linux-kernel - Re: [PATCH v2 5/8] iommu/amd: Add support for device id user input

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Message-ID: <1c26ea42-43f7-4b0f-a4c2-7c1edbf664a1@amd.com>
Date: Wed, 15 Jan 2025 10:51:51 +0530
From: "Srivastava, Dheeraj Kumar" <dheerajkumar.srivastava@....com>
To: Bjorn Helgaas <helgaas@...nel.org>
Cc: joro@...tes.org, suravee.suthikulpanit@....com, will@...nel.org,
 robin.murphy@....com, linux-kernel@...r.kernel.org, iommu@...ts.linux.dev,
 vasant.hegde@....com
Subject: Re: [PATCH v2 5/8] iommu/amd: Add support for device id user input

On 11/27/2024 2:32 AM, Bjorn Helgaas wrote:
> On Wed, Nov 06, 2024 at 01:16:36PM +0530, Dheeraj Kumar Srivastava wrote:
>> Device id user input is needed for dumping IOMMU data structures like
>> device table, IRT etc in AMD IOMMU debugfs.
>>
>> eg.
>> 1. # echo 0000:01:00.0 > /sys/kernel/debug/iommu/amd/devid
>>     # cat /sys/kernel/debug/iommu/amd/devid
>>     Output : 0000:01:00.0
>>
>> 2. # echo 01:00.0 > /sys/kernel/debug/iommu/amd/devid
>>     # cat /sys/kernel/debug/iommu/amd/devid
>>     Output : 0000:01:00.0
> 
> The corresponding Intel IOMMU debugfs support encodes the BDF in the
> pathname, e.g.,
> 
>    /sys/kernel/debug/iommu/intel/<bdf>/domain_translation_struct
> 
> Can you do the same?  I think it would be nicer to use a similar
> style, and it would also make the code simpler.
> 

Hi, Yeah i do agree with your suggestion. But lets keep this as open 
question about how we want the interface to be and get more suggestions 
on this one. Will reiterate with all other changes suggested.


Regards
Dheeraj

> Bjorn