2019-06-04 08:11:33 +00:00
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// SPDX-License-Identifier: GPL-2.0-only
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2005-06-01 02:03:47 +00:00
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/*
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* drivers/cpufreq/cpufreq_conservative.c
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*
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* Copyright (C) 2001 Russell King
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* (C) 2003 Venkatesh Pallipadi <venkatesh.pallipadi@intel.com>.
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* Jun Nakajima <jun.nakajima@intel.com>
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2009-02-13 19:01:01 +00:00
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* (C) 2009 Alexander Clouter <alex@digriz.org.uk>
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2005-06-01 02:03:47 +00:00
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*/
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2013-03-27 15:58:58 +00:00
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#include <linux/slab.h>
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2012-10-25 22:47:42 +00:00
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#include "cpufreq_governor.h"
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2005-06-01 02:03:47 +00:00
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2016-02-18 17:40:14 +00:00
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struct cs_policy_dbs_info {
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struct policy_dbs_info policy_dbs;
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unsigned int down_skip;
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2016-10-12 19:47:03 +00:00
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unsigned int requested_freq;
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2016-02-18 17:40:14 +00:00
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};
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static inline struct cs_policy_dbs_info *to_dbs_info(struct policy_dbs_info *policy_dbs)
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{
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return container_of(policy_dbs, struct cs_policy_dbs_info, policy_dbs);
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}
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2016-02-18 17:41:36 +00:00
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struct cs_dbs_tuners {
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unsigned int down_threshold;
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unsigned int freq_step;
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};
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2013-02-08 17:24:24 +00:00
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/* Conservative governor macros */
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2005-06-01 02:03:47 +00:00
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#define DEF_FREQUENCY_UP_THRESHOLD (80)
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#define DEF_FREQUENCY_DOWN_THRESHOLD (20)
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2013-03-22 08:03:17 +00:00
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#define DEF_FREQUENCY_STEP (5)
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2006-03-22 09:54:10 +00:00
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#define DEF_SAMPLING_DOWN_FACTOR (1)
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#define MAX_SAMPLING_DOWN_FACTOR (10)
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2005-06-01 02:03:47 +00:00
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2016-11-14 07:00:43 +00:00
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static inline unsigned int get_freq_step(struct cs_dbs_tuners *cs_tuners,
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struct cpufreq_policy *policy)
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2013-03-22 08:03:17 +00:00
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{
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2016-11-14 07:00:43 +00:00
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unsigned int freq_step = (cs_tuners->freq_step * policy->max) / 100;
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2013-03-22 08:03:17 +00:00
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/* max freq cannot be less than 100. But who knows... */
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2016-11-14 07:00:43 +00:00
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if (unlikely(freq_step == 0))
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freq_step = DEF_FREQUENCY_STEP;
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2013-03-22 08:03:17 +00:00
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2016-11-14 07:00:43 +00:00
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return freq_step;
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2013-03-22 08:03:17 +00:00
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}
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2012-10-25 22:47:42 +00:00
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/*
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* Every sampling_rate, we check, if current idle time is less than 20%
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2013-03-05 22:06:29 +00:00
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* (default), then we try to increase frequency. Every sampling_rate *
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* sampling_down_factor, we check, if current idle time is more than 80%
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* (default), then we try to decrease frequency
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2012-10-25 22:47:42 +00:00
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*
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2016-11-16 19:27:22 +00:00
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* Frequency updates happen at minimum steps of 5% (default) of maximum
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* frequency
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2012-10-25 22:47:42 +00:00
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*/
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2016-11-08 05:36:33 +00:00
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static unsigned int cs_dbs_update(struct cpufreq_policy *policy)
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2007-10-22 07:50:13 +00:00
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{
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2016-02-07 15:24:26 +00:00
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struct policy_dbs_info *policy_dbs = policy->governor_data;
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2016-02-18 17:40:14 +00:00
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struct cs_policy_dbs_info *dbs_info = to_dbs_info(policy_dbs);
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2016-10-12 19:47:03 +00:00
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unsigned int requested_freq = dbs_info->requested_freq;
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2016-02-07 15:24:26 +00:00
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struct dbs_data *dbs_data = policy_dbs->dbs_data;
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2013-03-27 15:58:58 +00:00
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struct cs_dbs_tuners *cs_tuners = dbs_data->tuners;
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2016-02-15 01:19:31 +00:00
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unsigned int load = dbs_update(policy);
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2016-11-16 17:26:29 +00:00
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unsigned int freq_step;
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2012-10-25 22:47:42 +00:00
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/*
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* break out if we 'cannot' reduce the speed as the user might
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* want freq_step to be zero
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*/
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2013-03-27 15:58:58 +00:00
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if (cs_tuners->freq_step == 0)
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2016-02-15 01:19:31 +00:00
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goto out;
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2012-10-25 22:47:42 +00:00
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2016-10-12 19:47:03 +00:00
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/*
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* If requested_freq is out of range, it is likely that the limits
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* changed in the meantime, so fall back to current frequency in that
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* case.
