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Devices supporting Process Address Space Identifiers (PASIDs) can use an IOMMU to access multiple IO address spaces at the same time. A PCIe device indicates support for this feature by implementing the PASID capability. This patch adds support for the capability to the Linux kernel. Reviewed-by: Bjorn Helgaas <bhelgaas@google.com> Signed-off-by: Joerg Roedel <joerg.roedel@amd.com> Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>