^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1) // SPDX-License-Identifier: GPL-2.0-only
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3) * drivers/cpufreq/cpufreq_conservative.c
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5) * Copyright (C) 2001 Russell King
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6) * (C) 2003 Venkatesh Pallipadi <venkatesh.pallipadi@intel.com>.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7) * Jun Nakajima <jun.nakajima@intel.com>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8) * (C) 2009 Alexander Clouter <alex@digriz.org.uk>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) #include <linux/slab.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) #include "cpufreq_governor.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) struct cs_policy_dbs_info {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) struct policy_dbs_info policy_dbs;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) unsigned int down_skip;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) unsigned int requested_freq;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) static inline struct cs_policy_dbs_info *to_dbs_info(struct policy_dbs_info *policy_dbs)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) return container_of(policy_dbs, struct cs_policy_dbs_info, policy_dbs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) struct cs_dbs_tuners {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) unsigned int down_threshold;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) unsigned int freq_step;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) /* Conservative governor macros */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) #define DEF_FREQUENCY_UP_THRESHOLD (80)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) #define DEF_FREQUENCY_DOWN_THRESHOLD (20)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) #define DEF_FREQUENCY_STEP (5)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) #define DEF_SAMPLING_DOWN_FACTOR (1)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) #define MAX_SAMPLING_DOWN_FACTOR (10)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) static inline unsigned int get_freq_step(struct cs_dbs_tuners *cs_tuners,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) struct cpufreq_policy *policy)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) unsigned int freq_step = (cs_tuners->freq_step * policy->max) / 100;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) /* max freq cannot be less than 100. But who knows... */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) if (unlikely(freq_step == 0))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) freq_step = DEF_FREQUENCY_STEP;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) return freq_step;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) * Every sampling_rate, we check, if current idle time is less than 20%
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) * (default), then we try to increase frequency. Every sampling_rate *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) * sampling_down_factor, we check, if current idle time is more than 80%
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) * (default), then we try to decrease frequency
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) * Frequency updates happen at minimum steps of 5% (default) of maximum
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) * frequency
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) static unsigned int cs_dbs_update(struct cpufreq_policy *policy)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) struct policy_dbs_info *policy_dbs = policy->governor_data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) struct cs_policy_dbs_info *dbs_info = to_dbs_info(policy_dbs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) unsigned int requested_freq = dbs_info->requested_freq;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) struct dbs_data *dbs_data = policy_dbs->dbs_data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) struct cs_dbs_tuners *cs_tuners = dbs_data->tuners;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) unsigned int load = dbs_update(policy);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) unsigned int freq_step;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) * break out if we 'cannot' reduce the speed as the user might
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) * want freq_step to be zero
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) if (cs_tuners->freq_step == 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) * If requested_freq is out of range, it is likely that the limits
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77) * changed in the meantime, so fall back to current frequency in that
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78) * case.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80) if (requested_freq > policy->max || requested_freq < policy->min) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81) requested_freq = policy->cur;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82) dbs_info->requested_freq = requested_freq;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85) freq_step = get_freq_step(cs_tuners, policy);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88) * Decrease requested_freq one freq_step for each idle period that
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89) * we didn't update the frequency.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91) if (policy_dbs->idle_periods < UINT_MAX) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92) unsigned int freq_steps = policy_dbs->idle_periods * freq_step;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94) if (requested_freq > policy->min + freq_steps)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95) requested_freq -= freq_steps;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97) requested_freq = policy->min;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99) policy_dbs->idle_periods = UINT_MAX;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) /* Check for frequency increase */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) if (load > dbs_data->up_threshold) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) dbs_info->down_skip = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) /* if we are already at full speed then break out early */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) if (requested_freq == policy->max)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) requested_freq += freq_step;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) if (requested_freq > policy->max)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) requested_freq = policy->max;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) __cpufreq_driver_target(policy, requested_freq, CPUFREQ_RELATION_H);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) dbs_info->requested_freq = requested_freq;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) /* if sampling_down_factor is active break out early */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) if (++dbs_info->down_skip < dbs_data->sampling_down_factor)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) dbs_info->down_skip = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) /* Check for frequency decrease */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) if (load < cs_tuners->down_threshold) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) * if we cannot reduce the frequency anymore, break out early
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) if (requested_freq == policy->min)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) if (requested_freq > freq_step)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) requested_freq -= freq_step;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) requested_freq = policy->min;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) __cpufreq_driver_target(policy, requested_freq, CPUFREQ_RELATION_L);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) dbs_info->requested_freq = requested_freq;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) return dbs_data->sampling_rate;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) /************************** sysfs interface ************************/
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) static ssize_t store_sampling_down_factor(struct gov_attr_set *attr_set,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) const char *buf, size_t count)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) struct dbs_data *dbs_data = to_dbs_data(attr_set);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) unsigned int input;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) ret = sscanf(buf, "%u", &input);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) if (ret != 1 || input > MAX_SAMPLING_DOWN_FACTOR || input < 1)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) dbs_data->sampling_down_factor = input;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) return count;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) static ssize_t store_up_threshold(struct gov_attr_set *attr_set,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) const char *buf, size_t count)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) struct dbs_data *dbs_data = to_dbs_data(attr_set);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) struct cs_dbs_tuners *cs_tuners = dbs_data->tuners;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) unsigned int input;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) ret = sscanf(buf, "%u", &input);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) if (ret != 1 || input > 100 || input <= cs_tuners->down_threshold)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) dbs_data->up_threshold = input;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) return count;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) static ssize_t store_down_threshold(struct gov_attr_set *attr_set,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) const char *buf, size_t count)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) struct dbs_data *dbs_data = to_dbs_data(attr_set);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) struct cs_dbs_tuners *cs_tuners = dbs_data->tuners;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) unsigned int input;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) ret = sscanf(buf, "%u", &input);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) /* cannot be lower than 1 otherwise freq will not fall */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) if (ret != 1 || input < 1 || input > 100 ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) input >= dbs_data->up_threshold)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) cs_tuners->down_threshold = input;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) return count;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) static ssize_t store_ignore_nice_load(struct gov_attr_set *attr_set,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) const char *buf, size_t count)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) struct dbs_data *dbs_data = to_dbs_data(attr_set);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) unsigned int input;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) ret = sscanf(buf, "%u", &input);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) if (ret != 1)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) if (input > 1)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208) input = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) if (input == dbs_data->ignore_nice_load) /* nothing to do */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211) return count;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213) dbs_data->ignore_nice_load = input;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215) /* we need to re-evaluate prev_cpu_idle */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216) gov_update_cpu_data(dbs_data);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218) return count;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221) static ssize_t store_freq_step(struct gov_attr_set *attr_set, const char *buf,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222) size_t count)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224) struct dbs_data *dbs_data = to_dbs_data(attr_set);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225) struct cs_dbs_tuners *cs_tuners = dbs_data->tuners;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226) unsigned int input;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227) int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228) ret = sscanf(buf, "%u", &input);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230) if (ret != 1)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233) if (input > 100)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234) input = 100;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237) * no need to test here if freq_step is zero as the user might actually
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238) * want this, they would be crazy though :)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240) cs_tuners->freq_step = input;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241) return count;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244) gov_show_one_common(sampling_rate);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245) gov_show_one_common(sampling_down_factor);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246) gov_show_one_common(up_threshold);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247) gov_show_one_common(ignore_nice_load);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248) gov_show_one(cs, down_threshold);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249) gov_show_one(cs, freq_step);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251) gov_attr_rw(sampling_rate);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252) gov_attr_rw(sampling_down_factor);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253) gov_attr_rw(up_threshold);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254) gov_attr_rw(ignore_nice_load);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255) gov_attr_rw(down_threshold);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256) gov_attr_rw(freq_step);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 257)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 258) static struct attribute *cs_attributes[] = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 259) &sampling_rate.attr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 260) &sampling_down_factor.attr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 261) &up_threshold.attr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 262) &down_threshold.attr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 263) &ignore_nice_load.attr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 264) &freq_step.attr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 265) NULL
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 266) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 267)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 268) /************************** sysfs end ************************/
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 269)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 270) static struct policy_dbs_info *cs_alloc(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 271) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 272) struct cs_policy_dbs_info *dbs_info;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 273)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 274) dbs_info = kzalloc(sizeof(*dbs_info), GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 275) return dbs_info ? &dbs_info->policy_dbs : NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 276) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 277)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 278) static void cs_free(struct policy_dbs_info *policy_dbs)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 279) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 280) kfree(to_dbs_info(policy_dbs));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 281) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 282)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 283) static int cs_init(struct dbs_data *dbs_data)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 284) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 285) struct cs_dbs_tuners *tuners;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 286)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 287) tuners = kzalloc(sizeof(*tuners), GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 288) if (!tuners)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 289) return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 290)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 291) tuners->down_threshold = DEF_FREQUENCY_DOWN_THRESHOLD;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 292) tuners->freq_step = DEF_FREQUENCY_STEP;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 293) dbs_data->up_threshold = DEF_FREQUENCY_UP_THRESHOLD;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 294) dbs_data->sampling_down_factor = DEF_SAMPLING_DOWN_FACTOR;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 295) dbs_data->ignore_nice_load = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 296) dbs_data->tuners = tuners;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 297)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 298) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 299) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 300)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 301) static void cs_exit(struct dbs_data *dbs_data)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 302) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 303) kfree(dbs_data->tuners);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 304) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 305)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 306) static void cs_start(struct cpufreq_policy *policy)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 307) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 308) struct cs_policy_dbs_info *dbs_info = to_dbs_info(policy->governor_data);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 309)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 310) dbs_info->down_skip = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 311) dbs_info->requested_freq = policy->cur;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 312) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 313)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 314) static struct dbs_governor cs_governor = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 315) .gov = CPUFREQ_DBS_GOVERNOR_INITIALIZER("conservative"),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 316) .kobj_type = { .default_attrs = cs_attributes },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 317) .gov_dbs_update = cs_dbs_update,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 318) .alloc = cs_alloc,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 319) .free = cs_free,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 320) .init = cs_init,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 321) .exit = cs_exit,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 322) .start = cs_start,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 323) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 324)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 325) #define CPU_FREQ_GOV_CONSERVATIVE (cs_governor.gov)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 326)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 327) MODULE_AUTHOR("Alexander Clouter <alex@digriz.org.uk>");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 328) MODULE_DESCRIPTION("'cpufreq_conservative' - A dynamic cpufreq governor for "
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 329) "Low Latency Frequency Transition capable processors "
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 330) "optimised for use in a battery environment");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 331) MODULE_LICENSE("GPL");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 332)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 333) #ifdef CONFIG_CPU_FREQ_DEFAULT_GOV_CONSERVATIVE
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 334) struct cpufreq_governor *cpufreq_default_governor(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 335) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 336) return &CPU_FREQ_GOV_CONSERVATIVE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 337) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 338) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 339)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 340) cpufreq_governor_init(CPU_FREQ_GOV_CONSERVATIVE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 341) cpufreq_governor_exit(CPU_FREQ_GOV_CONSERVATIVE);
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
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