[Nouveau] GM206 support?

[Ilia Mirkin]

On Tue, Mar 17, 2015 at 6:40 PM, Andy Lutomirski <luto at amacapital.net> wrote:
> On Tue, Mar 17, 2015 at 2:57 PM, Ilia Mirkin <imirkin at alum.mit.edu> wrote:
>> On Tue, Mar 17, 2015 at 5:52 PM, Andy Lutomirski <luto at amacapital.net> wrote:
>>> On Fri, Feb 13, 2015 at 9:52 PM, Ilia Mirkin <imirkin at alum.mit.edu> wrote:
>>>> On Fri, Feb 13, 2015 at 8:59 PM, Andy Lutomirski <luto at amacapital.net> wrote:
>>>>> My new GTX 960 (GM206, I think) says:
>>>>>
>>>>> [   10.329351] nouveau ![  DEVICE][0000:09:00.0] unknown Maxwell chipset
>>>>> [   10.329355] nouveau E[  DEVICE][0000:09:00.0] unknown chipset, 0x126010a1
>>>>> [   10.329356] nouveau E[     DRM] failed to create 0x00000080, -22
>>>>> [   10.330129] nouveau: probe of 0000:09:00.0 failed with error -22
>>>>>
>>>>> Hacking up nouveau so that it treats it like a GM204 doesn't work.
>>>>
>>>> What happens if you just drop the 0x126 next to the 0x124 in
>>>> engine/device/gm100.c ?
>>>>
>>>>> Are there any near-term plans to support this card?
>>>>
>>>> I don't know of anyone with the hw... maybe Ben got one? If you're
>>>> interested in helping, the kernel logs from the above experiment + an
>>>> mmiotrace of the blob drivers (see
>>>> https://wiki.ubuntu.com/X/MMIOTracing) + vbios (see
>>>> http://nouveau.freedesktop.org/wiki/DumpingVideoBios/).
>>>>
>>>> I assume you're on a recent kernel? You need 3.19 for the GM204 stuff
>>>> to work in the first place.
>>>
>>> Neither 3.19 nor 4.0-rcsomething works.
>>>
>>> I put an mmio trace (X startup and glxgears) and a vbios dump here:
>>>
>>> http://web.mit.edu/luto/www/GM206/
>>
>> Stefan sent proper patches to get nouveau going on his GM206, which
>> will make it into the next 4.0-rc. Here is a tree that is destined
>> towards drm-fixes:
>>
>> http://cgit.freedesktop.org/nouveau/linux-2.6/log/?h=linux-4.0
>>
>> Let us know if it makes the card work. (Definitely no acceleration
>> without signed firmware for now though.)
>
> The driver loads and seems to work.

Excellent!

> The nouveau X driver doesn't load, though.

Yeah, xf86-video-nouveau has no support for the GM20x family? Note
that even if it did load, you wouldn't get any acceleration -- may as
well just use the 'xf86-video-modesetting' driver.

>
> I tried to use the nvidia firmware:
>

[...]

>
> with:
>
> options nouveau config=NvGrUseFW=1
>
> in my modprobe configuration, and that made no obvious difference,
> even in the kernel logs.

Right, that's expected. GM20x requires signed firmware. We haven't
even gotten as far as being able to figure out what all the
*proprietary* firmware is, never mind even loading it. It doesn't show
up in mmiotraces, probably read by the card directly out of system
memory. It's a multi-stage process, complicating RE. The firmware that
you've extracted is exclusively for video decoding acceleration. You
could extract firmware from 325.15 which will include the pgraph fuc
blobs too [which would get loaded by NvGrUseFW=1], but nothing that'll
help you.

Cheers,

  -ilia