linux-kernel - Re: [Nouveau] [PATCH v2 09/10] drm/nouveau: support GK20A in nouveau_accel_init()

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Message-ID: <5355D485.6030301@nvidia.com>
Date:	Tue, 22 Apr 2014 11:31:33 +0900
From:	Alexandre Courbot <acourbot@...dia.com>
To:	Ilia Mirkin <imirkin@...m.mit.edu>
CC:	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: [Nouveau] [PATCH v2 09/10] drm/nouveau: support GK20A in nouveau_accel_init()

On 04/22/2014 03:07 AM, Ilia Mirkin wrote:
> On Mon, Apr 21, 2014 at 2:02 AM, Alexandre Courbot <acourbot@...dia.com> wrote:
>> Skip the creation of a software channel for GK20A as software methods
>> are not yet supported.
>
> How is GK20A different from a nvc0+ card that lacks PDISPLAY (like all
> the 3D Controller ones, and I guess even some that come up as VGA
> controller in PCI but don't have any outputs in their VBIOS)? i.e.
> what's wrong with just doing the same thing that GK1xx does? Note that
> there are sw methods that don't deal with display as well.

Well, as it turns out... I have tried reverting this patch and enabling 
nvc0_software_oclass for GK20A and things worked like a charm. 0_o

This is definitely different from when I first drafted this patch 
series, where a software class could not be used on GK20A due to hard 
dependencies on display. But it seems like today's code can accommodate 
much better with that situation.

That's great - this will allow us to get rid of this ungraceful patch. 
Thanks for making me check it again.

Probably a v3 will be necessary to enable the software class in patch 10 
(and fix the byte/word typo in patch 7). I will just wait a bit to see 
if this v2 gets more comments before sending it.

>
>    -ilia
>
>>
>> Signed-off-by: Alexandre Courbot <acourbot@...dia.com>
>> ---
>>   drivers/gpu/drm/nouveau/nouveau_drm.c | 5 +++++
>>   1 file changed, 5 insertions(+)
>>
>> diff --git a/drivers/gpu/drm/nouveau/nouveau_drm.c b/drivers/gpu/drm/nouveau/nouveau_drm.c
>> index ddd83756b9a2..5b46148ffd32 100644
>> --- a/drivers/gpu/drm/nouveau/nouveau_drm.c
>> +++ b/drivers/gpu/drm/nouveau/nouveau_drm.c
>> @@ -208,6 +208,10 @@ nouveau_accel_init(struct nouveau_drm *drm)
>>                  return;
>>          }
>>
>> +       /* Need to figure out how to handle sw for gk20a */
>> +       if (device->chipset == 0xea)
>> +               goto skip_sw_init;
>> +
>>          ret = nouveau_object_new(nv_object(drm), NVDRM_CHAN, NVDRM_NVSW,
>>                                   nouveau_abi16_swclass(drm), NULL, 0, &object);
>>          if (ret == 0) {
>> @@ -234,6 +238,7 @@ nouveau_accel_init(struct nouveau_drm *drm)
>>                  return;
>>          }
>>
>> +skip_sw_init:
>>          if (device->card_type < NV_C0) {
>>                  ret = nouveau_gpuobj_new(drm->device, NULL, 32, 0, 0,
>>                                          &drm->notify);
>> --
>> 1.9.2
>>
>> _______________________________________________
>> Nouveau mailing list
>> Nouveau@...ts.freedesktop.org
>> http://lists.freedesktop.org/mailman/listinfo/nouveau

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