table of contents
| 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, enum dma_data_direction direction);
ARGUMENTS¶
dmabuf
[in] buffer to prepare cpu access for.
direction
[in] length of range for cpu access.
DESCRIPTION¶
After the cpu access is complete the caller should call dma_buf_end_cpu_access. Only when cpu access is braketed by both calls is it guaranteed to be coherent with other DMA access.
Can return negative error values, returns 0 on success.
COPYRIGHT¶
| June 2023 | Kernel Hackers Manual 3.10 |