iommupt: Add iova_to_phys op

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iova_to_phys is a performance path for the DMA API and iommufd, implement
it using an unrolled get_user_pages() like function waterfall scheme.

The implementation itself is fairly trivial.

Reviewed-by: Kevin Tian <kevin.tian@intel.com>
Reviewed-by: Pasha Tatashin <pasha.tatashin@soleen.com>
Reviewed-by: Samiullah Khawaja <skhawaja@google.com>
Tested-by: Alejandro Jimenez <alejandro.j.jimenez@oracle.com>
Tested-by: Pasha Tatashin <pasha.tatashin@soleen.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>

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Jason Gunthorpe 2025-11-04 14:30:03 -04:00 • committed by Joerg Roedel

parent 879ced2bab

commit 9d4c274cd7

2 changed files with 119 additions and 5 deletions

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105

drivers/iommu/generic_pt/iommu_pt.h

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19

include/linux/generic_pt/iommu.h

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