[Mesa-dev] [PATCH] nvc0: enable compute support on Fermi

[Hans de Goede]

Hi,

On 06-11-15 00:51, Samuel Pitoiset wrote:
>
>
> On 11/06/2015 12:43 AM, Ilia Mirkin wrote:
>> On Thu, Nov 5, 2015 at 6:41 PM, Samuel Pitoiset
>> <samuel.pitoiset at gmail.com> wrote:
>>> Altough the compute support is still not complete because textures and
>>> surfaces need to be implemented, it allows to launch very simple compute
>>> kernel like one which reads reading MP performance counters.
>>
>> Didn't those end up breaking 3d rendering? Have you figured out what
>> was overwriting what?
>
> This doesn't break any stuff related to 3D rendering. The compute kernel for reading perf counters has been tested a lot on different chips.
>
> The compute support is already enabled on Kepler and it doesn't seem to break 3D rendering, btw.
>
> In the series which fixed those perf counters, I actually introduced a bug which has been fixed since: fc5ae0c13f71f049065b1422c20491d2264ae164
>
>>
>>>
>>> This turns on PIPE_CAP_COMPUTE and PIPE_SHADER_COMPUTE.
>>>
>>> Signed-off-by: Samuel Pitoiset <samuel.pitoiset at gmail.com>
>>> ---
>>>   src/gallium/drivers/nouveau/nvc0/nvc0_screen.c | 4 +---
>>>   1 file changed, 1 insertion(+), 3 deletions(-)
>>>
>>> diff --git a/src/gallium/drivers/nouveau/nvc0/nvc0_screen.c b/src/gallium/drivers/nouveau/nvc0/nvc0_screen.c
>>> index 7d96977..5b7b39b 100644
>>> --- a/src/gallium/drivers/nouveau/nvc0/nvc0_screen.c
>>> +++ b/src/gallium/drivers/nouveau/nvc0/nvc0_screen.c
>>> @@ -186,7 +186,7 @@ nvc0_screen_get_param(struct pipe_screen *pscreen, enum pipe_cap param)
>>>      case PIPE_CAP_SEAMLESS_CUBE_MAP_PER_TEXTURE:
>>>         return (class_3d >= NVE4_3D_CLASS) ? 1 : 0;
>>>      case PIPE_CAP_COMPUTE:
>>> -      return (class_3d == NVE4_3D_CLASS) ? 1 : 0;
>>> +      return 1;
>>
>> Of course this also enables it for NVF0_3D_CLASS. Pretty sure compute
>> doesn't work there for some dumb reason (like we're missing some in
>> our ctxsw fw...)

Hmm, my only compute capable card actually is a nvf0 card (gk208 based). Can you
provide some quick test instructions how I can test compute on that card
(with the patch from this thread applied) ?

And if it does not work, any suggestions how to go about debugging this ?
Or better any info I can provide to help you debug this :)

Regards,

Hans