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> |
Viresh Kumar | 4d5dcc4 | 2013-03-27 15:58:58 +0000 | [diff] [blame] | 23 | #include <linux/slab.h> |
Viresh Kumar | 4471a34 | 2012-10-26 00:47:42 +0200 | [diff] [blame] | 24 | #include <linux/sysfs.h> |
venkatesh.pallipadi@intel.com | 8080091 | 2008-08-04 11:59:12 -0700 | [diff] [blame] | 25 | #include <linux/tick.h> |
Viresh Kumar | 4471a34 | 2012-10-26 00:47:42 +0200 | [diff] [blame] | 26 | #include <linux/types.h> |
Jacob Shin | fb30809 | 2013-04-02 09:56:56 -0500 | [diff] [blame] | 27 | #include <linux/cpu.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 | #include "cpufreq_governor.h" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 30 | |
Stratos Karafotis | 06eb09d | 2013-02-08 17:24:18 +0000 | [diff] [blame] | 31 | /* On-demand governor macros */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 32 | #define DEF_FREQUENCY_UP_THRESHOLD (80) |
David C Niemi | 3f78a9f | 2010-10-06 16:54:24 -0400 | [diff] [blame] | 33 | #define DEF_SAMPLING_DOWN_FACTOR (1) |
| 34 | #define MAX_SAMPLING_DOWN_FACTOR (100000) |
venkatesh.pallipadi@intel.com | 8080091 | 2008-08-04 11:59:12 -0700 | [diff] [blame] | 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 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] | 41 | |
Jacob Shin | fb30809 | 2013-04-02 09:56:56 -0500 | [diff] [blame] | 42 | static struct od_ops od_ops; |
| 43 | |
Fabio Baltieri | 3e33ee9 | 2012-11-26 18:10:12 +0000 | [diff] [blame] | 44 | #ifndef CONFIG_CPU_FREQ_DEFAULT_GOV_ONDEMAND |
| 45 | static struct cpufreq_governor cpufreq_gov_ondemand; |
| 46 | #endif |
| 47 | |
Jacob Shin | c283755 | 2013-06-25 22:42:37 +0200 | [diff] [blame] | 48 | static unsigned int default_powersave_bias; |
| 49 | |
Viresh Kumar | 4471a34 | 2012-10-26 00:47:42 +0200 | [diff] [blame] | 50 | static void ondemand_powersave_bias_init_cpu(int cpu) |
Arjan van de Ven | 6b8fcd9 | 2010-05-09 08:26:06 -0700 | [diff] [blame] | 51 | { |
Viresh Kumar | 4471a34 | 2012-10-26 00:47:42 +0200 | [diff] [blame] | 52 | 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] | 53 | |
Viresh Kumar | 4471a34 | 2012-10-26 00:47:42 +0200 | [diff] [blame] | 54 | dbs_info->freq_table = cpufreq_frequency_get_table(cpu); |
| 55 | dbs_info->freq_lo = 0; |
| 56 | } |
Arjan van de Ven | 6b8fcd9 | 2010-05-09 08:26:06 -0700 | [diff] [blame] | 57 | |
Viresh Kumar | 4471a34 | 2012-10-26 00:47:42 +0200 | [diff] [blame] | 58 | /* |
| 59 | * Not all CPUs want IO time to be accounted as busy; this depends on how |
| 60 | * efficient idling at a higher frequency/voltage is. |
| 61 | * Pavel Machek says this is not so for various generations of AMD and old |
| 62 | * Intel systems. |
Stratos Karafotis | 06eb09d | 2013-02-08 17:24:18 +0000 | [diff] [blame] | 63 | * Mike Chan (android.com) claims this is also not true for ARM. |
Viresh Kumar | 4471a34 | 2012-10-26 00:47:42 +0200 | [diff] [blame] | 64 | * Because of this, whitelist specific known (series) of CPUs by default, and |
| 65 | * leave all others up to the user. |
| 66 | */ |
| 67 | static int should_io_be_busy(void) |
| 68 | { |
| 69 | #if defined(CONFIG_X86) |
| 70 | /* |
Stratos Karafotis | 06eb09d | 2013-02-08 17:24:18 +0000 | [diff] [blame] | 71 | * For Intel, Core 2 (model 15) and later have an efficient idle. |
Viresh Kumar | 4471a34 | 2012-10-26 00:47:42 +0200 | [diff] [blame] | 72 | */ |
| 73 | if (boot_cpu_data.x86_vendor == X86_VENDOR_INTEL && |
| 74 | boot_cpu_data.x86 == 6 && |
| 75 | boot_cpu_data.x86_model >= 15) |
| 76 | return 1; |
| 77 | #endif |
| 78 | return 0; |
Arjan van de Ven | 6b8fcd9 | 2010-05-09 08:26:06 -0700 | [diff] [blame] | 79 | } |
| 80 | |
Alexey Starikovskiy | 05ca035 | 2006-07-31 22:28:12 +0400 | [diff] [blame] | 81 | /* |
| 82 | * Find right freq to be set now with powersave_bias on. |
| 83 | * Returns the freq_hi to be used right now and will set freq_hi_jiffies, |
| 84 | * freq_lo, and freq_lo_jiffies in percpu area for averaging freqs. |
| 85 | */ |
Jacob Shin | fb30809 | 2013-04-02 09:56:56 -0500 | [diff] [blame] | 86 | static unsigned int generic_powersave_bias_target(struct cpufreq_policy *policy, |
Viresh Kumar | 4471a34 | 2012-10-26 00:47:42 +0200 | [diff] [blame] | 87 | unsigned int freq_next, unsigned int relation) |
Alexey Starikovskiy | 05ca035 | 2006-07-31 22:28:12 +0400 | [diff] [blame] | 88 | { |
| 89 | unsigned int freq_req, freq_reduc, freq_avg; |
| 90 | unsigned int freq_hi, freq_lo; |
| 91 | unsigned int index = 0; |
| 92 | unsigned int jiffies_total, jiffies_hi, jiffies_lo; |
Viresh Kumar | 4471a34 | 2012-10-26 00:47:42 +0200 | [diff] [blame] | 93 | 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] | 94 | policy->cpu); |
Viresh Kumar | 4d5dcc4 | 2013-03-27 15:58:58 +0000 | [diff] [blame] | 95 | struct dbs_data *dbs_data = policy->governor_data; |
