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

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Message-ID: <76e35340-32c3-ee0d-5232-bd8800248402@linux.intel.com>
Date:   Tue, 23 Apr 2019 10:03:28 +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 12:47 AM, Christoph Hellwig wrote:
> On Sun, Apr 21, 2019 at 09:17:17AM +0800, Lu Baolu wrote:
>> +static inline bool device_needs_bounce(struct device *dev)
>> +{
>> +	struct pci_dev *pdev = NULL;
>> +
>> +	if (intel_no_bounce)
>> +		return false;
>> +
>> +	if (dev_is_pci(dev))
>> +		pdev = to_pci_dev(dev);
>> +
>> +	return pdev ? pdev->untrusted : false;
>> +}
> 
> 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. Or any other thought?

Best regards,
Lu Baolu