Thomas Gleixner | d2912cb | 2019-06-04 10:11:33 +0200 | [diff] [blame] | 1 | // SPDX-License-Identifier: GPL-2.0-only |
Dave Jones | b917083 | 2005-05-31 19:03:47 -0700 | [diff] [blame] | 2 | /* |
| 3 | * drivers/cpufreq/cpufreq_conservative.c |
| 4 | * |
| 5 | * Copyright (C) 2001 Russell King |
| 6 | * (C) 2003 Venkatesh Pallipadi <venkatesh.pallipadi@intel.com>. |
| 7 | * Jun Nakajima <jun.nakajima@intel.com> |
Alexander Clouter | 11a80a9c76 | 2009-02-13 19:01:01 +0000 | [diff] [blame] | 8 | * (C) 2009 Alexander Clouter <alex@digriz.org.uk> |
Dave Jones | b917083 | 2005-05-31 19:03:47 -0700 | [diff] [blame] | 9 | */ |
| 10 | |
Viresh Kumar | 4d5dcc4 | 2013-03-27 15:58:58 +0000 | [diff] [blame] | 11 | #include <linux/slab.h> |
Viresh Kumar | 4471a34 | 2012-10-26 00:47:42 +0200 | [diff] [blame] | 12 | #include "cpufreq_governor.h" |
Dave Jones | b917083 | 2005-05-31 19:03:47 -0700 | [diff] [blame] | 13 | |
Rafael J. Wysocki | 7d5a995 | 2016-02-18 18:40:14 +0100 | [diff] [blame] | 14 | struct cs_policy_dbs_info { |
| 15 | struct policy_dbs_info policy_dbs; |
| 16 | unsigned int down_skip; |
Rafael J. Wysocki | abb6627 | 2016-10-12 21:47:03 +0200 | [diff] [blame] | 17 | unsigned int requested_freq; |
Rafael J. Wysocki | 7d5a995 | 2016-02-18 18:40:14 +0100 | [diff] [blame] | 18 | }; |
| 19 | |
| 20 | static inline struct cs_policy_dbs_info *to_dbs_info(struct policy_dbs_info *policy_dbs) |
| 21 | { |
| 22 | return container_of(policy_dbs, struct cs_policy_dbs_info, policy_dbs); |
| 23 | } |
| 24 | |
Rafael J. Wysocki | 47ebaac1 | 2016-02-18 18:41:36 +0100 | [diff] [blame] | 25 | struct cs_dbs_tuners { |
| 26 | unsigned int down_threshold; |
| 27 | unsigned int freq_step; |
| 28 | }; |
| 29 | |
Stratos Karafotis | c88883c | 2013-02-08 17:24:24 +0000 | [diff] [blame] | 30 | /* Conservative governor macros */ |
Dave Jones | b917083 | 2005-05-31 19:03:47 -0700 | [diff] [blame] | 31 | #define DEF_FREQUENCY_UP_THRESHOLD (80) |
Dave Jones | b917083 | 2005-05-31 19:03:47 -0700 | [diff] [blame] | 32 | #define DEF_FREQUENCY_DOWN_THRESHOLD (20) |
Stratos Karafotis | 9876584 | 2013-03-22 08:03:17 +0000 | [diff] [blame] | 33 | #define DEF_FREQUENCY_STEP (5) |
Alexander Clouter | 2c906b3 | 2006-03-22 09:54:10 +0000 | [diff] [blame] | 34 | #define DEF_SAMPLING_DOWN_FACTOR (1) |
| 35 | #define MAX_SAMPLING_DOWN_FACTOR (10) |
Dave Jones | b917083 | 2005-05-31 19:03:47 -0700 | [diff] [blame] | 36 | |
Viresh Kumar | d5f905a | 2016-11-14 12:30:43 +0530 | [diff] [blame] | 37 | static inline unsigned int get_freq_step(struct cs_dbs_tuners *cs_tuners, |
| 38 | struct cpufreq_policy *policy) |
Stratos Karafotis | 9876584 | 2013-03-22 08:03:17 +0000 | [diff] [blame] | 39 | { |
Viresh Kumar | d5f905a | 2016-11-14 12:30:43 +0530 | [diff] [blame] | 40 | unsigned int freq_step = (cs_tuners->freq_step * policy->max) / 100; |
Stratos Karafotis | 9876584 | 2013-03-22 08:03:17 +0000 | [diff] [blame] | 41 | |
| 42 | /* max freq cannot be less than 100. But who knows... */ |
Viresh Kumar | d5f905a | 2016-11-14 12:30:43 +0530 | [diff] [blame] | 43 | if (unlikely(freq_step == 0)) |
| 44 | freq_step = DEF_FREQUENCY_STEP; |
Stratos Karafotis | 9876584 | 2013-03-22 08:03:17 +0000 | [diff] [blame] | 45 | |
