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| author | Pavel Begunkov <asml.silence@gmail.com> | 2026-10-14 12:02:00 +0100 |
|---|---|---|
| committer | Jens Axboe <axboe@kernel.dk> | 2026-10-14 07:36:02 -0600 |
| commit | aeb3bb52052b3548b3acf0cc5606dbb5babb228b (patch) | |
| tree | a8a81cce816ec16cb3b3857d0a1f56dfc22976ff /include/linux | |
| parent | 0d3120db2cbe0a8793650e19f0923968a406ca2e (diff) | |
| download | linux-aeb3bb52052b3548b3acf0cc5606dbb5babb228b.tar.gz linux-aeb3bb52052b3548b3acf0cc5606dbb5babb228b.zip | |
iov_iter: add iterator type for dmabuf maps
Introduce a new iterator type for dmabuf maps. The map in an opaque
object with internals and format specific to the subsystem / driver, and
only it can use that subsystem / driver for issuing IO. The task of the
middle layers is to pass the map / iterator further down, maybe doing
basic splitting and length checking. The iterator can only be used by
operations of the file the associated map was created for.
Suggested-by: Keith Busch <kbusch@kernel.org>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Link: https://patch.msgid.link/6aedb1c606f20ae5bd7fa358829966384c6e738f.1791975048.git.asml.silence@gmail.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'include/linux')
| -rw-r--r-- | include/linux/iov_iter.h | 2 | ||||
| -rw-r--r-- | include/linux/uio.h | 11 |
2 files changed, 13 insertions, 0 deletions
diff --git a/include/linux/iov_iter.h b/include/linux/iov_iter.h index f9a17fbbd398..2f91884d733b 100644 --- a/include/linux/iov_iter.h +++ b/include/linux/iov_iter.h @@ -310,6 +310,8 @@ size_t iterate_and_advance2(struct iov_iter *iter, size_t len, void *priv, return iterate_folioq(iter, len, priv, priv2, step); if (iov_iter_is_xarray(iter)) return iterate_xarray(iter, len, priv, priv2, step); + if (WARN_ON_ONCE(iov_iter_is_dmabuf_map(iter))) + return 0; return iterate_discard(iter, len, priv, priv2, step); } diff --git a/include/linux/uio.h b/include/linux/uio.h index fe2e985d74d2..638c1116e912 100644 --- a/include/linux/uio.h +++ b/include/linux/uio.h @@ -12,6 +12,7 @@ struct page; struct folio_queue; +struct dma_buf_io_map; typedef unsigned int __bitwise iov_iter_extraction_t; @@ -29,6 +30,7 @@ enum iter_type { ITER_FOLIOQ, ITER_XARRAY, ITER_DISCARD, + ITER_DMABUF_MAP, }; #define ITER_SOURCE 1 // == WRITE @@ -71,6 +73,7 @@ struct iov_iter { const struct folio_queue *folioq; struct xarray *xarray; void __user *ubuf; + struct dma_buf_io_map *dmabuf_map; }; size_t count; }; @@ -155,6 +158,11 @@ static inline bool iov_iter_is_xarray(const struct iov_iter *i) return iov_iter_type(i) == ITER_XARRAY; } +static inline bool iov_iter_is_dmabuf_map(const struct iov_iter *i) +{ + return iov_iter_type(i) == ITER_DMABUF_MAP; +} + static inline unsigned char iov_iter_rw(const struct iov_iter *i) { return i->data_source ? WRITE : READ; @@ -300,6 +308,9 @@ void iov_iter_folio_queue(struct iov_iter *i, unsigned int direction, unsigned int first_slot, unsigned int offset, size_t count); void iov_iter_xarray(struct iov_iter *i, unsigned int direction, struct xarray *xarray, loff_t start, size_t count); +void iov_iter_dmabuf_map(struct iov_iter *i, unsigned int direction, + struct dma_buf_io_map *map, + loff_t off, size_t count); ssize_t iov_iter_get_pages2(struct iov_iter *i, struct page **pages, size_t maxsize, unsigned maxpages, size_t *start); ssize_t iov_iter_get_pages_alloc2(struct iov_iter *i, struct page ***pages, |