table of contents
| DMA_MMAP_FROM_COHERE(9) | Device drivers infrastructure | DMA_MMAP_FROM_COHERE(9) |
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.
COPYRIGHT¶
| June 2024 | Kernel Hackers Manual 3.10 |