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| 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 /include/linux/dmar.h | |
| parent | iommu/vt-d: Do not falsely log intel_iommu is unsupported kernel option (diff) | |
| download | linux-dev-914ff7719e8adaf87131dd7cd0a3520afcf89516.tar.xz linux-dev-914ff7719e8adaf87131dd7cd0a3520afcf89516.zip | |
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 'include/linux/dmar.h')
| -rw-r--r-- | include/linux/dmar.h | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/include/linux/dmar.h b/include/linux/dmar.h index e04436a7ff27..45e903d84733 100644 --- a/include/linux/dmar.h +++ b/include/linux/dmar.h @@ -131,6 +131,14 @@ static inline int dmar_res_noop(struct acpi_dmar_header *hdr, void *arg) return 0; } +#ifdef CONFIG_DMAR_DEBUG +void dmar_fault_dump_ptes(struct intel_iommu *iommu, u16 source_id, + unsigned long long addr, u32 pasid); +#else +static inline void dmar_fault_dump_ptes(struct intel_iommu *iommu, u16 source_id, + unsigned long long addr, u32 pasid) {} +#endif + #ifdef CONFIG_INTEL_IOMMU extern int iommu_detected, no_iommu; extern int intel_iommu_init(void); |