Subject: [PATCH 0/3] iommu: Add PCI vendor:device ID to IOMMU fault logs

From: Yigit Oguz <[email-masked]>
Date: Wed, 6 May 2026 15:05:36 +0000

IOMMU fault and event logs currently identify devices using only their
PCI segment/bus/device/function (SSSS:BB:DD.F). While mapping a single
BDF to a device type is straightforward, doing so at scale across many
hosts and thousands of fault events requires additional tooling and
manual cross-referencing. Including the vendor:device ID directly in
the log line makes each event self-contained and immediately actionable
without any post-processing.

This series adds vendor:device ID (VVVV:DDDD) to IOMMU event logs for
ARM SMMUv3, Intel VT-d and AMD IOMMU.

Before:
  arm-smmu-v3 arm-smmu-v3.0.auto: event: F_TRANSLATION client: 0000:2b:11.6
    sid: 0x158e ssid: 0x0 iova: 0x280000000000 ipa: 0x0
  DMAR: [DMA Write NO_PASID] Request device [86:00.0] fault addr 0xe0000000
    [fault reason 0x05] PTE Write access is not set
  AMD-Vi: Event logged [IO_PAGE_FAULT device=0000:41:00.0 domain=0x000a
    address=0xe0000000 flags=0x0020]

After:
  arm-smmu-v3 arm-smmu-v3.0.auto: event: F_TRANSLATION client: 0000:2b:11.6 [8086:1533]
    sid: 0x158e ssid: 0x0 iova: 0x280000000000 ipa: 0x0
  DMAR: [DMA Write NO_PASID] Request device [0000:86:00.0 8086:1533] fault addr 0xe0000000
    [fault reason 0x05] PTE Write access is not set
  AMD-Vi: Event logged [IO_PAGE_FAULT device=0000:41:00.0 8086:1533 domain=0x000a
    address=0xe0000000 flags=0x0020]

Patch 1 adds vendor:device ID to ARM SMMUv3 translation fault logs.
Patch 2 adds PCI segment and vendor:device ID to Intel VT-d DMAR
        fault logs.
Patch 3 adds a devid_str helper and vendor:device ID to all AMD IOMMU
        event log paths.

Testing:
Build-tested against mainline Linux (torvalds/master).

Runtime-tested on a custom downstream branch on ARM SMMUv3, Intel VT-d and
AMD IOMMU hosts. Translation faults were induced in a virtualized setup
by removing DMA mappings for an in-use region, causing the assigned device's
subsequent DMA transactions to hit unmapped IOVAs and produce
translation fault events. The resulting log lines were verified to
contain the PCI vendor:device ID on all three platforms.

Lilit Janpoladyan (1):
  iommu/arm-smmu-v3: Print PCI vendor:device ID in SMMU translation
    fault logs

Yigit Oguz (2):
  iommu/vt-d: Add PCI segment and vendor:device ID to DMAR fault logs
  iommu/amd: Add vendor:device ID to AMD IOMMU event logs

 drivers/iommu/amd/iommu.c                   | 94 +++++++++++++--------
 drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c | 29 ++++++-
 drivers/iommu/intel/dmar.c                  | 33 +++++---
 3 files changed, 104 insertions(+), 52 deletions(-)

-- 
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