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 19:40:57 +0800
From:   Lu Baolu <baolu.lu@...ux.intel.com>
To:     Christoph Hellwig <hch@...radead.org>
Cc:     baolu.lu@...ux.intel.com, Joerg Roedel <joro@...tes.org>,
        Will Deacon <will@...nel.org>, Tom Murphy <murphyt7@....ie>,
        David Woodhouse <dwmw2@...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

Hi Christoph,

On 2020/11/23 18:08, Christoph Hellwig wrote:
>> +	/*
>> +	 * 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.
> 

Yes. But Will's iommu/next branch is based on 5.10-rc3. I synced with
him, we agreed to keep it 5.10-rc3 and resolve this conflict when
merging it.

Best regards,
baolu