Viresh Kumar | d5f905a | 2016-11-14 12:30:43 +0530 | [diff] [blame] | 46 | return freq_step; |
Stratos Karafotis | 9876584 | 2013-03-22 08:03:17 +0000 | [diff] [blame] | 47 | } |
| 48 | |
Viresh Kumar | 4471a34 | 2012-10-26 00:47:42 +0200 | [diff] [blame] | 49 | /* |
| 50 | * 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] | 51 | * (default), then we try to increase frequency. Every sampling_rate * |
| 52 | * sampling_down_factor, we check, if current idle time is more than 80% |
| 53 | * (default), then we try to decrease frequency |
Viresh Kumar | 4471a34 | 2012-10-26 00:47:42 +0200 | [diff] [blame] | 54 | * |
Stratos Karafotis | 42d951c | 2016-11-16 21:27:22 +0200 | [diff] [blame] | 55 | * Frequency updates happen at minimum steps of 5% (default) of maximum |
| 56 | * frequency |
Viresh Kumar | 4471a34 | 2012-10-26 00:47:42 +0200 | [diff] [blame] | 57 | */ |
Viresh Kumar | 26f0dbc | 2016-11-08 11:06:33 +0530 | [diff] [blame] | 58 | static unsigned int cs_dbs_update(struct cpufreq_policy *policy) |
Elias Oltmanns | a8d7c3b | 2007-10-22 09:50:13 +0200 | [diff] [blame] | 59 | { |
Rafael J. Wysocki | bc50547 | 2016-02-07 16:24:26 +0100 | [diff] [blame] | 60 | struct policy_dbs_info *policy_dbs = policy->governor_data; |
Rafael J. Wysocki | 7d5a995 | 2016-02-18 18:40:14 +0100 | [diff] [blame] | 61 | struct cs_policy_dbs_info *dbs_info = to_dbs_info(policy_dbs); |
Rafael J. Wysocki | abb6627 | 2016-10-12 21:47:03 +0200 | [diff] [blame] | 62 | unsigned int requested_freq = dbs_info->requested_freq; |
Rafael J. Wysocki | bc50547 | 2016-02-07 16:24:26 +0100 | [diff] [blame] | 63 | struct dbs_data *dbs_data = policy_dbs->dbs_data; |
Viresh Kumar | 4d5dcc4 | 2013-03-27 15:58:58 +0000 | [diff] [blame] | 64 | struct cs_dbs_tuners *cs_tuners = dbs_data->tuners; |
Rafael J. Wysocki | 4cccf75 | 2016-02-15 02:19:31 +0100 | [diff] [blame] | 65 | unsigned int load = dbs_update(policy); |
Stratos Karafotis | 00bfe05 | 2016-11-16 19:26:29 +0200 | [diff] [blame] | 66 | unsigned int freq_step; |
Alexander Clouter | f407a08 | 2009-02-13 19:01:51 +0000 | [diff] [blame] | 67 | |
| 68 | /* |
Viresh Kumar | 4471a34 | 2012-10-26 00:47:42 +0200 | [diff] [blame] | 69 | * break out if we 'cannot' reduce the speed as the user might |
| 70 | * want freq_step to be zero |
| 71 | */ |
Viresh Kumar | 4d5dcc4 | 2013-03-27 15:58:58 +0000 | [diff] [blame] | 72 | if (cs_tuners->freq_step == 0) |
Rafael J. Wysocki | 4cccf75 | 2016-02-15 02:19:31 +0100 | [diff] [blame] | 73 | goto out; |
Viresh Kumar | 4471a34 | 2012-10-26 00:47:42 +0200 | [diff] [blame] | 74 | |
Rafael J. Wysocki | abb6627 | 2016-10-12 21:47:03 +0200 | [diff] [blame] | 75 | /* |
| 76 | * If requested_freq is out of range, it is likely that the limits |
| 77 | * changed in the meantime, so fall back to current frequency in that |
| 78 | * case. |
| 79 | */ |
Rafael J. Wysocki | da5e79b | 2018-10-15 23:21:05 +0200 | [diff] [blame] | 80 | if (requested_freq > policy->max || requested_freq < policy->min) { |
Rafael J. Wysocki | abb6627 | 2016-10-12 21:47:03 +0200 | [diff] [blame] | 81 | requested_freq = policy->cur; |
Rafael J. Wysocki | da5e79b | 2018-10-15 23:21:05 +0200 | [diff] [blame] | 82 | dbs_info->requested_freq = requested_freq; |
| 83 | } |
Rafael J. Wysocki | abb6627 | 2016-10-12 21:47:03 +0200 | [diff] [blame] | 84 | |
