Dave Jones | b917083 | 2005-05-31 19:03:47 -0700 | [diff] [blame] | 1 | /* |
| 2 | * drivers/cpufreq/cpufreq_conservative.c |
| 3 | * |
| 4 | * Copyright (C) 2001 Russell King |
| 5 | * (C) 2003 Venkatesh Pallipadi <venkatesh.pallipadi@intel.com>. |
| 6 | * Jun Nakajima <jun.nakajima@intel.com> |
Alexander Clouter | 11a80a9c76 | 2009-02-13 19:01:01 +0000 | [diff] [blame] | 7 | * (C) 2009 Alexander Clouter <alex@digriz.org.uk> |
Dave Jones | b917083 | 2005-05-31 19:03:47 -0700 | [diff] [blame] | 8 | * |
| 9 | * This program is free software; you can redistribute it and/or modify |
| 10 | * it under the terms of the GNU General Public License version 2 as |
| 11 | * published by the Free Software Foundation. |
| 12 | */ |
| 13 | |
Viresh Kumar | 4d5dcc4 | 2013-03-27 15:58:58 +0000 | [diff] [blame] | 14 | #include <linux/slab.h> |
Viresh Kumar | 4471a34 | 2012-10-26 00:47:42 +0200 | [diff] [blame] | 15 | #include "cpufreq_governor.h" |
Dave Jones | b917083 | 2005-05-31 19:03:47 -0700 | [diff] [blame] | 16 | |
Stratos Karafotis | c88883c | 2013-02-08 17:24:24 +0000 | [diff] [blame] | 17 | /* Conservative governor macros */ |
Dave Jones | b917083 | 2005-05-31 19:03:47 -0700 | [diff] [blame] | 18 | #define DEF_FREQUENCY_UP_THRESHOLD (80) |
Dave Jones | b917083 | 2005-05-31 19:03:47 -0700 | [diff] [blame] | 19 | #define DEF_FREQUENCY_DOWN_THRESHOLD (20) |
Stratos Karafotis | 9876584 | 2013-03-22 08:03:17 +0000 | [diff] [blame] | 20 | #define DEF_FREQUENCY_STEP (5) |
Alexander Clouter | 2c906b3 | 2006-03-22 09:54:10 +0000 | [diff] [blame] | 21 | #define DEF_SAMPLING_DOWN_FACTOR (1) |
| 22 | #define MAX_SAMPLING_DOWN_FACTOR (10) |
Dave Jones | b917083 | 2005-05-31 19:03:47 -0700 | [diff] [blame] | 23 | |
Viresh Kumar | 4471a34 | 2012-10-26 00:47:42 +0200 | [diff] [blame] | 24 | static DEFINE_PER_CPU(struct cs_cpu_dbs_info_s, cs_cpu_dbs_info); |
Dave Jones | b917083 | 2005-05-31 19:03:47 -0700 | [diff] [blame] | 25 | |
Viresh Kumar | 03d5eec | 2015-09-08 07:10:34 +0530 | [diff] [blame] | 26 | static int cs_cpufreq_governor_dbs(struct cpufreq_policy *policy, |
| 27 | unsigned int event); |
| 28 | |
| 29 | #ifndef CONFIG_CPU_FREQ_DEFAULT_GOV_CONSERVATIVE |
| 30 | static |
| 31 | #endif |
| 32 | struct cpufreq_governor cpufreq_gov_conservative = { |
| 33 | .name = "conservative", |
| 34 | .governor = cs_cpufreq_governor_dbs, |
| 35 | .max_transition_latency = TRANSITION_LATENCY_LIMIT, |
| 36 | .owner = THIS_MODULE, |
| 37 | }; |
| 38 | |
Stratos Karafotis | 9876584 | 2013-03-22 08:03:17 +0000 | [diff] [blame] | 39 | static inline unsigned int get_freq_target(struct cs_dbs_tuners *cs_tuners, |
| 40 | struct cpufreq_policy *policy) |
| 41 | { |
| 42 | unsigned int freq_target = (cs_tuners->freq_step * policy->max) / 100; |
| 43 | |
| 44 | /* max freq cannot be less than 100. But who knows... */ |
| 45 | if (unlikely(freq_target == 0)) |
| 46 | freq_target = DEF_FREQUENCY_STEP; |
| 47 | |
| 48 | return freq_target; |
| 49 | } |
| 50 | |
Viresh Kumar | 4471a34 | 2012-10-26 00:47:42 +0200 | [diff] [blame] | 51 | /* |
| 52 | * Every sampling_rate, we check, if current idle time is less than 20% |
Stratos Karafotis | 7af1c05 | 2013-03-05 22:06:29 +0000 | [diff] [blame] | 53 | * (default), then we try to increase frequency. Every sampling_rate * |
| 54 | * sampling_down_factor, we check, if current idle time is more than 80% |
| 55 | * (default), then we try to decrease frequency |
Viresh Kumar | 4471a34 | 2012-10-26 00:47:42 +0200 | [diff] [blame] | 56 | * |
| 57 | * Any frequency increase takes it to the maximum frequency. Frequency reduction |
