[Nouveau] [PATCH v2] nouveau: add coherent BO attribute

[Martin Peres]

On 26/05/2015 16:23, Alexandre Courbot wrote:
> On Sun, May 24, 2015 at 3:26 PM, Maarten Lankhorst
> <maarten at mblankhorst.nl> wrote:
>> Op 23-05-15 om 08:45 schreef Alexandre Courbot:
>>> On Fri, May 22, 2015 at 3:23 AM, Martin Peres <martin.peres at free.fr> wrote:
>>>> On 21/05/2015 11:47, Ben Skeggs wrote:
>>>>> On 21 May 2015 at 16:08, Alexandre Courbot <acourbot at nvidia.com> wrote:
>>>>>> Add a flag allowing Nouveau to specify that an object should be coherent
>>>>>> at allocation time. This is required for some class of objects like
>>>>>> fences which are randomly-accessed by both the CPU and GPU. This flag
>>>>>> instructs the kernel driver to make sure the object remains coherent
>>>>>> even on architectures for which coherency is not guaranteed by the bus.
>>>>>>
>>>>>> Signed-off-by: Alexandre Courbot <acourbot at nvidia.com>
>>>>> Reviewed-by: Ben Skeggs <bskeggs at redhat.com>
>>>> Pushed!
>>> Thanks! Should we also bump the ABI version or something?
>> If you mean changing libdrm_nouveau.so.2 to .so.3 no! If you mean having something that pkg-config can pick up that's done automatically on every drm release.
> Sorry for not having been clear. I was talking about checking against
> the driver version to ensure it supports all the features that libdrm
> can throw at it. We increased the modules's version to 1.2.2 when
> adding the coherent flag:
>
> drm/nouveau/nouveau_drm.h:
>   * 1.2.2:
>   *      - add NOUVEAU_GEM_DOMAIN_COHERENT flag

That will be the job of mesa to check the DRM version, I would guess.