linux-kernel - Re: [PATCH 10/12] drm/nouveau/graph: add GK20A support

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Message-ID: <CAAVeFuLimi8Mzmqs0Y1OQv6ZJxgQd6Y2bfyF7hmP5_wcPya-gA@mail.gmail.com>
Date:	Wed, 2 Apr 2014 23:03:19 +0900
From:	Alexandre Courbot <gnurou@...il.com>
To:	Ben Skeggs <skeggsb@...il.com>
Cc:	Alexandre Courbot <acourbot@...dia.com>,
	Ben Skeggs <bskeggs@...hat.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>,
	"linux-tegra@...r.kernel.org" <linux-tegra@...r.kernel.org>
Subject: Re: [PATCH 10/12] drm/nouveau/graph: add GK20A support

On Wed, Mar 26, 2014 at 1:24 PM, Ben Skeggs <skeggsb@...il.com> wrote:
> On Mon, Mar 24, 2014 at 6:42 PM, Alexandre Courbot <acourbot@...dia.com> wrote:
>> Add a GR device for GK20A based on NVE4, with the correct classes
>> definitions (GK20A's 3D class is 0xa297).
>>
>> Most of the NVE4 code can be used on GK20A, so make relevant bits of
>> NVE4 available to other chips as well.
> This will need a bit of a rebase on top of the tree I mentioned
> earlier (also queued for drm-next now), where I've further split out
> and named the various chunks of state.

Will do that.

>
> Does GK104 match entirely correctly, or just happen to work?  I could
> probably hunt down the GK20A netlist images and check that actually :)

Do you mean, the init sequence? I haven't checked in detail (we are
certainly doing things differently in the non-DRM driver), but the
registers seem to match and the GPU is able to render after that. I
admit I have not looked much further for now.

The only register that does not exist on GK20A is 0x260, but when
accessing it Nouveau will be able to continue unharmed after a memory
fault.
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