| 96 | struct od_dbs_tuners *od_tuners = dbs_data->tuners; |
Alexey Starikovskiy | 05ca035 | 2006-07-31 22:28:12 +0400 | [diff] [blame] | 97 | |
| 98 | if (!dbs_info->freq_table) { |
| 99 | dbs_info->freq_lo = 0; |
| 100 | dbs_info->freq_lo_jiffies = 0; |
| 101 | return freq_next; |
| 102 | } |
| 103 | |
| 104 | cpufreq_frequency_table_target(policy, dbs_info->freq_table, freq_next, |
| 105 | relation, &index); |
| 106 | freq_req = dbs_info->freq_table[index].frequency; |
Viresh Kumar | 4d5dcc4 | 2013-03-27 15:58:58 +0000 | [diff] [blame] | 107 | freq_reduc = freq_req * od_tuners->powersave_bias / 1000; |
Alexey Starikovskiy | 05ca035 | 2006-07-31 22:28:12 +0400 | [diff] [blame] | 108 | freq_avg = freq_req - freq_reduc; |
| 109 | |
| 110 | /* Find freq bounds for freq_avg in freq_table */ |
| 111 | index = 0; |
| 112 | cpufreq_frequency_table_target(policy, dbs_info->freq_table, freq_avg, |
| 113 | CPUFREQ_RELATION_H, &index); |
| 114 | freq_lo = dbs_info->freq_table[index].frequency; |
| 115 | index = 0; |
| 116 | cpufreq_frequency_table_target(policy, dbs_info->freq_table, freq_avg, |
| 117 | CPUFREQ_RELATION_L, &index); |
| 118 | freq_hi = dbs_info->freq_table[index].frequency; |
| 119 | |
| 120 | /* Find out how long we have to be in hi and lo freqs */ |
| 121 | if (freq_hi == freq_lo) { |
| 122 | dbs_info->freq_lo = 0; |
| 123 | dbs_info->freq_lo_jiffies = 0; |
| 124 | return freq_lo; |
| 125 | } |
Viresh Kumar | 4d5dcc4 | 2013-03-27 15:58:58 +0000 | [diff] [blame] | 126 | jiffies_total = usecs_to_jiffies(od_tuners->sampling_rate); |
Alexey Starikovskiy | 05ca035 | 2006-07-31 22:28:12 +0400 | [diff] [blame] | 127 | jiffies_hi = (freq_avg - freq_lo) * jiffies_total; |
| 128 | jiffies_hi += ((freq_hi - freq_lo) / 2); |
| 129 | jiffies_hi /= (freq_hi - freq_lo); |
| 130 | jiffies_lo = jiffies_total - jiffies_hi; |
| 131 | dbs_info->freq_lo = freq_lo; |
| 132 | dbs_info->freq_lo_jiffies = jiffies_lo; |
| 133 | dbs_info->freq_hi_jiffies = jiffies_hi; |
| 134 | return freq_hi; |
| 135 | } |
| 136 | |
| 137 | static void ondemand_powersave_bias_init(void) |
| 138 | { |
| 139 | int i; |
| 140 | for_each_online_cpu(i) { |
venkatesh.pallipadi@intel.com | 5a75c82 | 2009-07-02 17:08:32 -0700 | [diff] [blame] | 141 | ondemand_powersave_bias_init_cpu(i); |
Alexey Starikovskiy | 05ca035 | 2006-07-31 22:28:12 +0400 | [diff] [blame] | 142 | } |
| 143 | } |
| 144 | |
Viresh Kumar | 4471a34 | 2012-10-26 00:47:42 +0200 | [diff] [blame] | 145 | static void dbs_freq_increase(struct cpufreq_policy *p, unsigned int freq) |
| 146 | { |
Viresh Kumar | 4d5dcc4 | 2013-03-27 15:58:58 +0000 | [diff] [blame] | 147 | struct dbs_data *dbs_data = p->governor_data; |
| 148 | struct od_dbs_tuners *od_tuners = dbs_data->tuners; |
| 149 | |
| 150 | if (od_tuners->powersave_bias) |
Jacob Shin | fb30809 | 2013-04-02 09:56:56 -0500 | [diff] [blame] | 151 | freq = od_ops.powersave_bias_target(p, freq, |
| 152 | CPUFREQ_RELATION_H); |
Viresh Kumar | 4471a34 | 2012-10-26 00:47:42 +0200 | [diff] [blame] | 153 | else if (p->cur == p->max) |
| 154 | return; |
| 155 | |
Viresh Kumar | 4d5dcc4 | 2013-03-27 15:58:58 +0000 | [diff] [blame] | 156 | __cpufreq_driver_target(p, freq, od_tuners->powersave_bias ? |
Viresh Kumar | 4471a34 | 2012-10-26 00:47:42 +0200 | [diff] [blame] | 157 | CPUFREQ_RELATION_L : CPUFREQ_RELATION_H); |
| 158 | } |
| 159 | |
| 160 | /* |
| 161 | * 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] | 162 | * (default), then we try to increase frequency. Else, we adjust the frequency |
| 163 | * proportional to load. |
Viresh Kumar | 4471a34 | 2012-10-26 00:47:42 +0200 | [diff] [blame] | 164 | */ |
Stratos Karafotis | dfa5bb6 | 2013-06-05 19:01:25 +0300 | [diff] [blame] | 165 | static void od_check_cpu(int cpu, unsigned int load) |
Viresh Kumar | 4471a34 | 2012-10-26 00:47:42 +0200 | [diff] [blame] | 166 | { |
| 167 | struct od_cpu_dbs_info_s *dbs_info = &per_cpu(od_cpu_dbs_info, cpu); |
| 168 | struct cpufreq_policy *policy = dbs_info->cdbs.cur_policy; |
Viresh Kumar | 4d5dcc4 | 2013-03-27 15:58:58 +0000 | [diff] [blame] | 169 | struct dbs_data *dbs_data = policy->governor_data; |
| 170 | struct od_dbs_tuners *od_tuners = dbs_data->tuners; |
Viresh Kumar | 4471a34 | 2012-10-26 00:47:42 +0200 | [diff] [blame] | 171 | |
| 172 | dbs_info->freq_lo = 0; |
| 173 | |
| 174 | /* Check for frequency increase */ |
Stratos Karafotis | dfa5bb6 | 2013-06-05 19:01:25 +0300 | [diff] [blame] | 175 | if (load > od_tuners->up_threshold) { |
Viresh Kumar | 4471a34 | 2012-10-26 00:47:42 +0200 | [diff] [blame] | 176 | /* If switching to max speed, apply sampling_down_factor */ |
| 177 | if (policy->cur < policy->max) |
| 178 | dbs_info->rate_mult = |
Viresh Kumar | 4d5dcc4 | 2013-03-27 15:58:58 +0000 | [diff] [blame] | 179 | od_tuners->sampling_down_factor; |