| 58 | * happens at minimum steps of 5% (default) of maximum frequency |
| 59 | */ |
| 60 | static void cs_check_cpu(int cpu, unsigned int load) |
Elias Oltmanns | a8d7c3b | 2007-10-22 09:50:13 +0200 | [diff] [blame] | 61 | { |
Viresh Kumar | 4471a34 | 2012-10-26 00:47:42 +0200 | [diff] [blame] | 62 | struct cs_cpu_dbs_info_s *dbs_info = &per_cpu(cs_cpu_dbs_info, cpu); |
Viresh Kumar | 44152cb | 2015-07-18 11:30:59 +0530 | [diff] [blame] | 63 | struct cpufreq_policy *policy = dbs_info->cdbs.shared->policy; |
Viresh Kumar | 4d5dcc4 | 2013-03-27 15:58:58 +0000 | [diff] [blame] | 64 | struct dbs_data *dbs_data = policy->governor_data; |
| 65 | struct cs_dbs_tuners *cs_tuners = dbs_data->tuners; |
Alexander Clouter | f407a08 | 2009-02-13 19:01:51 +0000 | [diff] [blame] | 66 | |
| 67 | /* |
Viresh Kumar | 4471a34 | 2012-10-26 00:47:42 +0200 | [diff] [blame] | 68 | * break out if we 'cannot' reduce the speed as the user might |
| 69 | * want freq_step to be zero |
| 70 | */ |
Viresh Kumar | 4d5dcc4 | 2013-03-27 15:58:58 +0000 | [diff] [blame] | 71 | if (cs_tuners->freq_step == 0) |
Viresh Kumar | 4471a34 | 2012-10-26 00:47:42 +0200 | [diff] [blame] | 72 | return; |
| 73 | |
| 74 | /* Check for frequency increase */ |
Viresh Kumar | 4d5dcc4 | 2013-03-27 15:58:58 +0000 | [diff] [blame] | 75 | if (load > cs_tuners->up_threshold) { |
Viresh Kumar | 4471a34 | 2012-10-26 00:47:42 +0200 | [diff] [blame] | 76 | dbs_info->down_skip = 0; |
| 77 | |
| 78 | /* if we are already at full speed then break out early */ |
| 79 | if (dbs_info->requested_freq == policy->max) |
| 80 | return; |
| 81 | |
Stratos Karafotis | 9876584 | 2013-03-22 08:03:17 +0000 | [diff] [blame] | 82 | dbs_info->requested_freq += get_freq_target(cs_tuners, policy); |
Viresh Kumar | 4471a34 | 2012-10-26 00:47:42 +0200 | [diff] [blame] | 83 | |
Xiaoguang Chen | 6d7bcb1 | 2013-11-08 13:23:52 +0800 | [diff] [blame] | 84 | if (dbs_info->requested_freq > policy->max) |
| 85 | dbs_info->requested_freq = policy->max; |
| 86 | |
Viresh Kumar | 4471a34 | 2012-10-26 00:47:42 +0200 | [diff] [blame] | 87 | __cpufreq_driver_target(policy, dbs_info->requested_freq, |
| 88 | CPUFREQ_RELATION_H); |
| 89 | return; |
| 90 | } |
| 91 | |
Stratos Karafotis | 7af1c05 | 2013-03-05 22:06:29 +0000 | [diff] [blame] | 92 | /* if sampling_down_factor is active break out early */ |
| 93 | if (++dbs_info->down_skip < cs_tuners->sampling_down_factor) |
| 94 | return; |
| 95 | dbs_info->down_skip = 0; |
| 96 | |
Stratos Karafotis | 27ed3cd | 2013-03-05 22:06:40 +0000 | [diff] [blame] | 97 | /* Check for frequency decrease */ |
| 98 | if (load < cs_tuners->down_threshold) { |
Xiaoguang Chen | 3baa976 | 2013-11-07 10:28:50 +0800 | [diff] [blame] | 99 | unsigned int freq_target; |
Viresh Kumar | 4471a34 | 2012-10-26 00:47:42 +0200 | [diff] [blame] | 100 | /* |
| 101 | * if we cannot reduce the frequency anymore, break out early |
| 102 | */ |
| 103 | if (policy->cur == policy->min) |
| 104 | return; |
| 105 | |
Xiaoguang Chen | 3baa976 | 2013-11-07 10:28:50 +0800 | [diff] [blame] | 106 | freq_target = get_freq_target(cs_tuners, policy); |
| 107 | if (dbs_info->requested_freq > freq_target) |
| 108 | dbs_info->requested_freq -= freq_target; |
| 109 | else |
| 110 | dbs_info->requested_freq = policy->min; |
Namhyung Kim | ad529a9 | 2013-02-28 05:38:01 +0000 | [diff] [blame] | 111 | |
Viresh Kumar | 4471a34 | 2012-10-26 00:47:42 +0200 | [diff] [blame] | 112 | __cpufreq_driver_target(policy, dbs_info->requested_freq, |
