linux-kernel - Re: [PATCH v2 3/8] iommu/vt-d: Implement device

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Date:   Wed, 16 Mar 2022 13:51:31 -0700
From:   Jacob Pan <jacob.jun.pan@...ux.intel.com>
To:     "Tian, Kevin" <kevin.tian@...el.com>
Cc:     "iommu@...ts.linux-foundation.org" <iommu@...ts.linux-foundation.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Joerg Roedel <joro@...tes.org>,
        "Jason Gunthorpe" <jgg@...dia.com>,
        Christoph Hellwig <hch@...radead.org>,
        Lu Baolu <baolu.lu@...ux.intel.com>,
        Jean-Philippe Brucker <jean-philippe@...aro.com>,
        "Pan, Jacob jun" <jacob.jun.pan@...el.com>,
        "Raj, Ashok" <ashok.raj@...el.com>,
        "Kumar, Sanjay K" <sanjay.k.kumar@...el.com>,
        "Jiang, Dave" <dave.jiang@...el.com>,
        "Luck, Tony" <tony.luck@...el.com>,
        "Zanussi, Tom" <tom.zanussi@...el.com>,
        "Williams, Dan J" <dan.j.williams@...el.com>,
        "Liu, Yi L" <yi.l.liu@...el.com>, jacob.jun.pan@...ux.intel.com
Subject: Re: [PATCH v2 3/8] iommu/vt-d: Implement device_pasid domain attach
 ops

Hi Kevin,

On Wed, 16 Mar 2022 07:39:09 +0000, "Tian, Kevin" <kevin.tian@...el.com>
wrote:

> > From: Jacob Pan <jacob.jun.pan@...ux.intel.com>
> > Sent: Tuesday, March 15, 2022 1:07 PM
> > +static int intel_iommu_attach_dev_pasid(struct iommu_domain *domain,
> > +					struct device *dev, ioasid_t
> > pasid) +{
> > +	struct dmar_domain *dmar_domain = to_dmar_domain(domain);
> > +	struct device_domain_info *info = get_domain_info(dev);
> > +	struct intel_iommu *iommu = info->iommu;
> > +	struct pasid_info *pinfo;
> > +	unsigned long flags;
> > +	int ret = 0;
> > +	void *entry;
> > +
> > +	if (!info)
> > +		return -ENODEV;  
> 
> btw this interface only works in scalable mode. Lack of a check to
> return error on legacy mode here.
> 
right, legacy mode has no PASIDs. will check

Thanks,

Jacob