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dma-mapping: add a dma_mmap_pages helper

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Add a helper to map memory allocated using dma_alloc_pages into
a user address space, similar to the dma_alloc_attrs function for
coherent allocations.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Tomasz Figa <tfiga@chromium.org>
Tested-by: Ricardo Ribalda <ribalda@chromium.org>
This commit is contained in:
Christoph Hellwig
2021-01-28 14:53:22 +01:00
parent 1e28eed176
commit eedb0b12d0
3 changed files with 25 additions and 0 deletions
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2
include/linux/dma-mapping.h
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@@ -263,6 +263,8 @@ struct page *dma_alloc_pages(struct device *dev, size_t size,
dma_addr_t *dma_handle, enum dma_data_direction dir, gfp_t gfp);
void dma_free_pages(struct device *dev, size_t size, struct page *page,
dma_addr_t dma_handle, enum dma_data_direction dir);
int dma_mmap_pages(struct device *dev, struct vm_area_struct *vma,
size_t size, struct page *page);
static inline void *dma_alloc_noncoherent(struct device *dev, size_t size,
dma_addr_t *dma_handle, enum dma_data_direction dir, gfp_t gfp)