From 4cccf7555770b787fa80791a1407a27301f03920 Mon Sep 17 00:00:00 2001 From: "Rafael J. Wysocki" Date: Mon, 15 Feb 2016 02:19:31 +0100 Subject: [PATCH] cpufreq: governor: Get rid of the ->gov_check_cpu callback The way the ->gov_check_cpu governor callback is used by the ondemand and conservative governors is not really straightforward. Namely, the governor calls dbs_check_cpu() that updates the load information for the policy and the invokes ->gov_check_cpu() for the governor. To get rid of that entanglement, notice that cpufreq_governor_limits() doesn't need to call dbs_check_cpu() directly. Instead, it can simply reset the sample delay to 0 which will cause a sample to be taken immediately. The result of that is practically equivalent to calling dbs_check_cpu() except that it will trigger a full update of governor internal state and not just the ->gov_check_cpu() part. Following that observation, make cpufreq_governor_limits() reset the sample delay and turn dbs_check_cpu() into a function that will simply evaluate the load and return the result called dbs_update(). That function can now be called by governors from the routines that previously were pointed to by ->gov_check_cpu and those routines can be called directly by each governor instead of dbs_check_cpu(). This way ->gov_check_cpu becomes unnecessary, so drop it. Signed-off-by: Rafael J. Wysocki Acked-by: Viresh Kumar --- drivers/cpufreq/cpufreq_conservative.c | 26 +++++++++----------------- drivers/cpufreq/cpufreq_governor.c | 15 ++++++++------- drivers/cpufreq/cpufreq_governor.h | 3 +-- drivers/cpufreq/cpufreq_ondemand.c | 15 +++++++++------ 4 files changed, 27 insertions(+), 32 deletions(-) diff --git a/drivers/cpufreq/cpufreq_conservative.c b/drivers/cpufreq/cpufreq_conservative.c index 6243502ce24d..2e9040e8640c 100644 --- a/drivers/cpufreq/cpufreq_conservative.c +++ b/drivers/cpufreq/cpufreq_conservative.c @@ -44,20 +44,20 @@ static inline unsigned int get_freq_target(struct cs_dbs_tuners *cs_tuners, * Any frequency increase takes it to the maximum frequency. Frequency reduction * happens at minimum steps of 5% (default) of maximum frequency */ -static void cs_check_cpu(int cpu, unsigned int load) +static unsigned int cs_dbs_timer(struct cpufreq_policy *policy) { - struct cs_cpu_dbs_info_s *dbs_info = &per_cpu(cs_cpu_dbs_info, cpu); - struct cpufreq_policy *policy = dbs_info->cdbs.policy_dbs->policy; + struct cs_cpu_dbs_info_s *dbs_info = &per_cpu(cs_cpu_dbs_info, policy->cpu); struct policy_dbs_info *policy_dbs = policy->governor_data; struct dbs_data *dbs_data = policy_dbs->dbs_data; struct cs_dbs_tuners *cs_tuners = dbs_data->tuners; + unsigned int load = dbs_update(policy); /* * break out if we 'cannot' reduce the speed as the user might * want freq_step to be zero */ if (cs_tuners->freq_step == 0) - return; + goto out; /* Check for frequency increase */ if (load > dbs_data->up_threshold) { @@ -65,7 +65,7 @@ static void cs_check_cpu(int cpu, unsigned int load) /* if we are already at full speed then break out early */ if (dbs_info->requested_freq == policy->max) - return; + goto out; dbs_info->requested_freq += get_freq_target(cs_tuners, policy); @@ -74,12 +74,12 @@ static void cs_check_cpu(int cpu, unsigned int load) __cpufreq_driver_target(policy, dbs_info->requested_freq, CPUFREQ_RELATION_H); - return; + goto out; } /* if sampling_down_factor is active break out early */ if (++dbs_info->down_skip < dbs_data->sampling_down_factor) - return; + goto out; dbs_info->down_skip = 0; /* Check for frequency decrease */ @@ -89,7 +89,7 @@ static void cs_check_cpu(int cpu, unsigned int load) * if we cannot reduce the frequency anymore, break out early */ if (policy->cur == policy->min) - return; + goto out; freq_target = get_freq_target(cs_tuners, policy); if (dbs_info->requested_freq > freq_target) @@ -99,16 +99,9 @@ static void cs_check_cpu(int cpu, unsigned int load) __cpufreq_driver_target(policy, dbs_info->requested_freq, CPUFREQ_RELATION_L); - return; } -} - -static unsigned int cs_dbs_timer(struct cpufreq_policy *policy) -{ - struct policy_dbs_info *policy_dbs = policy->governor_data; - struct dbs_data *dbs_data = policy_dbs->dbs_data; - dbs_check_cpu(policy); + out: return delay_for_sampling_rate(dbs_data->sampling_rate); } @@ -300,7 +293,6 @@ static struct dbs_governor cs_dbs_gov = { .get_cpu_cdbs = get_cpu_cdbs, .get_cpu_dbs_info_s = get_cpu_dbs_info_s, .gov_dbs_timer = cs_dbs_timer, - .gov_check_cpu = cs_check_cpu, .init = cs_init, .exit = cs_exit, }; diff --git