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| author | Linus Torvalds <torvalds@linux-foundation.org> | 2013-05-01 18:44:37 +0400 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2013-05-01 18:44:37 +0400 |
| commit | b0ca4d0123608cfec73fc689c74295da89fc934e (patch) | |
| tree | 4d79f2b9c3277501637e0dcd6c541416091e4308 /Documentation/dma-buf-sharing.txt | |
| parent | d70b1e06eb331afe1576ac23bb9523708026ba1f (diff) | |
| parent | b89e35636bc75b72d15a1af6d49798802aff77d5 (diff) | |
| download | linux-b0ca4d0123608cfec73fc689c74295da89fc934e.tar.xz | |
Merge tag 'tag-for-linus-3.10' of git://git.linaro.org/people/sumitsemwal/linux-dma-buf
Pull dma-buf updates from Sumit Semwal:
"Added debugfs support to dma-buf"
* tag 'tag-for-linus-3.10' of git://git.linaro.org/people/sumitsemwal/linux-dma-buf:
dma-buf: Add debugfs support
dma-buf: replace dma_buf_export() with dma_buf_export_named()
Diffstat (limited to 'Documentation/dma-buf-sharing.txt')
| -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 |