Viresh Kumar | 4471a34 | 2012-10-26 00:47:42 +0200 | [diff] [blame] | 180 | dbs_freq_increase(policy, policy->max); |
| 181 | return; |
Stratos Karafotis | dfa5bb6 | 2013-06-05 19:01:25 +0300 | [diff] [blame] | 182 | } else { |
| 183 | /* Calculate the next frequency proportional to load */ |
Viresh Kumar | 4471a34 | 2012-10-26 00:47:42 +0200 | [diff] [blame] | 184 | unsigned int freq_next; |
Stratos Karafotis | dfa5bb6 | 2013-06-05 19:01:25 +0300 | [diff] [blame] | 185 | freq_next = load * policy->cpuinfo.max_freq / 100; |
Viresh Kumar | 4471a34 | 2012-10-26 00:47:42 +0200 | [diff] [blame] | 186 | |
| 187 | /* No longer fully busy, reset rate_mult */ |
| 188 | dbs_info->rate_mult = 1; |
| 189 | |
| 190 | if (freq_next < policy->min) |
| 191 | freq_next = policy->min; |
| 192 | |
Viresh Kumar | 4d5dcc4 | 2013-03-27 15:58:58 +0000 | [diff] [blame] | 193 | if (!od_tuners->powersave_bias) { |
Viresh Kumar | 4471a34 | 2012-10-26 00:47:42 +0200 | [diff] [blame] | 194 | __cpufreq_driver_target(policy, freq_next, |
| 195 | CPUFREQ_RELATION_L); |
Jacob Shin | fb30809 | 2013-04-02 09:56:56 -0500 | [diff] [blame] | 196 | return; |
Viresh Kumar | 4471a34 | 2012-10-26 00:47:42 +0200 | [diff] [blame] | 197 | } |
Jacob Shin | fb30809 | 2013-04-02 09:56:56 -0500 | [diff] [blame] | 198 | |
| 199 | freq_next = od_ops.powersave_bias_target(policy, freq_next, |
| 200 | CPUFREQ_RELATION_L); |
| 201 | __cpufreq_driver_target(policy, freq_next, CPUFREQ_RELATION_L); |
Viresh Kumar | 4471a34 | 2012-10-26 00:47:42 +0200 | [diff] [blame] | 202 | } |
| 203 | } |
| 204 | |
Fabio Baltieri | da53d61 | 2012-12-27 14:55:40 +0000 | [diff] [blame] | 205 | static void od_dbs_timer(struct work_struct *work) |
| 206 | { |
Fabio Baltieri | da53d61 | 2012-12-27 14:55:40 +0000 | [diff] [blame] | 207 | struct od_cpu_dbs_info_s *dbs_info = |
| 208 | container_of(work, struct od_cpu_dbs_info_s, cdbs.work.work); |
Viresh Kumar | 4447266 | 2013-01-31 17:28:02 +0000 | [diff] [blame] | 209 | unsigned int cpu = dbs_info->cdbs.cur_policy->cpu; |
| 210 | struct od_cpu_dbs_info_s *core_dbs_info = &per_cpu(od_cpu_dbs_info, |
| 211 | cpu); |
Viresh Kumar | 4d5dcc4 | 2013-03-27 15:58:58 +0000 | [diff] [blame] | 212 | struct dbs_data *dbs_data = dbs_info->cdbs.cur_policy->governor_data; |
| 213 | struct od_dbs_tuners *od_tuners = dbs_data->tuners; |
Viresh Kumar | 9d44592 | 2013-02-27 11:06:36 +0530 | [diff] [blame] | 214 | int delay = 0, sample_type = core_dbs_info->sample_type; |
Viresh Kumar | 031299b | 2013-02-27 12:24:03 +0530 | [diff] [blame] | 215 | bool modify_all = true; |
Fabio Baltieri | da53d61 | 2012-12-27 14:55:40 +0000 | [diff] [blame] | 216 | |
Viresh Kumar | 4447266 | 2013-01-31 17:28:02 +0000 | [diff] [blame] | 217 | mutex_lock(&core_dbs_info->cdbs.timer_mutex); |
Viresh Kumar | 031299b | 2013-02-27 12:24:03 +0530 | [diff] [blame] | 218 | if (!need_load_eval(&core_dbs_info->cdbs, od_tuners->sampling_rate)) { |
| 219 | modify_all = false; |
Viresh Kumar | 9d44592 | 2013-02-27 11:06:36 +0530 | [diff] [blame] | 220 | goto max_delay; |
Viresh Kumar | 031299b | 2013-02-27 12:24:03 +0530 | [diff] [blame] | 221 | } |
Viresh Kumar | 4447266 | 2013-01-31 17:28:02 +0000 | [diff] [blame] | 222 | |
| 223 | /* Common NORMAL_SAMPLE setup */ |
| 224 | core_dbs_info->sample_type = OD_NORMAL_SAMPLE; |
| 225 | if (sample_type == OD_SUB_SAMPLE) { |
| 226 | delay = core_dbs_info->freq_lo_jiffies; |
Viresh Kumar | 9d44592 | 2013-02-27 11:06:36 +0530 | [diff] [blame] | 227 | __cpufreq_driver_target(core_dbs_info->cdbs.cur_policy, |
| 228 | core_dbs_info->freq_lo, CPUFREQ_RELATION_H); |
Fabio Baltieri | da53d61 | 2012-12-27 14:55:40 +0000 | [diff] [blame] | 229 | } else { |
Viresh Kumar | 9d44592 | 2013-02-27 11:06:36 +0530 | [diff] [blame] | 230 | dbs_check_cpu(dbs_data, cpu); |
Viresh Kumar | 4447266 | 2013-01-31 17:28:02 +0000 | [diff] [blame] | 231 | if (core_dbs_info->freq_lo) { |
| 232 | /* Setup timer for SUB_SAMPLE */ |
| 233 | core_dbs_info->sample_type = OD_SUB_SAMPLE; |
| 234 | delay = core_dbs_info->freq_hi_jiffies; |
Viresh Kumar | 4447266 | 2013-01-31 17:28:02 +0000 | [diff] [blame] | 235 | } |
Fabio Baltieri | da53d61 | 2012-12-27 14:55:40 +0000 | [diff] [blame] | 236 | } |
Viresh Kumar | 4447266 | 2013-01-31 17:28:02 +0000 | [diff] [blame] | 237 | |
Viresh Kumar | 9d44592 | 2013-02-27 11:06:36 +0530 | [diff] [blame] | 238 | max_delay: |
| 239 | if (!delay) |
| 240 | delay = delay_for_sampling_rate(od_tuners->sampling_rate |
| 241 | * core_dbs_info->rate_mult); |
| 242 | |
Viresh Kumar | 031299b | 2013-02-27 12:24:03 +0530 | [diff] [blame] | 243 | gov_queue_work(dbs_data, dbs_info->cdbs.cur_policy, delay, modify_all); |
Viresh Kumar | 4447266 | 2013-01-31 17:28:02 +0000 | [diff] [blame] | 244 | mutex_unlock(&core_dbs_info->cdbs.timer_mutex); |
