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| author | Sumit Semwal <sumit.semwal@linaro.org> | 2013-03-22 18:22:16 +0530 |
|---|---|---|
| committer | Sumit Semwal <sumit.semwal@linaro.org> | 2013-05-01 16:35:36 +0530 |
| commit | 78df969550e7187f4dcd70b737217dcbc8e9a06a (patch) | |
| tree | a10524a478ce83555904ce27363bd68140f031bc /Documentation | |
| parent | 5f56886521d6ddd3648777fae44d82382dd8c87f (diff) | |
| download | linux-78df969550e7187f4dcd70b737217dcbc8e9a06a.tar.bz2 | |
dma-buf: replace dma_buf_export() with dma_buf_export_named()
For debugging purposes, it is useful to have a name-string added
while exporting buffers. Hence, dma_buf_export() is replaced with
dma_buf_export_named(), which additionally takes 'exp_name' as a
parameter.
For backward compatibility, and for lazy exporters who don't wish to
name themselves, a #define dma_buf_export() is also made available,
which adds a __FILE__ instead of 'exp_name'.
Cc: Daniel Vetter <daniel.vetter@ffwll.ch>
[Thanks for the idea!]
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Signed-off-by: Sumit Semwal <sumit.semwal@linaro.org>
Diffstat (limited to 'Documentation')
| -rw-r--r-- | Documentation/dma-buf-sharing.txt | 13 |
1 files changed, 11 insertions, 2 deletions
diff --git a/Documentation/dma-buf-sharing.txt b/Documentation/dma-buf-sharing.txt index 4966b1be42ac..0b23261561d2 100644 --- a/Documentation/dma-buf-sharing.txt +++ b/Documentation/dma-buf-sharing.txt @@ -52,14 +52,23 @@ The dma_buf buffer sharing API usage contains the following steps: associated with this buffer. Interface: - struct dma_buf *dma_buf_export(void *priv, struct dma_buf_ops *ops, - size_t size, int flags) + struct dma_buf *dma_buf_export_named(void *priv, struct dma_buf_ops *ops, + 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. + 'exp_name' is the name of exporter - to facilitate information while + debugging. + + Exporting modules which do not wish to provide any specific name may use the + helper define 'dma_buf_export()', with the same arguments as above, but + without the last argument; a __FILE__ pre-processor directive will be + inserted in place of 'exp_name' instead. + 2. Userspace gets a handle to pass around to potential buffer-users Userspace entity requests for a file-descriptor (fd) which is a handle to the |