linux-kernel - Re: [Nouveau] [PATCH 11/12] drm/nouveau: support GK20A in nouveau_accel

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Date:	Thu, 3 Apr 2014 09:14:48 +1000
From:	Ben Skeggs <skeggsb@...il.com>
To:	Ilia Mirkin <imirkin@...m.mit.edu>
Cc:	Alexandre Courbot <gnurou@...il.com>,
	"nouveau@...ts.freedesktop.org" <nouveau@...ts.freedesktop.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"dri-devel@...ts.freedesktop.org" <dri-devel@...ts.freedesktop.org>,
	Ben Skeggs <bskeggs@...hat.com>,
	"linux-tegra@...r.kernel.org" <linux-tegra@...r.kernel.org>
Subject: Re: [Nouveau] [PATCH 11/12] drm/nouveau: support GK20A in nouveau_accel_init()

On Thu, Apr 3, 2014 at 12:23 AM, Ilia Mirkin <imirkin@...m.mit.edu> wrote:
> On Wed, Apr 2, 2014 at 10:14 AM, Alexandre Courbot <gnurou@...il.com> wrote:
>>>>> +     /* Need to figure out how to handle sw for gk20a */
>>>>> +     if (device->chipset == 0xea)
>>>>> +             goto skip_sw_init;
>>>>
>>>> The commit message makes it sound like SW isn't needed since gk20a
>>>> "lacks any display hardware". In that case the comment here doesn't make
>>>> much sense.
>>
>> Correct. As far as I have looked (that is, not very far), SW methods
>> are used for display-related functions, but there might be other
>> use-cases too. Maybe someone who knows better can confirm?
>
> http://cgit.freedesktop.org/~darktama/nouveau/tree/nvkm/engine/software/nvc0.c
>
> Take a look at nvc0_software_mthd_mp_control -- that's used in the
> mesa driver to... well, control those things :) They're related to
> PGRAPH, which should be available on the GK20A. [Not sure what they do
> though. One of them is about turning off error reporting.]
Hm, I don't know why I didn't notice that was there for now.. I
wouldn't be entirely surprised if nvidia had reserved method ids in
the 3d object class that were supposed to be used for this, rather
than from a sw object class..

>
>   -ilia
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