iommu/vt-d: Dynamically allocate and free seq_id for DMAR units
Introduce functions to support dynamic IOMMU seq_id allocating and releasing, which will be used to support DMAR hotplug. Also rename IOMMU_UNITS_SUPPORTED as DMAR_UNITS_SUPPORTED. Signed-off-by: NJiang Liu <jiang.liu@linux.intel.com> Reviewed-by: NYijing Wang <wangyijing@huawei.com> Signed-off-by: NJoerg Roedel <jroedel@suse.de>
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