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

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Message-ID: <20250902161028.GC184112@ziepe.ca>
Date: Tue, 2 Sep 2025 13:10:28 -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 Thu, Aug 14, 2025 at 05:30:03PM +0800, Qinxin Xia wrote:
> This patch supports the iopgtable_dump function (similar to kernel_page_dump).
> The IOMMU page table dump debugging function is added to the framework layer.
> Different architectures only need to provide the implemented dump ops.
> It also provides the implementation of ARM SMMUv3 and io-pgtable-arm.
> 
> Qinxin Xia (2):
>   iommu/debug: Add IOMMU page table dump debug facility
>   iommu/io-pgtable: Add ARM SMMUv3 page table dump support

I'd prefer we do this on top of iommu pt please, I don't want to
further deeping the hole of changing all the page table code in all
drivers for debugfs.

Jason