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thermal/cpu-cooling: Update thermal pressure in case of a maximum frequency capping

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Thermal governors can request for a CPU's maximum supported frequency to
be capped in case of an overheat event. This in turn means that the
maximum capacity available for tasks to run on the particular CPU is
reduced. Delta between the original maximum capacity and capped maximum
capacity is known as thermal pressure. Enable cpufreq cooling device to
update the thermal pressure in event of a capped maximum frequency.

Signed-off-by: Thara Gopinath <thara.gopinath@linaro.org>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Link: https://lkml.kernel.org/r/20200222005213.3873-9-thara.gopinath@linaro.org
This commit is contained in:
Thara Gopinath 2020-02-21 19:52:12 -05:00 committed by Ingo Molnar
parent 467b7d01c4
commit f12e4f66ab
1 changed files with 17 additions and 2 deletions
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19
drivers/thermal/cpufreq_cooling.c
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@ -431,6 +431,10 @@ static int cpufreq_set_cur_state(struct thermal_cooling_device *cdev,
unsigned long state)
{
struct cpufreq_cooling_device *cpufreq_cdev = cdev->devdata;
struct cpumask *cpus;
unsigned int frequency;
unsigned long max_capacity, capacity;
int ret;
/* Request state should be less than max_level */
if (WARN_ON(state > cpufreq_cdev->max_level))
@ -442,8 +446,19 @@ static int cpufreq_set_cur_state(struct thermal_cooling_device *cdev,
cpufreq_cdev->cpufreq_state = state;
return freq_qos_update_request(&cpufreq_cdev->qos_req,
get_state_freq(cpufreq_cdev, state));
frequency = get_state_freq(cpufreq_cdev, state);
ret = freq_qos_update_request(&cpufreq_cdev->qos_req, frequency);
if (ret > 0) {
cpus = cpufreq_cdev->policy->cpus;
max_capacity = arch_scale_cpu_capacity(cpumask_first(cpus));
capacity = frequency * max_capacity;
capacity /= cpufreq_cdev->policy->cpuinfo.max_freq;
arch_set_thermal_pressure(cpus, max_capacity - capacity);
}
return ret;
}
/* Bind cpufreq callbacks to thermal cooling device ops */