Namhyung Kim | fed573d | 2013-02-28 05:38:02 +0000 | [diff] [blame] | 113 | CPUFREQ_RELATION_L); |
Viresh Kumar | 4471a34 | 2012-10-26 00:47:42 +0200 | [diff] [blame] | 114 | return; |
| 115 | } |
| 116 | } |
| 117 | |
Viresh Kumar | 43e0ee3 | 2015-07-18 11:31:00 +0530 | [diff] [blame] | 118 | static unsigned int cs_dbs_timer(struct cpu_dbs_info *cdbs, |
| 119 | struct dbs_data *dbs_data, bool modify_all) |
Fabio Baltieri | 66df2a01 | 2012-12-27 14:55:41 +0000 | [diff] [blame] | 120 | { |
Viresh Kumar | 4d5dcc4 | 2013-03-27 15:58:58 +0000 | [diff] [blame] | 121 | struct cs_dbs_tuners *cs_tuners = dbs_data->tuners; |
Fabio Baltieri | 66df2a01 | 2012-12-27 14:55:41 +0000 | [diff] [blame] | 122 | |
Viresh Kumar | 43e0ee3 | 2015-07-18 11:31:00 +0530 | [diff] [blame] | 123 | if (modify_all) |
| 124 | dbs_check_cpu(dbs_data, cdbs->shared->policy->cpu); |
Viresh Kumar | 4447266 | 2013-01-31 17:28:02 +0000 | [diff] [blame] | 125 | |
Viresh Kumar | 43e0ee3 | 2015-07-18 11:31:00 +0530 | [diff] [blame] | 126 | return delay_for_sampling_rate(cs_tuners->sampling_rate); |
Fabio Baltieri | 66df2a01 | 2012-12-27 14:55:41 +0000 | [diff] [blame] | 127 | } |
Viresh Kumar | 4447266 | 2013-01-31 17:28:02 +0000 | [diff] [blame] | 128 | |
Viresh Kumar | 4471a34 | 2012-10-26 00:47:42 +0200 | [diff] [blame] | 129 | static int dbs_cpufreq_notifier(struct notifier_block *nb, unsigned long val, |
| 130 | void *data) |
| 131 | { |
| 132 | struct cpufreq_freqs *freq = data; |
| 133 | struct cs_cpu_dbs_info_s *dbs_info = |
| 134 | &per_cpu(cs_cpu_dbs_info, freq->cpu); |
Viresh Kumar | 03d5eec | 2015-09-08 07:10:34 +0530 | [diff] [blame] | 135 | struct cpufreq_policy *policy = cpufreq_cpu_get_raw(freq->cpu); |
Viresh Kumar | 4471a34 | 2012-10-26 00:47:42 +0200 | [diff] [blame] | 136 | |
Viresh Kumar | 03d5eec | 2015-09-08 07:10:34 +0530 | [diff] [blame] | 137 | if (!policy) |
Viresh Kumar | 4471a34 | 2012-10-26 00:47:42 +0200 | [diff] [blame] | 138 | return 0; |
| 139 | |
Viresh Kumar | 03d5eec | 2015-09-08 07:10:34 +0530 | [diff] [blame] | 140 | /* policy isn't governed by conservative governor */ |
| 141 | if (policy->governor != &cpufreq_gov_conservative) |
| 142 | return 0; |
Viresh Kumar | 4471a34 | 2012-10-26 00:47:42 +0200 | [diff] [blame] | 143 | |
| 144 | /* |
| 145 | * we only care if our internally tracked freq moves outside the 'valid' |
Stratos Karafotis | c88883c | 2013-02-08 17:24:24 +0000 | [diff] [blame] | 146 | * ranges of frequency available to us otherwise we do not change it |
Alexander Clouter | f407a08 | 2009-02-13 19:01:51 +0000 | [diff] [blame] | 147 | */ |
Viresh Kumar | 4471a34 | 2012-10-26 00:47:42 +0200 | [diff] [blame] | 148 | if (dbs_info->requested_freq > policy->max |
| 149 | || dbs_info->requested_freq < policy->min) |
| 150 | dbs_info->requested_freq = freq->new; |
Elias Oltmanns | a8d7c3b | 2007-10-22 09:50:13 +0200 | [diff] [blame] | 151 | |
| 152 | return 0; |
| 153 | } |
| 154 | |
Viresh Kumar | 8e0484d | 2015-06-03 15:57:11 +0530 | [diff] [blame] | 155 | static struct notifier_block cs_cpufreq_notifier_block = { |
| 156 | .notifier_call = dbs_cpufreq_notifier, |
| 157 | }; |
| 158 | |
Dave Jones | b917083 | 2005-05-31 19:03:47 -0700 | [diff] [blame] | 159 | /************************** sysfs interface ************************/ |
Viresh Kumar | 4d5dcc4 | 2013-03-27 15:58:58 +0000 | [diff] [blame] | 160 | static struct common_dbs_data cs_dbs_cdata; |
Dave Jones | b917083 | 2005-05-31 19:03:47 -0700 | [diff] [blame] | 161 | |
Viresh Kumar | 4d5dcc4 | 2013-03-27 15:58:58 +0000 | [diff] [blame] | 162 | static ssize_t store_sampling_down_factor(struct dbs_data *dbs_data, |
