linux-kernel - Re: [PATCH v6 05/15] swiotlb: Add a new get_io_tlb

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Message-ID: <CALiNf2_7mHuMG5DTQD0GsriN=vuX0ytyUn4rxEmsK2iP3PKV+w@mail.gmail.com>
Date:   Wed, 12 May 2021 00:42:22 +0800
From:   Claire Chang <tientzu@...omium.org>
To:     Christoph Hellwig <hch@....de>
Cc:     Rob Herring <robh+dt@...nel.org>, mpe@...erman.id.au,
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Subject: Re: [PATCH v6 05/15] swiotlb: Add a new get_io_tlb_mem getter

On Mon, May 10, 2021 at 11:03 PM Christoph Hellwig <hch@....de> wrote:
>
> > +static inline struct io_tlb_mem *get_io_tlb_mem(struct device *dev)
> > +{
> > +#ifdef CONFIG_DMA_RESTRICTED_POOL
> > +     if (dev && dev->dma_io_tlb_mem)
> > +             return dev->dma_io_tlb_mem;
> > +#endif /* CONFIG_DMA_RESTRICTED_POOL */
> > +
> > +     return io_tlb_default_mem;
>
> Given that we're also looking into a not addressing restricted pool
> I'd rather always assign the active pool to dev->dma_io_tlb_mem and
> do away with this helper.

Where do you think is the proper place to do the assignment? First
time calling swiotlb_map? or in of_dma_configure_id?