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 | |
Viresh Kumar | 5ff0a26 | 2013-08-06 22:53:03 +0530 | [diff] [blame] | 15 | #include <linux/cpu.h> |
Viresh Kumar | 4471a34 | 2012-10-26 00:47:42 +0200 | [diff] [blame] | 16 | #include <linux/percpu-defs.h> |
Viresh Kumar | 4d5dcc4 | 2013-03-27 15:58:58 +0000 | [diff] [blame] | 17 | #include <linux/slab.h> |
venkatesh.pallipadi@intel.com | 8080091 | 2008-08-04 11:59:12 -0700 | [diff] [blame] | 18 | #include <linux/tick.h> |
Viresh Kumar | 4471a34 | 2012-10-26 00:47:42 +0200 | [diff] [blame] | 19 | #include "cpufreq_governor.h" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 20 | |
Stratos Karafotis | 06eb09d | 2013-02-08 17:24:18 +0000 | [diff] [blame] | 21 | /* On-demand governor macros */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 22 | #define DEF_FREQUENCY_UP_THRESHOLD (80) |
David C Niemi | 3f78a9f | 2010-10-06 16:54:24 -0400 | [diff] [blame] | 23 | #define DEF_SAMPLING_DOWN_FACTOR (1) |
| 24 | #define MAX_SAMPLING_DOWN_FACTOR (100000) |
venkatesh.pallipadi@intel.com | 8080091 | 2008-08-04 11:59:12 -0700 | [diff] [blame] | 25 | #define MICRO_FREQUENCY_UP_THRESHOLD (95) |
Thomas Renninger | cef9615 | 2009-04-22 13:48:29 +0200 | [diff] [blame] | 26 | #define MICRO_FREQUENCY_MIN_SAMPLE_RATE (10000) |
Dave Jones | c29f140 | 2005-05-31 19:03:50 -0700 | [diff] [blame] | 27 | #define MIN_FREQUENCY_UP_THRESHOLD (11) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 28 | #define MAX_FREQUENCY_UP_THRESHOLD (100) |
| 29 | |
Viresh Kumar | 4471a34 | 2012-10-26 00:47:42 +0200 | [diff] [blame] | 30 | 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] | 31 | |
Jacob Shin | fb30809 | 2013-04-02 09:56:56 -0500 | [diff] [blame] | 32 | static struct od_ops od_ops; |
| 33 | |
Jacob Shin | c283755 | 2013-06-25 22:42:37 +0200 | [diff] [blame] | 34 | static unsigned int default_powersave_bias; |
| 35 | |
Viresh Kumar | 4471a34 | 2012-10-26 00:47:42 +0200 | [diff] [blame] | 36 | static void ondemand_powersave_bias_init_cpu(int cpu) |
Arjan van de Ven | 6b8fcd9 | 2010-05-09 08:26:06 -0700 | [diff] [blame] | 37 | { |
Viresh Kumar | 4471a34 | 2012-10-26 00:47:42 +0200 | [diff] [blame] | 38 | 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] | 39 | |
Viresh Kumar | 4471a34 | 2012-10-26 00:47:42 +0200 | [diff] [blame] | 40 | dbs_info->freq_table = cpufreq_frequency_get_table(cpu); |
| 41 | dbs_info->freq_lo = 0; |
| 42 | } |
Arjan van de Ven | 6b8fcd9 | 2010-05-09 08:26:06 -0700 | [diff] [blame] | 43 | |
Viresh Kumar | 4471a34 | 2012-10-26 00:47:42 +0200 | [diff] [blame] | 44 | /* |
| 45 | * Not all CPUs want IO time to be accounted as busy; this depends on how |
| 46 | * efficient idling at a higher frequency/voltage is. |
| 47 | * Pavel Machek says this is not so for various generations of AMD and old |
| 48 | * Intel systems. |
Stratos Karafotis | 06eb09d | 2013-02-08 17:24:18 +0000 | [diff] [blame] | 49 | * Mike Chan (android.com) claims this is also not true for ARM. |
Viresh Kumar | 4471a34 | 2012-10-26 00:47:42 +0200 | [diff] [blame] | 50 | * Because of this, whitelist specific known (series) of CPUs by default, and |
| 51 | * leave all others up to the user. |
| 52 | */ |
| 53 | static int should_io_be_busy(void) |
| 54 | { |
| 55 | #if defined(CONFIG_X86) |
| 56 | /* |
Stratos Karafotis | 06eb09d | 2013-02-08 17:24:18 +0000 | [diff] [blame] | 57 | * For Intel, Core 2 (model 15) and later have an efficient idle. |
Viresh Kumar | 4471a34 | 2012-10-26 00:47:42 +0200 | [diff] [blame] | 58 | */ |
| 59 | if (boot_cpu_data.x86_vendor == X86_VENDOR_INTEL && |
| 60 | boot_cpu_data.x86 == 6 && |
| 61 | boot_cpu_data.x86_model >= 15) |
| 62 | return 1; |
| 63 | #endif |
| 64 | return 0; |
Arjan van de Ven | 6b8fcd9 | 2010-05-09 08:26:06 -0700 | [diff] [blame] | 65 | } |
| 66 | |
Alexey Starikovskiy | 05ca035 | 2006-07-31 22:28:12 +0400 | [diff] [blame] | 67 | /* |
| 68 | * Find right freq to be set now with powersave_bias on. |
| 69 | * Returns the freq_hi to be used right now and will set freq_hi_jiffies, |
| 70 | * freq_lo, and freq_lo_jiffies in percpu area for averaging freqs. |
| 71 | */ |
Jacob Shin | fb30809 | 2013-04-02 09:56:56 -0500 | [diff] [blame] | 72 | static unsigned int generic_powersave_bias_target(struct cpufreq_policy *policy, |
