linux-kernel - Re: [PATCH 09/83] hsa/radeon: Add code base of hsa driver for AMD's GPUs

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Message-ID: <20140711185138.GN1870@gmail.com>
Date:	Fri, 11 Jul 2014 14:51:40 -0400
From:	Jerome Glisse <j.glisse@...il.com>
To:	"Bridgman, John" <John.Bridgman@....com>
Cc:	Oded Gabbay <oded.gabbay@...il.com>,
	David Airlie <airlied@...ux.ie>,
	"Deucher, Alexander" <Alexander.Deucher@....com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"dri-devel@...ts.freedesktop.org" <dri-devel@...ts.freedesktop.org>,
	"Lewycky, Andrew" <Andrew.Lewycky@....com>,
	Joerg Roedel <joro@...tes.org>,
	"Gabbay, Oded" <Oded.Gabbay@....com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	"Rafael J. Wysocki" <rafael.j.wysocki@...el.com>,
	Kishon Vijay Abraham I <kishon@...com>,
	Sandeep Nair <sandeep_n@...com>,
	Kenneth Heitke <kheitke@...eaurora.org>,
	Srinivas Pandruvada <srinivas.pandruvada@...ux.intel.com>,
	Santosh Shilimkar <santosh.shilimkar@...com>,
	Andreas Noever <andreas.noever@...il.com>,
	Lucas Stach <l.stach@...gutronix.de>,
	Philipp Zabel <p.zabel@...gutronix.de>
Subject: Re: [PATCH 09/83] hsa/radeon: Add code base of hsa driver for AMD's
 GPUs

On Fri, Jul 11, 2014 at 06:46:30PM +0000, Bridgman, John wrote:
> >From: Jerome Glisse [mailto:j.glisse@...il.com]
> >Sent: Friday, July 11, 2014 2:11 PM
> >To: Bridgman, John
> >Cc: Oded Gabbay; David Airlie; Deucher, Alexander; linux-
> >kernel@...r.kernel.org; dri-devel@...ts.freedesktop.org; Lewycky, Andrew;
> >Joerg Roedel; Gabbay, Oded; Greg Kroah-Hartman; Rafael J. Wysocki; Kishon
> >Vijay Abraham I; Sandeep Nair; Kenneth Heitke; Srinivas Pandruvada;
> >Santosh Shilimkar; Andreas Noever; Lucas Stach; Philipp Zabel
> >Subject: Re: [PATCH 09/83] hsa/radeon: Add code base of hsa driver for
> >AMD's GPUs
> >
> >On Fri, Jul 11, 2014 at 06:02:39PM +0000, Bridgman, John wrote:
> >> >From: Jerome Glisse [mailto:j.glisse@...il.com]
> >> >Sent: Friday, July 11, 2014 1:04 PM
> >> >To: Oded Gabbay
> >> >Cc: David Airlie; Deucher, Alexander; linux-kernel@...r.kernel.org;
> >> >dri- devel@...ts.freedesktop.org; Bridgman, John; Lewycky, Andrew;
> >> >Joerg Roedel; Gabbay, Oded; Greg Kroah-Hartman; Rafael J. Wysocki;
> >> >Kishon Vijay Abraham I; Sandeep Nair; Kenneth Heitke; Srinivas
> >> >Pandruvada; Santosh Shilimkar; Andreas Noever; Lucas Stach; Philipp
> >> >Zabel
> >> >Subject: Re: [PATCH 09/83] hsa/radeon: Add code base of hsa driver
> >> >for AMD's GPUs
> >> >
> >> >On Fri, Jul 11, 2014 at 12:50:09AM +0300, Oded Gabbay wrote:
> >> >> This patch adds the code base of the hsa driver for AMD's GPUs.
> >> >>
> >> >> This driver is called kfd.
> >> >>
> >> >> This initial version supports the first HSA chip, Kaveri.
> >> >>
> >> >> This driver is located in a new directory structure under drivers/gpu.
> >> >>
> >> >> Signed-off-by: Oded Gabbay <oded.gabbay@....com>
> >> >
> >> >There is too coding style issues. While we have been lax on the
> >> >enforcing the scripts/checkpatch.pl rules i think there is a limit to
> >> >that. I am not strict on the 80chars per line but others things needs fixing
> >so we stay inline.
> >> >
> >> >Also i am a bit worried about the license, given top comment in each
> >> >of the files i am not sure this is GPL2 compatible. I would need to
> >> >ask lawyer to review that.
> >> >
> >>
> >> Hi Jerome,
> >>
> >> Which line in the license are you concerned about ? In theory we're using
> >the same license as the initial code pushes for radeon, and I just did a side-by
> >side compare with the license header on cik.c in the radeon tree and
> >confirmed that the two licenses are identical.
> >>
> >> The cik.c header has an additional "Authors:" line which the kfd files do
> >not, but AFAIK that is not part of the license text proper.
> >>
> >
> >You can not claim GPL if you want to use this license. radeon is weird best for
> >historical reasons as we wanted to share code with BSD thus it is dual
> >licensed and this is reflected with :
> >MODULE_LICENSE("GPL and additional rights");
> >
> >inside radeon_drv.c
> >
> >So if you want to have MODULE_LICENSE(GPL) then you should have header
> >that use the GPL license wording and no wording from BSD like license.
> >Otherwise change the MODULE_LICENSE and it would also be good to say
> >dual licensed at top of each files (or least next to each license) so that it is
> >clear this is BSD & GPL license.
> 
> Got it. Missed that we had a different MODULE_LICENSE.
> 
> Since the goal is license compatibility with radeon so we can update the interface and move code between the drivers in future I guess my preference would be to update MODULE_LICENSE in the kfd code to "GPL and additional rights", do you think that would be OK ?

I am not a lawyer and nothing that i said should be considered as legal
advice (on the contrary ;)) I think you need to be more clear with each
license to clear says GPLv2 or BSD ie dual licensed but the dual license
is a beast you would definitly want to talk to lawyer about.

Cheers,
Jérôme
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