| 163 | const char *buf, size_t count) |
Dave Jones | b917083 | 2005-05-31 19:03:47 -0700 | [diff] [blame] | 164 | { |
Viresh Kumar | 4d5dcc4 | 2013-03-27 15:58:58 +0000 | [diff] [blame] | 165 | struct cs_dbs_tuners *cs_tuners = dbs_data->tuners; |
Dave Jones | b917083 | 2005-05-31 19:03:47 -0700 | [diff] [blame] | 166 | unsigned int input; |
| 167 | int ret; |
Dave Jones | 9acef48 | 2009-01-18 01:39:51 -0500 | [diff] [blame] | 168 | ret = sscanf(buf, "%u", &input); |
Alexander Clouter | 8e677ce | 2009-02-13 19:02:34 +0000 | [diff] [blame] | 169 | |
Alexander Clouter | 2c906b3 | 2006-03-22 09:54:10 +0000 | [diff] [blame] | 170 | if (ret != 1 || input > MAX_SAMPLING_DOWN_FACTOR || input < 1) |
Dave Jones | b917083 | 2005-05-31 19:03:47 -0700 | [diff] [blame] | 171 | return -EINVAL; |
| 172 | |
Viresh Kumar | 4d5dcc4 | 2013-03-27 15:58:58 +0000 | [diff] [blame] | 173 | cs_tuners->sampling_down_factor = input; |
Dave Jones | b917083 | 2005-05-31 19:03:47 -0700 | [diff] [blame] | 174 | return count; |
| 175 | } |
| 176 | |
Viresh Kumar | 4d5dcc4 | 2013-03-27 15:58:58 +0000 | [diff] [blame] | 177 | static ssize_t store_sampling_rate(struct dbs_data *dbs_data, const char *buf, |
| 178 | size_t count) |
Dave Jones | b917083 | 2005-05-31 19:03:47 -0700 | [diff] [blame] | 179 | { |
Viresh Kumar | 4d5dcc4 | 2013-03-27 15:58:58 +0000 | [diff] [blame] | 180 | struct cs_dbs_tuners *cs_tuners = dbs_data->tuners; |
Dave Jones | b917083 | 2005-05-31 19:03:47 -0700 | [diff] [blame] | 181 | unsigned int input; |
| 182 | int ret; |
Dave Jones | 9acef48 | 2009-01-18 01:39:51 -0500 | [diff] [blame] | 183 | ret = sscanf(buf, "%u", &input); |
Dave Jones | b917083 | 2005-05-31 19:03:47 -0700 | [diff] [blame] | 184 | |
Alexander Clouter | 8e677ce | 2009-02-13 19:02:34 +0000 | [diff] [blame] | 185 | if (ret != 1) |
Dave Jones | b917083 | 2005-05-31 19:03:47 -0700 | [diff] [blame] | 186 | return -EINVAL; |
Alexander Clouter | 8e677ce | 2009-02-13 19:02:34 +0000 | [diff] [blame] | 187 | |
Viresh Kumar | 4d5dcc4 | 2013-03-27 15:58:58 +0000 | [diff] [blame] | 188 | cs_tuners->sampling_rate = max(input, dbs_data->min_sampling_rate); |
Dave Jones | b917083 | 2005-05-31 19:03:47 -0700 | [diff] [blame] | 189 | return count; |
| 190 | } |
| 191 | |
Viresh Kumar | 4d5dcc4 | 2013-03-27 15:58:58 +0000 | [diff] [blame] | 192 | static ssize_t store_up_threshold(struct dbs_data *dbs_data, const char *buf, |
| 193 | size_t count) |
Dave Jones | b917083 | 2005-05-31 19:03:47 -0700 | [diff] [blame] | 194 | { |
Viresh Kumar | 4d5dcc4 | 2013-03-27 15:58:58 +0000 | [diff] [blame] | 195 | struct cs_dbs_tuners *cs_tuners = dbs_data->tuners; |
Dave Jones | b917083 | 2005-05-31 19:03:47 -0700 | [diff] [blame] | 196 | unsigned int input; |
| 197 | int ret; |
Dave Jones | 9acef48 | 2009-01-18 01:39:51 -0500 | [diff] [blame] | 198 | ret = sscanf(buf, "%u", &input); |
Dave Jones | b917083 | 2005-05-31 19:03:47 -0700 | [diff] [blame] | 199 | |
Viresh Kumar | 4d5dcc4 | 2013-03-27 15:58:58 +0000 | [diff] [blame] | 200 | if (ret != 1 || input > 100 || input <= cs_tuners->down_threshold) |
Dave Jones | b917083 | 2005-05-31 19:03:47 -0700 | [diff] [blame] | 201 | return -EINVAL; |
Dave Jones | b917083 | 2005-05-31 19:03:47 -0700 | [diff] [blame] | 202 | |
Viresh Kumar | 4d5dcc4 | 2013-03-27 15:58:58 +0000 | [diff] [blame] | 203 | cs_tuners->up_threshold = input; |
Dave Jones | b917083 | 2005-05-31 19:03:47 -0700 | [diff] [blame] | 204 | return count; |
| 205 | } |
| 206 | |