Fabio Baltieri | da53d61 | 2012-12-27 14:55:40 +0000 | [diff] [blame] | 245 | } |
| 246 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 247 | /************************** sysfs interface ************************/ |
Viresh Kumar | 4d5dcc4 | 2013-03-27 15:58:58 +0000 | [diff] [blame] | 248 | static struct common_dbs_data od_dbs_cdata; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 249 | |
MyungJoo Ham | fd0ef7a | 2012-02-29 17:54:41 +0900 | [diff] [blame] | 250 | /** |
| 251 | * update_sampling_rate - update sampling rate effective immediately if needed. |
| 252 | * @new_rate: new sampling rate |
| 253 | * |
Stratos Karafotis | 06eb09d | 2013-02-08 17:24:18 +0000 | [diff] [blame] | 254 | * If new rate is smaller than the old, simply updating |
Viresh Kumar | 4471a34 | 2012-10-26 00:47:42 +0200 | [diff] [blame] | 255 | * dbs_tuners_int.sampling_rate might not be appropriate. For example, if the |
| 256 | * original sampling_rate was 1 second and the requested new sampling rate is 10 |
| 257 | * ms because the user needs immediate reaction from ondemand governor, but not |
| 258 | * sure if higher frequency will be required or not, then, the governor may |
| 259 | * change the sampling rate too late; up to 1 second later. Thus, if we are |
| 260 | * reducing the sampling rate, we need to make the new value effective |
| 261 | * immediately. |
MyungJoo Ham | fd0ef7a | 2012-02-29 17:54:41 +0900 | [diff] [blame] | 262 | */ |
Viresh Kumar | 4d5dcc4 | 2013-03-27 15:58:58 +0000 | [diff] [blame] | 263 | static void update_sampling_rate(struct dbs_data *dbs_data, |
| 264 | unsigned int new_rate) |
MyungJoo Ham | fd0ef7a | 2012-02-29 17:54:41 +0900 | [diff] [blame] | 265 | { |
Viresh Kumar | 4d5dcc4 | 2013-03-27 15:58:58 +0000 | [diff] [blame] | 266 | struct od_dbs_tuners *od_tuners = dbs_data->tuners; |
MyungJoo Ham | fd0ef7a | 2012-02-29 17:54:41 +0900 | [diff] [blame] | 267 | int cpu; |
| 268 | |
Viresh Kumar | 4d5dcc4 | 2013-03-27 15:58:58 +0000 | [diff] [blame] | 269 | od_tuners->sampling_rate = new_rate = max(new_rate, |
| 270 | dbs_data->min_sampling_rate); |
MyungJoo Ham | fd0ef7a | 2012-02-29 17:54:41 +0900 | [diff] [blame] | 271 | |
| 272 | for_each_online_cpu(cpu) { |
| 273 | struct cpufreq_policy *policy; |
Viresh Kumar | 4471a34 | 2012-10-26 00:47:42 +0200 | [diff] [blame] | 274 | struct od_cpu_dbs_info_s *dbs_info; |
MyungJoo Ham | fd0ef7a | 2012-02-29 17:54:41 +0900 | [diff] [blame] | 275 | unsigned long next_sampling, appointed_at; |
| 276 | |
| 277 | policy = cpufreq_cpu_get(cpu); |
| 278 | if (!policy) |
| 279 | continue; |
Fabio Baltieri | 3e33ee9 | 2012-11-26 18:10:12 +0000 | [diff] [blame] | 280 | if (policy->governor != &cpufreq_gov_ondemand) { |
| 281 | cpufreq_cpu_put(policy); |
| 282 | continue; |
| 283 | } |
Fabio Baltieri | 8ee2ec5 | 2012-12-27 14:55:42 +0000 | [diff] [blame] | 284 | dbs_info = &per_cpu(od_cpu_dbs_info, cpu); |
MyungJoo Ham | fd0ef7a | 2012-02-29 17:54:41 +0900 | [diff] [blame] | 285 | cpufreq_cpu_put(policy); |
| 286 | |
Viresh Kumar | 4471a34 | 2012-10-26 00:47:42 +0200 | [diff] [blame] | 287 | mutex_lock(&dbs_info->cdbs.timer_mutex); |
MyungJoo Ham | fd0ef7a | 2012-02-29 17:54:41 +0900 | [diff] [blame] | 288 | |
Viresh Kumar | 4471a34 | 2012-10-26 00:47:42 +0200 | [diff] [blame] | 289 | if (!delayed_work_pending(&dbs_info->cdbs.work)) { |
| 290 | mutex_unlock(&dbs_info->cdbs.timer_mutex); |
MyungJoo Ham | fd0ef7a | 2012-02-29 17:54:41 +0900 | [diff] [blame] | 291 | continue; |
| 292 | } |
| 293 | |
Viresh Kumar | 4471a34 | 2012-10-26 00:47:42 +0200 | [diff] [blame] | 294 | next_sampling = jiffies + usecs_to_jiffies(new_rate); |
| 295 | appointed_at = dbs_info->cdbs.work.timer.expires; |
MyungJoo Ham | fd0ef7a | 2012-02-29 17:54:41 +0900 | [diff] [blame] | 296 | |
| 297 | if (time_before(next_sampling, appointed_at)) { |
| 298 | |
Viresh Kumar | 4471a34 | 2012-10-26 00:47:42 +0200 | [diff] [blame] | 299 | mutex_unlock(&dbs_info->cdbs.timer_mutex); |
| 300 | cancel_delayed_work_sync(&dbs_info->cdbs.work); |
| 301 | mutex_lock(&dbs_info->cdbs.timer_mutex); |
MyungJoo Ham | fd0ef7a | 2012-02-29 17:54:41 +0900 | [diff] [blame] | 302 | |
Viresh Kumar | 031299b | 2013-02-27 12:24:03 +0530 | [diff] [blame] | 303 | gov_queue_work(dbs_data, dbs_info->cdbs.cur_policy, |
| 304 | usecs_to_jiffies(new_rate), true); |
MyungJoo Ham | fd0ef7a | 2012-02-29 17:54:41 +0900 | [diff] [blame] | 305 | |
| 306 | } |
Viresh Kumar | 4471a34 | 2012-10-26 00:47:42 +0200 | [diff] [blame] | 307 | mutex_unlock(&dbs_info->cdbs.timer_mutex); |
MyungJoo Ham | fd0ef7a | 2012-02-29 17:54:41 +0900 | [diff] [blame] | 308 | } |
| 309 | } |
| 310 | |
Viresh Kumar | 4d5dcc4 | 2013-03-27 15:58:58 +0000 | [diff] [blame] | 311 | static ssize_t store_sampling_rate(struct dbs_data *dbs_data, const char *buf, |
| 312 | size_t count) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 313 | { |