a/drivers/cpufreq/cpufreq_governor.c b/drivers/cpufreq/cpufreq_governor.c index 1f580cb62902..99d25af6485b 100644 --- a/drivers/cpufreq/cpufreq_governor.c +++ b/drivers/cpufreq/cpufreq_governor.c @@ -140,9 +140,8 @@ static const struct sysfs_ops governor_sysfs_ops = { .store = governor_store, }; -void dbs_check_cpu(struct cpufreq_policy *policy) +unsigned int dbs_update(struct cpufreq_policy *policy) { - int cpu = policy->cpu; struct dbs_governor *gov = dbs_governor_of(policy); struct policy_dbs_info *policy_dbs = policy->governor_data; struct dbs_data *dbs_data = policy_dbs->dbs_data; @@ -154,7 +153,7 @@ void dbs_check_cpu(struct cpufreq_policy *policy) if (gov->governor == GOV_ONDEMAND) { struct od_cpu_dbs_info_s *od_dbs_info = - gov->get_cpu_dbs_info_s(cpu); + gov->get_cpu_dbs_info_s(policy->cpu); /* * Sometimes, the ondemand governor uses an additional @@ -250,10 +249,9 @@ void dbs_check_cpu(struct cpufreq_policy *policy) if (load > max_load) max_load = load; } - - gov->gov_check_cpu(cpu, max_load); + return max_load; } -EXPORT_SYMBOL_GPL(dbs_check_cpu); +EXPORT_SYMBOL_GPL(dbs_update); void gov_set_update_util(struct policy_dbs_info *policy_dbs, unsigned int delay_us) @@ -601,11 +599,14 @@ static int cpufreq_governor_limits(struct cpufreq_policy *policy) struct policy_dbs_info *policy_dbs = policy->governor_data; mutex_lock(&policy_dbs->timer_mutex); + if (policy->max < policy->cur) __cpufreq_driver_target(policy, policy->max, CPUFREQ_RELATION_H); else if (policy->min > policy->cur) __cpufreq_driver_target(policy, policy->min, CPUFREQ_RELATION_L); - dbs_check_cpu(policy); + + gov_update_sample_delay(policy_dbs, 0); + mutex_unlock(&policy_dbs->timer_mutex); return 0; diff --git a/drivers/cpufreq/cpufreq_governor.h b/drivers/cpufreq/cpufreq_governor.h index 521daac38ba5..38b9512820b0 100644 --- a/drivers/cpufreq/cpufreq_governor.h +++ b/drivers/cpufreq/cpufreq_governor.h @@ -202,7 +202,6 @@ struct dbs_governor { struct cpu_dbs_info *(*get_cpu_cdbs)(int cpu); void *(*get_cpu_dbs_info_s)(int cpu); unsigned int (*gov_dbs_timer)(struct cpufreq_policy *policy); - void (*gov_check_cpu)(int cpu, unsigned int load); int (*init)(struct dbs_data *dbs_data, bool notify); void (*exit)(struct dbs_data *dbs_data, bool notify); @@ -235,7 +234,7 @@ static inline int delay_for_sampling_rate(unsigned int sampling_rate) } extern struct mutex dbs_data_mutex; -void dbs_check_cpu(struct cpufreq_policy *policy); +unsigned int dbs_update(struct cpufreq_policy *policy); int cpufreq_governor_dbs(struct cpufreq_policy *policy, unsigned int event); void od_register_powersave_bias_handler(unsigned int (*f) (struct cpufreq_policy *, unsigned int, unsigned int), diff --git a/drivers/cpufreq/cpufreq_ondemand.c b/drivers/cpufreq/cpufreq_ondemand.c index 0b79f1488be4..707c017f4e67 100644 --- a/drivers/cpufreq/cpufreq_ondemand.c +++ b/drivers/cpufreq/cpufreq_ondemand.c @@ -150,13 +150,13 @@ static void dbs_freq_increase(struct cpufreq_policy *policy, unsigned int freq) * (default), then we try to increase frequency. Else, we adjust the frequency * proportional to load. */ -static void od_check_cpu(int cpu, unsigned int load) +static void od_update(struct cpufreq_policy *policy) { - struct od_cpu_dbs_info_s *dbs_info = &per_cpu(od_cpu_dbs_info, cpu); + struct od_cpu_dbs_info_s *dbs_info = &per_cpu(od_cpu_dbs_info, policy->cpu); struct policy_dbs_info *policy_dbs = dbs_info->cdbs.policy_dbs; - struct cpufreq_policy *policy = policy_dbs->policy; struct dbs_data *dbs_data = policy_dbs->dbs_data; struct od_dbs_tuners *od_tuners = dbs_data->tuners; + unsigned int load = dbs_update(policy); dbs_info->freq_lo = 0; @@ -198,12 +198,16 @@ static unsigned int od_dbs_timer(struct cpufreq_policy *policy) /* Common NORMAL_SAMPLE setup */ dbs_info->sample_type = OD_NORMAL_SAMPLE; - if (sample_type == OD_SUB_SAMPLE) { + /* + * OD_SUB_SAMPLE doesn't make sense if sample_delay_ns is 0, so ignore + * it then. + */ + if (sample_type == OD_SUB_SAMPLE && policy_dbs->sample_delay_ns > 0) { delay = dbs_info->freq_lo_jiffies; __cpufreq_driver_target(policy, dbs_info->freq_lo, CPUFREQ_RELATION_H); } else { - dbs_check_cpu(policy); + od_update(policy); if (dbs_info->freq_lo) { /* Setup timer for SUB_SAMPLE */ dbs_info->sample_type = OD_SUB_SAMPLE; @@ -428,7 +432,6 @@ static struct dbs_governor od_dbs_gov = { .get_cpu_cdbs = get_cpu_cdbs, .get_cpu_dbs_info_s = get_cpu_dbs_info_s, .gov_dbs_timer = od_dbs_timer, - .gov_check_cpu = od_check_cpu, .gov_ops = &od_ops, .init = od_init, .exit = od_exit, -- 2.20.1