> From: Nicolin Chen <nicolinc@xxxxxxxxxx> > 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@xxxxxxxxxx> Reviewed-by: Kevin Tian <kevin.tian@xxxxxxxxx>
