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iommu: add kernel-doc for iommu_unmap_fast

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

Suggested-by: Jason Gunthorpe <jgg@nvidia.com>
Acked-by: Will Deacon <will@kernel.org>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Tested-by: Jens Axboe <axboe@kernel.dk>
Reviewed-by: Jason Gunthorpe <jgg@nvidia.com>
Reviewed-by: Luis Chamberlain <mcgrof@kernel.org>
Reviewed-by: Lu Baolu <baolu.lu@linux.intel.com>
Signed-off-by: Leon Romanovsky <leonro@nvidia.com>
Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com>
This commit is contained in:
Leon Romanovsky 2025-05-05 10:01:41 +03:00 committed by Marek Szyprowski
parent 5c87cffe2d
commit dc2e692943
1 changed files with 19 additions and 0 deletions
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19
drivers/iommu/iommu.c
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@ -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)