Stratos Karafotis | 00bfe05 | 2016-11-16 19:26:29 +0200 | [diff] [blame] | 85 | freq_step = get_freq_step(cs_tuners, policy); |
| 86 | |
| 87 | /* |
| 88 | * Decrease requested_freq one freq_step for each idle period that |
| 89 | * we didn't update the frequency. |
| 90 | */ |
| 91 | if (policy_dbs->idle_periods < UINT_MAX) { |
| 92 | unsigned int freq_steps = policy_dbs->idle_periods * freq_step; |
| 93 | |
Rafael J. Wysocki | da5e79b | 2018-10-15 23:21:05 +0200 | [diff] [blame] | 94 | if (requested_freq > policy->min + freq_steps) |
Stratos Karafotis | 00bfe05 | 2016-11-16 19:26:29 +0200 | [diff] [blame] | 95 | requested_freq -= freq_steps; |
| 96 | else |
| 97 | requested_freq = policy->min; |
| 98 | |
| 99 | policy_dbs->idle_periods = UINT_MAX; |
| 100 | } |
| 101 | |
Viresh Kumar | 4471a34 | 2012-10-26 00:47:42 +0200 | [diff] [blame] | 102 | /* Check for frequency increase */ |
Viresh Kumar | ff4b178 | 2016-02-09 09:01:32 +0530 | [diff] [blame] | 103 | if (load > dbs_data->up_threshold) { |
Viresh Kumar | 4471a34 | 2012-10-26 00:47:42 +0200 | [diff] [blame] | 104 | dbs_info->down_skip = 0; |
| 105 | |
| 106 | /* if we are already at full speed then break out early */ |
Rafael J. Wysocki | d352cf4 | 2016-06-13 23:33:49 +0200 | [diff] [blame] | 107 | if (requested_freq == policy->max) |
Rafael J. Wysocki | 4cccf75 | 2016-02-15 02:19:31 +0100 | [diff] [blame] | 108 | goto out; |
Viresh Kumar | 4471a34 | 2012-10-26 00:47:42 +0200 | [diff] [blame] | 109 | |
Stratos Karafotis | 00bfe05 | 2016-11-16 19:26:29 +0200 | [diff] [blame] | 110 | requested_freq += freq_step; |
Rafael J. Wysocki | abb6627 | 2016-10-12 21:47:03 +0200 | [diff] [blame] | 111 | if (requested_freq > policy->max) |
| 112 | requested_freq = policy->max; |
Viresh Kumar | 4471a34 | 2012-10-26 00:47:42 +0200 | [diff] [blame] | 113 | |
Vincent Donnefort | b894d20 | 2021-09-08 15:05:29 +0100 | [diff] [blame] | 114 | __cpufreq_driver_target(policy, requested_freq, |
| 115 | CPUFREQ_RELATION_HE); |
Rafael J. Wysocki | abb6627 | 2016-10-12 21:47:03 +0200 | [diff] [blame] | 116 | dbs_info->requested_freq = requested_freq; |
Rafael J. Wysocki | 4cccf75 | 2016-02-15 02:19:31 +0100 | [diff] [blame] | 117 | goto out; |
Viresh Kumar | 4471a34 | 2012-10-26 00:47:42 +0200 | [diff] [blame] | 118 | } |
| 119 | |
Stratos Karafotis | 7af1c05 | 2013-03-05 22:06:29 +0000 | [diff] [blame] | 120 | /* if sampling_down_factor is active break out early */ |
Viresh Kumar | ff4b178 | 2016-02-09 09:01:32 +0530 | [diff] [blame] | 121 | if (++dbs_info->down_skip < dbs_data->sampling_down_factor) |
Rafael J. Wysocki | 4cccf75 | 2016-02-15 02:19:31 +0100 | [diff] [blame] | 122 | goto out; |
Stratos Karafotis | 7af1c05 | 2013-03-05 22:06:29 +0000 | [diff] [blame] | 123 | dbs_info->down_skip = 0; |
| 124 | |
Stratos Karafotis | 27ed3cd | 2013-03-05 22:06:40 +0000 | [diff] [blame] | 125 | /* Check for frequency decrease */ |
| 126 | if (load < cs_tuners->down_threshold) { |
Viresh Kumar | 4471a34 | 2012-10-26 00:47:42 +0200 | [diff] [blame] | 127 | /* |
| 128 | * if we cannot reduce the frequency anymore, break out early |
| 129 | */ |
Rafael J. Wysocki | d352cf4 | 2016-06-13 23:33:49 +0200 | [diff] [blame] | 130 | if (requested_freq == policy->min) |
