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cpufreq: Use the fixed and coherent frequency for scaling capacity

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cpuinfo.max_freq can change at runtime because of boost as an example. This
implies that the value could be different from the frequency that has been
used to compute the capacity of a CPU.

The new arch_scale_freq_ref() returns a fixed and coherent frequency
that can be used to compute the capacity for a given frequency.

[ Also fix a arch_set_freq_scale()  newline style wart in <linux/cpufreq.h>. ]

Signed-off-by: Vincent Guittot <vincent.guittot@linaro.org>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Tested-by: Lukasz Luba <lukasz.luba@arm.com>
Reviewed-by: Lukasz Luba <lukasz.luba@arm.com>
Acked-by: Viresh Kumar <viresh.kumar@linaro.org>
Acked-by: Rafael J. Wysocki <rafael@kernel.org>
Link: https://lore.kernel.org/r/20231211104855.558096-3-vincent.guittot@linaro.org
This commit is contained in:
Vincent Guittot 2023-12-11 11:48:50 +01:00 committed by Ingo Molnar
parent 9942cb22ea
commit 599457ba15
2 changed files with 3 additions and 2 deletions
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4
drivers/cpufreq/cpufreq.c
View File

@ -454,7 +454,7 @@ void cpufreq_freq_transition_end(struct cpufreq_policy *policy,
arch_set_freq_scale(policy->related_cpus,
policy->cur,
policy->cpuinfo.max_freq);
arch_scale_freq_ref(policy->cpu));
spin_lock(&policy->transition_lock);
policy->transition_ongoing = false;
@ -2174,7 +2174,7 @@ unsigned int cpufreq_driver_fast_switch(struct cpufreq_policy *policy,
policy->cur = freq;
arch_set_freq_scale(policy->related_cpus, freq,
policy->cpuinfo.max_freq);
arch_scale_freq_ref(policy->cpu));
cpufreq_stats_record_transition(policy, freq);
if (trace_cpu_frequency_enabled()) {

1
include/linux/cpufreq.h
View File

@ -1203,6 +1203,7 @@ void arch_set_freq_scale(const struct cpumask *cpus,
{
}
#endif
/* the following are really really optional */
extern struct freq_attr cpufreq_freq_attr_scaling_available_freqs;
extern struct freq_attr cpufreq_freq_attr_scaling_boost_freqs;