linux-kernel - Re: [PATCH V5 RESEND 0/3] Add iommu support for hi6220 HiKey board

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Message-ID: <56590CC3.5050401@hisilicon.com>
Date:	Sat, 28 Nov 2015 10:09:07 +0800
From:	chenfeng <puck.chen@...ilicon.com>
To:	Joerg Roedel <joro@...tes.org>
CC:	<iommu@...ts.linux-foundation.org>, <linux-kernel@...r.kernel.org>,
	<robh+dt@...nel.org>, <pawel.moll@....com>, <mark.rutland@....com>,
	<ijc+devicetree@...lion.org.uk>, <devicetree@...r.kernel.org>,
	<puck.chen@...yun.com>, <w.f@...wei.com>, <xuwei5@...ilicon.com>,
	<guodong.xu@...aro.org>, <arnd@...aro.org>,
	<haojian.zhuang@...aro.org>
Subject: Re: [PATCH V5 RESEND 0/3] Add iommu support for hi6220 HiKey board



On 2015/11/27 19:49, Joerg Roedel wrote:
> On Fri, Nov 20, 2015 at 10:25:06AM +0800, Chen Feng wrote:
>> eg:
>> struct iommu_domain *domain = iommu_domain_alloc(bus);
>> iommu_attach_device(domain, dev);
>> struct iova_domain *iovad = (struct iova_domain *)m_dev->archdata.iommu;
>> struct iova * t_iova = alloc_iova(iovad, size, limit_pfn, align);
>> iommu_map(domain, t_iova->pfn_lo << 12, phy_addr, size, port);
> 
> Any reason the media subsystem should use the iommu-api directly, and
> not the dma-api? You can make your iommu available by adapting the
> common dma-iommu implementation from Robin Murphy to your iommu to make
> it usable through the dma-api.
> 

ok, I will change this to dma-api. Since v1 version, the dma-api was not ok for arm64.
I will do this with dma-api function.
> 
> 	Joerg
> 
> 
> .
> 

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