On Sat, Jun 14, 2025 at 12:14:42AM -0700, Nicolin Chen wrote: > 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. > > Reuse the same field by adding an "in_data_type", allowing 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 an IOMMU_HW_INFO_FLAG_INPUT_TYPE to switch between the > old output-only field and the new bidirectional field. > > Reviewed-by: Kevin Tian <kevin.tian@xxxxxxxxx> > Signed-off-by: Nicolin Chen <nicolinc@xxxxxxxxxx> > --- > include/uapi/linux/iommufd.h | 20 +++++++++++++++++++- > drivers/iommu/iommufd/device.c | 9 ++++++--- > 2 files changed, 25 insertions(+), 4 deletions(-) Reviewed-by: Jason Gunthorpe <jgg@xxxxxxxxxx> Jason