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*/
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2018-10-15 21:21:05 +00:00
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if (requested_freq > policy->max || requested_freq < policy->min) {
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2016-10-12 19:47:03 +00:00
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requested_freq = policy->cur;
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2018-10-15 21:21:05 +00:00
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dbs_info->requested_freq = requested_freq;
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}
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2016-10-12 19:47:03 +00:00
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2016-11-16 17:26:29 +00:00
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freq_step = get_freq_step(cs_tuners, policy);
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/*
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* Decrease requested_freq one freq_step for each idle period that
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* we didn't update the frequency.
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*/
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if (policy_dbs->idle_periods < UINT_MAX) {
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unsigned int freq_steps = policy_dbs->idle_periods * freq_step;
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2018-10-15 21:21:05 +00:00
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if (requested_freq > policy->min + freq_steps)
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2016-11-16 17:26:29 +00:00
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requested_freq -= freq_steps;
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else
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requested_freq = policy->min;
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policy_dbs->idle_periods = UINT_MAX;
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}
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2012-10-25 22:47:42 +00:00
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/* Check for frequency increase */
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2016-02-09 03:31:32 +00:00
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if (load > dbs_data->up_threshold) {
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2012-10-25 22:47:42 +00:00
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dbs_info->down_skip = 0;
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/* if we are already at full speed then break out early */
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2016-06-13 21:33:49 +00:00
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if (requested_freq == policy->max)
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2016-02-15 01:19:31 +00:00
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goto out;
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2012-10-25 22:47:42 +00:00
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2016-11-16 17:26:29 +00:00
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requested_freq += freq_step;
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2016-10-12 19:47:03 +00:00
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if (requested_freq > policy->max)
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requested_freq = policy->max;
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2013-11-08 05:23:52 +00:00
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2021-09-08 14:05:29 +00:00
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__cpufreq_driver_target(policy, requested_freq,
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CPUFREQ_RELATION_HE);
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2016-10-12 19:47:03 +00:00
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dbs_info->requested_freq = requested_freq;
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2016-02-15 01:19:31 +00:00
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goto out;
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2012-10-25 22:47:42 +00:00
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}
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2013-03-05 22:06:29 +00:00
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/* if sampling_down_factor is active break out early */
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2016-02-09 03:31:32 +00:00
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if (++dbs_info->down_skip < dbs_data->sampling_down_factor)
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2016-02-15 01:19:31 +00:00
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goto out;
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2013-03-05 22:06:29 +00:00
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dbs_info->down_skip = 0;
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2013-03-05 22:06:40 +00:00
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/* Check for frequency decrease */
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if (load < cs_tuners->down_threshold) {
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2012-10-25 22:47:42 +00:00
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/*
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* if we cannot reduce the frequency anymore, break out early
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*/
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2016-06-13 21:33:49 +00:00
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if (requested_freq == policy->min)
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2016-02-15 01:19:31 +00:00
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goto out;
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2012-10-25 22:47:42 +00:00
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2016-11-14 07:00:43 +00:00
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if (requested_freq > freq_step)
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requested_freq -= freq_step;
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2013-11-07 02:28:50 +00:00
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else
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2016-06-13 21:33:49 +00:00
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requested_freq = policy->min;
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2013-02-28 05:38:01 +00:00
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2021-09-08 14:05:29 +00:00
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__cpufreq_driver_target(policy, requested_freq,
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CPUFREQ_RELATION_LE);
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2016-10-12 19:47:03 +00:00
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dbs_info->requested_freq = requested_freq;
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2012-10-25 22:47:42 +00:00
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}
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2015-07-18 06:01:00 +00:00
