linux-kernel - Re: [PATCH V2 0/3] soc: qcom: boot_stats: Add driver support for boot

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Date:   Fri, 7 Apr 2023 08:44:35 -0700
From:   Bjorn Andersson <andersson@...nel.org>
To:     Souradeep Chowdhury <quic_schowdhu@...cinc.com>
Cc:     Andy Gross <agross@...nel.org>,
        Konrad Dybcio <konrad.dybcio@...ainline.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Rob Herring <robh+dt@...nel.org>,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-arm-msm@...r.kernel.org, devicetree@...r.kernel.org,
        Sibi Sankar <quic_sibis@...cinc.com>,
        Rajendra Nayak <quic_rjendra@...cinc.com>
Subject: Re: [PATCH V2 0/3] soc: qcom: boot_stats: Add driver support for
 boot_stats

On Fri, Apr 07, 2023 at 07:34:34PM +0530, Souradeep Chowdhury wrote:
> Qualcomm's proprietary Android boot-loaders capture boot time
> stats, like the time when the bootloader started execution and at what
> point the bootloader handed over control to the kernel etc. in the IMEM
> region. This information is captured in a specific format by this driver
> by mapping a structure to the IMEM memory region and then accessing the
> members of the structure to print the information. This information is
> useful in verifying if existing boot KPIs have regressed or not.
> A sample log in SM8450(waipio) device is as follows:-
> 
> KPI: Pre ABL Time = 3s
> KPI: ABL Time = 14s
> KPI: Kernel MPM timestamp = 890206
> 
> The Module Power Manager(MPM) sleep counter starts ticking at the PBL
> stage and the timestamp generated by the sleep counter is logged by
> the Qualcomm proprietary bootloader(ABL) at two points-> First when it
> starts execution which is logged here as "Pre ABL Time" and the second
> when it is about to load the kernel logged as "ABL Time". Both these
> values are read up by the driver from IMEM region and printed as above.
> The current sleep counter timestamp is also logged by the driver.
> 
> Changes in V2
> 
> *Implemented comments on version 1 of the patch

This doesn't give a particular good indication of what you actually
changed. So please spell it out going forward.

Thanks,
Bjorn

> 
> *Changed the boot_stats driver to module_platform_driver
> 
> *Dropped the DT binding for mpm sleep counter
> 
> Souradeep Chowdhury (3):
>   dt-bindings: sram: qcom,imem: Add Boot Stat region within IMEM
>   soc: qcom: boot_stat: Add Driver Support for Boot Stats
>   MAINTAINERS: Add the entry for boot_stats driver support
> 
>  .../devicetree/bindings/sram/qcom,imem.yaml        | 21 +++++
>  MAINTAINERS                                        |  6 ++
>  drivers/soc/qcom/Kconfig                           |  7 ++
>  drivers/soc/qcom/Makefile                          |  1 +
>  drivers/soc/qcom/boot_stats.c                      | 95 ++++++++++++++++++++++
>  5 files changed, 130 insertions(+)
>  create mode 100644 drivers/soc/qcom/boot_stats.c
> 
> -- 
> 2.7.4
>