linux-kernel - Re: [PATCH V5 RESEND 2/3] iommu/hisilicon: Add hi6220-SoC smmu driver

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Date:	Fri, 27 Nov 2015 13:02:03 +0100
From:	Joerg Roedel <joro@...tes.org>
To:	Chen Feng <puck.chen@...ilicon.com>
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 2/3] iommu/hisilicon: Add hi6220-SoC smmu driver

On Fri, Nov 20, 2015 at 10:25:08AM +0800, Chen Feng wrote:
> +config HI6220_IOMMU
> +	bool "Hi6220 IOMMU Support"
> +	depends on ARM64
> +	select IOMMU_API
> +	select IOMMU_IOVA
> +	help
> +	  Enable IOMMU Driver for hi6220 SoC. The IOMMU API and IOMMU IOVA
> +	  is also selected.

The last sentence is of little help for the user. Better put the reasons
in here when a user should select this option.

> +	/*set axi id*/

Coding style nit: Please write these oneline comments with spaces, like
this:

	/* set axi id */

> +static int hi6220_smmu_attach_dev(struct iommu_domain *domain,
> +				  struct device *dev)
> +{
> +	dev->archdata.iommu = &iova_allocator;
> +
> +	return 0;
> +}
> +
> +static void hi6220_smmu_detach_dev(struct iommu_domain *domain,
> +				   struct device *dev)
> +{
> +	dev->archdata.iommu = NULL;
> +}

This basically means that this driver only supports one domain, right?
That is not compatible with the iommu-api requirements.

You need to create an iommu-group per smmu in your system and put all
devices translated by this smmu in that group. And then you must change
your code to allow attaching/detaching this iommu-group to different
domains.


	Joerg

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