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Currently, the PCI config accessors are implemented based on device node.
Unfortunately, SRIOV VFs won't have the corresponding device nodes. pci_dn
will be used in replacement with device node for SRIOV VFs. So we have to
use pci_dn in PCI config accessors.
The patch refactors pci_dn in following aspects to make it ready to be used
in PCI config accessors as we do in subsequent patch:
* pci_dn is organized as a hierarchy tree. PCI device's pci_dn is
put to the child list of pci_dn of its upstream bridge or PHB. VF's
pci_dn will be put to the child list of pci_dn of PF's bridge.
* For one particular PCI device (VF or not), its pci_dn can be
found from pdev->dev.archdata.pci_data, PCI_DN(devnode), or
parent's list. The fast path (fetching pci_dn through PCI device
instance) is populated during early fixup time.
[bhelgaas: changelog]
Signed-off-by: Gavin Shan <gwshan@linux.vnet.ibm.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
cca87d303c