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From: Lukasz Luba <lukasz.luba@arm.com>
To: Quentin Perret <qperret@google.com>,
	Viresh Kumar <viresh.kumar@linaro.org>
Cc: 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 15:09:13 +0100	[thread overview]
Message-ID: <b02cff82-d242-f783-6f29-78e734f78e26@arm.com> (raw)
In-Reply-To: <YRPN8zjp1wqkHg6t@google.com>



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.

> instead? That should simplify the patch a bit.
> 
> Also, we can probably afford calling dev_pm_opp_get_opp_count() from the
> em_register callback as it is not a hot path, which would avoid wasting
> some 'resident' memory here that is only used during init.
> 
> Thanks,
> Quentin
> 

  reply	other threads:[~2021-08-11 14:09 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 [this message]
2021-08-11 14:39       ` Quentin Perret
2021-08-11 15:52         ` Lukasz Luba
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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