linux-kernel - Re: [PATCH RESEND 2/2] arm64: dts: rockchip: Add RGA2 support to rk356x

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Date:   Sat, 18 Feb 2023 00:01:19 +0800
From:   Shengyu Qu <wiagn233@...look.com>
To:     Michael Tretter <m.tretter@...gutronix.de>,
        devicetree@...r.kernel.org, ezequiel@...guardiasur.com.ar,
        frattaroli.nicolas@...il.com, heiko@...ech.de,
        jacob-chen@...wrt.com, krzysztof.kozlowski+dt@...aro.org,
        krzysztof.kozlowski@...aro.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-media@...r.kernel.org, linux-rockchip@...ts.infradead.org,
        mchehab@...nel.org, robh+dt@...nel.org, kernel@...gutronix.de
Subject: Re: [PATCH RESEND 2/2] arm64: dts: rockchip: Add RGA2 support to
 rk356x

Hi, Michael,

> I don't think the GFP_DMA32 flag works with DmaBuf import. The buffer may be
> allocated by some other driver that is able to address more than 4G and
> imported into the RGA driver. In this case, limiting the allocations is not
> enough, but we would still need error handling in the map function for buffers
> that cannot be addressed by the RGA.
>
> I guess we need both, a limit for the allocation and error checking for the
> map.

Maybe you are right.. I haven't digged into v4l2-m2m API, so I'm not 
sure about

it. Seems we need others' help.

Shengyu


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