> From: Nicolin Chen <nicolinc@xxxxxxxxxx> > Sent: Friday, May 9, 2025 11:02 AM > > The new type of vIOMMU for tegra241-cmdqv allows user space VM to use > one > of its virtual command queue HW resources exclusively. This requires user > space to mmap the corresponding MMIO page from kernel space for direct > HW > control. > > To forward the mmap info (offset and length), iommufd should add a driver > specific data structure to the IOMMUFD_CMD_VIOMMU_ALLOC ioctl, for > driver > to output the info during the allocation back to user space. > > Similar to the existing ioctls and their IOMMU handlers, add a user_data > to viommu_alloc op to bridge between iommufd and drivers. > > Reviewed-by: Jason Gunthorpe <jgg@xxxxxxxxxx> > Reviewed-by: Lu Baolu <baolu.lu@xxxxxxxxxxxxxxx> > Reviewed-by: Pranjal Shrivastava <praan@xxxxxxxxxx> > Signed-off-by: Nicolin Chen <nicolinc@xxxxxxxxxx> Reviewed-by: Kevin Tian <kevin.tian@xxxxxxxxx>
