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

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Date:   Mon, 10 May 2021 17:03:42 +0200
From:   Christoph Hellwig <hch@....de>
To:     Claire Chang <tientzu@...omium.org>
Cc:     Rob Herring <robh+dt@...nel.org>, mpe@...erman.id.au,
        Joerg Roedel <joro@...tes.org>, Will Deacon <will@...nel.org>,
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        Christoph Hellwig <hch@....de>,
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        benh@...nel.crashing.org, paulus@...ba.org,
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Subject: Re: [PATCH v6 05/15] swiotlb: Add a new get_io_tlb_mem getter

> +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.