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2016-02-15 01:19:31 +00:00
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out:
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2016-02-15 01:22:13 +00:00
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return dbs_data->sampling_rate;
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2012-12-27 14:55:41 +00:00
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}
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2005-06-01 02:03:47 +00:00
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/************************** sysfs interface ************************/
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2016-03-22 01:47:51 +00:00
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static ssize_t store_sampling_down_factor(struct gov_attr_set *attr_set,
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const char *buf, size_t count)
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2005-06-01 02:03:47 +00:00
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{
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2016-03-22 01:47:51 +00:00
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struct dbs_data *dbs_data = to_dbs_data(attr_set);
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2005-06-01 02:03:47 +00:00
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unsigned int input;
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int ret;
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2009-01-18 06:39:51 +00:00
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ret = sscanf(buf, "%u", &input);
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2009-02-13 19:02:34 +00:00
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2006-03-22 09:54:10 +00:00
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if (ret != 1 || input > MAX_SAMPLING_DOWN_FACTOR || input < 1)
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2005-06-01 02:03:47 +00:00
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return -EINVAL;
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2016-02-09 03:31:32 +00:00
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dbs_data->sampling_down_factor = input;
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2005-06-01 02:03:47 +00:00
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return count;
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}
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2016-03-22 01:47:51 +00:00
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static ssize_t store_up_threshold(struct gov_attr_set *attr_set,
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const char *buf, size_t count)
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2005-06-01 02:03:47 +00:00
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{
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2016-03-22 01:47:51 +00:00
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struct dbs_data *dbs_data = to_dbs_data(attr_set);
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2013-03-27 15:58:58 +00:00
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struct cs_dbs_tuners *cs_tuners = dbs_data->tuners;
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2005-06-01 02:03:47 +00:00
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unsigned int input;
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int ret;
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2009-01-18 06:39:51 +00:00
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ret = sscanf(buf, "%u", &input);
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2005-06-01 02:03:47 +00:00
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2013-03-27 15:58:58 +00:00
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if (ret != 1 || input > 100 || input <= cs_tuners->down_threshold)
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2005-06-01 02:03:47 +00:00
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return -EINVAL;
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2016-02-09 03:31:32 +00:00
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dbs_data->up_threshold = input;
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2005-06-01 02:03:47 +00:00
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return count;
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}
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2016-03-22 01:47:51 +00:00
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static ssize_t store_down_threshold(struct gov_attr_set *attr_set,
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const char *buf, size_t count)
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2005-06-01 02:03:47 +00:00
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{
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2016-03-22 01:47:51 +00:00
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struct dbs_data *dbs_data = to_dbs_data(attr_set);
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2013-03-27 15:58:58 +00:00
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struct cs_dbs_tuners *cs_tuners = dbs_data->tuners;
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2005-06-01 02:03:47 +00:00
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unsigned int input;
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int ret;
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2009-01-18 06:39:51 +00:00
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ret = sscanf(buf, "%u", &input);
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2005-06-01 02:03:47 +00:00
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2017-06-11 08:28:39 +00:00
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/* cannot be lower than 1 otherwise freq will not fall */
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if (ret != 1 || input < 1 || input > 100 ||
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2016-02-09 03:31:32 +00:00
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input >= dbs_data->up_threshold)
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2005-06-01 02:03:47 +00:00
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return -EINVAL;
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2013-03-27 15:58:58 +00:00
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cs_tuners->down_threshold = input;
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2005-06-01 02:03:47 +00:00
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return count;
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}
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2016-03-22 01:47:51 +00:00
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static ssize_t store_ignore_nice_load(struct gov_attr_set *attr_set,
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const char *buf, size_t count)
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2005-06-01 02:03:47 +00:00
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{
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2016-03-22 01:47:51 +00:00
