Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | |
Viresh Kumar | 4471a34 | 2012-10-26 00:47:42 +0200 | [diff] [blame^] | 13 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
| 14 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 15 | #include <linux/cpufreq.h> |
Viresh Kumar | 4471a34 | 2012-10-26 00:47:42 +0200 | [diff] [blame^] | 16 | #include <linux/init.h> |
| 17 | #include <linux/kernel.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 18 | #include <linux/kernel_stat.h> |
Viresh Kumar | 4471a34 | 2012-10-26 00:47:42 +0200 | [diff] [blame^] | 19 | #include <linux/kobject.h> |
| 20 | #include <linux/module.h> |
akpm@osdl.org | 3fc54d3 | 2006-01-13 15:54:22 -0800 | [diff] [blame] | 21 | #include <linux/mutex.h> |
Viresh Kumar | 4471a34 | 2012-10-26 00:47:42 +0200 | [diff] [blame^] | 22 | #include <linux/percpu-defs.h> |
| 23 | #include <linux/sysfs.h> |
venkatesh.pallipadi@intel.com | 8080091 | 2008-08-04 11:59:12 -0700 | [diff] [blame] | 24 | #include <linux/tick.h> |
Viresh Kumar | 4471a34 | 2012-10-26 00:47:42 +0200 | [diff] [blame^] | 25 | #include <linux/types.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 26 | |
Viresh Kumar | 4471a34 | 2012-10-26 00:47:42 +0200 | [diff] [blame^] | 27 | #include "cpufreq_governor.h" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 28 | |
Viresh Kumar | 4471a34 | 2012-10-26 00:47:42 +0200 | [diff] [blame^] | 29 | /* On-demand governor macors */ |
venkatesh.pallipadi@intel.com | e9d95bf | 2008-08-04 11:59:10 -0700 | [diff] [blame] | 30 | #define DEF_FREQUENCY_DOWN_DIFFERENTIAL (10) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 31 | #define DEF_FREQUENCY_UP_THRESHOLD (80) |
David C Niemi | 3f78a9f | 2010-10-06 16:54:24 -0400 | [diff] [blame] | 32 | #define DEF_SAMPLING_DOWN_FACTOR (1) |
| 33 | #define MAX_SAMPLING_DOWN_FACTOR (100000) |
venkatesh.pallipadi@intel.com | 8080091 | 2008-08-04 11:59:12 -0700 | [diff] [blame] | 34 | #define MICRO_FREQUENCY_DOWN_DIFFERENTIAL (3) |
| 35 | #define MICRO_FREQUENCY_UP_THRESHOLD (95) |
Thomas Renninger | cef9615 | 2009-04-22 13:48:29 +0200 | [diff] [blame] | 36 | #define MICRO_FREQUENCY_MIN_SAMPLE_RATE (10000) |
Dave Jones | c29f140 | 2005-05-31 19:03:50 -0700 | [diff] [blame] | 37 | #define MIN_FREQUENCY_UP_THRESHOLD (11) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 38 | #define MAX_FREQUENCY_UP_THRESHOLD (100) |
| 39 | |
Viresh Kumar | 4471a34 | 2012-10-26 00:47:42 +0200 | [diff] [blame^] | 40 | static struct dbs_data od_dbs_data; |
| 41 | static DEFINE_PER_CPU(struct od_cpu_dbs_info_s, od_cpu_dbs_info); |
Thomas Renninger | 112124a | 2009-02-04 11:55:12 +0100 | [diff] [blame] | 42 | |
Viresh Kumar | 4471a34 | 2012-10-26 00:47:42 +0200 | [diff] [blame^] | 43 | static struct od_dbs_tuners od_tuners = { |
Dave Jones | 32ee8c3 | 2006-02-28 00:43:23 -0500 | [diff] [blame] | 44 | .up_threshold = DEF_FREQUENCY_UP_THRESHOLD, |
David C Niemi | 3f78a9f | 2010-10-06 16:54:24 -0400 | [diff] [blame] | 45 | .sampling_down_factor = DEF_SAMPLING_DOWN_FACTOR, |
venkatesh.pallipadi@intel.com | e9d95bf | 2008-08-04 11:59:10 -0700 | [diff] [blame] | 46 | .down_differential = DEF_FREQUENCY_DOWN_DIFFERENTIAL, |
Eric Piel | 9cbad61 | 2006-03-10 11:35:27 +0200 | [diff] [blame] | 47 | .ignore_nice = 0, |
Alexey Starikovskiy | 05ca035 | 2006-07-31 22:28:12 +0400 | [diff] [blame] | 48 | .powersave_bias = 0, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 49 | }; |
| 50 | |
Viresh Kumar | 4471a34 | 2012-10-26 00:47:42 +0200 | [diff] [blame^] | 51 | static void ondemand_powersave_bias_init_cpu(int cpu) |
Arjan van de Ven | 6b8fcd9 | 2010-05-09 08:26:06 -0700 | [diff] [blame] | 52 | { |
Viresh Kumar | 4471a34 | 2012-10-26 00:47:42 +0200 | [diff] [blame^] | 53 | struct od_cpu_dbs_info_s *dbs_info = &per_cpu(od_cpu_dbs_info, cpu); |
Arjan van de Ven | 6b8fcd9 | 2010-05-09 08:26:06 -0700 | [diff] [blame] | 54 | |
