dma_mmap_from_coherent
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## Name

dma_mmap_from_coherent — try to mmap the memory allocated from per-device coherent memory pool to userspace

## Synopsis

`int dma_mmap_from_coherent (` | struct device * dev,
| struct vm_area_struct * vma,
| void * vaddr,
| size_t size,
| int * ret`)`;

## Arguments

`dev`

  device from which the memory was allocated

`vma`

  vm_area for the userspace memory

`vaddr`

  cpu address returned by dma_alloc_from_coherent

`size`

  size of the memory buffer allocated by dma_alloc_from_coherent

`ret`

  result from `remap_pfn_range`

## Description

This checks whether the memory was allocated from the per-device coherent memory pool and if so, maps that memory to the provided vma.

Returns 1 if we correctly mapped the memory, or 0 if the caller should proceed with mapping memory from generic pools.

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