linux-kernel - Re: [RFC PATCH 4/6] iommu/arm-smmu-v3: Add SVM support for platform devices

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Message-ID: <b0c8ca8f-8d12-5438-91e1-6c984d9debb9@huawei.com>
Date:   Wed, 6 Sep 2017 09:20:32 +0800
From:   Yisheng Xie <xieyisheng1@...wei.com>
To:     Bob Liu <liubo95@...wei.com>,
        Jean-Philippe Brucker <jean-philippe.brucker@....com>
CC:     <joro@...tes.org>, <robh+dt@...nel.org>, <mark.rutland@....com>,
        <lorenzo.pieralisi@....com>, <hanjun.guo@...aro.org>,
        <sudeep.holla@....com>, <rjw@...ysocki.net>, <lenb@...nel.org>,
        <will.deacon@....com>, <robin.murphy@....com>,
        <robert.moore@...el.com>, <lv.zheng@...el.com>,
        <iommu@...ts.linux-foundation.org>, <devicetree@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, <linux-acpi@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>, <devel@...ica.org>,
        <chenjiankang1@...wei.com>, <xieyisheng@...wei.com>
Subject: Re: [RFC PATCH 4/6] iommu/arm-smmu-v3: Add SVM support for platform
 devices

Hi Jean-Philippe,

On 2017/9/6 8:51, Bob Liu wrote:
> On 2017/9/5 20:53, Jean-Philippe Brucker wrote:
>> On 31/08/17 09:20, Yisheng Xie wrote:
>>> From: Jean-Philippe Brucker <jean-philippe.brucker@....com>
>>>
>>> Platform device can realise SVM function by using the stall mode. That
>>> is to say, when device access a memory via iova which is not populated,
>>> it will stalled and when SMMU try to translate this iova, it also will
>>> stall and meanwhile send an event to CPU via MSI.
>>>
>>> After SMMU driver handle the event and populated the iova, it will send
>>> a RESUME command to SMMU to exit the stall mode, therefore the platform
>>> device can contiue access the memory.
>>>
>>> Signed-off-by: Jean-Philippe Brucker <jean-philippe.brucker@....com>
>>
>> No. Please don't forge a signed-off-by under a commit message you wrote,

Sorry about that, it is my mistake.

> 
> Really sorry for that.
> We sent out the wrong version, I should take more careful review.
> 
> Regards,
> Liubo
> 
>> it's rude. I didn't sign it, didn't consider it fit for mainline or even
>> as an RFC, and wanted to have another read before sending. My mistake,
>> I'll think twice before sharing prototypes in the future.
>>
>> Thanks,
>> Jean
>>
> 
> 
> 
> 
> .
>