linux-kernel - Re: [PATCH 0/2] iommu: Add io_ptdump debug interface for iommu

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Message-ID: <20250910141547.GD882933@ziepe.ca>
Date: Wed, 10 Sep 2025 11:15:47 -0300
From: Jason Gunthorpe <jgg@...pe.ca>
To: Qinxin Xia <xiaqinxin@...wei.com>
Cc: will@...nel.org, robin.murphy@....com, linux-kernel@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org, iommu@...ts.linux.dev,
	yangyicong@...wei.com, wangzhou1@...ilicon.com,
	prime.zeng@...ilicon.com, xuwei5@...wei.com, fanghao11@...wei.com,
	jonathan.cameron@...wei.com, linuxarm@...wei.com
Subject: Re: [PATCH 0/2] iommu: Add io_ptdump debug interface for iommu

On Wed, Sep 10, 2025 at 11:20:08AM +0800, Qinxin Xia wrote:
> Ok, I see, my colleague Wang Zhou also released a version of io_ptdump
> a long time ago, which is implemented in smmu debugfs. Will recommends that
> io_ptdump be implemented in a way similar to CPU page table dump. Using
> debugfs to expose the data and using format-specific callbacks to implement
> specific data dumps, I'll talk to him about this as well.

I feel we should have a iommu subsystem debugfs and per-iommu_domain
directories to dump the page tables.

The smmu debugfs can report what iommu_domains each STE/CD is
referencing.

This also needs RCU freeing of page table levels as a locking
strategy.

Jason