diff options
| author | Kyung Min Park <kyung.min.park@intel.com> | 2021-10-14 13:38:32 +0800 |
|---|---|---|
| committer | Joerg Roedel <jroedel@suse.de> | 2021-10-18 12:31:48 +0200 |
| commit | 914ff7719e8adaf87131dd7cd0a3520afcf89516 (patch) | |
| tree | 767f43e8b3d8527cbbf2d8ac3d8d44ac311c184a /drivers/iommu/intel/Kconfig | |
| parent | 5240aed2cd2594fb392239f11b9681e5e1591619 (diff) | |
iommu/vt-d: Dump DMAR translation structure when DMA fault occurs
When the dmar translation fault happens, the kernel prints a single line
fault reason with corresponding hexadecimal code defined in the Intel VT-d
specification.
Currently, when user wants to debug the translation fault in detail,
debugfs is used for dumping the dmar_translation_struct, which is not
available when the kernel failed to boot.
Dump the DMAR translation structure, pagewalk the IO page table and print
the page table entry when the fault happens.
This takes effect only when CONFIG_DMAR_DEBUG is enabled.
Signed-off-by: Kyung Min Park <kyung.min.park@intel.com>
Link: https://lore.kernel.org/r/20210815203845.31287-1-kyung.min.park@intel.com
Signed-off-by: Lu Baolu <baolu.lu@linux.intel.com>
Link: https://lore.kernel.org/r/20211014053839.727419-3-baolu.lu@linux.intel.com
Signed-off-by: Joerg Roedel <jroedel@suse.de>
Diffstat (limited to 'drivers/iommu/intel/Kconfig')
| -rw-r--r-- | drivers/iommu/intel/Kconfig | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/drivers/iommu/intel/Kconfig b/drivers/iommu/intel/Kconfig index 0ddb77115be7..247d0f2d5fdf 100644 --- a/drivers/iommu/intel/Kconfig +++ b/drivers/iommu/intel/Kconfig @@ -6,6 +6,9 @@ config DMAR_TABLE config DMAR_PERF bool +config DMAR_DEBUG + bool + config INTEL_IOMMU bool "Support for Intel IOMMU using DMA Remapping Devices" depends on PCI_MSI && ACPI && (X86 || IA64) @@ -31,6 +34,7 @@ config INTEL_IOMMU_DEBUGFS bool "Export Intel IOMMU internals in Debugfs" depends on IOMMU_DEBUGFS select DMAR_PERF + select DMAR_DEBUG help !!!WARNING!!! |