linux-kernel - Re: [PATCH v3 08/10] iommu/vt-d: Check whether device requires bounce buffer

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Date:   Tue, 23 Apr 2019 15:35:51 +0800
From:   Lu Baolu <baolu.lu@...ux.intel.com>
To:     Christoph Hellwig <hch@....de>
Cc:     baolu.lu@...ux.intel.com, David Woodhouse <dwmw2@...radead.org>,
        Joerg Roedel <joro@...tes.org>, ashok.raj@...el.com,
        jacob.jun.pan@...el.com, alan.cox@...el.com, kevin.tian@...el.com,
        mika.westerberg@...ux.intel.com, pengfei.xu@...el.com,
        Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
        Marek Szyprowski <m.szyprowski@...sung.com>,
        Robin Murphy <robin.murphy@....com>,
        iommu@...ts.linux-foundation.org, linux-kernel@...r.kernel.org,
        Jacob Pan <jacob.jun.pan@...ux.intel.com>
Subject: Re: [PATCH v3 08/10] iommu/vt-d: Check whether device requires bounce
 buffer

Hi,

On 4/23/19 2:08 PM, Christoph Hellwig wrote:
>>> Again, this and the option should not be in a specific iommu driver.
>>>
>>
>> The option of whether bounce is ignored should be in the specific iommu
>> driver.
> 
> Why?  As a user I could not care less which IOMMU driver my particular
> system uses.
> 

Looks reasonable to me. Let's listen to more opinions.

Best regards,
Lu Baolu