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

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Message-ID: <oj2duepunogk6zr3aicvh4dlwt2tltdq3kh4ke5nwuae2k7v7g@4jo2qsfiobhs>
Date: Thu, 13 Nov 2025 16:13:57 +0100
From: Jörg Rödel <joro@...tes.org>
To: Dheeraj Kumar Srivastava <dheerajkumar.srivastava@....com>
Cc: will@...nel.org, robin.murphy@....com, iommu@...ts.linux.dev, 
	linux-kernel@...r.kernel.org, suravee.suthikulpanit@....com, Vasant.Hegde@....com, 
	Santosh.Shukla@....com, Ankit Soni <Ankit.Soni@....com>
Subject: Re: [PATCH v5] iommu/amd: Enhance "Completion-wait Time-out" error
 message

On Thu, Nov 13, 2025 at 02:43:50AM +0530, 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>

Applied, thanks.