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| author | Christoph Hellwig <hch@lst.de> | 2021-01-28 14:53:22 +0100 |
|---|---|---|
| committer | Christoph Hellwig <hch@lst.de> | 2021-03-15 10:02:31 +0100 |
| commit | eedb0b12d091a21909b5e84d9f3e5e649305bd12 (patch) | |
| tree | 82524abc75941a66dedc9f476cd576eebc7ba225 /Documentation/core-api | |
| parent | Linux 5.12-rc3 (diff) | |
| download | linux-eedb0b12d091a21909b5e84d9f3e5e649305bd12.tar.xz linux-eedb0b12d091a21909b5e84d9f3e5e649305bd12.zip | |
dma-mapping: add a dma_mmap_pages helper
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>
Diffstat (limited to 'Documentation/core-api')
| -rw-r--r-- | Documentation/core-api/dma-api.rst | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/Documentation/core-api/dma-api.rst b/Documentation/core-api/dma-api.rst index e6d23f117308..157a474ae544 100644 --- a/Documentation/core-api/dma-api.rst +++ b/Documentation/core-api/dma-api.rst @@ -565,6 +565,16 @@ 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 * dma_alloc_noncoherent(struct device *dev, size_t size, dma_addr_t *dma_handle, enum dma_data_direction dir, |