DMA_BUF_BEGIN_CPU_AC(9) Device drivers infrastructure DMA_BUF_BEGIN_CPU_AC(9)NAMEdma_buf_begin_cpu_access - Must be called before accessing a dma_buf
from the cpu in the kernel context. Calls begin_cpu_access to allow
exporter-specific preparations. Coherency is only guaranteed in the
specified range for the specified access direction.
SYNOPSIS
int dma_buf_begin_cpu_access(struct dma_buf * dmabuf, size_t start,
size_t len,
enum dma_data_direction direction);
ARGUMENTS
dmabuf
[in] buffer to prepare cpu access for.
start
[in] start of range for cpu access.
len
[in] length of range for cpu access.
direction
[in] length of range for cpu access.
DESCRIPTION
Can return negative error values, returns 0 on success.
COPYRIGHTKernel Hackers Manual 3.11 November 2013 DMA_BUF_BEGIN_CPU_AC(9)