iommu/iova: Move flush queue code to iommu-dma
Flush queues are specific to DMA ops, which are now handled exclusively by iommu-dma. As such, now that the historical artefacts from being shared directly with drivers have been cleaned up, move the flush queue code into iommu-dma itself to get it out of the way of other IOVA users. This is pure code movement with no functional change; refactoring to clean up the headers and definitions will follow. Reviewed-by: John Garry <john.garry@huawei.com> Signed-off-by: Robin Murphy <robin.murphy@arm.com> Link: https://lore.kernel.org/r/1d9a1ee1392e96eaae5e6467181b3e83edfdfbad.1639753638.git.robin.murphy@arm.com Signed-off-by: Joerg Roedel <jroedel@suse.de>
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