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When a PASID is stopped or terminated, there can be pending PRQs (requests that haven't received responses) in remapping hardware. This adds the interface to drain page requests and call it when a PASID is terminated. Signed-off-by: Jacob Pan <jacob.jun.pan@linux.intel.com> Signed-off-by: Liu Yi L <yi.l.liu@intel.com> Signed-off-by: Lu Baolu <baolu.lu@linux.intel.com> Link: https://lore.kernel.org/r/20200516062101.29541-16-baolu.lu@linux.intel.com Signed-off-by: Joerg Roedel <jroedel@suse.de>