Viresh Kumar | 4471a34 | 2012-10-26 00:47:42 +0200 | [diff] [blame^] | 55 | dbs_info->freq_table = cpufreq_frequency_get_table(cpu); |
| 56 | dbs_info->freq_lo = 0; |
| 57 | } |
Arjan van de Ven | 6b8fcd9 | 2010-05-09 08:26:06 -0700 | [diff] [blame] | 58 | |
Viresh Kumar | 4471a34 | 2012-10-26 00:47:42 +0200 | [diff] [blame^] | 59 | /* |
| 60 | * Not all CPUs want IO time to be accounted as busy; this depends on how |
| 61 | * efficient idling at a higher frequency/voltage is. |
| 62 | * Pavel Machek says this is not so for various generations of AMD and old |
| 63 | * Intel systems. |
| 64 | * Mike Chan (androidlcom) calis this is also not true for ARM. |
| 65 | * Because of this, whitelist specific known (series) of CPUs by default, and |
| 66 | * leave all others up to the user. |
| 67 | */ |
| 68 | static int should_io_be_busy(void) |
| 69 | { |
| 70 | #if defined(CONFIG_X86) |
| 71 | /* |
| 72 | * For Intel, Core 2 (model 15) andl later have an efficient idle. |
| 73 | */ |
| 74 | if (boot_cpu_data.x86_vendor == X86_VENDOR_INTEL && |
| 75 | boot_cpu_data.x86 == 6 && |
| 76 | boot_cpu_data.x86_model >= 15) |
| 77 | return 1; |
| 78 | #endif |
| 79 | return 0; |
Arjan van de Ven | 6b8fcd9 | 2010-05-09 08:26:06 -0700 | [diff] [blame] | 80 | } |
| 81 | |
Alexey Starikovskiy | 05ca035 | 2006-07-31 22:28:12 +0400 | [diff] [blame] | 82 | /* |
| 83 | * Find right freq to be set now with powersave_bias on. |
| 84 | * Returns the freq_hi to be used right now and will set freq_hi_jiffies, |
| 85 | * freq_lo, and freq_lo_jiffies in percpu area for averaging freqs. |
| 86 | */ |
Adrian Bunk | b5ecf60 | 2006-08-13 23:00:08 +0200 | [diff] [blame] | 87 | static unsigned int powersave_bias_target(struct cpufreq_policy *policy, |
Viresh Kumar | 4471a34 | 2012-10-26 00:47:42 +0200 | [diff] [blame^] | 88 | unsigned int freq_next, unsigned int relation) |
Alexey Starikovskiy | 05ca035 | 2006-07-31 22:28:12 +0400 | [diff] [blame] | 89 | { |
| 90 | unsigned int freq_req, freq_reduc, freq_avg; |
| 91 | unsigned int freq_hi, freq_lo; |
| 92 | unsigned int index = 0; |
| 93 | unsigned int jiffies_total, jiffies_hi, jiffies_lo; |
Viresh Kumar | 4471a34 | 2012-10-26 00:47:42 +0200 | [diff] [blame^] | 94 | struct od_cpu_dbs_info_s *dbs_info = &per_cpu(od_cpu_dbs_info, |
Tejun Heo | 245b2e7 | 2009-06-24 15:13:48 +0900 | [diff] [blame] | 95 | policy->cpu); |
Alexey Starikovskiy | 05ca035 | 2006-07-31 22:28:12 +0400 | [diff] [blame] | 96 | |
| 97 | if (!dbs_info->freq_table) { |
| 98 | dbs_info->freq_lo = 0; |
| 99 | dbs_info->freq_lo_jiffies = 0; |
| 100 | return freq_next; |
| 101 | } |
| 102 | |
| 103 | cpufreq_frequency_table_target(policy, dbs_info->freq_table, freq_next, |
| 104 | relation, &index); |
| 105 | freq_req = dbs_info->freq_table[index].frequency; |
Viresh Kumar | 4471a34 | 2012-10-26 00:47:42 +0200 | [diff] [blame^] | 106 | freq_reduc = freq_req * od_tuners.powersave_bias / 1000; |
Alexey Starikovskiy | 05ca035 | 2006-07-31 22:28:12 +0400 | [diff] [blame] | 107 | freq_avg = freq_req - freq_reduc; |
| 108 | |
| 109 | /* Find freq bounds for freq_avg in freq_table */ |
| 110 | index = 0; |
| 111 | cpufreq_frequency_table_target(policy, dbs_info->freq_table, freq_avg, |
| 112 | CPUFREQ_RELATION_H, &index); |
| 113 | freq_lo = dbs_info->freq_table[index].frequency; |
| 114 | index = 0; |
| 115 | cpufreq_frequency_table_target(policy, dbs_info->freq_table, freq_avg, |
| 116 | CPUFREQ_RELATION_L, &index); |
| 117 | freq_hi = dbs_info->freq_table[index].frequency; |
| 118 | |
| 119 | /* Find out how long we have to be in hi and lo freqs */ |
| 120 | if (freq_hi == freq_lo) { |
| 121 | dbs_info->freq_lo = 0; |
| 122 | dbs_info->freq_lo_jiffies = 0; |
| 123 | return freq_lo; |
| 124 | } |
Viresh Kumar | 4471a34 | 2012-10-26 00:47:42 +0200 | [diff] [blame^] | 125 | jiffies_total = usecs_to_jiffies(od_tuners.sampling_rate); |
Alexey Starikovskiy | 05ca035 | 2006-07-31 22:28:12 +0400 | [diff] [blame] | 126 | jiffies_hi = (freq_avg - freq_lo) * jiffies_total; |
