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

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Message-ID: <5355CF27.8000401@nvidia.com>
Date:	Tue, 22 Apr 2014 11:08:39 +0900
From:	Alexandre Courbot <acourbot@...dia.com>
To:	Ben Skeggs <skeggsb@...il.com>, 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: [PATCH v2 07/10] drm/nouveau/graph: pad firmware code at load
 time

On 04/22/2014 08:48 AM, Ben Skeggs wrote:
> 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.

Fixed, thanks!
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