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

Update some descriptions for API arguments and descriptions.

Signed-off-by: Gioh Kim <gioh.kim@lge.com>
Signed-off-by: Sumit Semwal <sumit.semwal@linaro.org>
hifive-unleashed-5.1
Gioh Kim 2014-05-14 08:49:43 +09:00 committed by Sumit Semwal
parent f1bd473f95
commit a07b3b4508
1 changed files with 8 additions and 6 deletions
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14
Documentation/dma-buf-sharing.txt
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@ -56,10 +56,10 @@ The dma_buf buffer sharing API usage contains the following steps:
size_t size, int flags, size_t size, int flags,
const char *exp_name) const char *exp_name)
If this succeeds, dma_buf_export allocates a dma_buf structure, and returns a If this succeeds, dma_buf_export_named allocates a dma_buf structure, and
pointer to the same. It also associates an anonymous file with this buffer, returns a pointer to the same. It also associates an anonymous file with this
so it can be exported. On failure to allocate the dma_buf object, it returns buffer, so it can be exported. On failure to allocate the dma_buf object,
NULL. it returns NULL.
'exp_name' is the name of exporter - to facilitate information while 'exp_name' is the name of exporter - to facilitate information while
debugging. debugging.
@ -76,7 +76,7 @@ The dma_buf buffer sharing API usage contains the following steps:
drivers and/or processes. drivers and/or processes.
Interface: 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; This API installs an fd for the anonymous file associated with this buffer;
returns either 'fd', or error. 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. "dma_buf->ops->" indirection from the users of this interface.
In struct dma_buf_ops, unmap_dma_buf is defined as 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 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. map_dma_buf, this API also must be implemented by the exporter.