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The amdxdna driver normally performs DMA using userspace virtual address plus PASID. For debugging and validation purposes, add a module parameter, force_iova, to force DMA to go through IOMMU IOVA mapping. When force_iova=1 is set, the driver will allocate and map DMA buffers using IOVA. Reviewed-by: Mario Limonciello (AMD) <superm1@kernel.org> Signed-off-by: Lizhi Hou <lizhi.hou@amd.com> Link: https://patch.msgid.link/20260126193001.1400545-1-lizhi.hou@amd.com