DMA_BUF_BEGIN_CPU_AC(9) Device drivers infrastructure DMA_BUF_BEGIN_CPU_AC(9)
NAME dma_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.
COPYRIGHT Kernel Hackers Manual 2.6. July 2015 DMA_BUF_BEGIN_CPU_AC(9)