iommupt: Add read_and_clear_dirty op

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IOMMU HW now supports updating a dirty bit in an entry when a DMA writes
to the entry's VA range. iommufd has a uAPI to read and clear the dirty
bits from the tables.

This is a trivial recursive descent algorithm to read and optionally clear
the dirty bits. The format needs a function to tell if a contiguous entry
is dirty, and a function to clear a contiguous entry back to clean.

Reviewed-by: Kevin Tian <kevin.tian@intel.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 14:30:06 -04:00 • committed by Joerg Roedel

parent dcd6a011a8

commit 4a00f94348

2 changed files with 110 additions and 0 deletions

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104

drivers/iommu/generic_pt/iommu_pt.h

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6

include/linux/generic_pt/iommu.h

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