| 314 | unsigned int input; |
| 315 | int ret; |
Venkatesh Pallipadi | ffac80e | 2006-06-28 13:52:18 -0700 | [diff] [blame] | 316 | ret = sscanf(buf, "%u", &input); |
venkatesh.pallipadi@intel.com | 5a75c82 | 2009-07-02 17:08:32 -0700 | [diff] [blame] | 317 | if (ret != 1) |
| 318 | return -EINVAL; |
Viresh Kumar | 4d5dcc4 | 2013-03-27 15:58:58 +0000 | [diff] [blame] | 319 | |
| 320 | update_sampling_rate(dbs_data, input); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 321 | return count; |
| 322 | } |
| 323 | |
Viresh Kumar | 4d5dcc4 | 2013-03-27 15:58:58 +0000 | [diff] [blame] | 324 | static ssize_t store_io_is_busy(struct dbs_data *dbs_data, const char *buf, |
| 325 | size_t count) |
Arjan van de Ven | 19379b1 | 2010-05-09 08:26:51 -0700 | [diff] [blame] | 326 | { |
Viresh Kumar | 4d5dcc4 | 2013-03-27 15:58:58 +0000 | [diff] [blame] | 327 | struct od_dbs_tuners *od_tuners = dbs_data->tuners; |
Arjan van de Ven | 19379b1 | 2010-05-09 08:26:51 -0700 | [diff] [blame] | 328 | unsigned int input; |
| 329 | int ret; |
Stratos Karafotis | 9366d84 | 2013-02-28 16:57:32 +0000 | [diff] [blame] | 330 | unsigned int j; |
Arjan van de Ven | 19379b1 | 2010-05-09 08:26:51 -0700 | [diff] [blame] | 331 | |
| 332 | ret = sscanf(buf, "%u", &input); |
| 333 | if (ret != 1) |
| 334 | return -EINVAL; |
Viresh Kumar | 4d5dcc4 | 2013-03-27 15:58:58 +0000 | [diff] [blame] | 335 | od_tuners->io_is_busy = !!input; |
Stratos Karafotis | 9366d84 | 2013-02-28 16:57:32 +0000 | [diff] [blame] | 336 | |
| 337 | /* we need to re-evaluate prev_cpu_idle */ |
| 338 | for_each_online_cpu(j) { |
| 339 | struct od_cpu_dbs_info_s *dbs_info = &per_cpu(od_cpu_dbs_info, |
| 340 | j); |
| 341 | dbs_info->cdbs.prev_cpu_idle = get_cpu_idle_time(j, |
| 342 | &dbs_info->cdbs.prev_cpu_wall, od_tuners->io_is_busy); |
| 343 | } |
Arjan van de Ven | 19379b1 | 2010-05-09 08:26:51 -0700 | [diff] [blame] | 344 | return count; |
| 345 | } |
| 346 | |
Viresh Kumar | 4d5dcc4 | 2013-03-27 15:58:58 +0000 | [diff] [blame] | 347 | static ssize_t store_up_threshold(struct dbs_data *dbs_data, const char *buf, |
| 348 | size_t count) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 349 | { |
Viresh Kumar | 4d5dcc4 | 2013-03-27 15:58:58 +0000 | [diff] [blame] | 350 | struct od_dbs_tuners *od_tuners = dbs_data->tuners; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 351 | unsigned int input; |
| 352 | int ret; |
Venkatesh Pallipadi | ffac80e | 2006-06-28 13:52:18 -0700 | [diff] [blame] | 353 | ret = sscanf(buf, "%u", &input); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 354 | |
Dave Jones | 32ee8c3 | 2006-02-28 00:43:23 -0500 | [diff] [blame] | 355 | if (ret != 1 || input > MAX_FREQUENCY_UP_THRESHOLD || |
Dave Jones | c29f140 | 2005-05-31 19:03:50 -0700 | [diff] [blame] | 356 | input < MIN_FREQUENCY_UP_THRESHOLD) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 357 | return -EINVAL; |
| 358 | } |
Stratos Karafotis | 4bd4e42 | 2013-02-06 13:34:00 +0100 | [diff] [blame] | 359 | |
Viresh Kumar | 4d5dcc4 | 2013-03-27 15:58:58 +0000 | [diff] [blame] | 360 | od_tuners->up_threshold = input; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 361 | return count; |
| 362 | } |
| 363 | |
Viresh Kumar | 4d5dcc4 | 2013-03-27 15:58:58 +0000 | [diff] [blame] | 364 | static ssize_t store_sampling_down_factor(struct dbs_data *dbs_data, |
| 365 | const char *buf, size_t count) |
David C Niemi | 3f78a9f | 2010-10-06 16:54:24 -0400 | [diff] [blame] | 366 | { |
Viresh Kumar | 4d5dcc4 | 2013-03-27 15:58:58 +0000 | [diff] [blame] | 367 | struct od_dbs_tuners *od_tuners = dbs_data->tuners; |
David C Niemi | 3f78a9f | 2010-10-06 16:54:24 -0400 | [diff] [blame] | 368 | unsigned int input, j; |
| 369 | int ret; |
| 370 | ret = sscanf(buf, "%u", &input); |
| 371 | |
| 372 | if (ret != 1 || input > MAX_SAMPLING_DOWN_FACTOR || input < 1) |
| 373 | return -EINVAL; |
Viresh Kumar | 4d5dcc4 | 2013-03-27 15:58:58 +0000 | [diff] [blame] | 374 | od_tuners->sampling_down_factor = input; |
David C Niemi | 3f78a9f | 2010-10-06 16:54:24 -0400 | [diff] [blame] | 375 | |
| 376 | /* Reset down sampling multiplier in case it was active */ |
| 377 | for_each_online_cpu(j) { |
Viresh Kumar | 4471a34 | 2012-10-26 00:47:42 +0200 | [diff] [blame] | 378 | struct od_cpu_dbs_info_s *dbs_info = &per_cpu(od_cpu_dbs_info, |
| 379 | j); |
David C Niemi | 3f78a9f | 2010-10-06 16:54:24 -0400 | [diff] [blame] | 380 | dbs_info->rate_mult = 1; |
| 381 | } |
David C Niemi | 3f78a9f | 2010-10-06 16:54:24 -0400 | [diff] [blame] | 382 | return count; |
| 383 | } |
| 384 | |
Viresh Kumar | 4d5dcc4 | 2013-03-27 15:58:58 +0000 | [diff] [blame] | 385 | static ssize_t store_ignore_nice(struct dbs_data *dbs_data, const char *buf, |
| 386 | size_t count) |
Dave Jones | 3d5ee9e | 2005-05-31 19:03:47 -0700 | [diff] [blame] | 387 | { |