| 127 | jiffies_hi += ((freq_hi - freq_lo) / 2); |
| 128 | jiffies_hi /= (freq_hi - freq_lo); |
| 129 | jiffies_lo = jiffies_total - jiffies_hi; |
| 130 | dbs_info->freq_lo = freq_lo; |
| 131 | dbs_info->freq_lo_jiffies = jiffies_lo; |
| 132 | dbs_info->freq_hi_jiffies = jiffies_hi; |
| 133 | return freq_hi; |
| 134 | } |
| 135 | |
| 136 | static void ondemand_powersave_bias_init(void) |
| 137 | { |
| 138 | int i; |
| 139 | for_each_online_cpu(i) { |
venkatesh.pallipadi@intel.com | 5a75c82 | 2009-07-02 17:08:32 -0700 | [diff] [blame] | 140 | ondemand_powersave_bias_init_cpu(i); |
Alexey Starikovskiy | 05ca035 | 2006-07-31 22:28:12 +0400 | [diff] [blame] | 141 | } |
| 142 | } |
| 143 | |
Viresh Kumar | 4471a34 | 2012-10-26 00:47:42 +0200 | [diff] [blame^] | 144 | static void dbs_freq_increase(struct cpufreq_policy *p, unsigned int freq) |
| 145 | { |
| 146 | if (od_tuners.powersave_bias) |
| 147 | freq = powersave_bias_target(p, freq, CPUFREQ_RELATION_H); |
| 148 | else if (p->cur == p->max) |
| 149 | return; |
| 150 | |
| 151 | __cpufreq_driver_target(p, freq, od_tuners.powersave_bias ? |
| 152 | CPUFREQ_RELATION_L : CPUFREQ_RELATION_H); |
| 153 | } |
| 154 | |
| 155 | /* |
| 156 | * Every sampling_rate, we check, if current idle time is less than 20% |
| 157 | * (default), then we try to increase frequency Every sampling_rate, we look for |
| 158 | * a the lowest frequency which can sustain the load while keeping idle time |
| 159 | * over 30%. If such a frequency exist, we try to decrease to this frequency. |
| 160 | * |
| 161 | * Any frequency increase takes it to the maximum frequency. Frequency reduction |
| 162 | * happens at minimum steps of 5% (default) of current frequency |
| 163 | */ |
| 164 | static void od_check_cpu(int cpu, unsigned int load_freq) |
| 165 | { |
| 166 | struct od_cpu_dbs_info_s *dbs_info = &per_cpu(od_cpu_dbs_info, cpu); |
| 167 | struct cpufreq_policy *policy = dbs_info->cdbs.cur_policy; |
| 168 | |
| 169 | dbs_info->freq_lo = 0; |
| 170 | |
| 171 | /* Check for frequency increase */ |
| 172 | if (load_freq > od_tuners.up_threshold * policy->cur) { |
| 173 | /* If switching to max speed, apply sampling_down_factor */ |
| 174 | if (policy->cur < policy->max) |
| 175 | dbs_info->rate_mult = |
| 176 | od_tuners.sampling_down_factor; |
| 177 | dbs_freq_increase(policy, policy->max); |
| 178 | return; |
| 179 | } |
| 180 | |
| 181 | /* Check for frequency decrease */ |
| 182 | /* if we cannot reduce the frequency anymore, break out early */ |
| 183 | if (policy->cur == policy->min) |
| 184 | return; |
| 185 | |
| 186 | /* |
| 187 | * The optimal frequency is the frequency that is the lowest that can |
| 188 | * support the current CPU usage without triggering the up policy. To be |
| 189 | * safe, we focus 10 points under the threshold. |
| 190 | */ |
| 191 | if (load_freq < (od_tuners.up_threshold - od_tuners.down_differential) * |
| 192 | policy->cur) { |
| 193 | unsigned int freq_next; |
| 194 | freq_next = load_freq / (od_tuners.up_threshold - |
| 195 | od_tuners.down_differential); |
| 196 | |
| 197 | /* No longer fully busy, reset rate_mult */ |
| 198 | dbs_info->rate_mult = 1; |
| 199 | |
| 200 | if (freq_next < policy->min) |
| 201 | freq_next = policy->min; |
| 202 | |
| 203 | if (!od_tuners.powersave_bias) { |
| 204 | __cpufreq_driver_target(policy, freq_next, |
| 205 | CPUFREQ_RELATION_L); |
| 206 | } else { |
| 207 | int freq = powersave_bias_target(policy, freq_next, |
| 208 | CPUFREQ_RELATION_L); |
| 209 | __cpufreq_driver_target(policy, freq, |
| 210 | CPUFREQ_RELATION_L); |
| 211 | } |
| 212 | } |
| 213 | } |
| 214 | |
| 215 | static void od_dbs_timer(struct work_struct *work) |
| 216 | { |
| 217 | struct od_cpu_dbs_info_s *dbs_info = |
| 218 | container_of(work, struct od_cpu_dbs_info_s, cdbs.work.work); |
| 219 | unsigned int cpu = dbs_info->cdbs.cpu; |
| 220 | int delay, sample_type = dbs_info->sample_type; |
| 221 | |