Viresh Kumar | 4471a34 | 2012-10-26 00:47:42 +0200 | [diff] [blame] | 73 | unsigned int freq_next, unsigned int relation) |
Alexey Starikovskiy | 05ca035 | 2006-07-31 22:28:12 +0400 | [diff] [blame] | 74 | { |
| 75 | unsigned int freq_req, freq_reduc, freq_avg; |
| 76 | unsigned int freq_hi, freq_lo; |
| 77 | unsigned int index = 0; |
| 78 | unsigned int jiffies_total, jiffies_hi, jiffies_lo; |
Viresh Kumar | 4471a34 | 2012-10-26 00:47:42 +0200 | [diff] [blame] | 79 | 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] | 80 | policy->cpu); |
Rafael J. Wysocki | bc50547 | 2016-02-07 16:24:26 +0100 | [diff] [blame] | 81 | struct policy_dbs_info *policy_dbs = policy->governor_data; |
| 82 | struct dbs_data *dbs_data = policy_dbs->dbs_data; |
Viresh Kumar | 4d5dcc4 | 2013-03-27 15:58:58 +0000 | [diff] [blame] | 83 | struct od_dbs_tuners *od_tuners = dbs_data->tuners; |
Alexey Starikovskiy | 05ca035 | 2006-07-31 22:28:12 +0400 | [diff] [blame] | 84 | |
| 85 | if (!dbs_info->freq_table) { |
| 86 | dbs_info->freq_lo = 0; |
| 87 | dbs_info->freq_lo_jiffies = 0; |
| 88 | return freq_next; |
| 89 | } |
| 90 | |
| 91 | cpufreq_frequency_table_target(policy, dbs_info->freq_table, freq_next, |
| 92 | relation, &index); |
| 93 | freq_req = dbs_info->freq_table[index].frequency; |
Viresh Kumar | 4d5dcc4 | 2013-03-27 15:58:58 +0000 | [diff] [blame] | 94 | freq_reduc = freq_req * od_tuners->powersave_bias / 1000; |
Alexey Starikovskiy | 05ca035 | 2006-07-31 22:28:12 +0400 | [diff] [blame] | 95 | freq_avg = freq_req - freq_reduc; |
| 96 | |
| 97 | /* Find freq bounds for freq_avg in freq_table */ |
| 98 | index = 0; |
| 99 | cpufreq_frequency_table_target(policy, dbs_info->freq_table, freq_avg, |
| 100 | CPUFREQ_RELATION_H, &index); |
| 101 | freq_lo = dbs_info->freq_table[index].frequency; |
| 102 | index = 0; |
| 103 | cpufreq_frequency_table_target(policy, dbs_info->freq_table, freq_avg, |
| 104 | CPUFREQ_RELATION_L, &index); |
| 105 | freq_hi = dbs_info->freq_table[index].frequency; |
| 106 | |
| 107 | /* Find out how long we have to be in hi and lo freqs */ |
| 108 | if (freq_hi == freq_lo) { |
| 109 | dbs_info->freq_lo = 0; |
| 110 | dbs_info->freq_lo_jiffies = 0; |
| 111 | return freq_lo; |
| 112 | } |
Viresh Kumar | ff4b178 | 2016-02-09 09:01:32 +0530 | [diff] [blame] | 113 | jiffies_total = usecs_to_jiffies(dbs_data->sampling_rate); |
Alexey Starikovskiy | 05ca035 | 2006-07-31 22:28:12 +0400 | [diff] [blame] | 114 | jiffies_hi = (freq_avg - freq_lo) * jiffies_total; |
| 115 | jiffies_hi += ((freq_hi - freq_lo) / 2); |
| 116 | jiffies_hi /= (freq_hi - freq_lo); |
| 117 | jiffies_lo = jiffies_total - jiffies_hi; |
| 118 | dbs_info->freq_lo = freq_lo; |
| 119 | dbs_info->freq_lo_jiffies = jiffies_lo; |
| 120 | dbs_info->freq_hi_jiffies = jiffies_hi; |
| 121 | return freq_hi; |
| 122 | } |
| 123 | |
| 124 | static void ondemand_powersave_bias_init(void) |
| 125 | { |
| 126 | int i; |
| 127 | for_each_online_cpu(i) { |
venkatesh.pallipadi@intel.com | 5a75c82 | 2009-07-02 17:08:32 -0700 | [diff] [blame] | 128 | ondemand_powersave_bias_init_cpu(i); |
Alexey Starikovskiy | 05ca035 | 2006-07-31 22:28:12 +0400 | [diff] [blame] | 129 | } |
| 130 | } |
| 131 | |
Viresh Kumar | 3a3e9e0 | 2013-08-06 22:53:05 +0530 | [diff] [blame] | 132 | static void dbs_freq_increase(struct cpufreq_policy *policy, unsigned int freq) |
Viresh Kumar | 4471a34 | 2012-10-26 00:47:42 +0200 | [diff] [blame] | 133 | { |
Rafael J. Wysocki | bc50547 | 2016-02-07 16:24:26 +0100 | [diff] [blame] | 134 | struct policy_dbs_info *policy_dbs = policy->governor_data; |
| 135 | struct dbs_data *dbs_data = policy_dbs->dbs_data; |
Viresh Kumar | 4d5dcc4 | 2013-03-27 15:58:58 +0000 | [diff] [blame] | 136 | struct od_dbs_tuners *od_tuners = dbs_data->tuners; |
| 137 | |
| 138 | if (od_tuners->powersave_bias) |
Viresh Kumar | 3a3e9e0 | 2013-08-06 22:53:05 +0530 | [diff] [blame] | 139 | freq = od_ops.powersave_bias_target(policy, freq, |
Jacob Shin | fb30809 | 2013-04-02 09:56:56 -0500 | [diff] [blame] | 140 | CPUFREQ_RELATION_H); |
Viresh Kumar | 3a3e9e0 | 2013-08-06 22:53:05 +0530 | [diff] [blame] | 141 | else if (policy->cur == policy->max) |
