On 08/22/2011 01:46 PM, Joerg Roedel wrote:
> $ readlink /sys/devices/pci0000:00/0000:00:19.0/iommu_group > ../../../path/to/device/which/represents/the/resource/constraint > > (the pci-to-pci bridge on x86, or whatever node represents partitionable > endpoints on power) That does not work. The bridge in question may not even be visible as a PCI device, so you can't link to it. This is the case on a few PCIe cards which only have a PCIx chip and a PCIe-2-PCIx bridge to implement the PCIe interface (yes, I have seen those cards).
How does the kernel detect that devices behind the invisible bridge must be assigned as a unit?
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