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iommu/vt-d: Improve IOMMU fault information

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In some environments, multiple PCIe segments exist, and PCIe device
information needs to be differentiated and identified based on the
segment. When an IOMMU fault event occurs, the IOMMU and device segment
information should be output in detail in dmar_fault_do_one.

Signed-off-by: Guanghui Feng <guanghuifeng@linux.alibaba.com>
Link: https://lore.kernel.org/r/20260528022943.1697564-1-guanghuifeng@linux.alibaba.com
Signed-off-by: Lu Baolu <baolu.lu@linux.intel.com>
Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
This commit is contained in:
Guanghui Feng 2026-06-04 14:03:09 +08:00 committed by Joerg Roedel
parent 214ffed161
commit c468814b3f
1 changed files with 6 additions and 3 deletions
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9
drivers/iommu/intel/dmar.c
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@ -1894,7 +1894,8 @@ 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) {
pr_err("[INTR-REMAP] Request device [%02x:%02x.%d] fault index 0x%llx [fault reason 0x%02x] %s\n",
pr_err("[INTR-REMAP] Request device [%04x:%02x:%02x.%d] fault index 0x%llx [fault reason 0x%02x] %s\n",
iommu->segment,
source_id >> 8, PCI_SLOT(source_id & 0xFF),
PCI_FUNC(source_id & 0xFF), addr >> 48,
fault_reason, reason);
@ -1903,14 +1904,16 @@ static int dmar_fault_do_one(struct intel_iommu *iommu, int type,
}
if (pasid == IOMMU_PASID_INVALID)
pr_err("[%s NO_PASID] Request device [%02x:%02x.%d] fault addr 0x%llx [fault reason 0x%02x] %s\n",
pr_err("[%s NO_PASID] Request device [%04x:%02x:%02x.%d] fault addr 0x%llx [fault reason 0x%02x] %s\n",
type ? "DMA Read" : "DMA Write",
iommu->segment,
source_id >> 8, PCI_SLOT(source_id & 0xFF),
PCI_FUNC(source_id & 0xFF), addr,
fault_reason, reason);
else
pr_err("[%s PASID 0x%x] Request device [%02x:%02x.%d] fault addr 0x%llx [fault reason 0x%02x] %s\n",
pr_err("[%s PASID 0x%x] Request device [%04x:%02x:%02x.%d] fault addr 0x%llx [fault reason 0x%02x] %s\n",
type ? "DMA Read" : "DMA Write", pasid,
iommu->segment,
source_id >> 8, PCI_SLOT(source_id & 0xFF),
PCI_FUNC(source_id & 0xFF), addr,
fault_reason, reason);