Viresh Kumar | 4471a34 | 2012-10-26 00:47:42 +0200 | [diff] [blame] | 142 | return; |
| 143 | |
Viresh Kumar | 3a3e9e0 | 2013-08-06 22:53:05 +0530 | [diff] [blame] | 144 | __cpufreq_driver_target(policy, freq, od_tuners->powersave_bias ? |
Viresh Kumar | 4471a34 | 2012-10-26 00:47:42 +0200 | [diff] [blame] | 145 | CPUFREQ_RELATION_L : CPUFREQ_RELATION_H); |
| 146 | } |
| 147 | |
| 148 | /* |
| 149 | * Every sampling_rate, we check, if current idle time is less than 20% |
Stratos Karafotis | dfa5bb6 | 2013-06-05 19:01:25 +0300 | [diff] [blame] | 150 | * (default), then we try to increase frequency. Else, we adjust the frequency |
| 151 | * proportional to load. |
Viresh Kumar | 4471a34 | 2012-10-26 00:47:42 +0200 | [diff] [blame] | 152 | */ |
Stratos Karafotis | dfa5bb6 | 2013-06-05 19:01:25 +0300 | [diff] [blame] | 153 | static void od_check_cpu(int cpu, unsigned int load) |
Viresh Kumar | 4471a34 | 2012-10-26 00:47:42 +0200 | [diff] [blame] | 154 | { |
| 155 | struct od_cpu_dbs_info_s *dbs_info = &per_cpu(od_cpu_dbs_info, cpu); |
Rafael J. Wysocki | bc50547 | 2016-02-07 16:24:26 +0100 | [diff] [blame] | 156 | struct policy_dbs_info *policy_dbs = dbs_info->cdbs.policy_dbs; |
| 157 | struct cpufreq_policy *policy = policy_dbs->policy; |
| 158 | struct dbs_data *dbs_data = policy_dbs->dbs_data; |
Viresh Kumar | 4d5dcc4 | 2013-03-27 15:58:58 +0000 | [diff] [blame] | 159 | struct od_dbs_tuners *od_tuners = dbs_data->tuners; |
Viresh Kumar | 4471a34 | 2012-10-26 00:47:42 +0200 | [diff] [blame] | 160 | |
| 161 | dbs_info->freq_lo = 0; |
| 162 | |
| 163 | /* Check for frequency increase */ |
Viresh Kumar | ff4b178 | 2016-02-09 09:01:32 +0530 | [diff] [blame] | 164 | if (load > dbs_data->up_threshold) { |
Viresh Kumar | 4471a34 | 2012-10-26 00:47:42 +0200 | [diff] [blame] | 165 | /* If switching to max speed, apply sampling_down_factor */ |
| 166 | if (policy->cur < policy->max) |
Viresh Kumar | ff4b178 | 2016-02-09 09:01:32 +0530 | [diff] [blame] | 167 | dbs_info->rate_mult = dbs_data->sampling_down_factor; |
Viresh Kumar | 4471a34 | 2012-10-26 00:47:42 +0200 | [diff] [blame] | 168 | dbs_freq_increase(policy, policy->max); |
Stratos Karafotis | dfa5bb6 | 2013-06-05 19:01:25 +0300 | [diff] [blame] | 169 | } else { |
| 170 | /* Calculate the next frequency proportional to load */ |
Stratos Karafotis | 6393d6a | 2014-06-30 19:59:34 +0300 | [diff] [blame] | 171 | unsigned int freq_next, min_f, max_f; |
| 172 | |
| 173 | min_f = policy->cpuinfo.min_freq; |
| 174 | max_f = policy->cpuinfo.max_freq; |
| 175 | freq_next = min_f + load * (max_f - min_f) / 100; |
Viresh Kumar | 4471a34 | 2012-10-26 00:47:42 +0200 | [diff] [blame] | 176 | |
| 177 | /* No longer fully busy, reset rate_mult */ |
| 178 | dbs_info->rate_mult = 1; |
| 179 | |
Viresh Kumar | 4d5dcc4 | 2013-03-27 15:58:58 +0000 | [diff] [blame] | 180 | if (!od_tuners->powersave_bias) { |
Viresh Kumar | 4471a34 | 2012-10-26 00:47:42 +0200 | [diff] [blame] | 181 | __cpufreq_driver_target(policy, freq_next, |
Stratos Karafotis | 6393d6a | 2014-06-30 19:59:34 +0300 | [diff] [blame] | 182 | CPUFREQ_RELATION_C); |
Jacob Shin | fb30809 | 2013-04-02 09:56:56 -0500 | [diff] [blame] | 183 | return; |
Viresh Kumar | 4471a34 | 2012-10-26 00:47:42 +0200 | [diff] [blame] | 184 | } |
Jacob Shin | fb30809 | 2013-04-02 09:56:56 -0500 | [diff] [blame] | 185 | |
| 186 | freq_next = od_ops.powersave_bias_target(policy, freq_next, |
| 187 | CPUFREQ_RELATION_L); |
Stratos Karafotis | 6393d6a | 2014-06-30 19:59:34 +0300 | [diff] [blame] | 188 | __cpufreq_driver_target(policy, freq_next, CPUFREQ_RELATION_C); |
Viresh Kumar | 4471a34 | 2012-10-26 00:47:42 +0200 | [diff] [blame] | 189 | } |
| 190 | } |
| 191 | |
Rafael J. Wysocki | 9be4fd2 | 2016-02-10 16:53:50 +0100 | [diff] [blame] | 192 | static unsigned int od_dbs_timer(struct cpufreq_policy *policy) |
Fabio Baltieri | da53d61 | 2012-12-27 14:55:40 +0000 | [diff] [blame] | 193 | { |
Rafael J. Wysocki | bc50547 | 2016-02-07 16:24:26 +0100 | [diff] [blame] | 194 | struct policy_dbs_info *policy_dbs = policy->governor_data; |
| 195 | struct dbs_data *dbs_data = policy_dbs->dbs_data; |
Rafael J. Wysocki | d10b5eb | 2016-02-06 13:50:24 +0100 | [diff] [blame] | 196 | struct od_cpu_dbs_info_s *dbs_info = &per_cpu(od_cpu_dbs_info, policy->cpu); |
