dma-coherent: add documentation to new interfaces
Signed-off-by: Dmitry Baryshkov <dbaryshkov@gmail.com> Cc: Jesse Barnes <jbarnes@virtuousgeek.org> Signed-off-by: Ingo Molnar <mingo@elte.hu>
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@ -92,6 +92,21 @@ void *dma_mark_declared_memory_occupied(struct device *dev,
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}
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EXPORT_SYMBOL(dma_mark_declared_memory_occupied);
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/**
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* Try to allocate memory from the per-device coherent area.
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*
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* @dev: device from which we allocate memory
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* @size: size of requested memory area
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* @dma_handle: This will be filled with the correct dma handle
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* @ret: This pointer will be filled with the virtual address
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* to allocated area.
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*
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* This function should be only called from per-arch %dma_alloc_coherent()
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* to support allocation from per-device coherent memory pools.
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*
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* Returns 0 if dma_alloc_coherent should continue with allocating from
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* generic memory areas, or !0 if dma_alloc_coherent should return %ret.
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*/
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int dma_alloc_from_coherent(struct device *dev, ssize_t size,
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dma_addr_t *dma_handle, void **ret)
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{
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@ -111,6 +126,19 @@ int dma_alloc_from_coherent(struct device *dev, ssize_t size,
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return (mem != NULL);
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}
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/**
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* Try to free the memory allocated from per-device coherent memory pool.
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* @dev: device from which the memory was allocated
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* @order: the order of pages allocated
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* @vaddr: virtual address of allocated pages
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*
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* This checks whether the memory was allocated from the per-device
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* coherent memory pool and if so, releases that memory.
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*
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* Returns 1 if we correctly released the memory, or 0 if
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* %dma_release_coherent() should proceed with releasing memory from
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* generic pools.
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*/
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int dma_release_from_coherent(struct device *dev, int order, void *vaddr)
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{
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struct dma_coherent_mem *mem = dev ? dev->dma_mem : NULL;
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