iommu/vt-d: Update to use PCI DMA aliases
VT-d code currently makes use of pci_find_upstream_pcie_bridge() in order to find the topology based alias of a device. This function has a few problems. First, it doesn't check the entire alias path of the device to the root bus, therefore if a PCIe device is masked upstream, the wrong result is produced. Also, it's known to get confused and give up when it crosses a bridge from a conventional PCI bus to a PCIe bus that lacks a PCIe capability. The PCI-core provided DMA alias support solves both of these problems and additionally adds support for DMA function quirks allowing VT-d to work with devices like Marvell and Ricoh with known broken requester IDs. Signed-off-by: NAlex Williamson <alex.williamson@redhat.com> Cc: David Woodhouse <dwmw2@infradead.org> Signed-off-by: NJoerg Roedel <jroedel@suse.de>
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