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.