linux-kernel - Re: [PATCH v3 03/11] iommu/mediatek: Improve comment for the current region/bank

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Date:   Tue, 14 Feb 2023 10:48:46 +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 03/11] iommu/mediatek: Improve comment for the current
 region/bank

Il 14/02/23 04:11, Yong Wu ha scritto:
> No functional change. Just add more comment about the current region/bank
> in the code.
> 
> Signed-off-by: Yong Wu <yong.wu@...iatek.com>
> ---
>   drivers/iommu/mtk_iommu.c | 31 ++++++++++++++++++++++++++-----
>   1 file changed, 26 insertions(+), 5 deletions(-)
> 
> diff --git a/drivers/iommu/mtk_iommu.c b/drivers/iommu/mtk_iommu.c
> index d5a4955910ff..ab53edcb221f 100644
> --- a/drivers/iommu/mtk_iommu.c
> +++ b/drivers/iommu/mtk_iommu.c
> @@ -197,12 +197,33 @@ struct mtk_iommu_plat_data {
>   
>   	char			*pericfg_comp_str;
>   	struct list_head	*hw_list;
> -	unsigned int		iova_region_nr;
> -	const struct mtk_iommu_iova_region	*iova_region;
>   
> -	u8                  banks_num;
> -	bool                banks_enable[MTK_IOMMU_BANK_MAX];
> -	unsigned int        banks_portmsk[MTK_IOMMU_BANK_MAX];
> +	/*
> +	 * The IOMMU HW may support 16GB iova. In order to balance the IOVA ranges,
> +	 * different masters will be put in different iova ranges, for example vcodec
> +	 * is in 4G-8G and cam is in 8G-12G. Meanwhile, some masters may have the
> +	 * special IOVA range requirement, like CCU can only support the address
> +	 * 0x40000000-0x44000000.
> +	 * Here list the iova ranges this SoC supports and which larbs/ports are in
> +	 * which region.
> +	 *
> +	 * 16GB iova all use one pgtable, but each a region is a iommu group.
> +	 */
> +	struct {
> +		unsigned int	iova_region_nr;
> +		const struct mtk_iommu_iova_region	*iova_region;
> +	};
> +
> +	/*
> +	 * The IOMMU HW may have 5 banks. Each bank has a indenpendent pgtable.

You got a typo here: `inde*n*pendent` - after fixing that:

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