Rafael J. Wysocki | 4cccf75 | 2016-02-15 02:19:31 +0100 | [diff] [blame] | 131 | goto out; |
Viresh Kumar | 4471a34 | 2012-10-26 00:47:42 +0200 | [diff] [blame] | 132 | |
Viresh Kumar | d5f905a | 2016-11-14 12:30:43 +0530 | [diff] [blame] | 133 | if (requested_freq > freq_step) |
| 134 | requested_freq -= freq_step; |
Xiaoguang Chen | 3baa976 | 2013-11-07 10:28:50 +0800 | [diff] [blame] | 135 | else |
Rafael J. Wysocki | d352cf4 | 2016-06-13 23:33:49 +0200 | [diff] [blame] | 136 | requested_freq = policy->min; |
Namhyung Kim | ad529a9 | 2013-02-28 05:38:01 +0000 | [diff] [blame] | 137 | |
Vincent Donnefort | b894d20 | 2021-09-08 15:05:29 +0100 | [diff] [blame] | 138 | __cpufreq_driver_target(policy, requested_freq, |
| 139 | CPUFREQ_RELATION_LE); |
Rafael J. Wysocki | abb6627 | 2016-10-12 21:47:03 +0200 | [diff] [blame] | 140 | dbs_info->requested_freq = requested_freq; |
Viresh Kumar | 4471a34 | 2012-10-26 00:47:42 +0200 | [diff] [blame] | 141 | } |
Viresh Kumar | 4471a34 | 2012-10-26 00:47:42 +0200 | [diff] [blame] | 142 | |
Rafael J. Wysocki | 4cccf75 | 2016-02-15 02:19:31 +0100 | [diff] [blame] | 143 | out: |
Rafael J. Wysocki | 07aa440 | 2016-02-15 02:22:13 +0100 | [diff] [blame] | 144 | return dbs_data->sampling_rate; |
Fabio Baltieri | 66df2a01 | 2012-12-27 14:55:41 +0000 | [diff] [blame] | 145 | } |
Viresh Kumar | 4447266 | 2013-01-31 17:28:02 +0000 | [diff] [blame] | 146 | |
Dave Jones | b917083 | 2005-05-31 19:03:47 -0700 | [diff] [blame] | 147 | /************************** sysfs interface ************************/ |
Dave Jones | b917083 | 2005-05-31 19:03:47 -0700 | [diff] [blame] | 148 | |
Rafael J. Wysocki | 0dd3c1d | 2016-03-22 02:47:51 +0100 | [diff] [blame] | 149 | static ssize_t store_sampling_down_factor(struct gov_attr_set *attr_set, |
| 150 | const char *buf, size_t count) |
Dave Jones | b917083 | 2005-05-31 19:03:47 -0700 | [diff] [blame] | 151 | { |
Rafael J. Wysocki | 0dd3c1d | 2016-03-22 02:47:51 +0100 | [diff] [blame] | 152 | struct dbs_data *dbs_data = to_dbs_data(attr_set); |
Dave Jones | b917083 | 2005-05-31 19:03:47 -0700 | [diff] [blame] | 153 | unsigned int input; |
| 154 | int ret; |
Dave Jones | 9acef48 | 2009-01-18 01:39:51 -0500 | [diff] [blame] | 155 | ret = sscanf(buf, "%u", &input); |
Alexander Clouter | 8e677ce | 2009-02-13 19:02:34 +0000 | [diff] [blame] | 156 | |
Alexander Clouter | 2c906b3 | 2006-03-22 09:54:10 +0000 | [diff] [blame] | 157 | if (ret != 1 || input > MAX_SAMPLING_DOWN_FACTOR || input < 1) |
Dave Jones | b917083 | 2005-05-31 19:03:47 -0700 | [diff] [blame] | 158 | return -EINVAL; |
| 159 | |
Viresh Kumar | ff4b178 | 2016-02-09 09:01:32 +0530 | [diff] [blame] | 160 | dbs_data->sampling_down_factor = input; |
Dave Jones | b917083 | 2005-05-31 19:03:47 -0700 | [diff] [blame] | 161 | return count; |
| 162 | } |
| 163 | |
Rafael J. Wysocki | 0dd3c1d | 2016-03-22 02:47:51 +0100 | [diff] [blame] | 164 | static ssize_t store_up_threshold(struct gov_attr_set *attr_set, |
| 165 | const char *buf, size_t count) |
Dave Jones | b917083 | 2005-05-31 19:03:47 -0700 | [diff] [blame] | 166 | { |
Rafael J. Wysocki | 0dd3c1d | 2016-03-22 02:47:51 +0100 | [diff] [blame] | 167 | struct dbs_data *dbs_data = to_dbs_data(attr_set); |