Viresh Kumar | a23d6d1 | 2016-02-11 17:31:16 +0530 | [diff] [blame^] | 197 | int delay, sample_type = dbs_info->sample_type; |
Fabio Baltieri | da53d61 | 2012-12-27 14:55:40 +0000 | [diff] [blame] | 198 | |
Viresh Kumar | 4447266 | 2013-01-31 17:28:02 +0000 | [diff] [blame] | 199 | /* Common NORMAL_SAMPLE setup */ |
Viresh Kumar | 43e0ee3 | 2015-07-18 11:31:00 +0530 | [diff] [blame] | 200 | dbs_info->sample_type = OD_NORMAL_SAMPLE; |
Viresh Kumar | 4447266 | 2013-01-31 17:28:02 +0000 | [diff] [blame] | 201 | if (sample_type == OD_SUB_SAMPLE) { |
Viresh Kumar | 43e0ee3 | 2015-07-18 11:31:00 +0530 | [diff] [blame] | 202 | delay = dbs_info->freq_lo_jiffies; |
| 203 | __cpufreq_driver_target(policy, dbs_info->freq_lo, |
Viresh Kumar | 42994af | 2015-06-19 17:18:05 +0530 | [diff] [blame] | 204 | CPUFREQ_RELATION_H); |
Fabio Baltieri | da53d61 | 2012-12-27 14:55:40 +0000 | [diff] [blame] | 205 | } else { |
Rafael J. Wysocki | d10b5eb | 2016-02-06 13:50:24 +0100 | [diff] [blame] | 206 | dbs_check_cpu(policy); |
Viresh Kumar | 43e0ee3 | 2015-07-18 11:31:00 +0530 | [diff] [blame] | 207 | if (dbs_info->freq_lo) { |
Viresh Kumar | 4447266 | 2013-01-31 17:28:02 +0000 | [diff] [blame] | 208 | /* Setup timer for SUB_SAMPLE */ |
Viresh Kumar | 43e0ee3 | 2015-07-18 11:31:00 +0530 | [diff] [blame] | 209 | dbs_info->sample_type = OD_SUB_SAMPLE; |
| 210 | delay = dbs_info->freq_hi_jiffies; |
Viresh Kumar | a23d6d1 | 2016-02-11 17:31:16 +0530 | [diff] [blame^] | 211 | } else { |
| 212 | delay = delay_for_sampling_rate(dbs_data->sampling_rate |
| 213 | * dbs_info->rate_mult); |
Viresh Kumar | 4447266 | 2013-01-31 17:28:02 +0000 | [diff] [blame] | 214 | } |
Fabio Baltieri | da53d61 | 2012-12-27 14:55:40 +0000 | [diff] [blame] | 215 | } |
Viresh Kumar | 4447266 | 2013-01-31 17:28:02 +0000 | [diff] [blame] | 216 | |
Viresh Kumar | 43e0ee3 | 2015-07-18 11:31:00 +0530 | [diff] [blame] | 217 | return delay; |
Fabio Baltieri | da53d61 | 2012-12-27 14:55:40 +0000 | [diff] [blame] | 218 | } |
| 219 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 220 | /************************** sysfs interface ************************/ |
Rafael J. Wysocki | 7bdad34 | 2016-02-07 16:05:07 +0100 | [diff] [blame] | 221 | static struct dbs_governor od_dbs_gov; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 222 | |
Viresh Kumar | 4d5dcc4 | 2013-03-27 15:58:58 +0000 | [diff] [blame] | 223 | static ssize_t store_io_is_busy(struct dbs_data *dbs_data, const char *buf, |
| 224 | size_t count) |
Arjan van de Ven | 19379b1 | 2010-05-09 08:26:51 -0700 | [diff] [blame] | 225 | { |
Viresh Kumar | 4d5dcc4 | 2013-03-27 15:58:58 +0000 | [diff] [blame] | 226 | struct od_dbs_tuners *od_tuners = dbs_data->tuners; |
Arjan van de Ven | 19379b1 | 2010-05-09 08:26:51 -0700 | [diff] [blame] | 227 | unsigned int input; |
| 228 | int ret; |
Stratos Karafotis | 9366d84 | 2013-02-28 16:57:32 +0000 | [diff] [blame] | 229 | unsigned int j; |
Arjan van de Ven | 19379b1 | 2010-05-09 08:26:51 -0700 | [diff] [blame] | 230 | |
| 231 | ret = sscanf(buf, "%u", &input); |
| 232 | if (ret != 1) |
| 233 | return -EINVAL; |
Viresh Kumar | 4d5dcc4 | 2013-03-27 15:58:58 +0000 | [diff] [blame] | 234 | od_tuners->io_is_busy = !!input; |
Stratos Karafotis | 9366d84 | 2013-02-28 16:57:32 +0000 | [diff] [blame] | 235 | |
| 236 | /* we need to re-evaluate prev_cpu_idle */ |
| 237 | for_each_online_cpu(j) { |
| 238 | struct od_cpu_dbs_info_s *dbs_info = &per_cpu(od_cpu_dbs_info, |
| 239 | j); |
| 240 | dbs_info->cdbs.prev_cpu_idle = get_cpu_idle_time(j, |
| 241 | &dbs_info->cdbs.prev_cpu_wall, od_tuners->io_is_busy); |
| 242 | } |
Arjan van de Ven | 19379b1 | 2010-05-09 08:26:51 -0700 | [diff] [blame] | 243 | return count; |
| 244 | } |
| 245 | |
Viresh Kumar | 4d5dcc4 | 2013-03-27 15:58:58 +0000 | [diff] [blame] | 246 | static ssize_t store_up_threshold(struct dbs_data *dbs_data, const char *buf, |
| 247 | size_t count) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 248 | { |
| 249 | unsigned int input; |
| 250 | int ret; |
Venkatesh Pallipadi | ffac80e | 2006-06-28 13:52:18 -0700 | [diff] [blame] | 251 | ret = sscanf(buf, "%u", &input); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 252 | |
