linux-kernel - Re: [PATCH v2 0/4] drm/nvdla: Add driver support for NVDLA

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Message-ID: <aa55c03c-6d22-9718-a2a5-28d9ce114954@nvidia.com>
Date:   Thu, 28 Apr 2022 17:35:56 +0100
From:   Jon Hunter <jonathanh@...dia.com>
To:     Mikko Perttunen <cyndis@...si.fi>,
        Thierry Reding <thierry.reding@...il.com>,
        Cai Huoqing <cai.huoqing@...ux.dev>
Cc:     Thomas Zimmermann <tzimmermann@...e.de>,
        David Airlie <airlied@...ux.ie>, linux-kernel@...r.kernel.org,
        Christian König <christian.koenig@....com>,
        linaro-mm-sig@...ts.linaro.org, dri-devel@...ts.freedesktop.org,
        Sumit Semwal <sumit.semwal@...aro.org>,
        linux-media@...r.kernel.org, linux-tegra@...r.kernel.org
Subject: Re: [PATCH v2 0/4] drm/nvdla: Add driver support for NVDLA


On 28/04/2022 16:56, Mikko Perttunen wrote:
> On 4/28/22 17:10, Thierry Reding wrote:
>> On Tue, Apr 26, 2022 at 02:07:57PM +0800, Cai Huoqing wrote:
>>> The NVIDIA Deep Learning Accelerator (NVDLA) is an open source IP
>>> which is integrated into NVIDIA Jetson AGX Xavier,
>>> so add driver support for this accelerator."
>>
>> Hi,
>>
>> nice to see this work going on. For subsequent revisions, can you please
>> also Cc the Tegra mailing list (linux-tegra@...r.kernel.org) as well as
>> the Tegra platform maintainers (that's Jon Hunter and myself). This will
>> make sure that more people with an interest in this will see your work.
>> Not everyone follows dri-devel, linaro-mm-sig or linux-media.
>>
>> Thanks,
>> Thierry
> 
>  From a quick glance it looks like this driver pokes DLA hardware 
> directly which is not the intended programming model on Tegra hardware 
> (there are Falcon microcontrollers that offload task scheduling and 
> synchronization from the CPU). The hardware is also behind the Host1x 
> bus so a simple platform device is not sufficient.
> 
> Was this driver developed against some platform with OpenDLA hardware 
> (i.e. not Tegra)?
> 
> If so, we'd need to verify if the hardware matches the hardware in 
> Tegra194. Also, this driver may not be ideal for Tegra platforms since 
> we would lack the hardware scheduling and synchronization facilities. It 
> is likely necessary to have separate drivers for OpenDLA and Tegra's DLA 
> integration.


I believe that this is derived from the following github project ...

https://github.com/nvdla/sw

Jon

-- 
nvpublic