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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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10
Documentation/core-api/dma-api.rst
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@@ -563,6 +563,16 @@ Free a region of memory previously allocated using dma_alloc_pages().
dev, size, dma_handle and dir must all be the same as those passed into
dma_alloc_pages(). page must be the pointer returned by dma_alloc_pages().
::
int
dma_mmap_pages(struct device *dev, struct vm_area_struct *vma,
size_t size, struct page *page)
Map an allocation returned from dma_alloc_pages() into a user address space.
dev and size must be the same as those passed into dma_alloc_pages().
page must be the pointer returned by dma_alloc_pages().
::
void *