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

[Oded Gabbay <oded.gabbay@amd.com>]

On 11/07/14 22:22, Jerome Glisse wrote:
> On Fri, Jul 11, 2014 at 06:56:12PM +0000, Bridgman, John wrote:
>>> From: Jerome Glisse [mailto:j.glisse@gmail.com]
>>> Sent: Friday, July 11, 2014 2:52 PM
>>> To: Bridgman, John
>>> Cc: Oded Gabbay; David Airlie; Deucher, Alexander; linux-
>>> kernel@vger.kernel.org; dri-devel@lists.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 06:46:30PM +0000, Bridgman, John wrote:
>>>>> From: Jerome Glisse [mailto:j.glisse@gmail.com]
>>>>> Sent: Friday, July 11, 2014 2:11 PM
>>>>> To: Bridgman, John
>>>>> Cc: Oded Gabbay; David Airlie; Deucher, Alexander; linux-
>>>>> kernel@vger.kernel.org; dri-devel@lists.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@gmail.com]
>>>>>>> Sent: Friday, July 11, 2014 1:04 PM
>>>>>>> To: Oded Gabbay
>>>>>>> Cc: David Airlie; Deucher, Alexander;
>>>>>>> linux-kernel@vger.kernel.org;
>>>>>>> dri- devel@lists.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@amd.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.
>>
>> Yeah, dual license seems horrid in its implications for developers so we've always tried to avoid it. GPL hurts us for porting to other OSes so the X11 / "GPL with additional rights" combo seemed like the ideal solution and we made it somewhat of a corporate standard. Hope that doesn't come back to haunt us.
>>
>> Meditate on this I will. Thanks !
>
> Just to be explicit, my point is that is you claim GPL in MODULE_LICENSE
> then this is a GPL licensed code, if you claim GPL with additional rights
> than this is dual licensed code. This is how i read and interpret this
> with additional rights. In all the case the radeon code is considered
> dual license ie GPL+BSD (at least this is how i consider that code).
>
> Cheers,
> Jérôme
>
Changed it to "GPL and additional rights" in v2 of the patchset

	Oded