AMD IOMMU: add stats counter for free_coherent requests
Impact: see number of free_coherent requests in debugfs
Signed-off-by: NJoerg Roedel <joerg.roedel@amd.com>
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Impact: see number of free_coherent requests in debugfs
Signed-off-by: NJoerg Roedel <joerg.roedel@amd.com>