linux-kernel - Re: [PATCH 8/9] dt-bindings: reserved-memory: MediaTek: Add reserved memory for SVP

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Date:   Mon, 20 Nov 2023 13:50:23 +0530
From:   Jaskaran Singh <quic_jasksing@...cinc.com>
To:     Yong Wu (吴勇) <Yong.Wu@...iatek.com>,
        "matthias.bgg@...il.com" <matthias.bgg@...il.com>,
        "christian.koenig@....com" <christian.koenig@....com>,
        "quic_vjitta@...cinc.com" <quic_vjitta@...cinc.com>,
        "robh+dt@...nel.org" <robh+dt@...nel.org>,
        "sumit.semwal@...aro.org" <sumit.semwal@...aro.org>
CC:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-mediatek@...ts.infradead.org" 
        <linux-mediatek@...ts.infradead.org>,
        "jstultz@...gle.com" <jstultz@...gle.com>,
        "linaro-mm-sig@...ts.linaro.org" <linaro-mm-sig@...ts.linaro.org>,
        "linux-media@...r.kernel.org" <linux-media@...r.kernel.org>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        Jianjiao Zeng (曾健姣) 
        <Jianjiao.Zeng@...iatek.com>,
        Kuohong Wang (王國鴻) 
        <kuohong.wang@...iatek.com>,
        "conor+dt@...nel.org" <conor+dt@...nel.org>,
        "Brian.Starkey@....com" <Brian.Starkey@....com>,
        "benjamin.gaignard@...labora.com" <benjamin.gaignard@...labora.com>,
        "tjmercier@...gle.com" <tjmercier@...gle.com>,
        "krzysztof.kozlowski+dt@...aro.org" 
        <krzysztof.kozlowski+dt@...aro.org>,
        "dri-devel@...ts.freedesktop.org" <dri-devel@...ts.freedesktop.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "angelogioacchino.delregno@...labora.com" 
        <angelogioacchino.delregno@...labora.com>
Subject: Re: [PATCH 8/9] dt-bindings: reserved-memory: MediaTek: Add reserved
 memory for SVP



On 11/6/2023 11:26 AM, Yong Wu (吴勇) wrote:
> On Wed, 2023-11-01 at 11:20 +0530, Jaskaran Singh wrote:
>>  	 
>> External email : Please do not click links or open attachments until
>> you have verified the sender or the content.
>>  On 10/20/2023 3:20 PM, Yong Wu (吴勇) wrote:
>>> On Thu, 2023-10-19 at 10:16 +0530, Vijayanand Jitta wrote:
>>>>   
>>>> Instead of having a vendor specific binding for cma area, How
>> about
>>>> retrieving
>>>>
>>>
>> https://lore.kernel.org/lkml/1594948208-4739-1-git-send-email-hayashi.kunihiko@socionext.com/
>>>>  ?
>>>> dma_heap_add_cma can just associate cma region and create a heap.
>> So,
>>>> we can reuse cma heap
>>>> code for allocation instead of replicating that code here.
>>>>
>>>
>>> Thanks for the reference. I guess we can't use it. There are two
>>> reasons:
>>>   
>>> a) The secure heap driver is a pure software driver and we have no
>>> device for it, therefore we cannot call dma_heap_add_cma.
>>>   
>>
>> Hi Yong,
>>
>> We're considering using struct cma as the function argument to
>> dma_heap_add_cma() rather than struct device. Would this help
>> resolve the problem of usage with dma_heap_add_cma()?
> 
> Yes. If we use "struct cma", I guess it works.
>

Great; I've posted a v2[1] for the API incorporating this change.

Thanks,
Jaskaran.

[1]
https://lore.kernel.org/lkml/20231117100337.5215-1-quic_jasksing@quicinc.com/