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Documentation: add doc for sync_file_get_fence() 

Document the new function added to sync_file.c

v2: Adapt to fence_array

v3: Take in Chris Wilson suggestions

Signed-off-by: Gustavo Padovan <gustavo.padovan@collabora.co.uk>
Acked-by: Christian König <christian.koenig@amd.com>
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Sumit Semwal <sumit.semwal@linaro.org>
This commit is contained in:
Gustavo Padovan 2016-08-05 10:39:37 -03:00 committed by Sumit Semwal
parent 972526a409
commit 395dec6f6b
1 changed files with 14 additions and 0 deletions
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14
Documentation/sync_file.txt
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@ -64,6 +64,20 @@ The sync_file fd now can be sent to userspace.
If the creation process fail, or the sync_file needs to be released by any
other reason fput(sync_file->file) should be used.
Receiving Sync Files from Userspace
-----------------------------------
When userspace needs to send an in-fence to the driver it passes file descriptor
of the Sync File to the kernel. The kernel can then retrieve the fences
from it.
Interface:
struct fence *sync_file_get_fence(int fd);
The returned reference is owned by the caller and must be disposed of
afterwards using fence_put(). In case of error, a NULL is returned instead.
References:
[1] struct sync_file in include/linux/sync_file.h
[2] All interfaces mentioned above defined in include/linux/sync_file.h