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Date: Tue, 12 Sep 2017 12:27:56 -0600
From: Alex Williamson <alex.williamson@redhat.com>
To: valmiki <valmikibow@gmail.com>
Cc: iommu@lists.linux-foundation.org, kvm@vger.kernel.org,
        linux-pci <linux-pci@vger.kernel.org>,
        Jean-Philippe Brucker <jean-philippe.brucker@arm.com>,
        kevin.tian@intel.com, Auger Eric <eric.auger@redhat.com>
Subject: Re: VFIO on ARM64
Message-ID: <20170912122756.2eb29bb2@t450s.home>
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[Cc +Eric Auger]

On Tue, 12 Sep 2017 23:31:00 +0530
valmiki <valmikibow@gmail.com> wrote:

> Hi, as per VFIO documentation i see that we need to see 
> "/sys/bus/pci/devices/0000:06:0d.0/iommu_group" in order to find group 
> in which PCI bus is attached.
> But as per drivers/pci/pci-sysfs.c in static struct attribute 
> *pci_dev_attrs[], i don't see any such attribute.
> I tried enabling SMMUv2 driver and SMMU for PCIe node on our SOC, but 
> this file doesn't show up and also in /sys/kernel/iommu_group i do not 
> see "/sys/kernel/iommu_groups/17/devices/0000:00:1f.00" file, i see only 
> PCIe root port device tree node in that group and not individual buses.
> So on ARM64 for showing these paths i.e show specific to each bus, does 
> SMMU need any particular confguration (we have SMMUv2) ?
> Do we need any specific kernel configuration ?
> 
> 
> Regards,
> Valmiki