linux-kernel - Re: [PATCH v5 4/5] Documentation: add doc for sync_file_get

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Date:	Fri, 5 Aug 2016 08:23:02 +0100
From:	Chris Wilson <chris@...is-wilson.co.uk>
To:	Gustavo Padovan <gustavo@...ovan.org>
Cc:	dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
	Daniel Stone <daniels@...labora.com>,
	Daniel Vetter <daniel.vetter@...ll.ch>,
	Rob Clark <robdclark@...il.com>,
	Greg Hackmann <ghackmann@...gle.com>,
	John Harrison <John.C.Harrison@...el.com>,
	laurent.pinchart@...asonboard.com, seanpaul@...gle.com,
	marcheu@...gle.com, m.chehab@...sung.com,
	Sumit Semwal <sumit.semwal@...aro.org>,
	Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
	Gustavo Padovan <gustavo.padovan@...labora.co.uk>
Subject: Re: [PATCH v5 4/5] Documentation: add doc for sync_file_get_fence()

On Thu, Aug 04, 2016 at 11:24:13PM -0300, Gustavo Padovan wrote:
> From: Gustavo Padovan <gustavo.padovan@...labora.co.uk>
> 
> Document the new function added to sync_file.c
> 
> v2: Adapt to fence_array
> 
> Signed-off-by: Gustavo Padovan <gustavo.padovan@...labora.co.uk>
> Acked-by: Christian König <christian.koenig@....com>
> ---
>  Documentation/sync_file.txt | 15 +++++++++++++++
>  1 file changed, 15 insertions(+)
> 
> diff --git a/Documentation/sync_file.txt b/Documentation/sync_file.txt
> index e8e2eba..ae2dbad1 100644
> --- a/Documentation/sync_file.txt
> +++ b/Documentation/sync_file.txt
> @@ -64,6 +64,21 @@ 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 pass file descriptor

s/pass/passes/

> +of the Sync File to the kernel. The kernel then can retrieve the fences

/then can/can then/

> +from it.
> +
> +Interface:
> +	struct fence *sync_file_get_fence(int fd);
> +
> +
> +The function return a struct fence pointer referencing the fence(s) in the Sync
> +File.

+ 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.

Reviewed-by: Chris Wilson <chris@...is-wilson.co.uk>
-Chris

-- 
Chris Wilson, Intel Open Source Technology Centre