linux-kernel - Re: [RFC 2/9] iommu/vt-d: add bind_pasid

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Date:   Fri, 23 Jun 2017 13:21:51 -0700
From:   Jacob Pan <jacob.jun.pan@...ux.intel.com>
To:     Alex Williamson <alex.williamson@...hat.com>
Cc:     iommu@...ts.linux-foundation.org,
        LKML <linux-kernel@...r.kernel.org>,
        Joerg Roedel <joro@...tes.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>,
        Jean Delvare <khali@...ux-fr.org>,
        Yi L <yi.l.liu@...ux.intel.com>, jacob.jun.pan@...ux.intel.com
Subject: Re: [RFC 2/9] iommu/vt-d: add bind_pasid_table function

On Fri, 23 Jun 2017 12:59:00 -0600
Alex Williamson <alex.williamson@...hat.com> wrote:

> On Fri, 23 Jun 2017 11:19:52 -0700
> Jacob Pan <jacob.jun.pan@...ux.intel.com> wrote:
> 
> > On Thu, 22 Jun 2017 16:52:15 -0600
> > Alex Williamson <alex.williamson@...hat.com> wrote:
> >   
> > > On Wed, 14 Jun 2017 15:22:56 -0700
> > > Jacob Pan <jacob.jun.pan@...ux.intel.com> wrote:  
> > > > +static int intel_iommu_unbind_pasid_table(struct iommu_domain
> > > > *domain,
> > > > +					struct device *dev)
> > > > +{
> > > > +	struct intel_iommu *iommu;
> > > > +	struct dmar_domain *dmar_domain =
> > > > to_dmar_domain(domain);
> > > > +	u8 bus, devfn;
> > > > +
> > > > +	iommu = device_to_iommu(dev, &bus, &devfn);
> > > > +	if (!iommu)
> > > > +		return -ENODEV;
> > > > +	/*
> > > > +	 * REVISIT: we might want to clear the PASID table
> > > > pointer
> > > > +	 * as part of context clear operation. Currently, it
> > > > leaves
> > > > +	 * stale data but should be ignored by hardware since
> > > > PASIDE
> > > > +	 * is clear.
> > > > +	 */
> > > > +	/* ATS will be reenabled when remapping is restored */
> > > > +	pci_disable_ats(to_pci_dev(dev));      
> > > 
> > > dev_is_pci()?
> > >     
> > good to check, even thought intel iommu supports PCI only.  
> 
> That's not true, intel-iommu supports non-PCI devices defined in ACPI
> as well.  Thanks,
> 
For non-pci device, there is still a pci BDF allocated for it (shown in
ACPI) such that it can have its own IOMMU context, right? e.g. HPET

> Alex

[Jacob Pan]