Viresh Kumar | 4d5dcc4 | 2013-03-27 15:58:58 +0000 | [diff] [blame] | 388 | struct od_dbs_tuners *od_tuners = dbs_data->tuners; |
Dave Jones | 3d5ee9e | 2005-05-31 19:03:47 -0700 | [diff] [blame] | 389 | unsigned int input; |
| 390 | int ret; |
| 391 | |
| 392 | unsigned int j; |
Dave Jones | 32ee8c3 | 2006-02-28 00:43:23 -0500 | [diff] [blame] | 393 | |
Venkatesh Pallipadi | ffac80e | 2006-06-28 13:52:18 -0700 | [diff] [blame] | 394 | ret = sscanf(buf, "%u", &input); |
Dave Jones | 2b03f89 | 2009-01-18 01:43:44 -0500 | [diff] [blame] | 395 | if (ret != 1) |
Dave Jones | 3d5ee9e | 2005-05-31 19:03:47 -0700 | [diff] [blame] | 396 | return -EINVAL; |
| 397 | |
Dave Jones | 2b03f89 | 2009-01-18 01:43:44 -0500 | [diff] [blame] | 398 | if (input > 1) |
Dave Jones | 3d5ee9e | 2005-05-31 19:03:47 -0700 | [diff] [blame] | 399 | input = 1; |
Dave Jones | 32ee8c3 | 2006-02-28 00:43:23 -0500 | [diff] [blame] | 400 | |
Viresh Kumar | 4d5dcc4 | 2013-03-27 15:58:58 +0000 | [diff] [blame] | 401 | if (input == od_tuners->ignore_nice) { /* nothing to do */ |
Dave Jones | 3d5ee9e | 2005-05-31 19:03:47 -0700 | [diff] [blame] | 402 | return count; |
| 403 | } |
Viresh Kumar | 4d5dcc4 | 2013-03-27 15:58:58 +0000 | [diff] [blame] | 404 | od_tuners->ignore_nice = input; |
Dave Jones | 3d5ee9e | 2005-05-31 19:03:47 -0700 | [diff] [blame] | 405 | |
Venkatesh Pallipadi | ccb2fe2 | 2006-06-28 13:49:52 -0700 | [diff] [blame] | 406 | /* we need to re-evaluate prev_cpu_idle */ |
Dave Jones | dac1c1a | 2005-05-31 19:03:49 -0700 | [diff] [blame] | 407 | for_each_online_cpu(j) { |
Viresh Kumar | 4471a34 | 2012-10-26 00:47:42 +0200 | [diff] [blame] | 408 | struct od_cpu_dbs_info_s *dbs_info; |
Tejun Heo | 245b2e7 | 2009-06-24 15:13:48 +0900 | [diff] [blame] | 409 | dbs_info = &per_cpu(od_cpu_dbs_info, j); |
Viresh Kumar | 4471a34 | 2012-10-26 00:47:42 +0200 | [diff] [blame] | 410 | dbs_info->cdbs.prev_cpu_idle = get_cpu_idle_time(j, |
Stratos Karafotis | 9366d84 | 2013-02-28 16:57:32 +0000 | [diff] [blame] | 411 | &dbs_info->cdbs.prev_cpu_wall, od_tuners->io_is_busy); |
Viresh Kumar | 4d5dcc4 | 2013-03-27 15:58:58 +0000 | [diff] [blame] | 412 | if (od_tuners->ignore_nice) |
Viresh Kumar | 4471a34 | 2012-10-26 00:47:42 +0200 | [diff] [blame] | 413 | dbs_info->cdbs.prev_cpu_nice = |
| 414 | kcpustat_cpu(j).cpustat[CPUTIME_NICE]; |
Venkatesh Pallipadi | 1ca3abd | 2009-01-23 09:25:02 -0500 | [diff] [blame] | 415 | |
Dave Jones | 3d5ee9e | 2005-05-31 19:03:47 -0700 | [diff] [blame] | 416 | } |
Dave Jones | 3d5ee9e | 2005-05-31 19:03:47 -0700 | [diff] [blame] | 417 | return count; |
| 418 | } |
| 419 | |
Viresh Kumar | 4d5dcc4 | 2013-03-27 15:58:58 +0000 | [diff] [blame] | 420 | static ssize_t store_powersave_bias(struct dbs_data *dbs_data, const char *buf, |
| 421 | size_t count) |
Alexey Starikovskiy | 05ca035 | 2006-07-31 22:28:12 +0400 | [diff] [blame] | 422 | { |
Viresh Kumar | 4d5dcc4 | 2013-03-27 15:58:58 +0000 | [diff] [blame] | 423 | struct od_dbs_tuners *od_tuners = dbs_data->tuners; |
Alexey Starikovskiy | 05ca035 | 2006-07-31 22:28:12 +0400 | [diff] [blame] | 424 | unsigned int input; |
| 425 | int ret; |
| 426 | ret = sscanf(buf, "%u", &input); |
| 427 | |
| 428 | if (ret != 1) |
| 429 | return -EINVAL; |
| 430 | |
| 431 | if (input > 1000) |
| 432 | input = 1000; |
| 433 | |
Viresh Kumar | 4d5dcc4 | 2013-03-27 15:58:58 +0000 | [diff] [blame] | 434 | od_tuners->powersave_bias = input; |
Alexey Starikovskiy | 05ca035 | 2006-07-31 22:28:12 +0400 | [diff] [blame] | 435 | ondemand_powersave_bias_init(); |
Alexey Starikovskiy | 05ca035 | 2006-07-31 22:28:12 +0400 | [diff] [blame] | 436 | return count; |
| 437 | } |
| 438 | |
Viresh Kumar | 4d5dcc4 | 2013-03-27 15:58:58 +0000 | [diff] [blame] | 439 | show_store_one(od, sampling_rate); |
| 440 | show_store_one(od, io_is_busy); |
| 441 | show_store_one(od, up_threshold); |
| 442 | show_store_one(od, sampling_down_factor); |
| 443 | show_store_one(od, ignore_nice); |
| 444 | show_store_one(od, powersave_bias); |
| 445 | declare_show_sampling_rate_min(od); |
Viresh Kumar | 4471a34 | 2012-10-26 00:47:42 +0200 | [diff] [blame] | 446 | |
Viresh Kumar | 4d5dcc4 | 2013-03-27 15:58:58 +0000 | [diff] [blame] | 447 | gov_sys_pol_attr_rw(sampling_rate); |
| 448 | gov_sys_pol_attr_rw(io_is_busy); |
| 449 | gov_sys_pol_attr_rw(up_threshold); |
| 450 | gov_sys_pol_attr_rw(sampling_down_factor); |
| 451 | gov_sys_pol_attr_rw(ignore_nice); |
| 452 | gov_sys_pol_attr_rw(powersave_bias); |
| 453 | gov_sys_pol_attr_ro(sampling_rate_min); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 454 | |
Viresh Kumar | 4d5dcc4 | 2013-03-27 15:58:58 +0000 | [diff] [blame] | 455 | static struct attribute *dbs_attributes_gov_sys[] = { |
| 456 | &sampling_rate_min_gov_sys.attr, |
| 457 | &sampling_rate_gov_sys.attr, |
