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ANDROID: cpufreq: arch_topology: implement max frequency capping

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Implements the Max Frequency Capping Engine (MFCE) getter function
topology_get_max_freq_scale() to provide the scheduler with a
maximum frequency scaling correction factor for more accurate cpu
capacity handling by being able to deal with max frequency capping.

This scaling factor describes the influence of running a cpu with a
current maximum frequency (policy) lower than the maximum possible
frequency (cpuinfo).

The factor is:

  policy_max_freq(cpu) << SCHED_CAPACITY_SHIFT / cpuinfo_max_freq(cpu)

It also implements the MFCE setter function arch_set_max_freq_scale()
which is called from cpufreq_set_policy().

Change-Id: I59e52861ee260755ab0518fe1f7183a2e4e3d0fc
Signed-off-by: Ionela Voinescu <ionela.voinescu@arm.com>
Signed-off-by: Dietmar Eggemann <dietmar.eggemann@arm.com>
[Trivial cherry-pick issue in cpufreq.c]
Signed-off-by: Quentin Perret <quentin.perret@arm.com>
This commit is contained in:
Dietmar Eggemann
2018-05-10 16:52:33 +01:00
committed by Quentin Perret
parent 27ad2abc03
commit 0cfe39fe40
4 changed files with 42 additions and 1 deletions
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2
include/linux/cpufreq.h
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@@ -984,6 +984,8 @@ extern unsigned int arch_freq_get_on_cpu(int cpu);
extern void arch_set_freq_scale(struct cpumask *cpus, unsigned long cur_freq,
unsigned long max_freq);
extern void arch_set_max_freq_scale(struct cpumask *cpus,
unsigned long policy_max_freq);
/* the following are really really optional */
extern struct freq_attr cpufreq_freq_attr_scaling_available_freqs;