mm/hmm: let users to tag specific PFN with DMA mapped bit

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Introduce new sticky flag (HMM_PFN_DMA_MAPPED), which isn't overwritten
by HMM range fault. Such flag allows users to tag specific PFNs with
information if this specific PFN was already DMA mapped.

Tested-by: Jens Axboe <axboe@kernel.dk>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Jason Gunthorpe <jgg@nvidia.com>
Signed-off-by: Leon Romanovsky <leonro@nvidia.com>

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Leon Romanovsky 2025-04-28 12:22:16 +03:00 • committed by Leon Romanovsky

parent 972aa49a7c

commit 285e871884

2 changed files with 50 additions and 21 deletions

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20

include/linux/hmm.h

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51

mm/hmm.c

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