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struct dbs_data *dbs_data = to_dbs_data(attr_set);
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2016-02-18 01:26:55 +00:00
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unsigned int input;
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2005-06-01 02:03:47 +00:00
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int ret;
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2007-10-22 20:49:09 +00:00
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ret = sscanf(buf, "%u", &input);
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if (ret != 1)
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2005-06-01 02:03:47 +00:00
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return -EINVAL;
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2007-10-22 20:49:09 +00:00
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if (input > 1)
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2005-06-01 02:03:47 +00:00
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input = 1;
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2007-10-22 20:49:09 +00:00
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2016-02-09 03:31:32 +00:00
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if (input == dbs_data->ignore_nice_load) /* nothing to do */
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2005-06-01 02:03:47 +00:00
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return count;
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2011-03-03 20:31:27 +00:00
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2016-02-09 03:31:32 +00:00
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dbs_data->ignore_nice_load = input;
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2005-06-01 02:03:47 +00:00
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2009-02-13 19:02:34 +00:00
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/* we need to re-evaluate prev_cpu_idle */
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2016-02-20 23:51:27 +00:00
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gov_update_cpu_data(dbs_data);
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2016-02-18 01:26:55 +00:00
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2005-06-01 02:03:47 +00:00
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return count;
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}
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2016-03-22 01:47:51 +00:00
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static ssize_t store_freq_step(struct gov_attr_set *attr_set, const char *buf,
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size_t count)
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2005-06-01 02:03:47 +00:00
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{
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2016-03-22 01:47:51 +00:00
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struct dbs_data *dbs_data = to_dbs_data(attr_set);
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2013-03-27 15:58:58 +00:00
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struct cs_dbs_tuners *cs_tuners = dbs_data->tuners;
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2005-06-01 02:03:47 +00:00
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unsigned int input;
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int ret;
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2007-10-22 20:49:09 +00:00
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ret = sscanf(buf, "%u", &input);
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2005-06-01 02:03:47 +00:00
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2007-10-22 20:49:09 +00:00
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if (ret != 1)
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2005-06-01 02:03:47 +00:00
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return -EINVAL;
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2007-10-22 20:49:09 +00:00
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if (input > 100)
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2005-06-01 02:03:47 +00:00
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input = 100;
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2007-10-22 20:49:09 +00:00
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2012-10-25 22:47:42 +00:00
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/*
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* no need to test here if freq_step is zero as the user might actually
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* want this, they would be crazy though :)
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*/
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2013-03-27 15:58:58 +00:00
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cs_tuners->freq_step = input;
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2005-06-01 02:03:47 +00:00
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return count;
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}
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cpufreq: governor: New sysfs show/store callbacks for governor tunables
The ondemand and conservative governors use the global-attr or freq-attr
structures to represent sysfs attributes corresponding to their tunables
(which of them is actually used depends on whether or not different
policy objects can use the same governor with different tunables at the
same time and, consequently, on where those attributes are located in
sysfs).
Unfortunately, in the freq-attr case, the standard cpufreq show/store
sysfs attribute callbacks are applied to the governor tunable attributes
and they always acquire the policy->rwsem lock before carrying out the
operation. That may lead to an ABBA deadlock if governor tunable
attributes are removed under policy->rwsem while one of them is being
accessed concurrently (if sysfs attributes removal wins the race, it
will wait for the access to complete with policy->rwsem held while the
attribute callback will block on policy->rwsem indefinitely).
We attempted to address this issue by dropping policy->rwsem around
governor tunable attributes removal (that is, around invocations of the
->governor callback with the event arg equal to CPUFREQ_GOV_POLICY_EXIT)
in cpufreq_set_policy(), but that opened up race conditions that had not
been possible with policy->rwsem held all the time. Therefore
policy->rwsem cannot be dropped in cpufreq_set_policy() at any point,
but the deadlock situation described above must be avoided too.
To that end, use the observation that in principle governor tunables may
be represented by the same data type regardless of whether the governor
is system-wide or per-policy and introduce a new structure, struct
governor_attr, for representing them and new corresponding macros for
creating show/store sysfs callbacks for them. Also make their parent
kobject use a new kobject type whose default show/store callbacks are
not related to the standard core cpufreq ones in any way (and they don't
acquire policy->rwsem in particular).
Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
Tested-by: Juri Lelli <juri.lelli@arm.com>
Tested-by: Shilpasri G Bhat <shilpa.bhat@linux.vnet.ibm.com>
[ rjw: Subject & changelog + rebase ]
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2016-02-09 03:31:33 +00:00
|
|
|
gov_show_one_common(sampling_rate);
|
|
|
|
gov_show_one_common(sampling_down_factor);
|
|
|
|
gov_show_one_common(up_threshold);
|
|
|
|
gov_show_one_common(ignore_nice_load);
|
|
|
|
gov_show_one(cs, down_threshold);
|
|
|
|
gov_show_one(cs, freq_step);
|
|
|
|
|
|
|
|
gov_attr_rw(sampling_rate);
|
|
|
|
gov_attr_rw(sampling_down_factor);
|
|
|
|
gov_attr_rw(up_threshold);
|
|
|
|
gov_attr_rw(ignore_nice_load);
|
|
|
|
gov_attr_rw(down_threshold);
|
|
|
|
gov_attr_rw(freq_step);
|
|
|
|
|
2021-12-28 13:19:12 +00:00
|
|
|
static struct attribute *cs_attrs[] = {
|
cpufreq: governor: New sysfs show/store callbacks for governor tunables
The ondemand and conservative governors use the global-attr or freq-attr
structures to represent sysfs attributes corresponding to their tunables
(which of them is actually used depends on whether or not different
policy objects can use the same governor with different tunables at the
same time and, consequently, on where those attributes are located in
sysfs).
Unfortunately, in the freq-attr case, the standard cpufreq show/store
sysfs attribute callbacks are applied to the governor tunable attributes
and they always acquire the policy->rwsem lock before carrying out the
operation. That may lead to an ABBA deadlock if governor tunable
attributes are removed under policy->rwsem while one of them is being
accessed concurrently (if sysfs attributes removal wins the race, it
will wait for the access to complete with policy->rwsem held while the
attribute callback will block on policy->rwsem indefinitely).
We attempted to address this issue by dropping policy->rwsem around
governor tunable attributes removal (that is, around invocations of the
->governor callback with the event arg equal to CPUFREQ_GOV_POLICY_EXIT)
in cpufreq_set_policy(), but that opened up race conditions that had not
been possible with policy->rwsem held all the time. Therefore
policy->rwsem cannot be dropped in cpufreq_set_policy() at any point,
but the deadlock situation described above must be avoided too.
To that end, use the observation that in principle governor tunables may
be represented by the same data type regardless of whether the governor
is system-wide or per-policy and introduce a new structure, struct
governor_attr, for representing them and new corresponding macros for
creating show/store sysfs callbacks for them. Also make their parent
kobject use a new kobject type whose default show/store callbacks are
not related to the standard core cpufreq ones in any way (and they don't
acquire policy->rwsem in particular).
Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
Tested-by: Juri Lelli <juri.lelli@arm.com>
Tested-by: Shilpasri G Bhat <shilpa.bhat@linux.vnet.ibm.com>
[ rjw: Subject & changelog + rebase ]
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2016-02-09 03:31:33 +00:00
|
|
|
&sampling_rate.attr,
|
|
|
|
&sampling_down_factor.attr,
|
|
|
|
&up_threshold.attr,
|
|
|
|
&down_threshold.attr,
|
|
|
|
&ignore_nice_load.attr,
|
|
|
|
&freq_step.attr,
|
2005-06-01 02:03:47 +00:00
|
|
|
NULL
|
|
|
|
};
|
2021-12-28 13:19:12 +00:00
|
|
|
ATTRIBUTE_GROUPS(cs);
|
2005-06-01 02:03:47 +00:00
|
|
|
|
|
|
|
