iommu/dma: Use fast DMA domain lookup
Most parts of iommu-dma already assume they are operating on a default domain set up by iommu_dma_init_domain(), and can be converted straight over to avoid the refcounting bottleneck. MSI page mappings may be in an unmanaged domain with an explicit MSI-only cookie, so retain the non-specific lookup, but that's OK since they're far from a contended fast path either way. Signed-off-by: NRobin Murphy <robin.murphy@arm.com> Tested-by: NWill Deacon <will.deacon@arm.com> Signed-off-by: NJoerg Roedel <jroedel@suse.de>
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