linux-kernel - Re: [PATCH v3 05/11] iommu/mediatek: mt8195: Add iova_region_larb

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Date:   Tue, 14 Feb 2023 10:36:11 +0100
From:   AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>
To:     Yong Wu <yong.wu@...iatek.com>, Joerg Roedel <joro@...tes.org>,
        Matthias Brugger <matthias.bgg@...il.com>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Rob Herring <robh+dt@...nel.org>
Cc:     Will Deacon <will@...nel.org>, Robin Murphy <robin.murphy@....com>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Hans Verkuil <hverkuil@...all.nl>, nfraprado@...labora.com,
        linux-media@...r.kernel.org, devicetree@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org, linux-kernel@...r.kernel.org,
        iommu@...ts.linux.dev, mingyuan.ma@...iatek.com,
        yf.wang@...iatek.com, jianjiao.zeng@...iatek.com,
        Yunfei Dong <yunfei.dong@...iatek.com>,
        kyrie wu <kyrie.wu@...iatek.corp-partner.google.com>,
        chengci.xu@...iatek.com, youlin.pei@...iatek.com,
        anan.sun@...iatek.com
Subject: Re: [PATCH v3 05/11] iommu/mediatek: mt8195: Add iova_region_larb_msk

Il 14/02/23 04:11, Yong Wu ha scritto:
> Add iova_region_larb_msk for mt8195. We separate the 16GB iova regions
> by each device's larbid/portid.
> Refer to include/dt-bindings/memory/mt8195-memory-port.h
> 
> Define a new macro MT8192_MULTI_REGION_MAX_NR to indicate
> the index of mt8xxx_larb_region_msk and
> "struct mtk_iommu_iova_region mt8192_multi_dom"
> are the same.
> 
> Signed-off-by: Yong Wu <yong.wu@...iatek.com>

Sorry but... you *are* introducing a iova_region_larb_msk for MT8192 later,
while you're introducing definitions containing the `MT8192` name in a commit
that introduces the same but for MT8195.

I strongly suggest to, at this point, introduce MT8192 region mask here, along
with the MT8192 definitions, and MT8195 after that :-)


Regards,
Angelo