| 222 | mutex_lock(&dbs_info->cdbs.timer_mutex); |
| 223 | |
| 224 | /* Common NORMAL_SAMPLE setup */ |
| 225 | dbs_info->sample_type = OD_NORMAL_SAMPLE; |
| 226 | if (sample_type == OD_SUB_SAMPLE) { |
| 227 | delay = dbs_info->freq_lo_jiffies; |
| 228 | __cpufreq_driver_target(dbs_info->cdbs.cur_policy, |
| 229 | dbs_info->freq_lo, CPUFREQ_RELATION_H); |
| 230 | } else { |
| 231 | dbs_check_cpu(&od_dbs_data, cpu); |
| 232 | if (dbs_info->freq_lo) { |
| 233 | /* Setup timer for SUB_SAMPLE */ |
| 234 | dbs_info->sample_type = OD_SUB_SAMPLE; |
| 235 | delay = dbs_info->freq_hi_jiffies; |
| 236 | } else { |
| 237 | delay = delay_for_sampling_rate(dbs_info->rate_mult); |
| 238 | } |
| 239 | } |
| 240 | |
| 241 | schedule_delayed_work_on(cpu, &dbs_info->cdbs.work, delay); |
| 242 | mutex_unlock(&dbs_info->cdbs.timer_mutex); |
| 243 | } |
| 244 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 245 | /************************** sysfs interface ************************/ |
Thomas Renninger | 0e625ac | 2009-07-24 15:25:06 +0200 | [diff] [blame] | 246 | |
Thomas Renninger | 0e625ac | 2009-07-24 15:25:06 +0200 | [diff] [blame] | 247 | static ssize_t show_sampling_rate_min(struct kobject *kobj, |
| 248 | struct attribute *attr, char *buf) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 249 | { |
Viresh Kumar | 4471a34 | 2012-10-26 00:47:42 +0200 | [diff] [blame^] | 250 | return sprintf(buf, "%u\n", od_dbs_data.min_sampling_rate); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 251 | } |
| 252 | |
MyungJoo Ham | fd0ef7a | 2012-02-29 17:54:41 +0900 | [diff] [blame] | 253 | /** |
| 254 | * update_sampling_rate - update sampling rate effective immediately if needed. |
| 255 | * @new_rate: new sampling rate |
| 256 | * |
| 257 | * If new rate is smaller than the old, simply updaing |
Viresh Kumar | 4471a34 | 2012-10-26 00:47:42 +0200 | [diff] [blame^] | 258 | * dbs_tuners_int.sampling_rate might not be appropriate. For example, if the |
| 259 | * original sampling_rate was 1 second and the requested new sampling rate is 10 |
| 260 | * ms because the user needs immediate reaction from ondemand governor, but not |
| 261 | * sure if higher frequency will be required or not, then, the governor may |
| 262 | * change the sampling rate too late; up to 1 second later. Thus, if we are |
| 263 | * reducing the sampling rate, we need to make the new value effective |
| 264 | * immediately. |
MyungJoo Ham | fd0ef7a | 2012-02-29 17:54:41 +0900 | [diff] [blame] | 265 | */ |
| 266 | static void update_sampling_rate(unsigned int new_rate) |
| 267 | { |
| 268 | int cpu; |
| 269 | |
Viresh Kumar | 4471a34 | 2012-10-26 00:47:42 +0200 | [diff] [blame^] | 270 | od_tuners.sampling_rate = new_rate = max(new_rate, |
| 271 | od_dbs_data.min_sampling_rate); |
MyungJoo Ham | fd0ef7a | 2012-02-29 17:54:41 +0900 | [diff] [blame] | 272 | |
| 273 | for_each_online_cpu(cpu) { |
| 274 | struct cpufreq_policy *policy; |
Viresh Kumar | 4471a34 | 2012-10-26 00:47:42 +0200 | [diff] [blame^] | 275 | struct od_cpu_dbs_info_s *dbs_info; |
MyungJoo Ham | fd0ef7a | 2012-02-29 17:54:41 +0900 | [diff] [blame] | 276 | unsigned long next_sampling, appointed_at; |
| 277 | |
| 278 | policy = cpufreq_cpu_get(cpu); |
| 279 | if (!policy) |
| 280 | continue; |
| 281 | dbs_info = &per_cpu(od_cpu_dbs_info, policy->cpu); |
| 282 | cpufreq_cpu_put(policy); |
| 283 | |
Viresh Kumar | 4471a34 | 2012-10-26 00:47:42 +0200 | [diff] [blame^] | 284 | mutex_lock(&dbs_info->cdbs.timer_mutex); |
MyungJoo Ham | fd0ef7a | 2012-02-29 17:54:41 +0900 | [diff] [blame] | 285 | |
Viresh Kumar | 4471a34 | 2012-10-26 00:47:42 +0200 | [diff] [blame^] | 286 | if (!delayed_work_pending(&dbs_info->cdbs.work)) { |
| 287 | mutex_unlock(&dbs_info->cdbs.timer_mutex); |
MyungJoo Ham | fd0ef7a | 2012-02-29 17:54:41 +0900 | [diff] [blame] | 288 | continue; |
| 289 | } |
| 290 | |
Viresh Kumar | 4471a34 | 2012-10-26 00:47:42 +0200 | [diff] [blame^] | 291 | next_sampling = jiffies + usecs_to_jiffies(new_rate); |
