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authorChristoph Hellwig <hch@lst.de>2021-01-28 14:53:22 +0100
committerChristoph Hellwig <hch@lst.de>2021-03-15 10:02:31 +0100
commiteedb0b12d091a21909b5e84d9f3e5e649305bd12 (patch)
tree82524abc75941a66dedc9f476cd576eebc7ba225 /Documentation/core-api
parent1e28eed17697bcf343c6743f0028cc3b5dd88bf0 (diff)
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.rst10
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,