Viresh Kumar | 4d5dcc4 | 2013-03-27 15:58:58 +0000 | [diff] [blame] | 168 | struct cs_dbs_tuners *cs_tuners = dbs_data->tuners; |
Dave Jones | b917083 | 2005-05-31 19:03:47 -0700 | [diff] [blame] | 169 | unsigned int input; |
| 170 | int ret; |
Dave Jones | 9acef48 | 2009-01-18 01:39:51 -0500 | [diff] [blame] | 171 | ret = sscanf(buf, "%u", &input); |
Dave Jones | b917083 | 2005-05-31 19:03:47 -0700 | [diff] [blame] | 172 | |
Viresh Kumar | 4d5dcc4 | 2013-03-27 15:58:58 +0000 | [diff] [blame] | 173 | if (ret != 1 || input > 100 || input <= cs_tuners->down_threshold) |
Dave Jones | b917083 | 2005-05-31 19:03:47 -0700 | [diff] [blame] | 174 | return -EINVAL; |
Dave Jones | b917083 | 2005-05-31 19:03:47 -0700 | [diff] [blame] | 175 | |
Viresh Kumar | ff4b178 | 2016-02-09 09:01:32 +0530 | [diff] [blame] | 176 | dbs_data->up_threshold = input; |
Dave Jones | b917083 | 2005-05-31 19:03:47 -0700 | [diff] [blame] | 177 | return count; |
| 178 | } |
| 179 | |
Rafael J. Wysocki | 0dd3c1d | 2016-03-22 02:47:51 +0100 | [diff] [blame] | 180 | static ssize_t store_down_threshold(struct gov_attr_set *attr_set, |
| 181 | const char *buf, size_t count) |
Dave Jones | b917083 | 2005-05-31 19:03:47 -0700 | [diff] [blame] | 182 | { |
Rafael J. Wysocki | 0dd3c1d | 2016-03-22 02:47:51 +0100 | [diff] [blame] | 183 | struct dbs_data *dbs_data = to_dbs_data(attr_set); |
Viresh Kumar | 4d5dcc4 | 2013-03-27 15:58:58 +0000 | [diff] [blame] | 184 | struct cs_dbs_tuners *cs_tuners = dbs_data->tuners; |
Dave Jones | b917083 | 2005-05-31 19:03:47 -0700 | [diff] [blame] | 185 | unsigned int input; |
| 186 | int ret; |
Dave Jones | 9acef48 | 2009-01-18 01:39:51 -0500 | [diff] [blame] | 187 | ret = sscanf(buf, "%u", &input); |
Dave Jones | b917083 | 2005-05-31 19:03:47 -0700 | [diff] [blame] | 188 | |
Tomasz Wilczyński | b8e11f7 | 2017-06-11 17:28:39 +0900 | [diff] [blame] | 189 | /* cannot be lower than 1 otherwise freq will not fall */ |
| 190 | if (ret != 1 || input < 1 || input > 100 || |
Viresh Kumar | ff4b178 | 2016-02-09 09:01:32 +0530 | [diff] [blame] | 191 | input >= dbs_data->up_threshold) |
Dave Jones | b917083 | 2005-05-31 19:03:47 -0700 | [diff] [blame] | 192 | return -EINVAL; |
Dave Jones | b917083 | 2005-05-31 19:03:47 -0700 | [diff] [blame] | 193 | |
Viresh Kumar | 4d5dcc4 | 2013-03-27 15:58:58 +0000 | [diff] [blame] | 194 | cs_tuners->down_threshold = input; |
Dave Jones | b917083 | 2005-05-31 19:03:47 -0700 | [diff] [blame] | 195 | return count; |
| 196 | } |
| 197 | |
Rafael J. Wysocki | 0dd3c1d | 2016-03-22 02:47:51 +0100 | [diff] [blame] | 198 | static ssize_t store_ignore_nice_load(struct gov_attr_set *attr_set, |
| 199 | const char *buf, size_t count) |
Dave Jones | b917083 | 2005-05-31 19:03:47 -0700 | [diff] [blame] | 200 | { |
Rafael J. Wysocki | 0dd3c1d | 2016-03-22 02:47:51 +0100 | [diff] [blame] | 201 | struct dbs_data *dbs_data = to_dbs_data(attr_set); |
Rafael J. Wysocki | a33cce1 | 2016-02-18 02:26:55 +0100 | [diff] [blame] | 202 | unsigned int input; |
Dave Jones | b917083 | 2005-05-31 19:03:47 -0700 | [diff] [blame] | 203 | int ret; |
| 204 | |
Dave Jones | 18a7247 | 2007-10-22 16:49:09 -0400 | [diff] [blame] | 205 | ret = sscanf(buf, "%u", &input); |
| 206 | if (ret != 1) |
Dave Jones | b917083 | 2005-05-31 19:03:47 -0700 | [diff] [blame] | 207 | return -EINVAL; |
