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

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Message-ID: <f2720f17-5e81-4f69-aaf5-791b47973178@huawei.com>
Date: Wed, 10 Sep 2025 11:20:08 +0800
From: Qinxin Xia <xiaqinxin@...wei.com>
To: Jason Gunthorpe <jgg@...pe.ca>
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 2025/9/3 00:10:28, Jason Gunthorpe <jgg@...pe.ca> wrote:
> 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
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.