| 458 | &up_threshold_gov_sys.attr, |
| 459 | &sampling_down_factor_gov_sys.attr, |
| 460 | &ignore_nice_gov_sys.attr, |
| 461 | &powersave_bias_gov_sys.attr, |
| 462 | &io_is_busy_gov_sys.attr, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 463 | NULL |
| 464 | }; |
| 465 | |
Viresh Kumar | 4d5dcc4 | 2013-03-27 15:58:58 +0000 | [diff] [blame] | 466 | static struct attribute_group od_attr_group_gov_sys = { |
| 467 | .attrs = dbs_attributes_gov_sys, |
| 468 | .name = "ondemand", |
| 469 | }; |
| 470 | |
| 471 | static struct attribute *dbs_attributes_gov_pol[] = { |
| 472 | &sampling_rate_min_gov_pol.attr, |
| 473 | &sampling_rate_gov_pol.attr, |
| 474 | &up_threshold_gov_pol.attr, |
| 475 | &sampling_down_factor_gov_pol.attr, |
| 476 | &ignore_nice_gov_pol.attr, |
| 477 | &powersave_bias_gov_pol.attr, |
| 478 | &io_is_busy_gov_pol.attr, |
| 479 | NULL |
| 480 | }; |
| 481 | |
| 482 | static struct attribute_group od_attr_group_gov_pol = { |
| 483 | .attrs = dbs_attributes_gov_pol, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 484 | .name = "ondemand", |
| 485 | }; |
| 486 | |
| 487 | /************************** sysfs end ************************/ |
| 488 | |
Viresh Kumar | 4d5dcc4 | 2013-03-27 15:58:58 +0000 | [diff] [blame] | 489 | static int od_init(struct dbs_data *dbs_data) |
| 490 | { |
| 491 | struct od_dbs_tuners *tuners; |
| 492 | u64 idle_time; |
| 493 | int cpu; |
| 494 | |
| 495 | tuners = kzalloc(sizeof(struct od_dbs_tuners), GFP_KERNEL); |
| 496 | if (!tuners) { |
| 497 | pr_err("%s: kzalloc failed\n", __func__); |
| 498 | return -ENOMEM; |
| 499 | } |
| 500 | |
| 501 | cpu = get_cpu(); |
| 502 | idle_time = get_cpu_idle_time_us(cpu, NULL); |
| 503 | put_cpu(); |
| 504 | if (idle_time != -1ULL) { |
| 505 | /* Idle micro accounting is supported. Use finer thresholds */ |
| 506 | tuners->up_threshold = MICRO_FREQUENCY_UP_THRESHOLD; |
Viresh Kumar | 4d5dcc4 | 2013-03-27 15:58:58 +0000 | [diff] [blame] | 507 | /* |
| 508 | * In nohz/micro accounting case we set the minimum frequency |
| 509 | * not depending on HZ, but fixed (very low). The deferred |
| 510 | * timer might skip some samples if idle/sleeping as needed. |
| 511 | */ |
| 512 | dbs_data->min_sampling_rate = MICRO_FREQUENCY_MIN_SAMPLE_RATE; |
| 513 | } else { |
| 514 | tuners->up_threshold = DEF_FREQUENCY_UP_THRESHOLD; |
Viresh Kumar | 4d5dcc4 | 2013-03-27 15:58:58 +0000 | [diff] [blame] | 515 | |
| 516 | /* For correct statistics, we need 10 ticks for each measure */ |
| 517 | dbs_data->min_sampling_rate = MIN_SAMPLING_RATE_RATIO * |
| 518 | jiffies_to_usecs(10); |
| 519 | } |
| 520 | |
| 521 | tuners->sampling_down_factor = DEF_SAMPLING_DOWN_FACTOR; |
| 522 | tuners->ignore_nice = 0; |
Jacob Shin | c283755 | 2013-06-25 22:42:37 +0200 | [diff] [blame] | 523 | tuners->powersave_bias = default_powersave_bias; |
Viresh Kumar | 4d5dcc4 | 2013-03-27 15:58:58 +0000 | [diff] [blame] | 524 | tuners->io_is_busy = should_io_be_busy(); |
| 525 | |
| 526 | dbs_data->tuners = tuners; |
Viresh Kumar | 4d5dcc4 | 2013-03-27 15:58:58 +0000 | [diff] [blame] | 527 | mutex_init(&dbs_data->mutex); |
| 528 | return 0; |
| 529 | } |
| 530 | |
| 531 | static void od_exit(struct dbs_data *dbs_data) |
| 532 | { |
| 533 | kfree(dbs_data->tuners); |
| 534 | } |
| 535 | |
Viresh Kumar | 4471a34 | 2012-10-26 00:47:42 +0200 | [diff] [blame] | 536 | define_get_cpu_dbs_routines(od_cpu_dbs_info); |
Mike Chan | 00e299f | 2010-01-26 17:06:47 -0800 | [diff] [blame] | 537 | |
Viresh Kumar | 4471a34 | 2012-10-26 00:47:42 +0200 | [diff] [blame] | 538 | static struct od_ops od_ops = { |
Viresh Kumar | 4471a34 | 2012-10-26 00:47:42 +0200 | [diff] [blame] | 539 | .powersave_bias_init_cpu = ondemand_powersave_bias_init_cpu, |
Jacob Shin | fb30809 | 2013-04-02 09:56:56 -0500 | [diff] [blame] | 540 | .powersave_bias_target = generic_powersave_bias_target, |
Viresh Kumar | 4471a34 | 2012-10-26 00:47:42 +0200 | [diff] [blame] | 541 | .freq_increase = dbs_freq_increase, |
| 542 | }; |
| 543 | |
Viresh Kumar | 4d5dcc4 | 2013-03-27 15:58:58 +0000 | [diff] [blame] | 544 | static struct common_dbs_data od_dbs_cdata = { |
Viresh Kumar | 4471a34 | 2012-10-26 00:47:42 +0200 | [diff] [blame] | 545 | .governor = GOV_ONDEMAND, |
Viresh Kumar | 4d5dcc4 | 2013-03-27 15:58:58 +0000 | [diff] [blame] | 546 | .attr_group_gov_sys = &od_attr_group_gov_sys, |
| 547 | .attr_group_gov_pol = &od_attr_group_gov_pol, |
Viresh Kumar | 4471a34 | 2012-10-26 00:47:42 +0200 | [diff] [blame] | 548 | .get_cpu_cdbs = get_cpu_cdbs, |
| 549 | .get_cpu_dbs_info_s = get_cpu_dbs_info_s, |
| 550 | .gov_dbs_timer = od_dbs_timer, |
| 551 | .gov_check_cpu = od_check_cpu, |
| 552 | .gov_ops = &od_ops, |
Viresh Kumar | 4d5dcc4 | 2013-03-27 15:58:58 +0000 | [diff] [blame] | 553 | .init = od_init, |
| 554 | .exit = od_exit, |
