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| author | Leon Romanovsky <leonro@nvidia.com> | 2025-09-09 16:27:39 +0300 |
|---|---|---|
| committer | Marek Szyprowski <m.szyprowski@samsung.com> | 2025-09-12 01:18:21 +0300 |
| commit | f7326196a781622b33bfbdabb00f5e72b5fb5679 (patch) | |
| tree | 3f8450ea4808ff6ca230f24b2e9164a9b4a9bb5b /include/linux/dma-direct.h | |
| parent | bf0ecb3c32396b3518f787d962c575f5a5cf097e (diff) | |
| download | linux-f7326196a781622b33bfbdabb00f5e72b5fb5679.tar.xz | |
dma-mapping: export new dma_*map_phys() interface
Introduce new DMA mapping functions dma_map_phys() and dma_unmap_phys()
that operate directly on physical addresses instead of page+offset
parameters. This provides a more efficient interface for drivers that
already have physical addresses available.
The new functions are implemented as the primary mapping layer, with
the existing dma_map_page_attrs()/dma_map_resource() and
dma_unmap_page_attrs()/dma_unmap_resource() functions converted to simple
wrappers around the phys-based implementations.
In case dma_map_page_attrs(), the struct page is converted to physical
address with help of page_to_phys() function and dma_map_resource()
provides physical address as is together with addition of DMA_ATTR_MMIO
attribute.
The old page-based API is preserved in mapping.c to ensure that existing
code won't be affected by changing EXPORT_SYMBOL to EXPORT_SYMBOL_GPL
variant for dma_*map_phys().
Reviewed-by: Jason Gunthorpe <jgg@nvidia.com>
Reviewed-by: Keith Busch <kbusch@kernel.org>
Signed-off-by: Leon Romanovsky <leonro@nvidia.com>
Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com>
Link: https://lore.kernel.org/r/54cc52af91777906bbe4a386113437ba0bcfba9c.1757423202.git.leonro@nvidia.com
Diffstat (limited to 'include/linux/dma-direct.h')
| -rw-r--r-- | include/linux/dma-direct.h | 2 |
1 files changed, 0 insertions, 2 deletions
diff --git a/include/linux/dma-direct.h b/include/linux/dma-direct.h index f3bc0bcd7098..c249912456f9 100644 --- a/include/linux/dma-direct.h +++ b/include/linux/dma-direct.h @@ -149,7 +149,5 @@ void dma_direct_free_pages(struct device *dev, size_t size, struct page *page, dma_addr_t dma_addr, enum dma_data_direction dir); int dma_direct_supported(struct device *dev, u64 mask); -dma_addr_t dma_direct_map_resource(struct device *dev, phys_addr_t paddr, - size_t size, enum dma_data_direction dir, unsigned long attrs); #endif /* _LINUX_DMA_DIRECT_H */ |