linux-kernel - Re: [PATCH v7 05/15] swiotlb: Add a new get_io_tlb

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Message-ID: <CALiNf28=fn5r_O8ET0TNM6cS7WO0mwXiMzR5z=eJXmNKFWKdzA@mail.gmail.com>
Date:   Tue, 25 May 2021 11:08:34 +0800
From:   Claire Chang <tientzu@...omium.org>
To:     Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
Cc:     Rob Herring <robh+dt@...nel.org>, mpe@...erman.id.au,
        Joerg Roedel <joro@...tes.org>, Will Deacon <will@...nel.org>,
        Frank Rowand <frowand.list@...il.com>,
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        Christoph Hellwig <hch@....de>,
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        benh@...nel.crashing.org, paulus@...ba.org,
        "list@....net:IOMMU DRIVERS" <iommu@...ts.linux-foundation.org>,
        sstabellini@...nel.org, Robin Murphy <robin.murphy@....com>,
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        Saravana Kannan <saravanak@...gle.com>,
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Subject: Re: [PATCH v7 05/15] swiotlb: Add a new get_io_tlb_mem getter

On Mon, May 24, 2021 at 11:51 PM Konrad Rzeszutek Wilk
<konrad.wilk@...cle.com> wrote:
>
> On Tue, May 18, 2021 at 02:51:52PM +0800, Claire Chang wrote:
> > Still keep this function because directly using dev->dma_io_tlb_mem
> > will cause issues for memory allocation for existing devices. The pool
> > can't support atomic coherent allocation so we need to distinguish the
> > per device pool and the default pool in swiotlb_alloc.
>
> This above should really be rolled in the commit. You can prefix it by
> "The reason it was done this way was because directly using .."
>

Will add it.