Viresh Kumar | 4471a34 | 2012-10-26 00:47:42 +0200 | [diff] [blame] | 555 | }; |
| 556 | |
Jacob Shin | fb30809 | 2013-04-02 09:56:56 -0500 | [diff] [blame] | 557 | static void od_set_powersave_bias(unsigned int powersave_bias) |
| 558 | { |
| 559 | struct cpufreq_policy *policy; |
| 560 | struct dbs_data *dbs_data; |
| 561 | struct od_dbs_tuners *od_tuners; |
| 562 | unsigned int cpu; |
| 563 | cpumask_t done; |
| 564 | |
Jacob Shin | c283755 | 2013-06-25 22:42:37 +0200 | [diff] [blame] | 565 | default_powersave_bias = powersave_bias; |
Jacob Shin | fb30809 | 2013-04-02 09:56:56 -0500 | [diff] [blame] | 566 | cpumask_clear(&done); |
| 567 | |
| 568 | get_online_cpus(); |
| 569 | for_each_online_cpu(cpu) { |
| 570 | if (cpumask_test_cpu(cpu, &done)) |
| 571 | continue; |
| 572 | |
| 573 | policy = per_cpu(od_cpu_dbs_info, cpu).cdbs.cur_policy; |
Jacob Shin | c283755 | 2013-06-25 22:42:37 +0200 | [diff] [blame] | 574 | if (!policy) |
| 575 | continue; |
Jacob Shin | fb30809 | 2013-04-02 09:56:56 -0500 | [diff] [blame] | 576 | |
| 577 | cpumask_or(&done, &done, policy->cpus); |
Jacob Shin | c283755 | 2013-06-25 22:42:37 +0200 | [diff] [blame] | 578 | |
| 579 | if (policy->governor != &cpufreq_gov_ondemand) |
| 580 | continue; |
| 581 | |
| 582 | dbs_data = policy->governor_data; |
| 583 | od_tuners = dbs_data->tuners; |
| 584 | od_tuners->powersave_bias = default_powersave_bias; |
Jacob Shin | fb30809 | 2013-04-02 09:56:56 -0500 | [diff] [blame] | 585 | } |
| 586 | put_online_cpus(); |
| 587 | } |
| 588 | |
| 589 | void od_register_powersave_bias_handler(unsigned int (*f) |
| 590 | (struct cpufreq_policy *, unsigned int, unsigned int), |
| 591 | unsigned int powersave_bias) |
| 592 | { |
| 593 | od_ops.powersave_bias_target = f; |
| 594 | od_set_powersave_bias(powersave_bias); |
| 595 | } |
| 596 | EXPORT_SYMBOL_GPL(od_register_powersave_bias_handler); |
| 597 | |
| 598 | void od_unregister_powersave_bias_handler(void) |
| 599 | { |
| 600 | od_ops.powersave_bias_target = generic_powersave_bias_target; |
| 601 | od_set_powersave_bias(0); |
| 602 | } |
| 603 | EXPORT_SYMBOL_GPL(od_unregister_powersave_bias_handler); |
| 604 | |
Viresh Kumar | 4471a34 | 2012-10-26 00:47:42 +0200 | [diff] [blame] | 605 | static int od_cpufreq_governor_dbs(struct cpufreq_policy *policy, |
| 606 | unsigned int event) |
| 607 | { |
Viresh Kumar | 4d5dcc4 | 2013-03-27 15:58:58 +0000 | [diff] [blame] | 608 | return cpufreq_governor_dbs(policy, &od_dbs_cdata, event); |
Mike Chan | 00e299f | 2010-01-26 17:06:47 -0800 | [diff] [blame] | 609 | } |
| 610 | |
Viresh Kumar | 4471a34 | 2012-10-26 00:47:42 +0200 | [diff] [blame] | 611 | #ifndef CONFIG_CPU_FREQ_DEFAULT_GOV_ONDEMAND |
| 612 | static |
Arjan van de Ven | 19379b1 | 2010-05-09 08:26:51 -0700 | [diff] [blame] | 613 | #endif |
Viresh Kumar | 4471a34 | 2012-10-26 00:47:42 +0200 | [diff] [blame] | 614 | struct cpufreq_governor cpufreq_gov_ondemand = { |
| 615 | .name = "ondemand", |
| 616 | .governor = od_cpufreq_governor_dbs, |
| 617 | .max_transition_latency = TRANSITION_LATENCY_LIMIT, |
| 618 | .owner = THIS_MODULE, |
| 619 | }; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 620 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 621 | static int __init cpufreq_gov_dbs_init(void) |
| 622 | { |
Tejun Heo | 57df557 | 2011-01-26 12:12:50 +0100 | [diff] [blame] | 623 | return cpufreq_register_governor(&cpufreq_gov_ondemand); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 624 | } |
| 625 | |
| 626 | static void __exit cpufreq_gov_dbs_exit(void) |
| 627 | { |
Thomas Renninger | 1c25624 | 2007-10-02 13:28:12 -0700 | [diff] [blame] | 628 | cpufreq_unregister_governor(&cpufreq_gov_ondemand); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 629 | } |
| 630 | |
Venkatesh Pallipadi | ffac80e | 2006-06-28 13:52:18 -0700 | [diff] [blame] | 631 | MODULE_AUTHOR("Venkatesh Pallipadi <venkatesh.pallipadi@intel.com>"); |
| 632 | MODULE_AUTHOR("Alexey Starikovskiy <alexey.y.starikovskiy@intel.com>"); |
| 633 | MODULE_DESCRIPTION("'cpufreq_ondemand' - A dynamic cpufreq governor for " |
Dave Jones | 2b03f89 | 2009-01-18 01:43:44 -0500 | [diff] [blame] | 634 | "Low Latency Frequency Transition capable processors"); |
Venkatesh Pallipadi | ffac80e | 2006-06-28 13:52:18 -0700 | [diff] [blame] | 635 | MODULE_LICENSE("GPL"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 636 | |
Johannes Weiner | 6915719 | 2008-01-17 15:21:08 -0800 | [diff] [blame] | 637 | #ifdef CONFIG_CPU_FREQ_DEFAULT_GOV_ONDEMAND |
| 638 | fs_initcall(cpufreq_gov_dbs_init); |
| 639 | #else |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 640 | module_init(cpufreq_gov_dbs_init); |
Johannes Weiner | 6915719 | 2008-01-17 15:21:08 -0800 | [diff] [blame] | 641 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 642 | module_exit(cpufreq_gov_dbs_exit); |