linux-kernel - Re: [PATCH 02/11] dma-buf/fence: add fence

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Date:	Thu, 2 Jun 2016 09:20:15 +0200
From:	Christian König <deathsimple@...afone.de>
To:	Sumit Semwal <sumit.semwal@...aro.org>,
	Gustavo Padovan <gustavo@...ovan.org>,
	DRI mailing list <dri-devel@...ts.freedesktop.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Chris Wilson <chris@...is-wilson.co.uk>
Subject: Re: [PATCH 02/11] dma-buf/fence: add fence_array fences v6

Am 02.06.2016 um 00:44 schrieb Daniel Vetter:
> On Wed, Jun 01, 2016 at 09:54:04PM +0530, Sumit Semwal wrote:
>> Hi Christian, Gustavo,
>>
>> Thanks for these patches.
>>
>> On 1 June 2016 at 20:55, Gustavo Padovan <gustavo@...ovan.org> wrote:
>>> 2016-06-01 Christian König <deathsimple@...afone.de>:
>>>
>>>> From: Gustavo Padovan <gustavo.padovan@...labora.co.uk>
>>>>
>>>> struct fence_collection inherits from struct fence and carries a
>>>> collection of fences that needs to be waited together.
>>>>
>>>> It is useful to translate a sync_file to a fence to remove the complexity
>>>> of dealing with sync_files on DRM drivers. So even if there are many
>>>> fences in the sync_file that needs to waited for a commit to happen,
>>>> they all get added to the fence_collection and passed for DRM use as
>>>> a standard struct fence.
>>>>
>>>> That means that no changes needed to any driver besides supporting fences.
>>>>
>>>> fence_collection's fence doesn't belong to any timeline context, so
>>>> fence_is_later() and fence_later() are not meant to be called with
>>>> fence_collections fences.
>>>>
>>>> v2: Comments by Daniel Vetter:
>>>>        - merge fence_collection_init() and fence_collection_add()
>>>>        - only add callbacks at ->enable_signalling()
>>>>        - remove fence_collection_put()
>>>>        - check for type on to_fence_collection()
>>>>        - adjust fence_is_later() and fence_later() to WARN_ON() if they
>>>>        are used with collection fences.
>>>>
>>>> v3: - Initialize fence_cb.node at fence init.
>>>>
>>>>      Comments by Chris Wilson:
>>>>        - return "unbound" on fence_collection_get_timeline_name()
>>>>        - don't stop adding callbacks if one fails
>>>>        - remove redundant !! on fence_collection_enable_signaling()
>>>>        - remove redundant () on fence_collection_signaled
>>>>        - use fence_default_wait() instead
>>>>
>>>> v4 (chk): Rework, simplification and cleanup:
>>>>        - Drop FENCE_NO_CONTEXT handling, always allocate a context.
>>>>        - Rename to fence_array.
>>>>        - Return fixed driver name.
>>>>        - Register only one callback at a time.
>>>>        - Document that create function takes ownership of array.
>>>>
>>>> v5 (chk): More work and fixes:
>>>>        - Avoid deadlocks by adding all callbacks at once again.
>>>>        - Stop trying to remove the callbacks.
>>>>        - Provide context and sequence number for the array fence.
>>>>
>>>> v6 (chk): Fixes found during testing
>>>>        - Fix stupid typo in _enable_signaling().
>>>>
>>>> Signed-off-by: Gustavo Padovan <gustavo.padovan@...labora.co.uk>
>>>> Signed-off-by: Christian König <christian.koenig@....com>
>>>> ---
>>>>   drivers/dma-buf/Makefile      |   2 +-
>>>>   drivers/dma-buf/fence-array.c | 127 ++++++++++++++++++++++++++++++++++++++++++
>>>>   include/linux/fence-array.h   |  72 ++++++++++++++++++++++++
>>>>   3 files changed, 200 insertions(+), 1 deletion(-)
>>>>   create mode 100644 drivers/dma-buf/fence-array.c
>>>>   create mode 100644 include/linux/fence-array.h
>>> This is working fine to me. Once the commit message is fixed:
>>>
>>> Reviewed-by: Gustavo Padovan <gustavo.padovan@...labora.co.uk>
>>>
>>> You need to Cc Sumit here to decide who is picking these patches.
>>> It would be better to get them through the drm trees so we would need
>>> his Ack at least.
>>>
>> +1 on the commit message consistency change; post that, please feel
>> free to add my
>> Acked-by: Sumit Semwal <sumit.semwal@...aro.org>
>>
>> for the 3 dma-buf/fences patches and request to take them via DRM tree
>> as rightly suggested by Gustavo.
> Commit message improved and all 3 queued up for drm-misc. I haven't pushed
> out the new branch yet though, since I'm waiting for Dave to open drm-next
> and pull in a few other bits first so that I can rebase.

Thanks and sorry for missing the commit message. I was a bit to 
concentrated on fixing the code.

Leave me a note when the branch is public available, cause I then want 
to rebase the amdgpu changes on top and send a pull request to Alex.

Christian.

>
> Thanks, Daniel