linux-kernel - Re: [PATCH v2] iommu: Improve the performance for direct

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Date:   Mon,  7 Dec 2020 11:05:24 +0000
From:   Will Deacon <will@...nel.org>
To:     Yong Wu <yong.wu@...iatek.com>,
        Robin Murphy <robin.murphy@....com>,
        Joerg Roedel <joro@...tes.org>
Cc:     catalin.marinas@....com, kernel-team@...roid.com,
        Will Deacon <will@...nel.org>, srv_heupstream@...iatek.com,
        linux-arm-kernel@...ts.infradead.org, youlin.pei@...iatek.com,
        chao.hao@...iatek.com, anan.sun@...iatek.com,
        iommu@...ts.linux-foundation.org, linux-kernel@...r.kernel.org,
        linux-mediatek@...ts.infradead.org,
        Nicolas Boichat <drinkcat@...omium.org>,
        Tomasz Figa <tfiga@...gle.com>,
        Krzysztof Kozlowski <krzk@...nel.org>,
        Matthias Brugger <matthias.bgg@...il.com>
Subject: Re: [PATCH v2] iommu: Improve the performance for direct_mapping

On Mon, 7 Dec 2020 17:35:53 +0800, Yong Wu wrote:
> Currently direct_mapping always use the smallest pgsize which is SZ_4K
> normally to mapping. This is unnecessary. we could gather the size, and
> call iommu_map then, iommu_map could decide how to map better with the
> just right pgsize.
> 
> >From the original comment, we should take care overlap, otherwise,
> iommu_map may return -EEXIST. In this overlap case, we should map the
> previous region before overlap firstly. then map the left part.
> 
> [...]

Applied to arm64 (for-next/iommu/misc), thanks!

[1/1] iommu: Improve the performance for direct_mapping
      https://git.kernel.org/arm64/c/093b32a849b3

Cheers,
-- 
Will

https://fixes.arm64.dev
https://next.arm64.dev
https://will.arm64.dev