linux-kernel - Re: [PATCH V7 0/2] firmware: Add support for boot

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Message-ID: <ZKwhwUnKR7vqQZms@brian-x1>
Date:   Mon, 10 Jul 2023 11:20:33 -0400
From:   Brian Masney <bmasney@...hat.com>
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>,
        Bjorn Andersson <andersson@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Arnd Bergmann <arnd@...db.de>,
        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 V7 0/2] firmware: Add support for boot_stats

On Wed, Jul 05, 2023 at 11:02:30AM +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 by the bootloader and populated on
> the device tree properties "pre-abl-time" and "abl-time" which can be
> be viewed from the user space like as follows:-
> 
> /sys/firmware/devicetree/base/bootstats # cat abl_time
> 17898
> 
> As a part of this patch series added the bindings for boot-stats which
> was suggested in the v6 of the series. The link for the same is as
> follows:-

Should boot statistics be exposed to userspace through the qcom socinfo
driver? I see that the socinfo v19 metadata has fields for the boot core
and boot cluster [1], so boot timing wouldn't be out of place.

Brian

[1] https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/drivers/soc/qcom/socinfo.c#n572