Commit dc2e6929 authored by Leon Romanovsky's avatar Leon Romanovsky Committed by Marek Szyprowski
Browse files

iommu: add kernel-doc for iommu_unmap_fast 



Add kernel-doc section for iommu_unmap_fast to document existing
limitation of underlying functions which can't split individual ranges.

Suggested-by: default avatarJason Gunthorpe <jgg@nvidia.com>
Acked-by: default avatarWill Deacon <will@kernel.org>
Reviewed-by: default avatarChristoph Hellwig <hch@lst.de>
Tested-by: default avatarJens Axboe <axboe@kernel.dk>
Reviewed-by: default avatarJason Gunthorpe <jgg@nvidia.com>
Reviewed-by: default avatarLuis Chamberlain <mcgrof@kernel.org>
Reviewed-by: default avatarLu Baolu <baolu.lu@linux.intel.com>
Signed-off-by: default avatarLeon Romanovsky <leonro@nvidia.com>
Signed-off-by: default avatarMarek Szyprowski <m.szyprowski@samsung.com>
parent 5c87cffe

drivers/iommu/iommu.c

+19 −0
Original line number Diff line number Diff line
@@ -2618,6 +2618,25 @@ size_t iommu_unmap(struct iommu_domain *domain, 
}

EXPORT_SYMBOL_GPL(iommu_unmap);



/**

 * iommu_unmap_fast() - Remove mappings from a range of IOVA without IOTLB sync

 * @domain: Domain to manipulate

 * @iova: IO virtual address to start

 * @size: Length of the range starting from @iova

 * @iotlb_gather: range information for a pending IOTLB flush

 *

 * iommu_unmap_fast() will remove a translation created by iommu_map().

 * It can't subdivide a mapping created by iommu_map(), so it should be

 * called with IOVA ranges that match what was passed to iommu_map(). The

 * range can aggregate contiguous iommu_map() calls so long as no individual

 * range is split.

 *

 * Basically iommu_unmap_fast() is the same as iommu_unmap() but for callers

 * which manage the IOTLB flushing externally to perform a batched sync.

 *

 * Returns: Number of bytes of IOVA unmapped. iova + res will be the point

 * unmapping stopped.

 */

size_t iommu_unmap_fast(struct iommu_domain *domain,

			unsigned long iova, size_t size,

			struct iommu_iotlb_gather *iotlb_gather)