diff options
| author | Andy Shevchenko <andriy.shevchenko@linux.intel.com> | 2026-01-08 13:50:12 +0300 |
|---|---|---|
| committer | Vinod Koul <vkoul@kernel.org> | 2026-01-09 06:06:00 +0300 |
| commit | 80c70bfb95cdbe0c644070f4ca4754a60f0a4830 (patch) | |
| tree | 79398b6fe665c89718f850cbfecef15e12bb7083 /include | |
| parent | fe7b87d908da33326fbf6fe2b3830426432ec66c (diff) | |
| download | linux-80c70bfb95cdbe0c644070f4ca4754a60f0a4830.tar.xz | |
scatterlist: introduce sg_nents_for_dma() helper
Sometimes the user needs to split each entry on the mapped scatter list
due to DMA length constrains. This helper returns a number of entities
assuming that each of them is not bigger than supplied maximum length.
Reviewed-by: Bjorn Andersson <andersson@kernel.org>
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Link: https://patch.msgid.link/20260108105619.3513561-2-andriy.shevchenko@linux.intel.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>
Diffstat (limited to 'include')
| -rw-r--r-- | include/linux/scatterlist.h | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/include/linux/scatterlist.h b/include/linux/scatterlist.h index 29f6ceb98d74..6de1a2434299 100644 --- a/include/linux/scatterlist.h +++ b/include/linux/scatterlist.h @@ -441,6 +441,8 @@ static inline void sg_init_marker(struct scatterlist *sgl, int sg_nents(struct scatterlist *sg); int sg_nents_for_len(struct scatterlist *sg, u64 len); +int sg_nents_for_dma(struct scatterlist *sgl, unsigned int sglen, size_t len); + struct scatterlist *sg_last(struct scatterlist *s, unsigned int); void sg_init_table(struct scatterlist *, unsigned int); void sg_init_one(struct scatterlist *, const void *, unsigned int); |