| 292 | appointed_at = dbs_info->cdbs.work.timer.expires; |
MyungJoo Ham | fd0ef7a | 2012-02-29 17:54:41 +0900 | [diff] [blame] | 293 | |
| 294 | if (time_before(next_sampling, appointed_at)) { |
| 295 | |
Viresh Kumar | 4471a34 | 2012-10-26 00:47:42 +0200 | [diff] [blame^] | 296 | mutex_unlock(&dbs_info->cdbs.timer_mutex); |
| 297 | cancel_delayed_work_sync(&dbs_info->cdbs.work); |
| 298 | mutex_lock(&dbs_info->cdbs.timer_mutex); |
MyungJoo Ham | fd0ef7a | 2012-02-29 17:54:41 +0900 | [diff] [blame] | 299 | |
Viresh Kumar | 4471a34 | 2012-10-26 00:47:42 +0200 | [diff] [blame^] | 300 | schedule_delayed_work_on(dbs_info->cdbs.cpu, |
| 301 | &dbs_info->cdbs.work, |
| 302 | usecs_to_jiffies(new_rate)); |
MyungJoo Ham | fd0ef7a | 2012-02-29 17:54:41 +0900 | [diff] [blame] | 303 | |
| 304 | } |
Viresh Kumar | 4471a34 | 2012-10-26 00:47:42 +0200 | [diff] [blame^] | 305 | mutex_unlock(&dbs_info->cdbs.timer_mutex); |
MyungJoo Ham | fd0ef7a | 2012-02-29 17:54:41 +0900 | [diff] [blame] | 306 | } |
| 307 | } |
| 308 | |
Thomas Renninger | 0e625ac | 2009-07-24 15:25:06 +0200 | [diff] [blame] | 309 | static ssize_t store_sampling_rate(struct kobject *a, struct attribute *b, |
| 310 | const char *buf, size_t count) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 311 | { |
| 312 | unsigned int input; |
| 313 | int ret; |
Venkatesh Pallipadi | ffac80e | 2006-06-28 13:52:18 -0700 | [diff] [blame] | 314 | ret = sscanf(buf, "%u", &input); |
venkatesh.pallipadi@intel.com | 5a75c82 | 2009-07-02 17:08:32 -0700 | [diff] [blame] | 315 | if (ret != 1) |
| 316 | return -EINVAL; |
MyungJoo Ham | fd0ef7a | 2012-02-29 17:54:41 +0900 | [diff] [blame] | 317 | update_sampling_rate(input); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 318 | return count; |
| 319 | } |
| 320 | |
Arjan van de Ven | 19379b1 | 2010-05-09 08:26:51 -0700 | [diff] [blame] | 321 | static ssize_t store_io_is_busy(struct kobject *a, struct attribute *b, |
| 322 | const char *buf, size_t count) |
| 323 | { |
| 324 | unsigned int input; |
| 325 | int ret; |
| 326 | |
| 327 | ret = sscanf(buf, "%u", &input); |
| 328 | if (ret != 1) |
| 329 | return -EINVAL; |
Viresh Kumar | 4471a34 | 2012-10-26 00:47:42 +0200 | [diff] [blame^] | 330 | od_tuners.io_is_busy = !!input; |
Arjan van de Ven | 19379b1 | 2010-05-09 08:26:51 -0700 | [diff] [blame] | 331 | return count; |
| 332 | } |
| 333 | |
Thomas Renninger | 0e625ac | 2009-07-24 15:25:06 +0200 | [diff] [blame] | 334 | static ssize_t store_up_threshold(struct kobject *a, struct attribute *b, |
| 335 | const char *buf, size_t count) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 336 | { |
| 337 | unsigned int input; |
| 338 | int ret; |
Venkatesh Pallipadi | ffac80e | 2006-06-28 13:52:18 -0700 | [diff] [blame] | 339 | ret = sscanf(buf, "%u", &input); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 340 | |
Dave Jones | 32ee8c3 | 2006-02-28 00:43:23 -0500 | [diff] [blame] | 341 | if (ret != 1 || input > MAX_FREQUENCY_UP_THRESHOLD || |
Dave Jones | c29f140 | 2005-05-31 19:03:50 -0700 | [diff] [blame] | 342 | input < MIN_FREQUENCY_UP_THRESHOLD) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 343 | return -EINVAL; |
| 344 | } |
Viresh Kumar | 4471a34 | 2012-10-26 00:47:42 +0200 | [diff] [blame^] | 345 | od_tuners.up_threshold = input; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 346 | return count; |
| 347 | } |
| 348 | |
David C Niemi | 3f78a9f | 2010-10-06 16:54:24 -0400 | [diff] [blame] | 349 | static ssize_t store_sampling_down_factor(struct kobject *a, |
| 350 | struct attribute *b, const char *buf, size_t count) |
| 351 | { |
| 352 | unsigned int input, j; |
| 353 | int ret; |
| 354 | ret = sscanf(buf, "%u", &input); |
| 355 | |
| 356 | if (ret != 1 || input > MAX_SAMPLING_DOWN_FACTOR || input < 1) |
| 357 | return -EINVAL; |
Viresh Kumar | 4471a34 | 2012-10-26 00:47:42 +0200 | [diff] [blame^] | 358 | od_tuners.sampling_down_factor = input; |
