568 (struct cpufreq_policy *, unsigned int, unsigned int),
569 unsigned int powersave_bias)
570{
571 od_ops.powersave_bias_target = f;
572 od_set_powersave_bias(powersave_bias);
573}
574EXPORT_SYMBOL_GPL(od_register_powersave_bias_handler);
575
576void od_unregister_powersave_bias_handler(void)
577{
578 od_ops.powersave_bias_target = generic_powersave_bias_target;
579 od_set_powersave_bias(0);
580}
581EXPORT_SYMBOL_GPL(od_unregister_powersave_bias_handler);
582
Viresh Kumar4471a342012-10-26 00:47:42 +0200583static int od_cpufreq_governor_dbs(struct cpufreq_policy *policy,
584 unsigned int event)
585{
Viresh Kumar4d5dcc42013-03-27 15:58:58 +0000586 return cpufreq_governor_dbs(policy, &od_dbs_cdata, event);
Mike Chan00e299f2010-01-26 17:06:47 -0800587}
588
Viresh Kumar4471a342012-10-26 00:47:42 +0200589#ifndef CONFIG_CPU_FREQ_DEFAULT_GOV_ONDEMAND
590static
Arjan van de Ven19379b12010-05-09 08:26:51 -0700591#endif
Viresh Kumar4471a342012-10-26 00:47:42 +0200592struct cpufreq_governor cpufreq_gov_ondemand = {
593 .name = "ondemand",
594 .governor = od_cpufreq_governor_dbs,
595 .max_transition_latency = TRANSITION_LATENCY_LIMIT,
596 .owner = THIS_MODULE,
597};
Linus Torvalds1da177e2005-04-16 15:20:36 -0700598
Linus Torvalds1da177e2005-04-16 15:20:36 -0700599static int __init cpufreq_gov_dbs_init(void)
600{
Tejun Heo57df5572011-01-26 12:12:50 +0100601 return cpufreq_register_governor(&cpufreq_gov_ondemand);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700602}
603
604static void __exit cpufreq_gov_dbs_exit(void)
605{
Thomas Renninger1c256242007-10-02 13:28:12 -0700606 cpufreq_unregister_governor(&cpufreq_gov_ondemand);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700607}
608
Venkatesh Pallipadiffac80e2006-06-28 13:52:18 -0700609MODULE_AUTHOR("Venkatesh Pallipadi <venkatesh.pallipadi@intel.com>");
610MODULE_AUTHOR("Alexey Starikovskiy <alexey.y.starikovskiy@intel.com>");
611MODULE_DESCRIPTION("'cpufreq_ondemand' - A dynamic cpufreq governor for "
Dave Jones2b03f892009-01-18 01:43:44 -0500612 "Low Latency Frequency Transition capable processors");
Venkatesh Pallipadiffac80e2006-06-28 13:52:18 -0700613MODULE_LICENSE("GPL");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700614
Johannes Weiner69157192008-01-17 15:21:08 -0800615#ifdef CONFIG_CPU_FREQ_DEFAULT_GOV_ONDEMAND
616fs_initcall(cpufreq_gov_dbs_init);
617#else
Linus Torvalds1da177e2005-04-16 15:20:36 -0700618module_init(cpufreq_gov_dbs_init);
Johannes Weiner69157192008-01-17 15:21:08 -0800619#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700620module_exit(cpufreq_gov_dbs_exit);