[PATCH v2 5/7] iommu: Turn fault_data to iommufd private pointer

[Jason Gunthorpe]

On Wed, Feb 19, 2025 at 05:31:40PM -0800, Nicolin Chen wrote:
> A "fault_data" was added exclusively for the iommufd_fault_iopf_handler()
> used by IOPF/PRI use cases, along with the attach_handle. Now, the iommufd
> version of the sw_msi function will reuse the attach_handle and fault_data
> for a non-fault case.
> 
> Rename "fault_data" to "iommufd_hwpt" so as not to confine it to a "fault"
> case. Move it into a union to be the iommufd private pointer. A following
> patch will move the iova_cookie to the union for dma-iommu too after the
> iommufd_sw_msi implementation is added.
> 
> Since we have two unions now, add some simple comments for readability.
> 
> Signed-off-by: Nicolin Chen <nicolinc at nvidia.com>
> ---
>  include/linux/iommu.h                | 6 ++++--
>  drivers/iommu/iommufd/fault.c        | 2 +-
>  drivers/iommu/iommufd/hw_pagetable.c | 2 +-
>  3 files changed, 6 insertions(+), 4 deletions(-)

Reviewed-by: Jason Gunthorpe <jgg at nvidia.com>

Jason