From mboxrd@z Thu Jan  1 00:00:00 1970
From: Joerg Roedel <joro-zLv9SwRftAIdnm+yROfE0A@public.gmane.org>
Subject: Re: [PATCH 1/9] iommu: Introduce bind_pasid_table API function
Date: Wed, 28 Jun 2017 11:57:00 +0200
Message-ID: <20170628095700.GE14532@8bytes.org>
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To: Jacob Pan <jacob.jun.pan-VuQAYsv1563Yd54FQh9/CA@public.gmane.org>
Cc: Lan Tianyu <tianyu.lan-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org>, Liu-zLv9SwRftAIdnm+yROfE0A@public.gmane.org, "Tian,
	Kevin" <kevin.tian-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org>, Yi L <yi.l.liu-VuQAYsv1563Yd54FQh9/CA@public.gmane.org>, LKML <linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>, iommu-cunTk1MwBs9QetFLy7KEm3xJsTq8ys+cHZ5vskTnxNA@public.gmane.org, Jean Delvare <khali-PUYAD+kWke1g9hUCZPvPmw@public.gmane.org>, David Woodhouse <dwmw2-wEGCiKHe2LqWVfeAwA7xHQ@public.gmane.org>
List-Id: iommu@lists.linux-foundation.org

On Tue, Jun 27, 2017 at 12:47:55PM -0700, Jacob Pan wrote:
> +int iommu_bind_pasid_table(struct iommu_domain *domain, struct device *dev,
> +			struct pasid_table_info *pasidt_binfo)
> +{
> +	if (unlikely(!domain->ops->bind_pasid_table))
> +		return -EINVAL;

I think its better to return -ENODEV here, like other iommu-api
functions do when a callback is NULL.

> +enum iommu_model {
> +	IOMMU_MODEL_INTEL_VTD,
> +	IOMMU_MODEL_ARM_SMMU,
> +};

AMD IOMMU also supports shared virtual memory.

Regards,

	Joerg