linux-kernel - Re: [PATCH v5] iommu/amd: Enhance "Completion-wait Time-out" error message

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Message-ID: <7433bd8e-4e09-420f-8708-3c148aca45e9@amd.com>
Date: Thu, 13 Nov 2025 17:04:31 +0530
From: Vasant Hegde <vasant.hegde@....com>
To: Dheeraj Kumar Srivastava <dheerajkumar.srivastava@....com>,
 joro@...tes.org, will@...nel.org, robin.murphy@....com,
 iommu@...ts.linux.dev, linux-kernel@...r.kernel.org
Cc: suravee.suthikulpanit@....com, Santosh.Shukla@....com,
 Ankit Soni <Ankit.Soni@....com>
Subject: Re: [PATCH v5] iommu/amd: Enhance "Completion-wait Time-out" error
 message



On 11/13/2025 2:43 AM, Dheeraj Kumar Srivastava wrote:
> Current IOMMU driver prints "Completion-wait Time-out" error message with
> insufficient information to further debug the issue.
> 
> Enhancing the error message as following:
> 1. Log IOMMU PCI device ID in the error message.
> 2. With "amd_iommu_dump=1" kernel command line option, dump entire
>    command buffer entries including Head and Tail offset.
> 
> Dump the entire command buffer only on the first 'Completion-wait Time-out'
> to avoid dmesg spam.
> 
> Signed-off-by: Dheeraj Kumar Srivastava <dheerajkumar.srivastava@....com>
> Reviewed-by: Ankit Soni <Ankit.Soni@....com>

Reviewed-by: Vasant Hegde <vasant.hegde@....com>

-Vasant