linux-kernel - Re: [RFC v2 5/8] drm/fence: add in-fences support

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Message-ID: <CAKMK7uGLL3MQ0ff+nVGhKMEQKJNhpC3C4g1iYSO1JfKfiMy6ag@mail.gmail.com>
Date:	Thu, 28 Apr 2016 19:43:16 +0200
From:	Daniel Vetter <daniel@...ll.ch>
To:	Ville Syrjälä <ville.syrjala@...ux.intel.com>
Cc:	Gustavo Padovan <gustavo@...ovan.org>,
	Daniel Stone <daniel@...ishbar.org>,
	Greg Hackmann <ghackmann@...gle.com>,
	Gustavo Padovan <gustavo.padovan@...labora.co.uk>,
	Daniel Stone <daniels@...labora.com>,
	Riley Andrews <riandrews@...roid.com>,
	dri-devel <dri-devel@...ts.freedesktop.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Arve Hjønnevåg <arve@...roid.com>,
	John Harrison <John.C.Harrison@...el.com>
Subject: Re: [RFC v2 5/8] drm/fence: add in-fences support

On Thu, Apr 28, 2016 at 6:56 PM, Ville Syrjälä
<ville.syrjala@...ux.intel.com> wrote:
>>  - better for tracing, can identify the buffer/fence promptly
>
> Can fences be reused somehow while still attached to a plane, or ever?
> That might cause some oddness if you, say, leave a fence attached to one
> plane and then do a modeset on another crtc perhaps which needs to turn
> the first crtc off+on to reconfigure something.

Fences auto-disappear of course and don't stick around when you
duplicate the drm_plane_state again. I still don't really get the real
concerns though ... In the end it's purely a transport question, and
both ABI ideas work out semantically exactly the same in the end. It's
just that at least in my opinion FENCE_FD prop is a lot more
convenient.
-Daniel
-- 
Daniel Vetter
Software Engineer, Intel Corporation
+41 (0) 79 365 57 48 - http://blog.ffwll.ch