linux-kernel - Re: [PATCH 1/1] iommu/arm-smmu-v3: add support for BBML

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Message-ID: <32f4752f-6954-183a-a0c1-b5d719c85b67@huawei.com>
Date:   Wed, 27 Jan 2021 15:36:08 +0800
From:   Keqian Zhu <zhukeqian1@...wei.com>
To:     Will Deacon <will@...nel.org>, Robin Murphy <robin.murphy@....com>
CC:     "Leizhen (ThunderTown)" <thunder.leizhen@...wei.com>,
        "Jean-Philippe Brucker" <jean-philippe@...aro.org>,
        Joerg Roedel <joro@...tes.org>,
        "Yang Yingliang" <yangyingliang@...wei.com>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        iommu <iommu@...ts.linux-foundation.org>,
        Jonathan Cameron <Jonathan.Cameron@...wei.com>,
        linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH 1/1] iommu/arm-smmu-v3: add support for BBML

On 2021/1/27 10:01, Leizhen (ThunderTown) wrote:
> 
> 
> On 2021/1/26 18:12, Will Deacon wrote:
>> On Mon, Jan 25, 2021 at 08:23:40PM +0000, Robin Murphy wrote:
>>> Now we probably will need some degreee of BBML feature awareness for the
>>> sake of SVA if and when we start using it for CPU pagetables, but I still
>>> cannot see any need to consider it in io-pgtable.
>>
>> Agreed; I don't think this is something that io-pgtable should have to care
>> about.
Hi,

I have a question here :-).
If the old table is not live, then the break procedure seems unnecessary. Do I miss something?

Thanks,
Keqian

> 
> Yes, the SVA works in stall mode, and the failed device access requests are not
> discarded.
> 
> Let me look for examples. The BBML usage scenario was told by a former colleague.
> 
>>
>> Will
>>
>> .
>>
> 
> 
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> linux-arm-kernel@...ts.infradead.org
> http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
> .
> 

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