David C Niemi | 3f78a9f | 2010-10-06 16:54:24 -0400 | [diff] [blame] | 359 | |
| 360 | /* Reset down sampling multiplier in case it was active */ |
| 361 | for_each_online_cpu(j) { |
Viresh Kumar | 4471a34 | 2012-10-26 00:47:42 +0200 | [diff] [blame^] | 362 | struct od_cpu_dbs_info_s *dbs_info = &per_cpu(od_cpu_dbs_info, |
| 363 | j); |
David C Niemi | 3f78a9f | 2010-10-06 16:54:24 -0400 | [diff] [blame] | 364 | dbs_info->rate_mult = 1; |
| 365 | } |
David C Niemi | 3f78a9f | 2010-10-06 16:54:24 -0400 | [diff] [blame] | 366 | return count; |
| 367 | } |
| 368 | |
Thomas Renninger | 0e625ac | 2009-07-24 15:25:06 +0200 | [diff] [blame] | 369 | static ssize_t store_ignore_nice_load(struct kobject *a, struct attribute *b, |
| 370 | const char *buf, size_t count) |
Dave Jones | 3d5ee9e | 2005-05-31 19:03:47 -0700 | [diff] [blame] | 371 | { |
| 372 | unsigned int input; |
| 373 | int ret; |
| 374 | |
| 375 | unsigned int j; |
Dave Jones | 32ee8c3 | 2006-02-28 00:43:23 -0500 | [diff] [blame] | 376 | |
Venkatesh Pallipadi | ffac80e | 2006-06-28 13:52:18 -0700 | [diff] [blame] | 377 | ret = sscanf(buf, "%u", &input); |
Dave Jones | 2b03f89 | 2009-01-18 01:43:44 -0500 | [diff] [blame] | 378 | if (ret != 1) |
Dave Jones | 3d5ee9e | 2005-05-31 19:03:47 -0700 | [diff] [blame] | 379 | return -EINVAL; |
| 380 | |
Dave Jones | 2b03f89 | 2009-01-18 01:43:44 -0500 | [diff] [blame] | 381 | if (input > 1) |
Dave Jones | 3d5ee9e | 2005-05-31 19:03:47 -0700 | [diff] [blame] | 382 | input = 1; |
Dave Jones | 32ee8c3 | 2006-02-28 00:43:23 -0500 | [diff] [blame] | 383 | |
Viresh Kumar | 4471a34 | 2012-10-26 00:47:42 +0200 | [diff] [blame^] | 384 | if (input == od_tuners.ignore_nice) { /* nothing to do */ |
Dave Jones | 3d5ee9e | 2005-05-31 19:03:47 -0700 | [diff] [blame] | 385 | return count; |
| 386 | } |
Viresh Kumar | 4471a34 | 2012-10-26 00:47:42 +0200 | [diff] [blame^] | 387 | od_tuners.ignore_nice = input; |
Dave Jones | 3d5ee9e | 2005-05-31 19:03:47 -0700 | [diff] [blame] | 388 | |
Venkatesh Pallipadi | ccb2fe2 | 2006-06-28 13:49:52 -0700 | [diff] [blame] | 389 | /* we need to re-evaluate prev_cpu_idle */ |
Dave Jones | dac1c1a | 2005-05-31 19:03:49 -0700 | [diff] [blame] | 390 | for_each_online_cpu(j) { |
Viresh Kumar | 4471a34 | 2012-10-26 00:47:42 +0200 | [diff] [blame^] | 391 | struct od_cpu_dbs_info_s *dbs_info; |
Tejun Heo | 245b2e7 | 2009-06-24 15:13:48 +0900 | [diff] [blame] | 392 | dbs_info = &per_cpu(od_cpu_dbs_info, j); |
Viresh Kumar | 4471a34 | 2012-10-26 00:47:42 +0200 | [diff] [blame^] | 393 | dbs_info->cdbs.prev_cpu_idle = get_cpu_idle_time(j, |
| 394 | &dbs_info->cdbs.prev_cpu_wall); |
| 395 | if (od_tuners.ignore_nice) |
| 396 | dbs_info->cdbs.prev_cpu_nice = |
| 397 | kcpustat_cpu(j).cpustat[CPUTIME_NICE]; |
Venkatesh Pallipadi | 1ca3abd | 2009-01-23 09:25:02 -0500 | [diff] [blame] | 398 | |
Dave Jones | 3d5ee9e | 2005-05-31 19:03:47 -0700 | [diff] [blame] | 399 | } |
Dave Jones | 3d5ee9e | 2005-05-31 19:03:47 -0700 | [diff] [blame] | 400 | return count; |
| 401 | } |
| 402 | |
Thomas Renninger | 0e625ac | 2009-07-24 15:25:06 +0200 | [diff] [blame] | 403 | static ssize_t store_powersave_bias(struct kobject *a, struct attribute *b, |
| 404 | const char *buf, size_t count) |
Alexey Starikovskiy | 05ca035 | 2006-07-31 22:28:12 +0400 | [diff] [blame] | 405 | { |
| 406 | unsigned int input; |
| 407 | int ret; |
| 408 | ret = sscanf(buf, "%u", &input); |
| 409 | |
| 410 | if (ret != 1) |
| 411 | return -EINVAL; |
| 412 | |
| 413 | if (input > 1000) |
| 414 | input = 1000; |
| 415 | |
Viresh Kumar | 4471a34 | 2012-10-26 00:47:42 +0200 | [diff] [blame^] | 416 | od_tuners.powersave_bias = input; |
Alexey Starikovskiy | 05ca035 | 2006-07-31 22:28:12 +0400 | [diff] [blame] | 417 | ondemand_powersave_bias_init(); |
Alexey Starikovskiy | 05ca035 | 2006-07-31 22:28:12 +0400 | [diff] [blame] | 418 | return count; |
| 419 | } |
| 420 | |
