iommu/vt-d: Add debugfs support to show context internals
Export Intel IOMMU DMA remapping internal states, such as root and
context table entries in debugfs.
Example of such dump in Kabylake:
/sys/kernel/debug/iommu/intel/dmar_translation_struct
IOMMU dmar0: Root Table Address:
45699c000
Root Table Entries:
Bus: 0 H: 0 L:
45699f001
Context Table Entries for Bus: 0
Entry B:D.F High Low
16 00:02.0 102
45699e005
IOMMU dmar1: Root Table Address:
45699d000
Root Table Entries:
Bus: 0 H: 0 L:
45644f001
Context Table Entries for Bus: 0
Entry B:D.F High Low
160 00:14.0 102
45644e001
184 00:17.0 302
456310001
248 00:1f.0 202
4564bf001
Cc: Lu Baolu <baolu.lu@linux.intel.com>
Cc: Fenghua Yu <fenghua.yu@intel.com>
Cc: Ashok Raj <ashok.raj@intel.com>
Cc: Jacob Pan <jacob.jun.pan@linux.intel.com>
Co-Developed-by: Gayatri Kammela <gayatri.kammela@intel.com>
Signed-off-by: Gayatri Kammela <gayatri.kammela@intel.com>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Reviewed-by: Lu Baolu <baolu.lu@linux.intel.com>
Signed-off-by: Sohil Mehta <sohil.mehta@intel.com>
Signed-off-by: Joerg Roedel <jroedel@suse.de>