Dave Jones | 32ee8c3 | 2006-02-28 00:43:23 -0500 | [diff] [blame] | 253 | if (ret != 1 || input > MAX_FREQUENCY_UP_THRESHOLD || |
Dave Jones | c29f140 | 2005-05-31 19:03:50 -0700 | [diff] [blame] | 254 | input < MIN_FREQUENCY_UP_THRESHOLD) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 255 | return -EINVAL; |
| 256 | } |
Stratos Karafotis | 4bd4e42 | 2013-02-06 13:34:00 +0100 | [diff] [blame] | 257 | |
Viresh Kumar | ff4b178 | 2016-02-09 09:01:32 +0530 | [diff] [blame] | 258 | dbs_data->up_threshold = input; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 259 | return count; |
| 260 | } |
| 261 | |
Viresh Kumar | 4d5dcc4 | 2013-03-27 15:58:58 +0000 | [diff] [blame] | 262 | static ssize_t store_sampling_down_factor(struct dbs_data *dbs_data, |
| 263 | const char *buf, size_t count) |
David C Niemi | 3f78a9f | 2010-10-06 16:54:24 -0400 | [diff] [blame] | 264 | { |
| 265 | unsigned int input, j; |
| 266 | int ret; |
| 267 | ret = sscanf(buf, "%u", &input); |
| 268 | |
| 269 | if (ret != 1 || input > MAX_SAMPLING_DOWN_FACTOR || input < 1) |
| 270 | return -EINVAL; |
Viresh Kumar | ff4b178 | 2016-02-09 09:01:32 +0530 | [diff] [blame] | 271 | dbs_data->sampling_down_factor = input; |
David C Niemi | 3f78a9f | 2010-10-06 16:54:24 -0400 | [diff] [blame] | 272 | |
| 273 | /* Reset down sampling multiplier in case it was active */ |
| 274 | for_each_online_cpu(j) { |
Viresh Kumar | 4471a34 | 2012-10-26 00:47:42 +0200 | [diff] [blame] | 275 | struct od_cpu_dbs_info_s *dbs_info = &per_cpu(od_cpu_dbs_info, |
| 276 | j); |
David C Niemi | 3f78a9f | 2010-10-06 16:54:24 -0400 | [diff] [blame] | 277 | dbs_info->rate_mult = 1; |
| 278 | } |
David C Niemi | 3f78a9f | 2010-10-06 16:54:24 -0400 | [diff] [blame] | 279 | return count; |
| 280 | } |
| 281 | |
Viresh Kumar | 6c4640c | 2013-08-05 12:28:02 +0530 | [diff] [blame] | 282 | static ssize_t store_ignore_nice_load(struct dbs_data *dbs_data, |
| 283 | const char *buf, size_t count) |
Dave Jones | 3d5ee9e | 2005-05-31 19:03:47 -0700 | [diff] [blame] | 284 | { |
Viresh Kumar | 4d5dcc4 | 2013-03-27 15:58:58 +0000 | [diff] [blame] | 285 | struct od_dbs_tuners *od_tuners = dbs_data->tuners; |
Dave Jones | 3d5ee9e | 2005-05-31 19:03:47 -0700 | [diff] [blame] | 286 | unsigned int input; |
| 287 | int ret; |
| 288 | |
| 289 | unsigned int j; |
Dave Jones | 32ee8c3 | 2006-02-28 00:43:23 -0500 | [diff] [blame] | 290 | |
Venkatesh Pallipadi | ffac80e | 2006-06-28 13:52:18 -0700 | [diff] [blame] | 291 | ret = sscanf(buf, "%u", &input); |
Dave Jones | 2b03f89 | 2009-01-18 01:43:44 -0500 | [diff] [blame] | 292 | if (ret != 1) |
Dave Jones | 3d5ee9e | 2005-05-31 19:03:47 -0700 | [diff] [blame] | 293 | return -EINVAL; |
| 294 | |
Dave Jones | 2b03f89 | 2009-01-18 01:43:44 -0500 | [diff] [blame] | 295 | if (input > 1) |
Dave Jones | 3d5ee9e | 2005-05-31 19:03:47 -0700 | [diff] [blame] | 296 | input = 1; |
Dave Jones | 32ee8c3 | 2006-02-28 00:43:23 -0500 | [diff] [blame] | 297 | |
Viresh Kumar | ff4b178 | 2016-02-09 09:01:32 +0530 | [diff] [blame] | 298 | if (input == dbs_data->ignore_nice_load) { /* nothing to do */ |
Dave Jones | 3d5ee9e | 2005-05-31 19:03:47 -0700 | [diff] [blame] | 299 | return count; |
| 300 | } |
Viresh Kumar | ff4b178 | 2016-02-09 09:01:32 +0530 | [diff] [blame] | 301 | dbs_data->ignore_nice_load = input; |
Dave Jones | 3d5ee9e | 2005-05-31 19:03:47 -0700 | [diff] [blame] | 302 | |
Venkatesh Pallipadi | ccb2fe2 | 2006-06-28 13:49:52 -0700 | [diff] [blame] | 303 | /* we need to re-evaluate prev_cpu_idle */ |
Dave Jones | dac1c1a | 2005-05-31 19:03:49 -0700 | [diff] [blame] | 304 | for_each_online_cpu(j) { |
Viresh Kumar | 4471a34 | 2012-10-26 00:47:42 +0200 | [diff] [blame] | 305 | struct od_cpu_dbs_info_s *dbs_info; |
Tejun Heo | 245b2e7 | 2009-06-24 15:13:48 +0900 | [diff] [blame] | 306 | dbs_info = &per_cpu(od_cpu_dbs_info, j); |
Viresh Kumar | 4471a34 | 2012-10-26 00:47:42 +0200 | [diff] [blame] | 307 | dbs_info->cdbs.prev_cpu_idle = get_cpu_idle_time(j, |
Stratos Karafotis | 9366d84 | 2013-02-28 16:57:32 +0000 | [diff] [blame] | 308 | &dbs_info->cdbs.prev_cpu_wall, od_tuners->io_is_busy); |
Viresh Kumar | ff4b178 | 2016-02-09 09:01:32 +0530 | [diff] [blame] | 309 | if (dbs_data->ignore_nice_load) |
