From: Nicolin Chen nicolinc@nvidia.com Sent: Sunday, May 18, 2025 11:22 AM
The iommu_hw_info can output via the out_data_type field the vendor data type from a driver, but this only allows driver to report one data type.
Now, with SMMUv3 having a Tegra241 CMDQV implementation, it has two sets of types and data structs to report.
One way to support that is to use the same type field bidirectionally.
Rename "out_data_type" to simply "data_type", to allow an input for user space to request for a specific type and to get the corresponding data.
For backward compatibility, since the ioctl handler has never checked an input value, add a new IOMMU_HW_INFO_FLAG_INPUT_TYPE to switch between the old output-only field and the new bidirectional field.
Signed-off-by: Nicolin Chen nicolinc@nvidia.com
Reviewed-by: Kevin Tian kevin.tian@intel.com