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| author | Kyung Min Park <kyung.min.park@intel.com> | 2021-10-14 08:38:32 +0300 |
|---|---|---|
| committer | Joerg Roedel <jroedel@suse.de> | 2021-10-18 13:31:48 +0300 |
| commit | 914ff7719e8adaf87131dd7cd0a3520afcf89516 (patch) | |
| tree | 767f43e8b3d8527cbbf2d8ac3d8d44ac311c184a /drivers/iommu/intel/dmar.c | |
| parent | 5240aed2cd2594fb392239f11b9681e5e1591619 (diff) | |
| download | linux-914ff7719e8adaf87131dd7cd0a3520afcf89516.tar.xz | |
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/dmar.c')
| -rw-r--r-- | drivers/iommu/intel/dmar.c | 10 |
1 files changed, 8 insertions, 2 deletions
diff --git a/drivers/iommu/intel/dmar.c b/drivers/iommu/intel/dmar.c index b7708b93f3fa..915bff76fe96 100644 --- a/drivers/iommu/intel/dmar.c +++ b/drivers/iommu/intel/dmar.c @@ -1941,12 +1941,16 @@ static int dmar_fault_do_one(struct intel_iommu *iommu, int type, reason = dmar_get_fault_reason(fault_reason, &fault_type); - if (fault_type == INTR_REMAP) + if (fault_type == INTR_REMAP) { pr_err("[INTR-REMAP] Request device [%02x:%02x.%d] fault index 0x%llx [fault reason 0x%02x] %s\n", source_id >> 8, PCI_SLOT(source_id & 0xFF), PCI_FUNC(source_id & 0xFF), addr >> 48, fault_reason, reason); - else if (pasid == INVALID_IOASID) + + return 0; + } + + if (pasid == INVALID_IOASID) pr_err("[%s NO_PASID] Request device [%02x:%02x.%d] fault addr 0x%llx [fault reason 0x%02x] %s\n", type ? "DMA Read" : "DMA Write", source_id >> 8, PCI_SLOT(source_id & 0xFF), @@ -1959,6 +1963,8 @@ static int dmar_fault_do_one(struct intel_iommu *iommu, int type, PCI_FUNC(source_id & 0xFF), addr, fault_reason, reason); + dmar_fault_dump_ptes(iommu, source_id, addr, pasid); + return 0; } |