Viresh Kumar | 4471a34 | 2012-10-26 00:47:42 +0200 | [diff] [blame] | 310 | dbs_info->cdbs.prev_cpu_nice = |
| 311 | kcpustat_cpu(j).cpustat[CPUTIME_NICE]; |
Venkatesh Pallipadi | 1ca3abd | 2009-01-23 09:25:02 -0500 | [diff] [blame] | 312 | |
Dave Jones | 3d5ee9e | 2005-05-31 19:03:47 -0700 | [diff] [blame] | 313 | } |
Dave Jones | 3d5ee9e | 2005-05-31 19:03:47 -0700 | [diff] [blame] | 314 | return count; |
| 315 | } |
| 316 | |
Viresh Kumar | 4d5dcc4 | 2013-03-27 15:58:58 +0000 | [diff] [blame] | 317 | static ssize_t store_powersave_bias(struct dbs_data *dbs_data, const char *buf, |
| 318 | size_t count) |
Alexey Starikovskiy | 05ca035 | 2006-07-31 22:28:12 +0400 | [diff] [blame] | 319 | { |
Viresh Kumar | 4d5dcc4 | 2013-03-27 15:58:58 +0000 | [diff] [blame] | 320 | struct od_dbs_tuners *od_tuners = dbs_data->tuners; |
Alexey Starikovskiy | 05ca035 | 2006-07-31 22:28:12 +0400 | [diff] [blame] | 321 | unsigned int input; |
| 322 | int ret; |
| 323 | ret = sscanf(buf, "%u", &input); |
| 324 | |
| 325 | if (ret != 1) |
| 326 | return -EINVAL; |
| 327 | |
| 328 | if (input > 1000) |
| 329 | input = 1000; |
| 330 | |
Viresh Kumar | 4d5dcc4 | 2013-03-27 15:58:58 +0000 | [diff] [blame] | 331 | od_tuners->powersave_bias = input; |
Alexey Starikovskiy | 05ca035 | 2006-07-31 22:28:12 +0400 | [diff] [blame] | 332 | ondemand_powersave_bias_init(); |
Alexey Starikovskiy | 05ca035 | 2006-07-31 22:28:12 +0400 | [diff] [blame] | 333 | return count; |
| 334 | } |
| 335 | |
Viresh Kumar | c443563 | 2016-02-09 09:01:33 +0530 | [diff] [blame] | 336 | gov_show_one_common(sampling_rate); |
| 337 | gov_show_one_common(up_threshold); |
| 338 | gov_show_one_common(sampling_down_factor); |
| 339 | gov_show_one_common(ignore_nice_load); |
| 340 | gov_show_one_common(min_sampling_rate); |
| 341 | gov_show_one(od, io_is_busy); |
| 342 | gov_show_one(od, powersave_bias); |
Viresh Kumar | 4471a34 | 2012-10-26 00:47:42 +0200 | [diff] [blame] | 343 | |
Viresh Kumar | c443563 | 2016-02-09 09:01:33 +0530 | [diff] [blame] | 344 | gov_attr_rw(sampling_rate); |
| 345 | gov_attr_rw(io_is_busy); |
| 346 | gov_attr_rw(up_threshold); |
| 347 | gov_attr_rw(sampling_down_factor); |
| 348 | gov_attr_rw(ignore_nice_load); |
| 349 | gov_attr_rw(powersave_bias); |
| 350 | gov_attr_ro(min_sampling_rate); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 351 | |
Viresh Kumar | c443563 | 2016-02-09 09:01:33 +0530 | [diff] [blame] | 352 | static struct attribute *od_attributes[] = { |
| 353 | &min_sampling_rate.attr, |
| 354 | &sampling_rate.attr, |
| 355 | &up_threshold.attr, |
| 356 | &sampling_down_factor.attr, |
| 357 | &ignore_nice_load.attr, |
| 358 | &powersave_bias.attr, |
| 359 | &io_is_busy.attr, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 360 | NULL |
| 361 | }; |
| 362 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 363 | /************************** sysfs end ************************/ |
| 364 | |
Viresh Kumar | 8e0484d | 2015-06-03 15:57:11 +0530 | [diff] [blame] | 365 | static int od_init(struct dbs_data *dbs_data, bool notify) |
Viresh Kumar | 4d5dcc4 | 2013-03-27 15:58:58 +0000 | [diff] [blame] | 366 | { |
| 367 | struct od_dbs_tuners *tuners; |
| 368 | u64 idle_time; |
| 369 | int cpu; |
| 370 | |
Viresh Kumar | d5b73cd | 2013-08-06 22:53:06 +0530 | [diff] [blame] | 371 | tuners = kzalloc(sizeof(*tuners), GFP_KERNEL); |
Viresh Kumar | 4d5dcc4 | 2013-03-27 15:58:58 +0000 | [diff] [blame] | 372 | if (!tuners) { |
| 373 | pr_err("%s: kzalloc failed\n", __func__); |
| 374 | return -ENOMEM; |
| 375 | } |
| 376 | |
| 377 | cpu = get_cpu(); |
| 378 | idle_time = get_cpu_idle_time_us(cpu, NULL); |
| 379 | put_cpu(); |
| 380 | if (idle_time != -1ULL) { |
| 381 | /* Idle micro accounting is supported. Use finer thresholds */ |
Viresh Kumar | ff4b178 | 2016-02-09 09:01:32 +0530 | [diff] [blame] | 382 | dbs_data->up_threshold = MICRO_FREQUENCY_UP_THRESHOLD; |
Viresh Kumar | 4d5dcc4 | 2013-03-27 15:58:58 +0000 | [diff] [blame] | 383 | /* |
| 384 | * In nohz/micro accounting case we set the minimum frequency |
| 385 | * not depending on HZ, but fixed (very low). The deferred |
| 386 | * timer might skip some samples if idle/sleeping as needed. |
| 387 | */ |
| 388 | dbs_data->min_sampling_rate = MICRO_FREQUENCY_MIN_SAMPLE_RATE; |
