iommu/amd: Fix unity mapping initialization race
There is a race condition in the AMD IOMMU init code that causes requested unity mappings to be blocked by the IOMMU for a short period of time. This results on boot failures and IO_PAGE_FAULTs on some machines. Fix this by making sure the unity mappings are installed before all other DMA is blocked. Fixes: aafd8ba0 ('iommu/amd: Implement add_device and remove_device') Cc: stable@vger.kernel.org # v4.2+ Signed-off-by: NJoerg Roedel <jroedel@suse.de>
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