Viresh Kumar | 4471a34 | 2012-10-26 00:47:42 +0200 | [diff] [blame^] | 421 | show_one(od, sampling_rate, sampling_rate); |
| 422 | show_one(od, io_is_busy, io_is_busy); |
| 423 | show_one(od, up_threshold, up_threshold); |
| 424 | show_one(od, sampling_down_factor, sampling_down_factor); |
| 425 | show_one(od, ignore_nice_load, ignore_nice); |
| 426 | show_one(od, powersave_bias, powersave_bias); |
| 427 | |
Borislav Petkov | 6dad2a2 | 2010-03-31 21:56:46 +0200 | [diff] [blame] | 428 | define_one_global_rw(sampling_rate); |
Linus Torvalds | 07d7775 | 2010-05-18 08:49:13 -0700 | [diff] [blame] | 429 | define_one_global_rw(io_is_busy); |
Borislav Petkov | 6dad2a2 | 2010-03-31 21:56:46 +0200 | [diff] [blame] | 430 | define_one_global_rw(up_threshold); |
David C Niemi | 3f78a9f | 2010-10-06 16:54:24 -0400 | [diff] [blame] | 431 | define_one_global_rw(sampling_down_factor); |
Borislav Petkov | 6dad2a2 | 2010-03-31 21:56:46 +0200 | [diff] [blame] | 432 | define_one_global_rw(ignore_nice_load); |
| 433 | define_one_global_rw(powersave_bias); |
Viresh Kumar | 4471a34 | 2012-10-26 00:47:42 +0200 | [diff] [blame^] | 434 | define_one_global_ro(sampling_rate_min); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 435 | |
Dave Jones | 2b03f89 | 2009-01-18 01:43:44 -0500 | [diff] [blame] | 436 | static struct attribute *dbs_attributes[] = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 437 | &sampling_rate_min.attr, |
| 438 | &sampling_rate.attr, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 439 | &up_threshold.attr, |
David C Niemi | 3f78a9f | 2010-10-06 16:54:24 -0400 | [diff] [blame] | 440 | &sampling_down_factor.attr, |
Alexander Clouter | 001893c | 2005-12-01 01:09:25 -0800 | [diff] [blame] | 441 | &ignore_nice_load.attr, |
Alexey Starikovskiy | 05ca035 | 2006-07-31 22:28:12 +0400 | [diff] [blame] | 442 | &powersave_bias.attr, |
Arjan van de Ven | 19379b1 | 2010-05-09 08:26:51 -0700 | [diff] [blame] | 443 | &io_is_busy.attr, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 444 | NULL |
| 445 | }; |
| 446 | |
Viresh Kumar | 4471a34 | 2012-10-26 00:47:42 +0200 | [diff] [blame^] | 447 | static struct attribute_group od_attr_group = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 448 | .attrs = dbs_attributes, |
| 449 | .name = "ondemand", |
| 450 | }; |
| 451 | |
| 452 | /************************** sysfs end ************************/ |
| 453 | |
Viresh Kumar | 4471a34 | 2012-10-26 00:47:42 +0200 | [diff] [blame^] | 454 | define_get_cpu_dbs_routines(od_cpu_dbs_info); |
Mike Chan | 00e299f | 2010-01-26 17:06:47 -0800 | [diff] [blame] | 455 | |
Viresh Kumar | 4471a34 | 2012-10-26 00:47:42 +0200 | [diff] [blame^] | 456 | static struct od_ops od_ops = { |
| 457 | .io_busy = should_io_be_busy, |
| 458 | .powersave_bias_init_cpu = ondemand_powersave_bias_init_cpu, |
| 459 | .powersave_bias_target = powersave_bias_target, |
| 460 | .freq_increase = dbs_freq_increase, |
| 461 | }; |
| 462 | |
| 463 | static struct dbs_data od_dbs_data = { |
| 464 | .governor = GOV_ONDEMAND, |
| 465 | .attr_group = &od_attr_group, |
| 466 | .tuners = &od_tuners, |
| 467 | .get_cpu_cdbs = get_cpu_cdbs, |
| 468 | .get_cpu_dbs_info_s = get_cpu_dbs_info_s, |
| 469 | .gov_dbs_timer = od_dbs_timer, |
| 470 | .gov_check_cpu = od_check_cpu, |
| 471 | .gov_ops = &od_ops, |
| 472 | }; |
| 473 | |
| 474 | static int od_cpufreq_governor_dbs(struct cpufreq_policy *policy, |
| 475 | unsigned int event) |
| 476 | { |
| 477 | return cpufreq_governor_dbs(&od_dbs_data, policy, event); |
Mike Chan | 00e299f | 2010-01-26 17:06:47 -0800 | [diff] [blame] | 478 | } |
| 479 | |
Viresh Kumar | 4471a34 | 2012-10-26 00:47:42 +0200 | [diff] [blame^] | 480 | #ifndef CONFIG_CPU_FREQ_DEFAULT_GOV_ONDEMAND |
| 481 | static |
Arjan van de Ven | 19379b1 | 2010-05-09 08:26:51 -0700 | [diff] [blame] | 482 | #endif |
Viresh Kumar | 4471a34 | 2012-10-26 00:47:42 +0200 | [diff] [blame^] | 483 | struct cpufreq_governor cpufreq_gov_ondemand = { |