Viresh Kumar | 4d5dcc4 | 2013-03-27 15:58:58 +0000 | [diff] [blame] | 207 | static ssize_t store_down_threshold(struct dbs_data *dbs_data, const char *buf, |
| 208 | size_t count) |
Dave Jones | b917083 | 2005-05-31 19:03:47 -0700 | [diff] [blame] | 209 | { |
Viresh Kumar | 4d5dcc4 | 2013-03-27 15:58:58 +0000 | [diff] [blame] | 210 | struct cs_dbs_tuners *cs_tuners = dbs_data->tuners; |
Dave Jones | b917083 | 2005-05-31 19:03:47 -0700 | [diff] [blame] | 211 | unsigned int input; |
| 212 | int ret; |
Dave Jones | 9acef48 | 2009-01-18 01:39:51 -0500 | [diff] [blame] | 213 | ret = sscanf(buf, "%u", &input); |
Dave Jones | b917083 | 2005-05-31 19:03:47 -0700 | [diff] [blame] | 214 | |
Alexander Clouter | 8e677ce | 2009-02-13 19:02:34 +0000 | [diff] [blame] | 215 | /* cannot be lower than 11 otherwise freq will not fall */ |
| 216 | if (ret != 1 || input < 11 || input > 100 || |
Viresh Kumar | 4d5dcc4 | 2013-03-27 15:58:58 +0000 | [diff] [blame] | 217 | input >= cs_tuners->up_threshold) |
Dave Jones | b917083 | 2005-05-31 19:03:47 -0700 | [diff] [blame] | 218 | return -EINVAL; |
Dave Jones | b917083 | 2005-05-31 19:03:47 -0700 | [diff] [blame] | 219 | |
Viresh Kumar | 4d5dcc4 | 2013-03-27 15:58:58 +0000 | [diff] [blame] | 220 | cs_tuners->down_threshold = input; |
Dave Jones | b917083 | 2005-05-31 19:03:47 -0700 | [diff] [blame] | 221 | return count; |
| 222 | } |
| 223 | |
Viresh Kumar | 6c4640c | 2013-08-05 12:28:02 +0530 | [diff] [blame] | 224 | static ssize_t store_ignore_nice_load(struct dbs_data *dbs_data, |
| 225 | const char *buf, size_t count) |
Dave Jones | b917083 | 2005-05-31 19:03:47 -0700 | [diff] [blame] | 226 | { |
Viresh Kumar | 4d5dcc4 | 2013-03-27 15:58:58 +0000 | [diff] [blame] | 227 | struct cs_dbs_tuners *cs_tuners = dbs_data->tuners; |
Viresh Kumar | 4471a34 | 2012-10-26 00:47:42 +0200 | [diff] [blame] | 228 | unsigned int input, j; |
Dave Jones | b917083 | 2005-05-31 19:03:47 -0700 | [diff] [blame] | 229 | int ret; |
| 230 | |
Dave Jones | 18a7247 | 2007-10-22 16:49:09 -0400 | [diff] [blame] | 231 | ret = sscanf(buf, "%u", &input); |
| 232 | if (ret != 1) |
Dave Jones | b917083 | 2005-05-31 19:03:47 -0700 | [diff] [blame] | 233 | return -EINVAL; |
| 234 | |
Dave Jones | 18a7247 | 2007-10-22 16:49:09 -0400 | [diff] [blame] | 235 | if (input > 1) |
Dave Jones | b917083 | 2005-05-31 19:03:47 -0700 | [diff] [blame] | 236 | input = 1; |
Dave Jones | 18a7247 | 2007-10-22 16:49:09 -0400 | [diff] [blame] | 237 | |
Viresh Kumar | 6c4640c | 2013-08-05 12:28:02 +0530 | [diff] [blame] | 238 | if (input == cs_tuners->ignore_nice_load) /* nothing to do */ |
Dave Jones | b917083 | 2005-05-31 19:03:47 -0700 | [diff] [blame] | 239 | return count; |
Thomas Renninger | 326c86d | 2011-03-03 21:31:27 +0100 | [diff] [blame] | 240 | |
Viresh Kumar | 6c4640c | 2013-08-05 12:28:02 +0530 | [diff] [blame] | 241 | cs_tuners->ignore_nice_load = input; |
Dave Jones | b917083 | 2005-05-31 19:03:47 -0700 | [diff] [blame] | 242 | |
Alexander Clouter | 8e677ce | 2009-02-13 19:02:34 +0000 | [diff] [blame] | 243 | /* we need to re-evaluate prev_cpu_idle */ |
Dave Jones | dac1c1a | 2005-05-31 19:03:49 -0700 | [diff] [blame] | 244 | for_each_online_cpu(j) { |
Viresh Kumar | 4471a34 | 2012-10-26 00:47:42 +0200 | [diff] [blame] | 245 | struct cs_cpu_dbs_info_s *dbs_info; |
Tejun Heo | 245b2e7 | 2009-06-24 15:13:48 +0900 | [diff] [blame] | 246 | dbs_info = &per_cpu(cs_cpu_dbs_info, j); |
Viresh Kumar | 4471a34 | 2012-10-26 00:47:42 +0200 | [diff] [blame] | 247 | dbs_info->cdbs.prev_cpu_idle = get_cpu_idle_time(j, |