| 208 | |
Dave Jones | 18a7247 | 2007-10-22 16:49:09 -0400 | [diff] [blame] | 209 | if (input > 1) |
Dave Jones | b917083 | 2005-05-31 19:03:47 -0700 | [diff] [blame] | 210 | input = 1; |
Dave Jones | 18a7247 | 2007-10-22 16:49:09 -0400 | [diff] [blame] | 211 | |
Viresh Kumar | ff4b178 | 2016-02-09 09:01:32 +0530 | [diff] [blame] | 212 | if (input == dbs_data->ignore_nice_load) /* nothing to do */ |
Dave Jones | b917083 | 2005-05-31 19:03:47 -0700 | [diff] [blame] | 213 | return count; |
Thomas Renninger | 326c86d | 2011-03-03 21:31:27 +0100 | [diff] [blame] | 214 | |
Viresh Kumar | ff4b178 | 2016-02-09 09:01:32 +0530 | [diff] [blame] | 215 | dbs_data->ignore_nice_load = input; |
Dave Jones | b917083 | 2005-05-31 19:03:47 -0700 | [diff] [blame] | 216 | |
Alexander Clouter | 8e677ce | 2009-02-13 19:02:34 +0000 | [diff] [blame] | 217 | /* we need to re-evaluate prev_cpu_idle */ |
Rafael J. Wysocki | 8c8f77f | 2016-02-21 00:51:27 +0100 | [diff] [blame] | 218 | gov_update_cpu_data(dbs_data); |
Rafael J. Wysocki | a33cce1 | 2016-02-18 02:26:55 +0100 | [diff] [blame] | 219 | |
Dave Jones | b917083 | 2005-05-31 19:03:47 -0700 | [diff] [blame] | 220 | return count; |
| 221 | } |
| 222 | |
Rafael J. Wysocki | 0dd3c1d | 2016-03-22 02:47:51 +0100 | [diff] [blame] | 223 | static ssize_t store_freq_step(struct gov_attr_set *attr_set, const char *buf, |
| 224 | size_t count) |
Dave Jones | b917083 | 2005-05-31 19:03:47 -0700 | [diff] [blame] | 225 | { |
Rafael J. Wysocki | 0dd3c1d | 2016-03-22 02:47:51 +0100 | [diff] [blame] | 226 | struct dbs_data *dbs_data = to_dbs_data(attr_set); |
Viresh Kumar | 4d5dcc4 | 2013-03-27 15:58:58 +0000 | [diff] [blame] | 227 | struct cs_dbs_tuners *cs_tuners = dbs_data->tuners; |
Dave Jones | b917083 | 2005-05-31 19:03:47 -0700 | [diff] [blame] | 228 | unsigned int input; |
| 229 | int ret; |
Dave Jones | 18a7247 | 2007-10-22 16:49:09 -0400 | [diff] [blame] | 230 | ret = sscanf(buf, "%u", &input); |
Dave Jones | b917083 | 2005-05-31 19:03:47 -0700 | [diff] [blame] | 231 | |
Dave Jones | 18a7247 | 2007-10-22 16:49:09 -0400 | [diff] [blame] | 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 > 100) |
Dave Jones | b917083 | 2005-05-31 19:03:47 -0700 | [diff] [blame] | 236 | input = 100; |
Dave Jones | 18a7247 | 2007-10-22 16:49:09 -0400 | [diff] [blame] | 237 | |
Viresh Kumar | 4471a34 | 2012-10-26 00:47:42 +0200 | [diff] [blame] | 238 | /* |
| 239 | * no need to test here if freq_step is zero as the user might actually |
| 240 | * want this, they would be crazy though :) |
| 241 | */ |
Viresh Kumar | 4d5dcc4 | 2013-03-27 15:58:58 +0000 | [diff] [blame] | 242 | cs_tuners->freq_step = input; |
Dave Jones | b917083 | 2005-05-31 19:03:47 -0700 | [diff] [blame] | 243 | return count; |
| 244 | } |
| 245 | |
Viresh Kumar | c443563 | 2016-02-09 09:01:33 +0530 | [diff] [blame] | 246 | gov_show_one_common(sampling_rate); |
| 247 | gov_show_one_common(sampling_down_factor); |
| 248 | gov_show_one_common(up_threshold); |
| 249 | gov_show_one_common(ignore_nice_load); |
Viresh Kumar | c443563 | 2016-02-09 09:01:33 +0530 | [diff] [blame] | 250 | gov_show_one(cs, down_threshold); |
| 251 | gov_show_one(cs, freq_step); |
Viresh Kumar | 4471a34 | 2012-10-26 00:47:42 +0200 | [diff] [blame] | 252 | |
