linux-kernel - Re: [PATCH] iommu: Add device name to iommu map/unmap trace events

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Date:   Tue, 6 Apr 2021 14:56:53 +0800
From:   "chenxiang (M)" <chenxiang66@...ilicon.com>
To:     Joerg Roedel <joro@...tes.org>,
        Sai Prakash Ranjan <saiprakash.ranjan@...eaurora.org>
CC:     Will Deacon <will@...nel.org>, <linux-kernel@...r.kernel.org>,
        <iommu@...ts.linux-foundation.org>,
        <linux-arm-msm@...r.kernel.org>,
        "Robin Murphy" <robin.murphy@....com>,
        <linux-arm-kernel@...ts.infradead.org>, <linuxarm@...wei.com>
Subject: Re: [PATCH] iommu: Add device name to iommu map/unmap trace events

Hi,

在 2021/2/12 18:50, Joerg Roedel 写道:
> On Tue, Feb 09, 2021 at 06:06:20PM +0530, Sai Prakash Ranjan wrote:
>> diff --git a/include/linux/iommu.h b/include/linux/iommu.h
>> index 5e7fe519430a..6064187d9bb6 100644
>> --- a/include/linux/iommu.h
>> +++ b/include/linux/iommu.h
>> @@ -87,6 +87,7 @@ struct iommu_domain {
>>   	void *handler_token;
>>   	struct iommu_domain_geometry geometry;
>>   	void *iova_cookie;
>> +	char dev_name[32];
>>   };
> No, definitly not. A domain is a device DMA address space which can be
> used by more than one device. Just look at IOMMU groups with more than
> one member device, in this case just one device name would be very
> misleading.

Is it possible to use group id to identify different domains?

>
> Regards,
>
> 	Joerg
> _______________________________________________
> iommu mailing list
> iommu@...ts.linux-foundation.org
> https://lists.linuxfoundation.org/mailman/listinfo/iommu
>
> .
>

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