Commit a07b3b45 authored by Gioh Kim's avatar Gioh Kim Committed by Sumit Semwal

Documentation/dma-buf-sharing.txt: update API descriptions

Update some descriptions for API arguments and descriptions.
Signed-off-by: default avatarGioh Kim <gioh.kim@lge.com>
Signed-off-by: default avatarSumit Semwal <sumit.semwal@linaro.org>
parent f1bd473f
......@@ -56,10 +56,10 @@ The dma_buf buffer sharing API usage contains the following steps:
size_t size, int flags,
const char *exp_name)
If this succeeds, dma_buf_export allocates a dma_buf structure, and returns a
pointer to the same. It also associates an anonymous file with this buffer,
so it can be exported. On failure to allocate the dma_buf object, it returns
NULL.
If this succeeds, dma_buf_export_named allocates a dma_buf structure, and
returns a pointer to the same. It also associates an anonymous file with this
buffer, so it can be exported. On failure to allocate the dma_buf object,
it returns NULL.
'exp_name' is the name of exporter - to facilitate information while
debugging.
......@@ -76,7 +76,7 @@ The dma_buf buffer sharing API usage contains the following steps:
drivers and/or processes.
Interface:
int dma_buf_fd(struct dma_buf *dmabuf)
int dma_buf_fd(struct dma_buf *dmabuf, int flags)
This API installs an fd for the anonymous file associated with this buffer;
returns either 'fd', or error.
......@@ -157,7 +157,9 @@ to request use of buffer for allocation.
"dma_buf->ops->" indirection from the users of this interface.
In struct dma_buf_ops, unmap_dma_buf is defined as
void (*unmap_dma_buf)(struct dma_buf_attachment *, struct sg_table *);
void (*unmap_dma_buf)(struct dma_buf_attachment *,
struct sg_table *,
enum dma_data_direction);
unmap_dma_buf signifies the end-of-DMA for the attachment provided. Like
map_dma_buf, this API also must be implemented by the exporter.
......
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