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Add intel_iommu_hw_info() to report cap_reg and ecap_reg information. Link: https://lore.kernel.org/r/20230818101033.4100-6-yi.l.liu@intel.com Signed-off-by: Lu Baolu <baolu.lu@linux.intel.com> Acked-by: Lu Baolu <baolu.lu@linux.intel.com> Reviewed-by: Kevin Tian <kevin.tian@intel.com> Signed-off-by: Nicolin Chen <nicolinc@nvidia.com> Signed-off-by: Yi Liu <yi.l.liu@intel.com> Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>