linux-kernel - Re: [PATCH v3 0/8] Introduce debugfs support in IOMMU

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Message-ID: <49dd39ba-fda0-4ea2-830a-82b591b48332@amd.com>
Date: Thu, 6 Feb 2025 15:56:19 +0700
From: "Suthikulpanit, Suravee" <suravee.suthikulpanit@....com>
To: Dheeraj Kumar Srivastava <dheerajkumar.srivastava@....com>,
 joro@...tes.org, will@...nel.org, robin.murphy@....com,
 linux-kernel@...r.kernel.org, iommu@...ts.linux.dev
Cc: vasant.hegde@....com
Subject: Re: [PATCH v3 0/8] Introduce debugfs support in IOMMU


On 2/6/2025 12:59 PM, Dheeraj Kumar Srivastava wrote:
> From: root <root@...DHSRIVAS.amd.com>
> 
> Introducing debugfs support in AMD/IOMMU driver that will allow
> userspace to dump below IOMMU information
> 1) MMIO and Capability register per IOMMU
> 2) Command buffer
> 3) Device table entry
> 4) Interrupt remapping table entry
> 
> Analyzing contents of IOMMU data structures helps in understanding IOMMU
> capabilities and behavior and debug issues faster.
> 
> 1. MMIO and Capability registers - Add support to dump MMIO and Capability
>     registers per IOMMU.
> 
>     Example:
>     a. Write MMIO register offset to dump it
>        $ echo 0x18 > /sys/kernel/debug/iommu/amd/iommu00/mmio
>        $ cat /sys/kernel/debug/iommu/amd/iommu00/mmio
> 
>        Output:
>        $ 0x0003f48d

Correction: Based on the documentation in patch 8/8, the output would be

	Offset:0x18 Value:0x0003f48d

>      b. Write capability register offset to dump it
>         $ echo 0x10 > /sys/kernel/debug/iommu/amd/iommu00/capability
>         $ cat /sys/kernel/debug/iommu/amd/iommu00/capability
> 
>         Output:
>         $ 0x00203040

Correction: Based on the documentation in patch 8/8, the output would be

	Offset:0x10 Value:0x00203040

Suravee