[PATCH v5 21/29] iommufd: Allow an input data_type via iommu_hw_info

[Tian, Kevin]

> From: Nicolin Chen <nicolinc at 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 at nvidia.com>

Reviewed-by: Kevin Tian <kevin.tian at intel.com>