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SubjectRe: [RESEND][PATCH 7/8] thermal: cooling: Check Energy Model type in cpufreq_cooling and devfreq_cooling
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On 3/28/22 04:27, Viresh Kumar wrote:
> On 21-03-22, 09:57, Lukasz Luba wrote:
>> The Energy Model can now be artificial, which means the power values
>> are mathematically generated to leverage EAS while not expected to be on
>> an uniform scale with other devices providing power information. If this
>> EM type is in use, the thermal governor IPA should not be allowed to
>> operate, since the relation between cooling devices is not properly
>> defined. Thus, it might be possible that big GPU has lower power values
>> than a Little CPU. To mitigate a misbehaviour of the thermal control
>> algorithm, simply do not register the cooling device as IPA's power
>> actor.
>>
>> Signed-off-by: Lukasz Luba <lukasz.luba@arm.com>
>> ---
>> drivers/thermal/cpufreq_cooling.c | 2 +-
>> drivers/thermal/devfreq_cooling.c | 8 +++++---
>> 2 files changed, 6 insertions(+), 4 deletions(-)
>>
>> diff --git a/drivers/thermal/cpufreq_cooling.c b/drivers/thermal/cpufreq_cooling.c
>> index 0bfb8eebd126..b8151d95a806 100644
>> --- a/drivers/thermal/cpufreq_cooling.c
>> +++ b/drivers/thermal/cpufreq_cooling.c
>> @@ -328,7 +328,7 @@ static inline bool em_is_sane(struct cpufreq_cooling_device *cpufreq_cdev,
>> struct cpufreq_policy *policy;
>> unsigned int nr_levels;
>>
>> - if (!em)
>> + if (!em || em_is_artificial(em))
>> return false;
>>
>> policy = cpufreq_cdev->policy;
>> diff --git a/drivers/thermal/devfreq_cooling.c b/drivers/thermal/devfreq_cooling.c
>> index 4310cb342a9f..b04dcbbf721a 100644
>> --- a/drivers/thermal/devfreq_cooling.c
>> +++ b/drivers/thermal/devfreq_cooling.c
>> @@ -358,6 +358,7 @@ of_devfreq_cooling_register_power(struct device_node *np, struct devfreq *df,
>> struct thermal_cooling_device *cdev;
>> struct device *dev = df->dev.parent;
>> struct devfreq_cooling_device *dfc;
>> + struct em_perf_domain *em;
>> char *name;
>> int err, num_opps;
>>
>> @@ -367,8 +368,9 @@ of_devfreq_cooling_register_power(struct device_node *np, struct devfreq *df,
>>
>> dfc->devfreq = df;
>>
>> - dfc->em_pd = em_pd_get(dev);
>> - if (dfc->em_pd) {
>> + em = em_pd_get(dev);
>> + if (em && !em_is_artificial(em)) {
>> + dfc->em_pd = em;
>> devfreq_cooling_ops.get_requested_power =
>> devfreq_cooling_get_requested_power;
>> devfreq_cooling_ops.state2power = devfreq_cooling_state2power;
>> @@ -379,7 +381,7 @@ of_devfreq_cooling_register_power(struct device_node *np, struct devfreq *df,
>> num_opps = em_pd_nr_perf_states(dfc->em_pd);
>> } else {
>> /* Backward compatibility for drivers which do not use IPA */
>> - dev_dbg(dev, "missing EM for cooling device\n");
>> + dev_dbg(dev, "missing proper EM for cooling device\n");
>>
>> num_opps = dev_pm_opp_get_opp_count(dev);
>
> Acked-by: Viresh Kumar <viresh.kumar@linaro.org>
>

Thank you Viresh for the ACK!

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