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cpufreq: qcom-cpufreq-hw: Update offline CPUs per-cpu thermal pressure

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[ Upstream commit 93d9e6f93e ]

The thermal pressure signal gives information to the scheduler about
reduced CPU capacity due to thermal. It is based on a value stored in
a per-cpu 'thermal_pressure' variable. The online CPUs will get the
new value there, while the offline won't. Unfortunately, when the CPU
is back online, the value read from per-cpu variable might be wrong
(stale data).  This might affect the scheduler decisions, since it
sees the CPU capacity differently than what is actually available.

Fix it by making sure that all online+offline CPUs would get the
proper value in their per-cpu variable when there is throttling
or throttling is removed.

Fixes: 275157b367 ("cpufreq: qcom-cpufreq-hw: Add dcvs interrupt support")
Reviewed-by: Thara Gopinath <thara.gopinath@linaro.org>
Signed-off-by: Lukasz Luba <lukasz.luba@arm.com>
Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Lukasz Luba 2021-11-09 19:57:12 +00:00 committed by Greg Kroah-Hartman
parent 5d39cd2059
commit 929205dc3a
1 changed files with 2 additions and 1 deletions
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3
drivers/cpufreq/qcom-cpufreq-hw.c
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@ -304,7 +304,8 @@ static void qcom_lmh_dcvs_notify(struct qcom_cpufreq_data *data)
if (capacity > max_capacity)
capacity = max_capacity;
arch_set_thermal_pressure(policy->cpus, max_capacity - capacity);
arch_set_thermal_pressure(policy->related_cpus,
max_capacity - capacity);
/*
* In the unlikely case policy is unregistered do not enable