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

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Message-ID: <08816382-f02c-4f98-a355-a4aa5af16d86@amd.com>
Date: Thu, 13 Mar 2025 15:58:12 +0530
From: Vasant Hegde <vasant.hegde@....com>
To: Dheeraj Kumar Srivastava <dheerajkumar.srivastava@....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



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?

-Vasant