linux-kernel - Re: [PATCH v5 3/7] iommu: Allow the dma-iommu api to use bounce buffers

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Date:   Mon, 23 Nov 2020 10:08:16 +0000
From:   Christoph Hellwig <hch@...radead.org>
To:     Lu Baolu <baolu.lu@...ux.intel.com>
Cc:     Joerg Roedel <joro@...tes.org>, Will Deacon <will@...nel.org>,
        Tom Murphy <murphyt7@....ie>,
        David Woodhouse <dwmw2@...radead.org>,
        Christoph Hellwig <hch@...radead.org>,
        Ashok Raj <ashok.raj@...el.com>,
        Tvrtko Ursulin <tvrtko.ursulin@...ux.intel.com>,
        iommu@...ts.linux-foundation.org, linux-kernel@...r.kernel.org,
        Logan Gunthorpe <logang@...tatee.com>
Subject: Re: [PATCH v5 3/7] iommu: Allow the dma-iommu api to use bounce
 buffers

> +	/*
> +	 * If both the physical buffer start address and size are
> +	 * page aligned, we don't need to use a bounce page.
> +	 */
> +	if (IS_ENABLED(CONFIG_SWIOTLB) && dev_is_untrusted(dev) &&
> +	    iova_offset(iovad, phys | org_size)) {
> +		aligned_size = iova_align(iovad, org_size);
> +		phys = swiotlb_tbl_map_single(dev,
> +				phys_to_dma(dev, io_tlb_start),
> +				phys, org_size, aligned_size, dir, attrs);

swiotlb_tbl_map_single takes one less argument in 5.10-rc now.