| 389 | } else { |
Viresh Kumar | ff4b178 | 2016-02-09 09:01:32 +0530 | [diff] [blame] | 390 | dbs_data->up_threshold = DEF_FREQUENCY_UP_THRESHOLD; |
Viresh Kumar | 4d5dcc4 | 2013-03-27 15:58:58 +0000 | [diff] [blame] | 391 | |
| 392 | /* For correct statistics, we need 10 ticks for each measure */ |
| 393 | dbs_data->min_sampling_rate = MIN_SAMPLING_RATE_RATIO * |
| 394 | jiffies_to_usecs(10); |
| 395 | } |
| 396 | |
Viresh Kumar | ff4b178 | 2016-02-09 09:01:32 +0530 | [diff] [blame] | 397 | dbs_data->sampling_down_factor = DEF_SAMPLING_DOWN_FACTOR; |
| 398 | dbs_data->ignore_nice_load = 0; |
Jacob Shin | c283755 | 2013-06-25 22:42:37 +0200 | [diff] [blame] | 399 | tuners->powersave_bias = default_powersave_bias; |
Viresh Kumar | 4d5dcc4 | 2013-03-27 15:58:58 +0000 | [diff] [blame] | 400 | tuners->io_is_busy = should_io_be_busy(); |
| 401 | |
| 402 | dbs_data->tuners = tuners; |
Viresh Kumar | 4d5dcc4 | 2013-03-27 15:58:58 +0000 | [diff] [blame] | 403 | return 0; |
| 404 | } |
| 405 | |
Viresh Kumar | 8e0484d | 2015-06-03 15:57:11 +0530 | [diff] [blame] | 406 | static void od_exit(struct dbs_data *dbs_data, bool notify) |
Viresh Kumar | 4d5dcc4 | 2013-03-27 15:58:58 +0000 | [diff] [blame] | 407 | { |
| 408 | kfree(dbs_data->tuners); |
| 409 | } |
| 410 | |
Viresh Kumar | 4471a34 | 2012-10-26 00:47:42 +0200 | [diff] [blame] | 411 | define_get_cpu_dbs_routines(od_cpu_dbs_info); |
Mike Chan | 00e299f | 2010-01-26 17:06:47 -0800 | [diff] [blame] | 412 | |
Viresh Kumar | 4471a34 | 2012-10-26 00:47:42 +0200 | [diff] [blame] | 413 | static struct od_ops od_ops = { |
Viresh Kumar | 4471a34 | 2012-10-26 00:47:42 +0200 | [diff] [blame] | 414 | .powersave_bias_init_cpu = ondemand_powersave_bias_init_cpu, |
Jacob Shin | fb30809 | 2013-04-02 09:56:56 -0500 | [diff] [blame] | 415 | .powersave_bias_target = generic_powersave_bias_target, |
Viresh Kumar | 4471a34 | 2012-10-26 00:47:42 +0200 | [diff] [blame] | 416 | .freq_increase = dbs_freq_increase, |
| 417 | }; |
| 418 | |
Rafael J. Wysocki | 7bdad34 | 2016-02-07 16:05:07 +0100 | [diff] [blame] | 419 | static struct dbs_governor od_dbs_gov = { |
Rafael J. Wysocki | af92618 | 2016-02-05 03:16:08 +0100 | [diff] [blame] | 420 | .gov = { |
| 421 | .name = "ondemand", |
Rafael J. Wysocki | 906a6e5 | 2016-02-07 16:07:51 +0100 | [diff] [blame] | 422 | .governor = cpufreq_governor_dbs, |
Rafael J. Wysocki | af92618 | 2016-02-05 03:16:08 +0100 | [diff] [blame] | 423 | .max_transition_latency = TRANSITION_LATENCY_LIMIT, |
| 424 | .owner = THIS_MODULE, |
| 425 | }, |
Viresh Kumar | 4471a34 | 2012-10-26 00:47:42 +0200 | [diff] [blame] | 426 | .governor = GOV_ONDEMAND, |
Viresh Kumar | c443563 | 2016-02-09 09:01:33 +0530 | [diff] [blame] | 427 | .kobj_type = { .default_attrs = od_attributes }, |
Viresh Kumar | 4471a34 | 2012-10-26 00:47:42 +0200 | [diff] [blame] | 428 | .get_cpu_cdbs = get_cpu_cdbs, |
| 429 | .get_cpu_dbs_info_s = get_cpu_dbs_info_s, |
| 430 | .gov_dbs_timer = od_dbs_timer, |
| 431 | .gov_check_cpu = od_check_cpu, |
| 432 | .gov_ops = &od_ops, |
Viresh Kumar | 4d5dcc4 | 2013-03-27 15:58:58 +0000 | [diff] [blame] | 433 | .init = od_init, |
| 434 | .exit = od_exit, |
Viresh Kumar | 4471a34 | 2012-10-26 00:47:42 +0200 | [diff] [blame] | 435 | }; |
| 436 | |
Rafael J. Wysocki | 7bdad34 | 2016-02-07 16:05:07 +0100 | [diff] [blame] | 437 | #define CPU_FREQ_GOV_ONDEMAND (&od_dbs_gov.gov) |
Rafael J. Wysocki | af92618 | 2016-02-05 03:16:08 +0100 | [diff] [blame] | 438 | |
Jacob Shin | fb30809 | 2013-04-02 09:56:56 -0500 | [diff] [blame] | 439 | static void od_set_powersave_bias(unsigned int powersave_bias) |
| 440 | { |
| 441 | struct cpufreq_policy *policy; |
| 442 | struct dbs_data *dbs_data; |
| 443 | struct od_dbs_tuners *od_tuners; |
| 444 | unsigned int cpu; |
| 445 | cpumask_t done; |
| 446 | |
Jacob Shin | c283755 | 2013-06-25 22:42:37 +0200 | [diff] [blame] | 447 | default_powersave_bias = powersave_bias; |
Jacob Shin | fb30809 | 2013-04-02 09:56:56 -0500 | [diff] [blame] | 448 | cpumask_clear(&done); |
| 449 | |
| 450 | get_online_cpus(); |
| 451 | for_each_online_cpu(cpu) { |
Rafael J. Wysocki | e40e7b2 | 2016-02-10 17:07:44 +0100 | [diff] [blame] | 452 | struct policy_dbs_info *policy_dbs; |
