linux-kernel - Re: [PATCH v3 6/7] thermal/drivers/cpu_cooling: Introduce the cpu idle cooling driver

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Date:   Mon, 16 Apr 2018 14:49:35 +0200
From:   Daniel Lezcano <daniel.lezcano@...aro.org>
To:     Sudeep Holla <sudeep.holla@....com>
Cc:     Viresh Kumar <viresh.kumar@...aro.org>, edubezval@...il.com,
        kevin.wangtao@...aro.org, leo.yan@...aro.org,
        vincent.guittot@...aro.org, linux-kernel@...r.kernel.org,
        javi.merino@...nel.org, rui.zhang@...el.com,
        daniel.thompson@...aro.org, linux-pm@...r.kernel.org,
        Amit Daniel Kachhap <amit.kachhap@...il.com>
Subject: Re: [PATCH v3 6/7] thermal/drivers/cpu_cooling: Introduce the cpu
 idle cooling driver

On 16/04/2018 14:31, Sudeep Holla wrote:
> On Mon, Apr 16, 2018 at 02:10:30PM +0200, Daniel Lezcano wrote:
>> On 16/04/2018 12:10, Viresh Kumar wrote:
>>> On 16-04-18, 12:03, Daniel Lezcano wrote:
>>>> On 16/04/2018 11:50, Viresh Kumar wrote:
>>>>> On 16-04-18, 11:45, Daniel Lezcano wrote:
>>>>>> Can you elaborate a bit ? I'm not sure to get the point.
>>>>>
>>>>> Sure. With your current code on Hikey960 (big/LITTLE), you end up
>>>>> creating two cooling devices, one for the big cluster and one for
>>>>> small cluster. Which is the right thing to do, as we also have two
>>>>> cpufreq cooling devices.
>>>>>
>>>>> But with the change Sudeep is referring to, the helper you used to get
>>>>> cluster id will return 0 (SoC id) for all the 8 CPUs. So your code
>>>>> will end up creating a single cpuidle cooling device for all the CPUs.
>>>>> Which would be wrong.
>>>>
>>>> Is the semantic of topology_physical_package_id changing ?
>>>
>>> That's what I understood from his email.
>>>
>>>> I don't
>>>> understand the change Sudeep is referring to.
>>
>> Actually there is no impact with the change Sudeep is referring to. It
>> is for ACPI, we are DT based. Confirmed with Jeremy.
>>
> 
> No, it will change for DT. The aim is to be consistent irrespective of
> h/w or f/w description(i.e ADCPI or DT)

What will happen with the code using topology_physical_package_id ?

drivers/acpi/processor_thermal.c:       int id =
topology_physical_package_id(cpu);

drivers/acpi/processor_thermal.c:               if
(topology_physical_package_id(i) == id)

drivers/acpi/processor_thermal.c:               if
(topology_physical_package_id(i) ==

drivers/acpi/processor_thermal.c:
topology_physical_package_id(cpu))

drivers/block/mtip32xx/mtip32xx.c:
topology_physical_package_id(cpumask_first(node_mask)),

drivers/cpufreq/arm_big_little.c:       return
topology_physical_package_id(cpu);

drivers/crypto/qat/qat_common/adf_common_drv.h: return
topology_physical_package_id(smp_processor_id());

drivers/crypto/virtio/virtio_crypto_common.h:   node =
topology_physical_package_id(cpu);

kernel/events/core.c:           event_pkg =
topology_physical_package_id(event_cpu);

kernel/events/core.c:           local_pkg =
topology_physical_package_id(local_cpu);





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