/************************** sysfs end ************************/
|
|
|
|
|
2016-02-18 17:40:14 +00:00
|
|
|
static struct policy_dbs_info *cs_alloc(void)
|
|
|
|
{
|
|
|
|
struct cs_policy_dbs_info *dbs_info;
|
|
|
|
|
|
|
|
dbs_info = kzalloc(sizeof(*dbs_info), GFP_KERNEL);
|
|
|
|
return dbs_info ? &dbs_info->policy_dbs : NULL;
|
|
|
|
}
|
|
|
|
|
|
|
|
static void cs_free(struct policy_dbs_info *policy_dbs)
|
|
|
|
{
|
|
|
|
kfree(to_dbs_info(policy_dbs));
|
|
|
|
}
|
|
|
|
|
2016-05-18 20:59:49 +00:00
|
|
|
static int cs_init(struct dbs_data *dbs_data)
|
2013-03-27 15:58:58 +00:00
|
|
|
{
|
|
|
|
struct cs_dbs_tuners *tuners;
|
|
|
|
|
2013-08-06 17:23:06 +00:00
|
|
|
tuners = kzalloc(sizeof(*tuners), GFP_KERNEL);
|
2016-05-18 12:25:26 +00:00
|
|
|
if (!tuners)
|
2013-03-27 15:58:58 +00:00
|
|
|
return -ENOMEM;
|
|
|
|
|
|
|
|
tuners->down_threshold = DEF_FREQUENCY_DOWN_THRESHOLD;
|
2013-03-22 08:03:17 +00:00
|
|
|
tuners->freq_step = DEF_FREQUENCY_STEP;
|
2016-02-09 03:31:32 +00:00
|
|
|
dbs_data->up_threshold = DEF_FREQUENCY_UP_THRESHOLD;
|
|
|
|
dbs_data->sampling_down_factor = DEF_SAMPLING_DOWN_FACTOR;
|
|
|
|
dbs_data->ignore_nice_load = 0;
|
2013-03-27 15:58:58 +00:00
|
|
|
dbs_data->tuners = tuners;
|
2015-06-03 10:27:11 +00:00
|
|
|
|
2013-03-27 15:58:58 +00:00
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
2016-05-18 20:59:49 +00:00
|
|
|
static void cs_exit(struct dbs_data *dbs_data)
|
2013-03-27 15:58:58 +00:00
|
|
|
{
|
|
|
|
kfree(dbs_data->tuners);
|
|
|
|
}
|
|
|
|
|
2016-02-18 01:21:21 +00:00
|
|
|
static void cs_start(struct cpufreq_policy *policy)
|
|
|
|
{
|
2016-02-18 17:40:14 +00:00
|
|
|
struct cs_policy_dbs_info *dbs_info = to_dbs_info(policy->governor_data);
|
2016-02-18 01:21:21 +00:00
|
|
|
|
|
|
|
dbs_info->down_skip = 0;
|
2016-10-12 19:47:03 +00:00
|
|
|
dbs_info->requested_freq = policy->cur;
|
2016-02-18 01:21:21 +00:00
|
|
|
}
|
|
|
|
|
2016-06-13 21:33:49 +00:00
|
|
|
static struct dbs_governor cs_governor = {
|
|
|
|
.gov = CPUFREQ_DBS_GOVERNOR_INITIALIZER("conservative"),
|
2021-12-28 13:19:12 +00:00
|
|
|
.kobj_type = { .default_groups = cs_groups },
|
2016-11-08 05:36:33 +00:00
|
|
|
.gov_dbs_update = cs_dbs_update,
|
2016-06-13 21:33:49 +00:00
|
|
|
.alloc = cs_alloc,
|
|
|
|
.free = cs_free,
|
|
|
|
.init = cs_init,
|
|
|
|
.exit = cs_exit,
|
|
|
|
.start = cs_start,
|
2012-10-25 22:47:42 +00:00
|
|
|
};
|
2005-06-01 02:03:47 +00:00
|
|
|
|
2020-06-29 08:24:59 +00:00
|
|
|
#define CPU_FREQ_GOV_CONSERVATIVE (cs_governor.gov)
|
2005-06-01 02:03:47 +00:00
|
|
|
|
2009-02-13 19:01:01 +00:00
|
|
|
MODULE_AUTHOR("Alexander Clouter <alex@digriz.org.uk>");
|
2009-01-18 06:39:51 +00:00
|
|
|
MODULE_DESCRIPTION("'cpufreq_conservative' - A dynamic cpufreq governor for "
|
2005-06-01 02:03:47 +00:00
|
|
|
"Low Latency Frequency Transition capable processors "
|
|
|
|
"optimised for use in a battery environment");
|
2009-01-18 06:39:51 +00:00
|
|
|
MODULE_LICENSE("GPL");
|
2005-06-01 02:03:47 +00:00
|
|
|
|
2008-01-17 23:21:08 +00:00
|
|
|
#ifdef CONFIG_CPU_FREQ_DEFAULT_GOV_CONSERVATIVE
|
2016-02-05 01:37:42 +00:00
|
|
|
struct cpufreq_governor *cpufreq_default_governor(void)
|
|
|
|
{
|
2020-06-29 08:24:59 +00:00
|
|
|
return &CPU_FREQ_GOV_CONSERVATIVE;
|
2016-02-05 01:37:42 +00:00
|
|
|
}
|
2008-01-17 23:21:08 +00:00
|
|
|
#endif
|
2020-06-29 08:24:59 +00:00
|
|
|
|
|
|
|
cpufreq_governor_init(CPU_FREQ_GOV_CONSERVATIVE);
|
|
|
|
cpufreq_governor_exit(CPU_FREQ_GOV_CONSERVATIVE);
|