linux-kernel - Re: [PATCH 1/9] iommu: Introduce bind_pasid

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Date:   Wed, 28 Jun 2017 11:57:00 +0200
From:   Joerg Roedel <joro@...tes.org>
To:     Jacob Pan <jacob.jun.pan@...ux.intel.com>
Cc:     iommu@...ts.linux-foundation.org,
        LKML <linux-kernel@...r.kernel.org>,
        David Woodhouse <dwmw2@...radead.org>,
        "Liu, Yi L" <yi.l.liu@...el.com>,
        Lan Tianyu <tianyu.lan@...el.com>,
        "Tian, Kevin" <kevin.tian@...el.com>,
        Raj Ashok <ashok.raj@...el.com>,
        Alex Williamson <alex.williamson@...hat.com>,
        Jean Delvare <khali@...ux-fr.org>, Liu@...tes.org,
        Yi L <yi.l.liu@...ux.intel.com>
Subject: Re: [PATCH 1/9] iommu: Introduce bind_pasid_table API function

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