linux-kernel - Re: [PATCH 0/7] de-stage SW

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Message-ID: <20160808190812.GN2484@joana>
Date:	Mon, 8 Aug 2016 16:08:12 -0300
From:	Gustavo Padovan <gustavo.padovan@...labora.com>
To:	Pavel Machek <pavel@....cz>
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Gustavo Padovan <gustavo@...ovan.org>,
	linux-kernel@...r.kernel.org, devel@...verdev.osuosl.org,
	dri-devel@...ts.freedesktop.org,
	Daniel Stone <daniels@...labora.com>,
	Arve Hjønnevåg <arve@...roid.com>,
	Riley Andrews <riandrews@...roid.com>,
	Daniel Vetter <daniel.vetter@...ll.ch>,
	Rob Clark <robdclark@...il.com>,
	Greg Hackmann <ghackmann@...gle.com>,
	John Harrison <John.C.Harrison@...el.com>,
	Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
	Sumit Semwal <sumit.semwal@...aro.org>,
	Gustavo Padovan <gustavo.padovan@...labora.co.uk>
Subject: Re: [PATCH 0/7] de-stage SW_SYNC validation frawework

2016-08-07 Pavel Machek <pavel@....cz>:

> On Sun 2016-07-24 15:21:11, Greg Kroah-Hartman wrote:
> > On Mon, Jul 18, 2016 at 04:12:45PM -0300, Gustavo Padovan wrote:
> > > Hi,
> > > 
> > > Do you think there is time to get this in for 4.8?
> > 
> > No, it was too late on my end, due to travel and vacation, sorry.  I'll
> > queue it up for 4.9-rc1.
> 
> Could we get some documentation what this does? Is it visilble to
> userspace?

This interface is only intended for testing and validation, there are
ioctls on the debugfs file that can be accessed by userspace but there
isn't any exported kernel header with this info. The tester should know
and add a internal header to be able to access it. We want to prevent
people from misusing this feature by not advertising it nor providing
documentation.

There will be, though, kselftest for this interface, that I send out
once SW_SYNC is de-staged.