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From: Lukasz Luba <lukasz.luba@arm.com>
To: Quentin Perret <qperret@google.com>
Cc: Viresh Kumar <viresh.kumar@linaro.org>,
	Rafael Wysocki <rjw@rjwysocki.net>,
	Sudeep Holla <sudeep.holla@arm.com>,
	Cristian Marussi <cristian.marussi@arm.com>,
	linux-pm@vger.kernel.org,
	Vincent Guittot <vincent.guittot@linaro.org>,
	linux-arm-kernel@lists.infradead.org,
	linux-kernel@vger.kernel.org
Subject: Re: [PATCH V2 9/9] cpufreq: scmi: Use .register_em() callback
Date: Wed, 11 Aug 2021 16:52:55 +0100	[thread overview]
Message-ID: <31d73514-0d60-3239-a727-0ae483f11c31@arm.com> (raw)
In-Reply-To: <YRPhI3AOAJLpQnjT@google.com>



On 8/11/21 3:39 PM, Quentin Perret wrote:
> On Wednesday 11 Aug 2021 at 15:09:13 (+0100), Lukasz Luba wrote:
>>
>>
>> On 8/11/21 2:17 PM, Quentin Perret wrote:
>>> On Wednesday 11 Aug 2021 at 17:28:47 (+0530), Viresh Kumar wrote:
>>>> Set the newly added .register_em() callback to register with the EM
>>>> after the cpufreq policy is properly initialized.
>>>>
>>>> Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
>>>> ---
>>>>    drivers/cpufreq/scmi-cpufreq.c | 55 ++++++++++++++++++++--------------
>>>>    1 file changed, 32 insertions(+), 23 deletions(-)
>>>>
>>>> diff --git a/drivers/cpufreq/scmi-cpufreq.c b/drivers/cpufreq/scmi-cpufreq.c
>>>> index 75f818d04b48..b916c9e22921 100644
>>>> --- a/drivers/cpufreq/scmi-cpufreq.c
>>>> +++ b/drivers/cpufreq/scmi-cpufreq.c
>>>> @@ -22,7 +22,9 @@
>>>>    struct scmi_data {
>>>>    	int domain_id;
>>>> +	int nr_opp;
>>>>    	struct device *cpu_dev;
>>>> +	cpumask_var_t opp_shared_cpus;
>>>
>>> Can we use policy->related_cpus and friends directly in the callback
>>
>> Unfortunately not. This tricky setup code was introduced because we may
>> have a platform with per-CPU policy, so single bit set in
>> policy->related_cpus, but we want EAS to be still working on set
>> of CPUs. That's why we construct temporary cpumask and pass it to EM.
> 
> Aha, I see this now. Hmm, those platforms better have AMUs then,
> otherwise PELT signals will be wonky ...

That's the plan, to have the AMUs. We suggest that, but reality would
tell... ;)

> 
> I was going to suggest using dev_pm_opp_get_sharing_cpus() from the
> callback instead, but maybe that's overkill as we'd need to allocate a
> temporary cpumask and all. So n/m this patch should be fine as is.
> 

  reply	other threads:[~2021-08-11 15:54 UTC|newest]

Thread overview: 19+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-08-11 11:58 [PATCH V2 0/9] cpufreq: Auto-register with energy model Viresh Kumar
2021-08-11 11:58 ` [PATCH V2 1/9] cpufreq: Auto-register with energy model if asked Viresh Kumar
2021-08-11 13:02   ` Quentin Perret
2021-08-11 14:30   ` Lukasz Luba
2021-08-11 11:58 ` [PATCH V2 2/9] cpufreq: dt: Use auto-registration for energy model Viresh Kumar
2021-08-11 11:58 ` [PATCH V2 3/9] cpufreq: imx6q: " Viresh Kumar
2021-08-11 11:58 ` [PATCH V2 4/9] cpufreq: mediatek: " Viresh Kumar
2021-08-11 11:58 ` [PATCH V2 5/9] cpufreq: omap: " Viresh Kumar
2021-08-11 11:58 ` [PATCH V2 6/9] cpufreq: qcom-cpufreq-hw: " Viresh Kumar
2021-08-11 11:58 ` [PATCH V2 7/9] cpufreq: scpi: " Viresh Kumar
2021-08-11 11:58 ` [PATCH V2 8/9] cpufreq: vexpress: " Viresh Kumar
2021-08-11 11:58 ` [PATCH V2 9/9] cpufreq: scmi: Use .register_em() callback Viresh Kumar
2021-08-11 13:17   ` Quentin Perret
2021-08-11 14:09     ` Lukasz Luba
2021-08-11 14:39       ` Quentin Perret
2021-08-11 15:52         ` Lukasz Luba [this message]
2021-08-12  3:53     ` Viresh Kumar
2021-08-11 16:32   ` Lukasz Luba
2021-08-12  4:22     ` Viresh Kumar

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