linux-kernel - Re: [PATCH v5 0/6] powercap/drivers/dtpm: Create the dtpm hierarchy

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Date:   Thu, 23 Dec 2021 14:42:13 +0100
From:   Daniel Lezcano <daniel.lezcano@...aro.org>
To:     Ulf Hansson <ulf.hansson@...aro.org>
Cc:     rjw@...ysocki.net, lukasz.luba@....com, robh@...nel.org,
        heiko@...ech.de, arnd@...aro.org, linux-kernel@...r.kernel.org,
        linux-pm@...r.kernel.org
Subject: Re: [PATCH v5 0/6] powercap/drivers/dtpm: Create the dtpm hierarchy


Hi Ulf,

On 23/12/2021 14:32, Ulf Hansson wrote:
> On Thu, 23 Dec 2021 at 14:20, Daniel Lezcano <daniel.lezcano@...aro.org> wrote:
>>
>> Hi all,
>>
>> any comments on this series. Is it fine if I merge it without patch 6/6?
>>
>> Heiko, is the description fine for you in the SoC specific code?
> 
> FYI, I intend to have a closer look at the series next week. Happy holidays!

Ah, ok. Thank you for letting me know.

I'll wait for your feedback then

Thanks

  -- Daniel


>>
>> On 18/12/2021 14:00, Daniel Lezcano wrote:
>>> The DTPM hierarchy is the base to build on top of it a power budget
>>> allocator. It reflects the power consumption of the group of devices
>>> and allows to cap their power.
>>>
>>> The core code is there but there is no way to describe the desired
>>> hierarchy yet.
>>>
>>> A first proposal introduced the description through configfs [1] but
>>> was rejected [2].
>>>
>>> A second proposal based on the device tree with a binding similar to
>>> the power domains [3] was proposed but finally rejected [4].
>>>
>>> This fifth version delegates the hierarchy creation to the SoC with a
>>> specific and self-encapsulated code using an array to describe the tree. The
>>> SoC DTPM driver defines an array of nodes pointing to their parents.  The
>>> hierarchy description can integrate a DT node and in the future a SCMI node,
>>> that means the description can mix different type of nodes.
>>>
>>> In addition to the hierarchy creation, the devfreq dtpm support is also
>>> integrated into this series.
>>>
>>> This series was tested on a rock960 (revision B - rk3399 based) and a
>>> db845c (Qualcomm sdm845 based).
>>>
>>> [1] https://lore.kernel.org/all/20210401183654.27214-1-daniel.lezcano@linaro.org/
>>> [2] https://lore.kernel.org/all/YGYg6ZeZ1181%2FpXk@kroah.com/
>>> [3] https://lore.kernel.org/all/20211205231558.779698-1-daniel.lezcano@linaro.org/
>>> [4] https://lore.kernel.org/all/YbfFapsmsjs4qnsg@robh.at.kernel.org/
>>>
>>> Changelog:
>>>    V5:
>>>    - Remove DT bindings
>>>    - Added description with an array
>>>    - Added simple description for rk3399 and sdm845
>>>    - Moved dtpm table to the data section
>>>
>>>    V4:
>>>    - Added missing powerzone-cells
>>>    - Changed powerzone name to comply with the pattern property
>>>
>>>    V3:
>>>    - Remove GPU section as no power is available (yet)
>>>    - Remove '#powerzone-cells' conforming to the bindings change
>>>    - Removed required property 'compatible'
>>>    - Removed powerzone-cells from the topmost node
>>>    - Removed powerzone-cells from cpus 'consumers' in example
>>>    - Set additionnal property to false
>>>
>>>    V2:
>>>    - Added pattern properties and stick to powerzone-*
>>>    - Added required property compatible and powerzone-cells
>>>    - Added additionnal property
>>>    - Added compatible
>>>    - Renamed to 'powerzones'
>>>    - Added missing powerzone-cells to the topmost node
>>>    - Fixed errors reported by 'make DT_CHECKER_FLAGS=-m dt_binding_check'
>>>    - Move description in the SoC dtsi specific file
>>>    - Fixed missing prototype warning reported by lkp@
>>>
>>>    V1: Initial post
>>>
>>> Daniel Lezcano (6):
>>>   powercap/drivers/dtpm: Move dtpm table from init to data section
>>>   powercap/drivers/dtpm: Add hierarchy creation
>>>   powercap/drivers/dtpm: Add CPU DT initialization support
>>>   powercap/drivers/dtpm: Add dtpm devfreq with energy model support
>>>   rockchip/soc/drivers: Add DTPM description for rk3399
>>>   qcom/soc/drivers: Add DTPM description for sdm845
>>>
>>>  drivers/powercap/Kconfig          |   8 ++
>>>  drivers/powercap/Makefile         |   1 +
>>>  drivers/powercap/dtpm.c           | 155 ++++++++++++++++++++++-
>>>  drivers/powercap/dtpm_cpu.c       |  37 ++++--
>>>  drivers/powercap/dtpm_devfreq.c   | 201 ++++++++++++++++++++++++++++++
>>>  drivers/soc/qcom/Kconfig          |   9 ++
>>>  drivers/soc/qcom/Makefile         |   1 +
>>>  drivers/soc/qcom/dtpm.c           |  65 ++++++++++
>>>  drivers/soc/rockchip/Kconfig      |   8 ++
>>>  drivers/soc/rockchip/Makefile     |   1 +
>>>  drivers/soc/rockchip/dtpm.c       |  56 +++++++++
>>>  include/asm-generic/vmlinux.lds.h |   4 +-
>>>  include/linux/dtpm.h              |  21 +++-
>>>  13 files changed, 551 insertions(+), 16 deletions(-)
>>>  create mode 100644 drivers/powercap/dtpm_devfreq.c
>>>  create mode 100644 drivers/soc/qcom/dtpm.c
>>>  create mode 100644 drivers/soc/rockchip/dtpm.c
>>>
>>
>>
>> --
>> <http://www.linaro.org/> Linaro.org │ Open source software for ARM SoCs
>>
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