linux-kernel - Re: [PATCH v2 7/7] iommu/vt-d: Remove lazy allocation of domains

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Date:   Thu, 14 Mar 2019 16:35:01 -0700
From:   Jacob Pan <jacob.jun.pan@...ux.intel.com>
To:     James Sewart <jamessewart@...sta.com>
Cc:     iommu@...ts.linux-foundation.org, Tom Murphy <tmurphy@...sta.com>,
        Dmitry Safonov <dima@...sta.com>, linux-kernel@...r.kernel.org,
        Lu Baolu <baolu.lu@...ux.intel.com>,
        jacob.jun.pan@...ux.intel.com
Subject: Re: [PATCH v2 7/7] iommu/vt-d: Remove lazy allocation of domains

On Thu, 14 Mar 2019 11:59:36 +0000
James Sewart <jamessewart@...sta.com> wrote:

>  
> -	domain = get_valid_domain_for_dev(dev);
> +	domain = find_domain(dev);
>  	if (!domain)
>  		return DMA_MAPPING_ERROR;
>  
> @@ -3914,7 +3624,7 @@ static int intel_map_sg(struct device *dev,
> struct scatterlist *sglist, int nele if (iommu_no_mapping(dev))
>  		return intel_nontranslate_map_sg(dev, sglist,
> nelems, dir); 
> -	domain = get_valid_domain_for_dev(dev);
> +	domain = find_domain(dev);
This patchset looks like a very good clean up, I am wondering why we
can't use the generic iommu_get_domain_for_dev() here, since VT-d has a
default DMA domain after your patch.