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SubjectRe: [PATH v4 0/3] iommu/vt-d: debugfs: Enhancements to IOMMU debugfs
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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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