linux-kernel - [RFC v2 0/3] dma-buf/sync_file: rework fences on struct sync

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Message-Id: <1467055762-25881-1-git-send-email-gustavo@padovan.org>
Date:	Mon, 27 Jun 2016 16:29:19 -0300
From:	Gustavo Padovan <gustavo@...ovan.org>
To:	dri-devel@...ts.freedesktop.org
Cc:	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: [RFC v2 0/3] dma-buf/sync_file: rework fences on struct sync_file

From: Gustavo Padovan <gustavo.padovan@...labora.co.uk>

Hi all,

This is an attempt to improve fence support on Sync File. The basic idea
is to have only sync_file->fence and store all fences there, either as
normal fences or fence_arrays. That way we can remove some potential
duplication when using fence_array with sync_file: the duplication of the array
of fences and the duplication of fence_add_callback() for all fences.

Now when creating a new sync_file during the merge process sync_file_set_fence()
will set sync_file->fence based on the number of fences for that sync_file. If
there is more than one fence a fence_array is created. One important advantage
approach is that we only add one fence callback now, no matter how many fences
there are in a sync_file - the individual callbacks are added by fence_array.

Please review! Thanks!

	Gustavo

Changes since v1 (Comments from Chris Wilson and Christian König):
	- Not using fence_ops anymore.
	- fence_is_array() was created to differentiate fence from fence_array
	- fence_array_teardown() is now exported and used under fence_is_array()
	- struct sync_file lost num_fences member

Gustavo Padovan (3):
  dma-buf/fence-array: add fence_is_array()
  dma-buf/fence-array: add fence_array_teardown()
  dma-buf/sync_file: rework fence storage in struct file

 drivers/dma-buf/fence-array.c        |  25 ++++++
 drivers/dma-buf/sync_file.c          | 148 +++++++++++++++++++++++------------
 drivers/staging/android/sync_debug.c |   9 ++-
 include/linux/fence-array.h          |  11 +++
 include/linux/sync_file.h            |  15 ++--
 5 files changed, 147 insertions(+), 61 deletions(-)

-- 
2.5.5