Date: Wed, 22 May 2024 15:48:00 -0700
From: Bjorn Andersson <quic_bjorande@...cinc.com>
To: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
CC: Kalle Valo <kvalo@...nel.org>, <neil.armstrong@...aro.org>,
        Bjorn
 Andersson <andersson@...nel.org>,
        Konrad Dybcio <konrad.dybcio@...aro.org>,
        Loic Poulain <loic.poulain@...aro.org>,
        Mathieu Poirier
	<mathieu.poirier@...aro.org>,
        Rob Herring <robh@...nel.org>,
        Krzysztof
 Kozlowski <krzk+dt@...nel.org>,
        Conor Dooley <conor+dt@...nel.org>, <linux-kernel@...r.kernel.org>,
        <linux-arm-msm@...r.kernel.org>, <wcn36xx@...ts.infradead.org>,
        <linux-wireless@...r.kernel.org>, <linux-remoteproc@...r.kernel.org>,
        <devicetree@...r.kernel.org>, Arnd
 Bergmann <arnd@...db.de>
Subject: Re: [PATCH 01/12] soc: qcom: add firmware name helper

On Tue, May 21, 2024 at 03:08:31PM +0200, Dmitry Baryshkov wrote:
> On Tue, 21 May 2024 at 13:20, Kalle Valo <kvalo@...nel.org> wrote:
> >
> > Dmitry Baryshkov <dmitry.baryshkov@...aro.org> writes:
> >
> > > On Tue, 21 May 2024 at 12:52, <neil.armstrong@...aro.org> wrote:
> > >>
> > >> On 21/05/2024 11:45, Dmitry Baryshkov wrote:
> > >> > Qualcomm platforms have different sets of the firmware files, which
> > >> > differ from platform to platform (and from board to board, due to the
> > >> > embedded signatures). Rather than listing all the firmware files,
> > >> > including full paths, in the DT, provide a way to determine firmware
> > >> > path based on the root DT node compatible.
> > >>
> > >> Ok this looks quite over-engineered but necessary to handle the legacy,
> > >> but I really think we should add a way to look for a board-specific path
> > >> first and fallback to those SoC specific paths.
> > >
> > > Again, CONFIG_FW_LOADER_USER_HELPER => delays.
> >
> > To me this also looks like very over-engineered, can you elaborate more
> > why this is needed? Concrete examples would help to understand better.
> 
> Sure. During the meeting last week Arnd suggested evaluating if we can
> drop firmware-name from the board DT files. Several reasons for that:
> - DT should describe the hardware, not the Linux-firmware locations
> - having firmware name in DT complicates updating the tree to use
> different firmware API (think of mbn vs mdt vs any other format)
> - If the DT gets supplied by the vendor (e.g. for
> SystemReady-certified devices), there should be a sync between the
> vendor's DT, linux kernel and the rootfs. Dropping firmware names from
> DT solves that by removing one piece of the equation
> 
> Now for the complexity of the solution. Each SoC family has their own
> firmware set. This includes firmware for the DSPs, for modem, WiFi
> bits, GPU shader, etc.
> For the development boards these devices are signed by the testing key
> and the actual signature is not validated against the root of trust
> certificate.
> For the end-user devices the signature is actually validated against
> the bits fused to the SoC during manufacturing process. CA certificate
> (and thus the fuses) differ from vendor to vendor (and from the device
> to device)
> 
> Not all of the firmware files are a part of the public linux-firmware
> tree. However we need to support the rootfs bundled with the firmware
> for different platforms (both public and vendor). The non-signed files
> come from the Adreno GPU and can be shared between platforms. All
> other files are SoC-specific and in some cases device-specific.
> 
> So for example the SDM845 db845c (open device) loads following firmware files:
> Not signed:
> - qcom/a630_sqe.fw
> - qcom/a630_gmu.bin
> 
> Signed, will work for any non-secured sdm845 device:
> - qcom/sdm845/a630_zap.mbn
> - qcom/sdm845/adsp.mbn
> - qcom/sdm845/cdsp.mbn
> - qcom/sdm485/mba.mbn
> - qcom/sdm845/modem.mbn
> - qcom/sdm845/wlanmdsp.mbn (loaded via TQFTP)
> - qcom/venus-5.2/venus.mbn
> 
> Signed, works only for DB845c.
> - qcom/sdm845/Thundercomm/db845c/slpi.mbn
> 
> In comparison, the SDM845 Pixel-3 phone (aka blueline) should load the
> following firmware files:
> - qcom/a630_sqe.fw (the same, non-signed file)
> - qcom/a630_gmu.bin (the same, non-signed file)
> - qcom/sdm845/Google/blueline/a630_zap.mbn

How do you get from "a630_zap.mbn" to this? By extending the lookup
table for every target, or what am I missing?

Regards,
Bjorn

> - qcom/sdm845/Google/blueline/adsp.mbn
> - qcom/sdm845/Google/blueline/cdsp.mbn
> - qcom/sdm845/Google/blueline/ipa_fws.mbn
> - qcom/sdm845/Google/blueline/mba.mbn
> - qcom/sdm845/Google/blueline/modem.mbn
> - qcom/sdm845/Google/blueline/venus.mbn
> - qcom/sdm845/Google/blueline/wlanmdsp.mbn
> - qcom/sdm845/Google/blueline/slpi.mbn
> 
> The Lenovo Yoga C630 WoS laptop (SDM850 is a variant of SDM845) uses
> another set of files:
> - qcom/a630_sqe.fw (the same, non-signed file)
> - qcom/a630_gmu.bin (the same, non-signed file)
> - qcom/sdm850/LENOVO/81JL/qcdxkmsuc850.mbn
> - qcom/sdm850/LENOVO/81JL/qcadsp850.mbn
> - qcom/sdm850/LENOVO/81JL/qccdsp850.mbn
> - qcom/sdm850/LENOVO/81JL/ipa_fws.elf
> - qcom/sdm850/LENOVO/81JL/qcdsp1v2850.mbn
> - qcom/sdm850/LENOVO/81JL/qcdsp2850.mbn
> - qcom/sdm850/LENOVO/81JL/qcvss850.mbn
> - qcom/sdm850/LENOVO/81JL/wlanmdsp.mbn
> - qcom/sdm850/LENOVO/81JL/qcslpi850.mbn
> 
> If we look at one of the recent platforms, e.g. SM8650-QRD, this list
> also grows up:
> - qcom/gen70900_sqe.fw (generic, non-signed)
> - qcom/gmu_gen70900.bin (generic, non-signed)
> - qcom/sm8650/gen70900_zap.mbn
> - qcom/sm8650/adsp.mbn
> - qcom/sm8650/adsp_dtb.mbn
> - qcom/sm8650/cdsp.mbn
> - qcom/sm8650/cdsp_dtb.mbn
> - qcom/sm8650/ipa_fws.mbn
> - qcom/sm8650/modem.mbn
> - qcom/sm8650/modem_dtb.mbn
> - qcom/sm8650/vpu33_4v.mbn (or maybe qcom/vpu-33/vpu_4v.mbn)
> 
> -- 
> With best wishes
> Dmitry
> 
> 
> 
> 
> 
> 
> 
> 
> 

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