linux-kernel - Re: [PATCH v3 2/8] iommu/amd: Add debugfs support to dump IOMMU MMIO registers

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Message-ID: <aac3de2f-8f76-4df7-8eb2-1f89a86cd91f@amd.com>
Date: Mon, 17 Mar 2025 16:52:47 +0530
From: Dheeraj Kumar Srivastava <dheerajkumar.srivastava@....com>
To: Vasant Hegde <vasant.hegde@....com>, joro@...tes.org,
 suravee.suthikulpanit@....com, will@...nel.org, robin.murphy@....com,
 linux-kernel@...r.kernel.org, iommu@...ts.linux.dev
Subject: Re: [PATCH v3 2/8] iommu/amd: Add debugfs support to dump IOMMU MMIO
 registers

Hi Vasant,

On 3/13/2025 3:58 PM, Vasant Hegde wrote:
> 
> 
> On 2/6/2025 11:29 AM, Dheeraj Kumar Srivastava wrote:
>> Analyzing IOMMU MMIO registers gives a view of what IOMMU is
>> configured with on the system and is helpful to debug issues
>> with IOMMU.
>>
>> eg.
>> 1. To get mmio registers value for iommu<x>
>>     # echo "0x18" > /sys/kernel/debug/iommu/amd/iommu00/mmio
>>     # cat /sys/kernel/debug/iommu/amd/iommu00/mmio
> 
> Many of MMIO registers are 8 bytes. By default can we print 8 bytes instead of 4
> bytes?

Sure will print 64 bits (8 bytes) for MMIO registers dump.

Thanks
Dheeraj

> 
> -Vasant
>