Viresh Kumar | c443563 | 2016-02-09 09:01:33 +0530 | [diff] [blame] | 253 | gov_attr_rw(sampling_rate); |
| 254 | gov_attr_rw(sampling_down_factor); |
| 255 | gov_attr_rw(up_threshold); |
| 256 | gov_attr_rw(ignore_nice_load); |
Viresh Kumar | c443563 | 2016-02-09 09:01:33 +0530 | [diff] [blame] | 257 | gov_attr_rw(down_threshold); |
| 258 | gov_attr_rw(freq_step); |
Dave Jones | b917083 | 2005-05-31 19:03:47 -0700 | [diff] [blame] | 259 | |
Greg Kroah-Hartman | fe262d5 | 2021-12-28 14:19:12 +0100 | [diff] [blame] | 260 | static struct attribute *cs_attrs[] = { |
Viresh Kumar | c443563 | 2016-02-09 09:01:33 +0530 | [diff] [blame] | 261 | &sampling_rate.attr, |
| 262 | &sampling_down_factor.attr, |
| 263 | &up_threshold.attr, |
| 264 | &down_threshold.attr, |
| 265 | &ignore_nice_load.attr, |
| 266 | &freq_step.attr, |
Dave Jones | b917083 | 2005-05-31 19:03:47 -0700 | [diff] [blame] | 267 | NULL |
| 268 | }; |
Greg Kroah-Hartman | fe262d5 | 2021-12-28 14:19:12 +0100 | [diff] [blame] | 269 | ATTRIBUTE_GROUPS(cs); |
Dave Jones | b917083 | 2005-05-31 19:03:47 -0700 | [diff] [blame] | 270 | |
Dave Jones | b917083 | 2005-05-31 19:03:47 -0700 | [diff] [blame] | 271 | /************************** sysfs end ************************/ |
| 272 | |
Rafael J. Wysocki | 7d5a995 | 2016-02-18 18:40:14 +0100 | [diff] [blame] | 273 | static struct policy_dbs_info *cs_alloc(void) |
| 274 | { |
| 275 | struct cs_policy_dbs_info *dbs_info; |
| 276 | |
| 277 | dbs_info = kzalloc(sizeof(*dbs_info), GFP_KERNEL); |
| 278 | return dbs_info ? &dbs_info->policy_dbs : NULL; |
| 279 | } |
| 280 | |
| 281 | static void cs_free(struct policy_dbs_info *policy_dbs) |
| 282 | { |
| 283 | kfree(to_dbs_info(policy_dbs)); |
| 284 | } |
| 285 | |
Rafael J. Wysocki | 9a15fb2 | 2016-05-18 22:59:49 +0200 | [diff] [blame] | 286 | static int cs_init(struct dbs_data *dbs_data) |
Viresh Kumar | 4d5dcc4 | 2013-03-27 15:58:58 +0000 | [diff] [blame] | 287 | { |
| 288 | struct cs_dbs_tuners *tuners; |
| 289 | |
Viresh Kumar | d5b73cd | 2013-08-06 22:53:06 +0530 | [diff] [blame] | 290 | tuners = kzalloc(sizeof(*tuners), GFP_KERNEL); |
Viresh Kumar | a69d6b2 | 2016-05-18 17:55:26 +0530 | [diff] [blame] | 291 | if (!tuners) |
Viresh Kumar | 4d5dcc4 | 2013-03-27 15:58:58 +0000 | [diff] [blame] | 292 | return -ENOMEM; |
Viresh Kumar | 4d5dcc4 | 2013-03-27 15:58:58 +0000 | [diff] [blame] | 293 | |
Viresh Kumar | 4d5dcc4 | 2013-03-27 15:58:58 +0000 | [diff] [blame] | 294 | tuners->down_threshold = DEF_FREQUENCY_DOWN_THRESHOLD; |
Stratos Karafotis | 9876584 | 2013-03-22 08:03:17 +0000 | [diff] [blame] | 295 | tuners->freq_step = DEF_FREQUENCY_STEP; |
Viresh Kumar | ff4b178 | 2016-02-09 09:01:32 +0530 | [diff] [blame] | 296 | dbs_data->up_threshold = DEF_FREQUENCY_UP_THRESHOLD; |
| 297 | dbs_data->sampling_down_factor = DEF_SAMPLING_DOWN_FACTOR; |
| 298 | dbs_data->ignore_nice_load = 0; |
Viresh Kumar | 4d5dcc4 | 2013-03-27 15:58:58 +0000 | [diff] [blame] | 299 | dbs_data->tuners = tuners; |
Viresh Kumar | 8e0484d | 2015-06-03 15:57:11 +0530 | [diff] [blame] | 300 | |
Viresh Kumar | 4d5dcc4 | 2013-03-27 15:58:58 +0000 | [diff] [blame] | 301 | return 0; |
| 302 | } |
| 303 | |
Rafael J. Wysocki | 9a15fb2 | 2016-05-18 22:59:49 +0200 | [diff] [blame] | 304 | static void cs_exit(struct dbs_data *dbs_data) |
