linux-kernel - Re: [PATCH v5 0/4] powercap/dtpm: Add the DTPM framework

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Date:   Fri, 11 Dec 2020 11:39:21 +0100
From:   Daniel Lezcano <daniel.lezcano@...aro.org>
To:     rjw@...ysocki.net
Cc:     linux-pm@...r.kernel.org, linux-kernel@...r.kernel.org,
        Thara Gopinath <thara.gopinath@...aro.org>,
        Lina Iyer <ilina@...eaurora.org>,
        Ram Chandrasekar <rkumbako@...eaurora.org>,
        Zhang Rui <rui.zhang@...el.com>,
        Lukasz Luba <lukasz.luba@....com>
Subject: Re: [PATCH v5 0/4] powercap/dtpm: Add the DTPM framework


Hi Rafael,

I believe I took into account all the comments, do you think it is
possible to merge this series ?



On 08/12/2020 17:41, Daniel Lezcano wrote:
> The density of components greatly increased the last decade bringing a
> numerous number of heating sources which are monitored by more than 20
> sensors on recent SoC. The skin temperature, which is the case
> temperature of the device, must stay below approximately 45°C in order
> to comply with the legal requirements.
> 
> The skin temperature is managed as a whole by an user space daemon,
> which is catching the current application profile, to allocate a power
> budget to the different components where the resulting heating effect
> will comply with the skin temperature constraint.
> 
> This technique is called the Dynamic Thermal Power Management.
> 
> The Linux kernel does not provide any unified interface to act on the
> power of the different devices. Currently, the thermal framework is
> changed to export artificially the performance states of different
> devices via the cooling device software component with opaque values.
> This change is done regardless of the in-kernel logic to mitigate the
> temperature. The user space daemon uses all the available knobs to act
> on the power limit and those differ from one platform to another.
> 
> This series provides a Dynamic Thermal Power Management framework to
> provide an unified way to act on the power of the devices.
> 
> Changelog:
>  V5:
>   - Fixed typos in documentation
>   - Added a dtpm NULL pointer check in the dtpm_register() function
>  V4:
>   - Changed fine grain spinlocks by global tree mutex lock
>     - Dropped tested by tag from Lukasz
>   - Fixed rollback routine in dtpm_cpu
>   - Checked freq_qos_request_active() when releasing the dtpm_cpu node
>  V3:
>   - Fixed power-limit computation in addition with the hotplugging
>   - Improved the encapsulation
>   - Added specific ops for the leaves of the tree
>   - Simplified API and self-encapsulation
>   - Fixed documentation and generated it to check the content
>  V2:
>   - Fixed indentation
>   - Fixed typos in comments
>   - Fixed missing kfree for dtpm_cpu
>   - Capitalize letters in the Kconfig description
>   - Reduced name description
>   - Stringified section name
>   - Added more debug traces in the code
>   - Removed duplicate initialization in the dtpm cpu
> 
> Daniel Lezcano (4):
>   units: Add Watt units
>   Documentation/powercap/dtpm: Add documentation for dtpm
>   powercap/drivers/dtpm: Add API for dynamic thermal power management
>   powercap/drivers/dtpm: Add CPU energy model based support
> 
>  Documentation/power/index.rst         |   1 +
>  Documentation/power/powercap/dtpm.rst | 212 ++++++++++++
>  drivers/powercap/Kconfig              |  13 +
>  drivers/powercap/Makefile             |   2 +
>  drivers/powercap/dtpm.c               | 473 ++++++++++++++++++++++++++
>  drivers/powercap/dtpm_cpu.c           | 257 ++++++++++++++
>  include/asm-generic/vmlinux.lds.h     |  11 +
>  include/linux/cpuhotplug.h            |   1 +
>  include/linux/dtpm.h                  |  77 +++++
>  include/linux/units.h                 |   4 +
>  10 files changed, 1051 insertions(+)
>  create mode 100644 Documentation/power/powercap/dtpm.rst
>  create mode 100644 drivers/powercap/dtpm.c
>  create mode 100644 drivers/powercap/dtpm_cpu.c
>  create mode 100644 include/linux/dtpm.h
> 
> Cc: Thara Gopinath <thara.gopinath@...aro.org>
> Cc: Lina Iyer <ilina@...eaurora.org>
> Cc: Ram Chandrasekar <rkumbako@...eaurora.org>
> Cc: Zhang Rui <rui.zhang@...el.com>
> Cc: Lukasz Luba <lukasz.luba@....com>
> 
> --
> 2.17.1
> 


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