| 484 | .name = "ondemand", |
| 485 | .governor = od_cpufreq_governor_dbs, |
| 486 | .max_transition_latency = TRANSITION_LATENCY_LIMIT, |
| 487 | .owner = THIS_MODULE, |
| 488 | }; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 489 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 490 | static int __init cpufreq_gov_dbs_init(void) |
| 491 | { |
Andrea Righi | 4f6e6b9 | 2008-09-18 10:43:40 +0000 | [diff] [blame] | 492 | u64 idle_time; |
| 493 | int cpu = get_cpu(); |
venkatesh.pallipadi@intel.com | 8080091 | 2008-08-04 11:59:12 -0700 | [diff] [blame] | 494 | |
Viresh Kumar | 4471a34 | 2012-10-26 00:47:42 +0200 | [diff] [blame^] | 495 | mutex_init(&od_dbs_data.mutex); |
Kamalesh Babulal | 21f2e3c | 2011-12-09 16:18:42 +0530 | [diff] [blame] | 496 | idle_time = get_cpu_idle_time_us(cpu, NULL); |
Andrea Righi | 4f6e6b9 | 2008-09-18 10:43:40 +0000 | [diff] [blame] | 497 | put_cpu(); |
venkatesh.pallipadi@intel.com | 8080091 | 2008-08-04 11:59:12 -0700 | [diff] [blame] | 498 | if (idle_time != -1ULL) { |
| 499 | /* Idle micro accounting is supported. Use finer thresholds */ |
Viresh Kumar | 4471a34 | 2012-10-26 00:47:42 +0200 | [diff] [blame^] | 500 | od_tuners.up_threshold = MICRO_FREQUENCY_UP_THRESHOLD; |
| 501 | od_tuners.down_differential = MICRO_FREQUENCY_DOWN_DIFFERENTIAL; |
Thomas Renninger | cef9615 | 2009-04-22 13:48:29 +0200 | [diff] [blame] | 502 | /* |
Paul Bolle | bd74b32 | 2011-08-06 14:33:43 +0200 | [diff] [blame] | 503 | * In nohz/micro accounting case we set the minimum frequency |
Thomas Renninger | cef9615 | 2009-04-22 13:48:29 +0200 | [diff] [blame] | 504 | * not depending on HZ, but fixed (very low). The deferred |
| 505 | * timer might skip some samples if idle/sleeping as needed. |
| 506 | */ |
Viresh Kumar | 4471a34 | 2012-10-26 00:47:42 +0200 | [diff] [blame^] | 507 | od_dbs_data.min_sampling_rate = MICRO_FREQUENCY_MIN_SAMPLE_RATE; |
Thomas Renninger | cef9615 | 2009-04-22 13:48:29 +0200 | [diff] [blame] | 508 | } else { |
| 509 | /* For correct statistics, we need 10 ticks for each measure */ |
Viresh Kumar | 4471a34 | 2012-10-26 00:47:42 +0200 | [diff] [blame^] | 510 | od_dbs_data.min_sampling_rate = MIN_SAMPLING_RATE_RATIO * |
| 511 | jiffies_to_usecs(10); |
venkatesh.pallipadi@intel.com | 8080091 | 2008-08-04 11:59:12 -0700 | [diff] [blame] | 512 | } |
Akinobu Mita | 888a794 | 2008-07-14 12:00:45 +0900 | [diff] [blame] | 513 | |
Tejun Heo | 57df557 | 2011-01-26 12:12:50 +0100 | [diff] [blame] | 514 | return cpufreq_register_governor(&cpufreq_gov_ondemand); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 515 | } |
| 516 | |
| 517 | static void __exit cpufreq_gov_dbs_exit(void) |
| 518 | { |
Thomas Renninger | 1c25624 | 2007-10-02 13:28:12 -0700 | [diff] [blame] | 519 | cpufreq_unregister_governor(&cpufreq_gov_ondemand); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 520 | } |
| 521 | |
Venkatesh Pallipadi | ffac80e | 2006-06-28 13:52:18 -0700 | [diff] [blame] | 522 | MODULE_AUTHOR("Venkatesh Pallipadi <venkatesh.pallipadi@intel.com>"); |
| 523 | MODULE_AUTHOR("Alexey Starikovskiy <alexey.y.starikovskiy@intel.com>"); |
| 524 | MODULE_DESCRIPTION("'cpufreq_ondemand' - A dynamic cpufreq governor for " |
Dave Jones | 2b03f89 | 2009-01-18 01:43:44 -0500 | [diff] [blame] | 525 | "Low Latency Frequency Transition capable processors"); |
Venkatesh Pallipadi | ffac80e | 2006-06-28 13:52:18 -0700 | [diff] [blame] | 526 | MODULE_LICENSE("GPL"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 527 | |
Johannes Weiner | 6915719 | 2008-01-17 15:21:08 -0800 | [diff] [blame] | 528 | #ifdef CONFIG_CPU_FREQ_DEFAULT_GOV_ONDEMAND |
| 529 | fs_initcall(cpufreq_gov_dbs_init); |
| 530 | #else |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 531 | module_init(cpufreq_gov_dbs_init); |
Johannes Weiner | 6915719 | 2008-01-17 15:21:08 -0800 | [diff] [blame] | 532 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 533 | module_exit(cpufreq_gov_dbs_exit); |