linux-kernel - Re: [Nouveau] [PATCH 03/12] drm/nouveau/bar: only ioremap BAR3 if it exists

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Message-ID: <CACAvsv6USpTOe4H3fhabHbPOmjSV8VeQWakVCkQS6doqPed6fQ@mail.gmail.com>
Date:	Wed, 26 Mar 2014 14:20:42 +1000
From:	Ben Skeggs <skeggsb@...il.com>
To:	Thierry Reding <thierry.reding@...il.com>
Cc:	Alexandre Courbot <acourbot@...dia.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 03/12] drm/nouveau/bar: only ioremap BAR3 if it exists

On Tue, Mar 25, 2014 at 8:13 AM, Thierry Reding
<thierry.reding@...il.com> wrote:
> On Mon, Mar 24, 2014 at 05:42:25PM +0900, Alexandre Courbot wrote:
>> Some chips that use system memory exclusively (e.g. GK20A) do not
>> expose 2 BAR regions. For them only BAR1 exists, and it should be used
>> for USERD mapping. Do not map BAR3 if its resource does not exist.
>>
>> Signed-off-by: Alexandre Courbot <acourbot@...dia.com>
>> ---
>>  drivers/gpu/drm/nouveau/core/subdev/bar/base.c | 7 +++++--
>>  1 file changed, 5 insertions(+), 2 deletions(-)
>>
>> diff --git a/drivers/gpu/drm/nouveau/core/subdev/bar/base.c b/drivers/gpu/drm/nouveau/core/subdev/bar/base.c
>> index bdf594116f3f..d713eeb75b13 100644
>> --- a/drivers/gpu/drm/nouveau/core/subdev/bar/base.c
>> +++ b/drivers/gpu/drm/nouveau/core/subdev/bar/base.c
>> @@ -110,6 +110,7 @@ nouveau_bar_create_(struct nouveau_object *parent,
>>  {
>>       struct nouveau_device *device = nv_device(parent);
>>       struct nouveau_bar *bar;
>> +     bool has_bar3 = nv_device_resource_len(device, 3) != 0;
>
> I don't think this variable is really necessary since you only use the
> expression once anyway, but I don't feel very strongly about it, so
> either way:
I'd also prefer it folded in, but it's not a big deal.  A couple of
other upcoming comments will require a re-spin anyway, so we may as
well :)

>
> Reviewed-by: Thierry Reding <treding@...dia.com>
>
> _______________________________________________
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> Nouveau@...ts.freedesktop.org
> http://lists.freedesktop.org/mailman/listinfo/nouveau
>
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