Stratos Karafotis | 9366d84 | 2013-02-28 16:57:32 +0000 | [diff] [blame] | 248 | &dbs_info->cdbs.prev_cpu_wall, 0); |
Viresh Kumar | 6c4640c | 2013-08-05 12:28:02 +0530 | [diff] [blame] | 249 | if (cs_tuners->ignore_nice_load) |
Viresh Kumar | 4471a34 | 2012-10-26 00:47:42 +0200 | [diff] [blame] | 250 | dbs_info->cdbs.prev_cpu_nice = |
| 251 | kcpustat_cpu(j).cpustat[CPUTIME_NICE]; |
Dave Jones | b917083 | 2005-05-31 19:03:47 -0700 | [diff] [blame] | 252 | } |
Dave Jones | b917083 | 2005-05-31 19:03:47 -0700 | [diff] [blame] | 253 | return count; |
| 254 | } |
| 255 | |
Viresh Kumar | 4d5dcc4 | 2013-03-27 15:58:58 +0000 | [diff] [blame] | 256 | static ssize_t store_freq_step(struct dbs_data *dbs_data, const char *buf, |
| 257 | size_t count) |
Dave Jones | b917083 | 2005-05-31 19:03:47 -0700 | [diff] [blame] | 258 | { |
Viresh Kumar | 4d5dcc4 | 2013-03-27 15:58:58 +0000 | [diff] [blame] | 259 | struct cs_dbs_tuners *cs_tuners = dbs_data->tuners; |
Dave Jones | b917083 | 2005-05-31 19:03:47 -0700 | [diff] [blame] | 260 | unsigned int input; |
| 261 | int ret; |
Dave Jones | 18a7247 | 2007-10-22 16:49:09 -0400 | [diff] [blame] | 262 | ret = sscanf(buf, "%u", &input); |
Dave Jones | b917083 | 2005-05-31 19:03:47 -0700 | [diff] [blame] | 263 | |
Dave Jones | 18a7247 | 2007-10-22 16:49:09 -0400 | [diff] [blame] | 264 | if (ret != 1) |
Dave Jones | b917083 | 2005-05-31 19:03:47 -0700 | [diff] [blame] | 265 | return -EINVAL; |
| 266 | |
Dave Jones | 18a7247 | 2007-10-22 16:49:09 -0400 | [diff] [blame] | 267 | if (input > 100) |
Dave Jones | b917083 | 2005-05-31 19:03:47 -0700 | [diff] [blame] | 268 | input = 100; |
Dave Jones | 18a7247 | 2007-10-22 16:49:09 -0400 | [diff] [blame] | 269 | |
Viresh Kumar | 4471a34 | 2012-10-26 00:47:42 +0200 | [diff] [blame] | 270 | /* |
| 271 | * no need to test here if freq_step is zero as the user might actually |
| 272 | * want this, they would be crazy though :) |
| 273 | */ |
Viresh Kumar | 4d5dcc4 | 2013-03-27 15:58:58 +0000 | [diff] [blame] | 274 | cs_tuners->freq_step = input; |
Dave Jones | b917083 | 2005-05-31 19:03:47 -0700 | [diff] [blame] | 275 | return count; |
| 276 | } |
| 277 | |
Viresh Kumar | 4d5dcc4 | 2013-03-27 15:58:58 +0000 | [diff] [blame] | 278 | show_store_one(cs, sampling_rate); |
| 279 | show_store_one(cs, sampling_down_factor); |
| 280 | show_store_one(cs, up_threshold); |
| 281 | show_store_one(cs, down_threshold); |
Viresh Kumar | 6c4640c | 2013-08-05 12:28:02 +0530 | [diff] [blame] | 282 | show_store_one(cs, ignore_nice_load); |
Viresh Kumar | 4d5dcc4 | 2013-03-27 15:58:58 +0000 | [diff] [blame] | 283 | show_store_one(cs, freq_step); |
| 284 | declare_show_sampling_rate_min(cs); |
Viresh Kumar | 4471a34 | 2012-10-26 00:47:42 +0200 | [diff] [blame] | 285 | |
Viresh Kumar | 4d5dcc4 | 2013-03-27 15:58:58 +0000 | [diff] [blame] | 286 | gov_sys_pol_attr_rw(sampling_rate); |
| 287 | gov_sys_pol_attr_rw(sampling_down_factor); |
| 288 | gov_sys_pol_attr_rw(up_threshold); |
| 289 | gov_sys_pol_attr_rw(down_threshold); |
Viresh Kumar | 6c4640c | 2013-08-05 12:28:02 +0530 | [diff] [blame] | 290 | gov_sys_pol_attr_rw(ignore_nice_load); |
Viresh Kumar | 4d5dcc4 | 2013-03-27 15:58:58 +0000 | [diff] [blame] | 291 | gov_sys_pol_attr_rw(freq_step); |
| 292 | gov_sys_pol_attr_ro(sampling_rate_min); |
Dave Jones | b917083 | 2005-05-31 19:03:47 -0700 | [diff] [blame] | 293 | |
Viresh Kumar | 4d5dcc4 | 2013-03-27 15:58:58 +0000 | [diff] [blame] | 294 | static struct attribute *dbs_attributes_gov_sys[] = { |
| 295 | &sampling_rate_min_gov_sys.attr, |
| 296 | &sampling_rate_gov_sys.attr, |
| 297 | &sampling_down_factor_gov_sys.attr, |
