Subject: Re: [PATCH v3 05/33] iommu/mediatek: Adapt sharing and non-sharing
 pgtable case
To:     Yong Wu <yong.wu@mediatek.com>, Joerg Roedel <joro@8bytes.org>,
        Rob Herring <robh+dt@kernel.org>,
        Matthias Brugger <matthias.bgg@gmail.com>,
        Will Deacon <will@kernel.org>,
        Robin Murphy <robin.murphy@arm.com>
Cc:     Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com>,
        Tomasz Figa <tfiga@chromium.org>,
        linux-mediatek@lists.infradead.org, srv_heupstream@mediatek.com,
        devicetree@vger.kernel.org, linux-kernel@vger.kernel.org,
        linux-arm-kernel@lists.infradead.org,
        iommu@lists.linux-foundation.org,
        Hsin-Yi Wang <hsinyi@chromium.org>, youlin.pei@mediatek.com,
        anan.sun@mediatek.com, chao.hao@mediatek.com,
        yen-chang.chen@mediatek.com
References: <20210923115840.17813-1-yong.wu@mediatek.com>
 <20210923115840.17813-6-yong.wu@mediatek.com>
From:   AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@collabora.com>
Message-ID: <06b124b3-fadc-da03-648f-907c622e2272@collabora.com>
Date:   Tue, 4 Jan 2022 16:55:42 +0100
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Il 23/09/21 13:58, Yong Wu ha scritto:
> In previous mt2712, Both IOMMUs are MM IOMMU, and they will share pgtable.
> However in the latest SoC, another is infra IOMMU, there is no reason to
> share pgtable between MM with INFRA IOMMU. This patch manage to
> implement the two case(sharing and non-sharing pgtable).
> 
> Currently we use for_each_m4u to loop the 2 HWs. Add the list_head into
> this macro.
> In the sharing pgtable case, the list_head is the global "m4ulist".
> In the non-sharing pgtable case, the list_head is hw_list_head which is a
> variable in the "data". then for_each_m4u will only loop itself.
> 
> Signed-off-by: Yong Wu <yong.wu@mediatek.com>

Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>