iommupt: Avoid rewalking during map

Currently the core code provides a simplified interface to drivers where
it fragments a requested multi-page map into single page size steps after
doing all the calculations to figure out what page size is
appropriate. Each step rewalks the page tables from the start.

Since iommupt has a single implementation of the mapping algorithm it can
internally compute each step as it goes while retaining its current
position in the walk.

Add a new function pt_pgsz_count() which computes the same page size
fragement of a large mapping operations.

Compute the next fragment when all the leaf entries of the current
fragement have been written, then continue walking from the current
point.

The function pointer is run through pt_iommu_ops instead of
iommu_domain_ops to discourage using it outside iommupt. All drivers with
their own page tables should continue to use the simplified map_pages()
style interfaces.

Reviewed-by: Samiullah Khawaja <skhawaja@google.com>
Reviewed-by: Kevin Tian <kevin.tian@intel.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
Reviewed-by: Lu Baolu <baolu.lu@linux.intel.com>
Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>

0 files changed, 0 insertions, 0 deletions