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iommu: Allow an input type in hw_info op

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The hw_info uAPI will support a bidirectional data_type field that can be
used as an input field for user space to request for a specific info data.

To prepare for the uAPI update, change the iommu layer first:
 - Add a new IOMMU_HW_INFO_TYPE_DEFAULT as an input, for which driver can
   output its only (or firstly) supported type
 - Update the kdoc accordingly
 - Roll out the type validation in the existing drivers

Link: https://patch.msgid.link/r/00f4a2d3d930721f61367014717b3ba2d1e82a81.1752126748.git.nicolinc@nvidia.com
Reviewed-by: Kevin Tian <kevin.tian@intel.com>
Reviewed-by: Jason Gunthorpe <jgg@nvidia.com>
Reviewed-by: Lu Baolu <baolu.lu@linux.intel.com>
Reviewed-by: Pranjal Shrivastava <praan@google.com>
Signed-off-by: Nicolin Chen <nicolinc@nvidia.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
This commit is contained in:
Nicolin Chen 2025-07-09 22:59:12 -07:00 • committed by Jason Gunthorpe
commit 62622a8753
6 changed files with 20 additions and 2 deletions
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