linux-kernel - Re: [PATCH] iommu/mediatek: Fix share pgtable for iova over 4GB

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Date:   Fri, 22 Sep 2023 10:11:38 +0200
From:   AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>
To:     Yong Wu <yong.wu@...iatek.com>, Joerg Roedel <joro@...tes.org>,
        Will Deacon <will@...nel.org>,
        Matthias Brugger <matthias.bgg@...il.com>
Cc:     Robin Murphy <robin.murphy@....com>, iommu@...ts.linux.dev,
        linux-mediatek@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        Laura Nao <laura.nao@...labora.com>
Subject: Re: [PATCH] iommu/mediatek: Fix share pgtable for iova over 4GB

Il 19/08/23 10:14, Yong Wu ha scritto:
> In mt8192/mt8186, there is only one MM IOMMU that supports 16GB iova
> space, which is shared by display, vcodec and camera. These two SoC use
> one pgtable and have not the flag SHARE_PGTABLE, we should also keep
> share pgtable for this case.
> 
> In mtk_iommu_domain_finalise, MM IOMMU always share pgtable, thus remove
> the flag SHARE_PGTABLE checking. Infra IOMMU always uses independent
> pgtable.
> 
> Fixes: cf69ef46dbd9 ("iommu/mediatek: Fix two IOMMU share pagetable issue")
> Reported-by: Laura Nao <laura.nao@...labora.com>
> Closes: https://lore.kernel.org/linux-iommu/20230818154156.314742-1-laura.nao@collabora.com/
> Signed-off-by: Yong Wu <yong.wu@...iatek.com>
> ---
> Base on next-20230818.
> ---
>   drivers/iommu/mtk_iommu.c | 9 ++++-----
>   1 file changed, 4 insertions(+), 5 deletions(-)

Gentle ping for an important fix.

Thanks,
Angelo