Viresh Kumar | 4d5dcc4 | 2013-03-27 15:58:58 +0000 | [diff] [blame] | 305 | { |
| 306 | kfree(dbs_data->tuners); |
| 307 | } |
| 308 | |
Rafael J. Wysocki | 702c9e5 | 2016-02-18 02:21:21 +0100 | [diff] [blame] | 309 | static void cs_start(struct cpufreq_policy *policy) |
| 310 | { |
Rafael J. Wysocki | 7d5a995 | 2016-02-18 18:40:14 +0100 | [diff] [blame] | 311 | struct cs_policy_dbs_info *dbs_info = to_dbs_info(policy->governor_data); |
Rafael J. Wysocki | 702c9e5 | 2016-02-18 02:21:21 +0100 | [diff] [blame] | 312 | |
| 313 | dbs_info->down_skip = 0; |
Rafael J. Wysocki | abb6627 | 2016-10-12 21:47:03 +0200 | [diff] [blame] | 314 | dbs_info->requested_freq = policy->cur; |
Rafael J. Wysocki | 702c9e5 | 2016-02-18 02:21:21 +0100 | [diff] [blame] | 315 | } |
| 316 | |
Rafael J. Wysocki | d352cf4 | 2016-06-13 23:33:49 +0200 | [diff] [blame] | 317 | static struct dbs_governor cs_governor = { |
| 318 | .gov = CPUFREQ_DBS_GOVERNOR_INITIALIZER("conservative"), |
Greg Kroah-Hartman | fe262d5 | 2021-12-28 14:19:12 +0100 | [diff] [blame] | 319 | .kobj_type = { .default_groups = cs_groups }, |
Viresh Kumar | 26f0dbc | 2016-11-08 11:06:33 +0530 | [diff] [blame] | 320 | .gov_dbs_update = cs_dbs_update, |
Rafael J. Wysocki | d352cf4 | 2016-06-13 23:33:49 +0200 | [diff] [blame] | 321 | .alloc = cs_alloc, |
| 322 | .free = cs_free, |
| 323 | .init = cs_init, |
| 324 | .exit = cs_exit, |
| 325 | .start = cs_start, |
Viresh Kumar | 4471a34 | 2012-10-26 00:47:42 +0200 | [diff] [blame] | 326 | }; |
Dave Jones | b917083 | 2005-05-31 19:03:47 -0700 | [diff] [blame] | 327 | |
Quentin Perret | 10dd857 | 2020-06-29 13:54:59 +0530 | [diff] [blame] | 328 | #define CPU_FREQ_GOV_CONSERVATIVE (cs_governor.gov) |
Dave Jones | b917083 | 2005-05-31 19:03:47 -0700 | [diff] [blame] | 329 | |
Alexander Clouter | 11a80a9c76 | 2009-02-13 19:01:01 +0000 | [diff] [blame] | 330 | MODULE_AUTHOR("Alexander Clouter <alex@digriz.org.uk>"); |
Dave Jones | 9acef48 | 2009-01-18 01:39:51 -0500 | [diff] [blame] | 331 | MODULE_DESCRIPTION("'cpufreq_conservative' - A dynamic cpufreq governor for " |
Dave Jones | b917083 | 2005-05-31 19:03:47 -0700 | [diff] [blame] | 332 | "Low Latency Frequency Transition capable processors " |
| 333 | "optimised for use in a battery environment"); |
Dave Jones | 9acef48 | 2009-01-18 01:39:51 -0500 | [diff] [blame] | 334 | MODULE_LICENSE("GPL"); |
Dave Jones | b917083 | 2005-05-31 19:03:47 -0700 | [diff] [blame] | 335 | |
Johannes Weiner | 6915719 | 2008-01-17 15:21:08 -0800 | [diff] [blame] | 336 | #ifdef CONFIG_CPU_FREQ_DEFAULT_GOV_CONSERVATIVE |
Rafael J. Wysocki | de1df26 | 2016-02-05 02:37:42 +0100 | [diff] [blame] | 337 | struct cpufreq_governor *cpufreq_default_governor(void) |
| 338 | { |
Quentin Perret | 10dd857 | 2020-06-29 13:54:59 +0530 | [diff] [blame] | 339 | return &CPU_FREQ_GOV_CONSERVATIVE; |
Rafael J. Wysocki | de1df26 | 2016-02-05 02:37:42 +0100 | [diff] [blame] | 340 | } |
Johannes Weiner | 6915719 | 2008-01-17 15:21:08 -0800 | [diff] [blame] | 341 | #endif |
Quentin Perret | 10dd857 | 2020-06-29 13:54:59 +0530 | [diff] [blame] | 342 | |
| 343 | cpufreq_governor_init(CPU_FREQ_GOV_CONSERVATIVE); |
| 344 | cpufreq_governor_exit(CPU_FREQ_GOV_CONSERVATIVE); |