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- jessie 3.16.56-1+deb8u1
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¶
May 2018 | Kernel Hackers Manual 3.16 |