swiotlb: checking whether swiotlb buffer is full with io_tlb_used
This patch uses io_tlb_used to help check whether swiotlb buffer is full. io_tlb_used is no longer used for only debugfs. It is also used to help optimize swiotlb_tbl_map_single(). Suggested-by: NJoe Jin <joe.jin@oracle.com> Signed-off-by: NDongli Zhang <dongli.zhang@oracle.com> Signed-off-by: NKonrad Rzeszutek Wilk <konrad.wilk@oracle.com>
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