| 298 | &up_threshold_gov_sys.attr, |
| 299 | &down_threshold_gov_sys.attr, |
Viresh Kumar | 6c4640c | 2013-08-05 12:28:02 +0530 | [diff] [blame] | 300 | &ignore_nice_load_gov_sys.attr, |
Viresh Kumar | 4d5dcc4 | 2013-03-27 15:58:58 +0000 | [diff] [blame] | 301 | &freq_step_gov_sys.attr, |
Dave Jones | b917083 | 2005-05-31 19:03:47 -0700 | [diff] [blame] | 302 | NULL |
| 303 | }; |
| 304 | |
Viresh Kumar | 4d5dcc4 | 2013-03-27 15:58:58 +0000 | [diff] [blame] | 305 | static struct attribute_group cs_attr_group_gov_sys = { |
| 306 | .attrs = dbs_attributes_gov_sys, |
| 307 | .name = "conservative", |
| 308 | }; |
| 309 | |
| 310 | static struct attribute *dbs_attributes_gov_pol[] = { |
| 311 | &sampling_rate_min_gov_pol.attr, |
| 312 | &sampling_rate_gov_pol.attr, |
| 313 | &sampling_down_factor_gov_pol.attr, |
| 314 | &up_threshold_gov_pol.attr, |
| 315 | &down_threshold_gov_pol.attr, |
Viresh Kumar | 6c4640c | 2013-08-05 12:28:02 +0530 | [diff] [blame] | 316 | &ignore_nice_load_gov_pol.attr, |
Viresh Kumar | 4d5dcc4 | 2013-03-27 15:58:58 +0000 | [diff] [blame] | 317 | &freq_step_gov_pol.attr, |
| 318 | NULL |
| 319 | }; |
| 320 | |
| 321 | static struct attribute_group cs_attr_group_gov_pol = { |
| 322 | .attrs = dbs_attributes_gov_pol, |
Dave Jones | b917083 | 2005-05-31 19:03:47 -0700 | [diff] [blame] | 323 | .name = "conservative", |
| 324 | }; |
| 325 | |
| 326 | /************************** sysfs end ************************/ |
| 327 | |
Viresh Kumar | 8e0484d | 2015-06-03 15:57:11 +0530 | [diff] [blame] | 328 | static int cs_init(struct dbs_data *dbs_data, bool notify) |
Viresh Kumar | 4d5dcc4 | 2013-03-27 15:58:58 +0000 | [diff] [blame] | 329 | { |
| 330 | struct cs_dbs_tuners *tuners; |
| 331 | |
Viresh Kumar | d5b73cd | 2013-08-06 22:53:06 +0530 | [diff] [blame] | 332 | tuners = kzalloc(sizeof(*tuners), GFP_KERNEL); |
Viresh Kumar | 4d5dcc4 | 2013-03-27 15:58:58 +0000 | [diff] [blame] | 333 | if (!tuners) { |
| 334 | pr_err("%s: kzalloc failed\n", __func__); |
| 335 | return -ENOMEM; |
| 336 | } |
| 337 | |
| 338 | tuners->up_threshold = DEF_FREQUENCY_UP_THRESHOLD; |
| 339 | tuners->down_threshold = DEF_FREQUENCY_DOWN_THRESHOLD; |
| 340 | tuners->sampling_down_factor = DEF_SAMPLING_DOWN_FACTOR; |
Viresh Kumar | 6c4640c | 2013-08-05 12:28:02 +0530 | [diff] [blame] | 341 | tuners->ignore_nice_load = 0; |
Stratos Karafotis | 9876584 | 2013-03-22 08:03:17 +0000 | [diff] [blame] | 342 | tuners->freq_step = DEF_FREQUENCY_STEP; |
Viresh Kumar | 4d5dcc4 | 2013-03-27 15:58:58 +0000 | [diff] [blame] | 343 | |
| 344 | dbs_data->tuners = tuners; |
| 345 | dbs_data->min_sampling_rate = MIN_SAMPLING_RATE_RATIO * |
| 346 | jiffies_to_usecs(10); |
Viresh Kumar | 8e0484d | 2015-06-03 15:57:11 +0530 | [diff] [blame] | 347 | |
| 348 | if (notify) |
| 349 | cpufreq_register_notifier(&cs_cpufreq_notifier_block, |
| 350 | CPUFREQ_TRANSITION_NOTIFIER); |
| 351 | |
Viresh Kumar | 4d5dcc4 | 2013-03-27 15:58:58 +0000 | [diff] [blame] | 352 | return 0; |
| 353 | } |
| 354 | |
Viresh Kumar | 8e0484d | 2015-06-03 15:57:11 +0530 | [diff] [blame] | 355 | static void cs_exit(struct dbs_data *dbs_data, bool notify) |
Viresh Kumar | 4d5dcc4 | 2013-03-27 15:58:58 +0000 | [diff] [blame] | 356 | { |
Viresh Kumar | 8e0484d | 2015-06-03 15:57:11 +0530 | [diff] [blame] | 357 | if (notify) |
| 358 | cpufreq_unregister_notifier(&cs_cpufreq_notifier_block, |
| 359 | CPUFREQ_TRANSITION_NOTIFIER); |
| 360 | |
Viresh Kumar | 4d5dcc4 | 2013-03-27 15:58:58 +0000 | [diff] [blame] | 361 | kfree(dbs_data->tuners); |
| 362 | } |