Viresh Kumar | 44152cb | 2015-07-18 11:30:59 +0530 | [diff] [blame] | 453 | |
Jacob Shin | fb30809 | 2013-04-02 09:56:56 -0500 | [diff] [blame] | 454 | if (cpumask_test_cpu(cpu, &done)) |
| 455 | continue; |
| 456 | |
Rafael J. Wysocki | e40e7b2 | 2016-02-10 17:07:44 +0100 | [diff] [blame] | 457 | policy_dbs = per_cpu(od_cpu_dbs_info, cpu).cdbs.policy_dbs; |
| 458 | if (!policy_dbs) |
Jacob Shin | c283755 | 2013-06-25 22:42:37 +0200 | [diff] [blame] | 459 | continue; |
Jacob Shin | fb30809 | 2013-04-02 09:56:56 -0500 | [diff] [blame] | 460 | |
Rafael J. Wysocki | e40e7b2 | 2016-02-10 17:07:44 +0100 | [diff] [blame] | 461 | policy = policy_dbs->policy; |
Jacob Shin | fb30809 | 2013-04-02 09:56:56 -0500 | [diff] [blame] | 462 | cpumask_or(&done, &done, policy->cpus); |
Jacob Shin | c283755 | 2013-06-25 22:42:37 +0200 | [diff] [blame] | 463 | |
Rafael J. Wysocki | af92618 | 2016-02-05 03:16:08 +0100 | [diff] [blame] | 464 | if (policy->governor != CPU_FREQ_GOV_ONDEMAND) |
Jacob Shin | c283755 | 2013-06-25 22:42:37 +0200 | [diff] [blame] | 465 | continue; |
| 466 | |
Rafael J. Wysocki | bc50547 | 2016-02-07 16:24:26 +0100 | [diff] [blame] | 467 | dbs_data = policy_dbs->dbs_data; |
Jacob Shin | c283755 | 2013-06-25 22:42:37 +0200 | [diff] [blame] | 468 | od_tuners = dbs_data->tuners; |
| 469 | od_tuners->powersave_bias = default_powersave_bias; |
Jacob Shin | fb30809 | 2013-04-02 09:56:56 -0500 | [diff] [blame] | 470 | } |
| 471 | put_online_cpus(); |
| 472 | } |
| 473 | |
| 474 | void od_register_powersave_bias_handler(unsigned int (*f) |
| 475 | (struct cpufreq_policy *, unsigned int, unsigned int), |
| 476 | unsigned int powersave_bias) |
| 477 | { |
| 478 | od_ops.powersave_bias_target = f; |
| 479 | od_set_powersave_bias(powersave_bias); |
| 480 | } |
| 481 | EXPORT_SYMBOL_GPL(od_register_powersave_bias_handler); |
| 482 | |
| 483 | void od_unregister_powersave_bias_handler(void) |
| 484 | { |
| 485 | od_ops.powersave_bias_target = generic_powersave_bias_target; |
| 486 | od_set_powersave_bias(0); |
| 487 | } |
| 488 | EXPORT_SYMBOL_GPL(od_unregister_powersave_bias_handler); |
| 489 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 490 | static int __init cpufreq_gov_dbs_init(void) |
| 491 | { |
Rafael J. Wysocki | af92618 | 2016-02-05 03:16:08 +0100 | [diff] [blame] | 492 | return cpufreq_register_governor(CPU_FREQ_GOV_ONDEMAND); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 493 | } |
| 494 | |
| 495 | static void __exit cpufreq_gov_dbs_exit(void) |
| 496 | { |
Rafael J. Wysocki | af92618 | 2016-02-05 03:16:08 +0100 | [diff] [blame] | 497 | cpufreq_unregister_governor(CPU_FREQ_GOV_ONDEMAND); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 498 | } |
| 499 | |
Venkatesh Pallipadi | ffac80e | 2006-06-28 13:52:18 -0700 | [diff] [blame] | 500 | MODULE_AUTHOR("Venkatesh Pallipadi <venkatesh.pallipadi@intel.com>"); |
| 501 | MODULE_AUTHOR("Alexey Starikovskiy <alexey.y.starikovskiy@intel.com>"); |
| 502 | MODULE_DESCRIPTION("'cpufreq_ondemand' - A dynamic cpufreq governor for " |
Dave Jones | 2b03f89 | 2009-01-18 01:43:44 -0500 | [diff] [blame] | 503 | "Low Latency Frequency Transition capable processors"); |
Venkatesh Pallipadi | ffac80e | 2006-06-28 13:52:18 -0700 | [diff] [blame] | 504 | MODULE_LICENSE("GPL"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 505 | |
Johannes Weiner | 6915719 | 2008-01-17 15:21:08 -0800 | [diff] [blame] | 506 | #ifdef CONFIG_CPU_FREQ_DEFAULT_GOV_ONDEMAND |
Rafael J. Wysocki | de1df26 | 2016-02-05 02:37:42 +0100 | [diff] [blame] | 507 | struct cpufreq_governor *cpufreq_default_governor(void) |
| 508 | { |
Rafael J. Wysocki | af92618 | 2016-02-05 03:16:08 +0100 | [diff] [blame] | 509 | return CPU_FREQ_GOV_ONDEMAND; |
Rafael J. Wysocki | de1df26 | 2016-02-05 02:37:42 +0100 | [diff] [blame] | 510 | } |
| 511 | |
Johannes Weiner | 6915719 | 2008-01-17 15:21:08 -0800 | [diff] [blame] | 512 | fs_initcall(cpufreq_gov_dbs_init); |
| 513 | #else |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 514 | module_init(cpufreq_gov_dbs_init); |
Johannes Weiner | 6915719 | 2008-01-17 15:21:08 -0800 | [diff] [blame] | 515 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 516 | module_exit(cpufreq_gov_dbs_exit); |