linux-kernel - Re: [PATCH V2 2/3] Add iommu driver for hi6220 SoC platform

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Message-ID: <5629F987.3060701@hisilicon.com>
Date:	Fri, 23 Oct 2015 17:10:31 +0800
From:	chenfeng <puck.chen@...ilicon.com>
To:	Robin Murphy <robin.murphy@....com>, <yudongbin@...ilicon.com>,
	<saberlily.xia@...ilicon.com>, <suzhuangluan@...ilicon.com>,
	<kong.kongxinwei@...ilicon.com>, <xuyiping@...ilicon.com>,
	<z.liuxinliang@...ilicon.com>, <puck.chen@...yun.com>,
	<weidong2@...ilicon.com>, <w.f@...wei.com>, <joro@...tes.org>,
	<robh+dt@...nel.org>, <pawel.moll@....com>, <mark.rutland@....com>,
	<ijc+devicetree@...lion.org.uk>, <galak@...eaurora.org>,
	<linux-kernel@...r.kernel.org>, <xuwei5@...ilicon.com>,
	<devicetree@...r.kernel.org>,
	<linux-arm-kernel@...ts.infradead.org>
CC:	<dan.zhao@...ilicon.com>, <peter.panshilin@...ilicon.com>,
	<qijiwen@...ilicon.com>, <linuxarm@...wei.com>
Subject: Re: [PATCH V2 2/3] Add iommu driver for hi6220 SoC platform

Hi Robin,

On 2015/10/20 23:02, Robin Murphy wrote:
> On 20/10/15 09:45, Chen Feng wrote:
>> iommu/hisilicon: Add hi6220-SoC smmu driver
> 

>> +
>> +static int hi6220_smmu_attach_dev(struct iommu_domain *domain,
>> +                  struct device *dev)
>> +{
>> +    dev->archdata.iommu = &iova_allocator;
> 
> If the hardware doesn't offer any kind of device isolation (i.e. multiple translation contexts), then you should probably have more logic here to ensure only a single domain can ever be active at once.
> 
>> +    return 0;
>> +}
>> +
I feel confused about your above comments. Could you help explain "ensure only a single domain can ever be active at once"?


> Robin.
> 
> 
> .
> 

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