| 363 | |
Viresh Kumar | 4471a34 | 2012-10-26 00:47:42 +0200 | [diff] [blame] | 364 | define_get_cpu_dbs_routines(cs_cpu_dbs_info); |
Dave Jones | b917083 | 2005-05-31 19:03:47 -0700 | [diff] [blame] | 365 | |
Viresh Kumar | 4d5dcc4 | 2013-03-27 15:58:58 +0000 | [diff] [blame] | 366 | static struct common_dbs_data cs_dbs_cdata = { |
Viresh Kumar | 4471a34 | 2012-10-26 00:47:42 +0200 | [diff] [blame] | 367 | .governor = GOV_CONSERVATIVE, |
Viresh Kumar | 4d5dcc4 | 2013-03-27 15:58:58 +0000 | [diff] [blame] | 368 | .attr_group_gov_sys = &cs_attr_group_gov_sys, |
| 369 | .attr_group_gov_pol = &cs_attr_group_gov_pol, |
Viresh Kumar | 4471a34 | 2012-10-26 00:47:42 +0200 | [diff] [blame] | 370 | .get_cpu_cdbs = get_cpu_cdbs, |
| 371 | .get_cpu_dbs_info_s = get_cpu_dbs_info_s, |
| 372 | .gov_dbs_timer = cs_dbs_timer, |
| 373 | .gov_check_cpu = cs_check_cpu, |
Viresh Kumar | 4d5dcc4 | 2013-03-27 15:58:58 +0000 | [diff] [blame] | 374 | .init = cs_init, |
| 375 | .exit = cs_exit, |
Viresh Kumar | 732b6d6 | 2015-06-03 15:57:13 +0530 | [diff] [blame] | 376 | .mutex = __MUTEX_INITIALIZER(cs_dbs_cdata.mutex), |
Viresh Kumar | 4471a34 | 2012-10-26 00:47:42 +0200 | [diff] [blame] | 377 | }; |
Dave Jones | b917083 | 2005-05-31 19:03:47 -0700 | [diff] [blame] | 378 | |
Viresh Kumar | 4471a34 | 2012-10-26 00:47:42 +0200 | [diff] [blame] | 379 | static int cs_cpufreq_governor_dbs(struct cpufreq_policy *policy, |
Dave Jones | b917083 | 2005-05-31 19:03:47 -0700 | [diff] [blame] | 380 | unsigned int event) |
| 381 | { |
Viresh Kumar | 4d5dcc4 | 2013-03-27 15:58:58 +0000 | [diff] [blame] | 382 | return cpufreq_governor_dbs(policy, &cs_dbs_cdata, event); |
Dave Jones | b917083 | 2005-05-31 19:03:47 -0700 | [diff] [blame] | 383 | } |
| 384 | |
Dave Jones | b917083 | 2005-05-31 19:03:47 -0700 | [diff] [blame] | 385 | static int __init cpufreq_gov_dbs_init(void) |
| 386 | { |
Tejun Heo | 57df557 | 2011-01-26 12:12:50 +0100 | [diff] [blame] | 387 | return cpufreq_register_governor(&cpufreq_gov_conservative); |
Dave Jones | b917083 | 2005-05-31 19:03:47 -0700 | [diff] [blame] | 388 | } |
| 389 | |
| 390 | static void __exit cpufreq_gov_dbs_exit(void) |
| 391 | { |
Thomas Renninger | 1c25624 | 2007-10-02 13:28:12 -0700 | [diff] [blame] | 392 | cpufreq_unregister_governor(&cpufreq_gov_conservative); |
Dave Jones | b917083 | 2005-05-31 19:03:47 -0700 | [diff] [blame] | 393 | } |
| 394 | |
Alexander Clouter | 11a80a9c76 | 2009-02-13 19:01:01 +0000 | [diff] [blame] | 395 | MODULE_AUTHOR("Alexander Clouter <alex@digriz.org.uk>"); |
Dave Jones | 9acef48 | 2009-01-18 01:39:51 -0500 | [diff] [blame] | 396 | MODULE_DESCRIPTION("'cpufreq_conservative' - A dynamic cpufreq governor for " |
Dave Jones | b917083 | 2005-05-31 19:03:47 -0700 | [diff] [blame] | 397 | "Low Latency Frequency Transition capable processors " |
| 398 | "optimised for use in a battery environment"); |
Dave Jones | 9acef48 | 2009-01-18 01:39:51 -0500 | [diff] [blame] | 399 | MODULE_LICENSE("GPL"); |
Dave Jones | b917083 | 2005-05-31 19:03:47 -0700 | [diff] [blame] | 400 | |
Johannes Weiner | 6915719 | 2008-01-17 15:21:08 -0800 | [diff] [blame] | 401 | #ifdef CONFIG_CPU_FREQ_DEFAULT_GOV_CONSERVATIVE |
| 402 | fs_initcall(cpufreq_gov_dbs_init); |
| 403 | #else |
Dave Jones | b917083 | 2005-05-31 19:03:47 -0700 | [diff] [blame] | 404 | module_init(cpufreq_gov_dbs_init); |
Johannes Weiner | 6915719 | 2008-01-17 15:21:08 -0800 | [diff] [blame] | 405 | #endif |
Dave Jones | b917083 | 2005-05-31 19:03:47 -0700 | [diff] [blame] | 406 | module_exit(cpufreq_gov_dbs_exit); |