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Message-ID: <5baa8c11-806c-4937-819d-a3b99a07c690@linux.intel.com>
Date: Fri, 13 Oct 2023 12:23:00 +0800
From: Baolu Lu <baolu.lu@...ux.intel.com>
To: Jingqi Liu <Jingqi.liu@...el.com>, iommu@...ts.linux.dev,
Tian Kevin <kevin.tian@...el.com>,
David Woodhouse <dwmw2@...radead.org>,
Joerg Roedel <joro@...tes.org>, Will Deacon <will@...nel.org>,
Robin Murphy <robin.murphy@....com>
Cc: baolu.lu@...ux.intel.com, linux-kernel@...r.kernel.org
Subject: Re: [PATH v4 0/3] iommu/vt-d: debugfs: Enhancements to IOMMU debugfs
On 10/11/23 4:39 PM, Jingqi Liu wrote:
> The original debugfs only dumps all IOMMU page tables without pasid
> supported. It traverses all devices on the pci bus, then dumps all page
> tables based on device domains. This traversal is from software
> perspective. This series dumps page tables whose mappings are created
> and destroyed by the iommu_map/unmap() interfaces, by traversing root
> tables, context tables, pasid directories and pasid tables from hardware
> perspective. It supports dumping a specified page table in legacy mode
> or scalable mode with or without a specified pasid. It adds a debugfs
> directory per pair of {device, pasid} when attaching device with pasid,
> i.e. /sys/kernel/debug/iommu/intel/<device source id>/<pasid>. And
> create a debugfs file in the directory for users to dump the page table
> corresponding to {device, pasid}. e.g.
> /sys/kernel/debug/iommu/intel/0000:00:02.0/1/domain_translation_struct.
> For the default domain without pasid, it creates a debugfs file in the
> debugfs device directory for users to dump its page table. e.g.
> /sys/kernel/debug/iommu/intel/0000:00:02.0/domain_translation_struct.
> Remove the corresponding debugfs directory and file when detaching or
> releasing a device. For legacy mode, according to bus number and DEVFN,
> traverse the root table and context table to get the pointer of page
> table in the context table entry, then dump the specified page table.
> For scalable mode, according to bus number, DEVFN and pasid, traverse
> the root table, context table, pasid directory and pasid table to get
> the pointer of page table in the pasid table entry, then dump the
> specified page table. Examples are as follows: 1) Dump the page table of
> device "0000:00:01.0" that only supports legacy mode. $ sudo cat
> /sys/kernel/debug/iommu/intel/0000:00:01.0/domain_translation_struct 2)
> Dump the page table of device "0000:00:02.0" with PASID "1" that
> supports scalable mode. $ sudo cat
> /sys/kernel/debug/iommu/intel/0000:00:0a.0/1/domain_translation_struct
This series doesn't apply to v6.6-rc5. Can you please rebase and send a
new version?
Best regards,
baolu
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