x86/amd-iommu: Add function to complete a tlb flush
This patch adds a function to the AMD IOMMU driver which
completes all queued commands an all IOMMUs a specific
domain has devices attached on. This is required in a later
patch when per-domain flushing is implemented.
Signed-off-by: NJoerg Roedel <joerg.roedel@amd.com>
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