linux-kernel - Re: [PATCH v2 07/10] drm/nouveau/graph: pad firmware code at load time

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Message-ID: <CACAvsv7J7yUaug=CoUfsPg5PXf=ZmwUD9XvCt4CqAvnamQNN9A@mail.gmail.com>
Date:	Tue, 22 Apr 2014 09:48:03 +1000
From:	Ben Skeggs <skeggsb@...il.com>
To:	Ilia Mirkin <imirkin@...m.mit.edu>
Cc:	Alexandre Courbot <acourbot@...dia.com>,
	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: [PATCH v2 07/10] drm/nouveau/graph: pad firmware code at load time

On Tue, Apr 22, 2014 at 4:03 AM, Ilia Mirkin <imirkin@...m.mit.edu> wrote:
> On Mon, Apr 21, 2014 at 2:02 AM, Alexandre Courbot <acourbot@...dia.com> wrote:
>> Pad the microcode to a multiple of 0x40 bytes, otherwise firmware will
>
> bytes or u32's? From the code, I'm guessing the latter. (Similar
> concern about comment in the code.)
>
>> fail to run from non-prepadded firmware files.
>>
>> Signed-off-by: Alexandre Courbot <acourbot@...dia.com>
>> Reviewed-by: Thierry Reding <treding@...dia.com>
>> ---
>>  drivers/gpu/drm/nouveau/core/engine/graph/nvc0.c | 4 ++++
>>  1 file changed, 4 insertions(+)
>>
>> diff --git a/drivers/gpu/drm/nouveau/core/engine/graph/nvc0.c b/drivers/gpu/drm/nouveau/core/engine/graph/nvc0.c
>> index e5b75f189988..013475c62986 100644
>> --- a/drivers/gpu/drm/nouveau/core/engine/graph/nvc0.c
>> +++ b/drivers/gpu/drm/nouveau/core/engine/graph/nvc0.c
>> @@ -894,6 +894,10 @@ nvc0_graph_init_fw(struct nvc0_graph_priv *priv, u32 fuc_base,
>>                         nv_wr32(priv, fuc_base + 0x0188, i >> 6);
>>                 nv_wr32(priv, fuc_base + 0x0184, code->data[i]);
>>         }
>> +
>> +       /* code must be padded to 0x40 bytes */
>> +       for (; i & 0x3f; i++)
>> +               nv_wr32(priv, fuc_base + 0x0184, 0);
It's 256 bytes indeed.

>>  }
>>
>>  static void
>> --
>> 1.9.2
>>
>> _______________________________________________
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>> dri-devel@...ts.freedesktop.org
>> http://lists.freedesktop.org/mailman/listinfo/dri-devel
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