Messages in this thread | | | From | "Tian, Kevin" <> | Subject | RE: [PATCH 0/5] iommu/vt-d: debugfs: Enhancements to IOMMU debugfs | Date | Mon, 3 Jul 2023 07:15:04 +0000 |
| |
> From: Liu, Jingqi <jingqi.liu@intel.com> > Sent: Sunday, June 25, 2023 11:05 PM > > 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 by traversing root tables, context tables, > pasid directories and pasid tables from hardware perspective. By > specifying source identifier and PASID, it supports dumping specified > page table or all page tables in legacy mode or scalable mode. > > For a device that only supports legacy mode, specify the source > identifier, and search the root table and context table to dump its > page table. It does not support to specify PASID. > > For a device that supports scalable mode, specify a > {source identifier, PASID} pair and search the root table, context table > and pasid table to dump its page table. If the pasid is not specified, > it is set to RID_PASID. > > Switch to dump all page tables by specifying "auto". > > Examples are as follows: > 1) Dump the page table of device "00:1f.0" that only supports legacy > mode. > > $ sudo echo 00:1f.0 > > /sys/kernel/debug/iommu/intel/domain_translation_struct > $ sudo cat /sys/kernel/debug/iommu/intel/domain_translation_struct > Device 0000:00:1f.0 @0x105407000 > IOVA_PFN PML5E PML4E > 0x0000000000000 | 0x0000000000000000 0x0000000105408003 > 0x0000000000001 | 0x0000000000000000 0x0000000105408003 > 0x0000000000002 | 0x0000000000000000 0x0000000105408003 > 0x0000000000003 | 0x0000000000000000 0x0000000105408003 > > PDPE PDE PTE > 0x0000000105409003 0x000000010540a003 0x0000000000000003 > 0x0000000105409003 0x000000010540a003 0x0000000000001003 > 0x0000000105409003 0x000000010540a003 0x0000000000002003 > 0x0000000105409003 0x000000010540a003 0x0000000000003003 > > [...] > > 2) Dump the page table of device "00:0a.0" with pasid "2". > > $ sudo echo 00:0a.0,2 > > /sys/kernel/debug/iommu/intel/domain_translation_struct > $ sudo cat /sys/kernel/debug/iommu/intel/domain_translation_struct
What about creating a directory layout per {dev, pasid} so the user can easily figure out and dump?
e.g.
/sys/kernel/debug/iommu/intel/00:0a.0/0/domain_translation_struct /sys/kernel/debug/iommu/intel/00:0a.0/2/domain_translation_struct
> Device 0000:00:0a.0 with pasid 2 @0x1083d7000 > IOVA_PFN PML5E PML4E > 0x0000000000000 | 0x0000000000000000 0x0000000106aaa003 > 0x0000000000001 | 0x0000000000000000 0x0000000106aaa003 > 0x0000000000002 | 0x0000000000000000 0x0000000106aaa003 > 0x0000000000003 | 0x0000000000000000 0x0000000106aaa003 > > PDPE PDE PTE > 0x000000010a819003 0x000000010a7aa003 0x0000000129800003 > 0x000000010a819003 0x000000010a7aa003 0x0000000129801003 > 0x000000010a819003 0x000000010a7aa003 0x0000000129802003 > 0x000000010a819003 0x000000010a7aa003 0x0000000129803003 > > [...] > > 3) Dump all page tables: > $ sudo echo "auto" > > /sys/kernel/debug/iommu/intel/domain_translation_struct > $ sudo cat /sys/kernel/debug/iommu/intel/domain_translation_struct > [...] > > Device 0000:00:02.0 @0x103072000 > IOVA_PFN PML5E PML4E > 0x000000008d800 | 0x0000000000000000 0x0000000103073003 > 0x000000008d801 | 0x0000000000000000 0x0000000103073003 > > PDPE PDE PTE > 0x0000000103074003 0x0000000103075003 0x000000008d800003 > 0x0000000103074003 0x0000000103075003 0x000000008d801003 > > [...] > > Device 0000:00:0a.0 with pasid 2 @0x10a0b6000 > IOVA_PFN PML5E PML4E > 0x0000000000000 | 0x0000000000000000 0x00000001072d2003 > 0x0000000000001 | 0x0000000000000000 0x00000001072d2003 > > PDPE PDE PTE > 0x0000000107d6e003 0x00000001161d4003 0x00000001bdc00003 > 0x0000000107d6e003 0x00000001161d4003 0x00000001bdc01003 > > [...] > > Thanks, > Jingqi > > Jingqi Liu (5): > iommu/vt-d: debugfs: Define domain_translation_struct file ops > iommu/vt-d: debugfs: Support specifying source identifier and PASID > iommu/vt-d: debugfs: Dump the corresponding page table of a pasid > iommu/vt-d: debugfs: Support dumping a specified page table > iommu/vt-d: debugfs: Dump entry pointing to huge page > > drivers/iommu/intel/debugfs.c | 361 ++++++++++++++++++++++++++++++---- > 1 file changed, 326 insertions(+), 35 deletions(-) > > -- > 2.21.3
| |