For health monitoring, it can be useful to know if iommu is behaving as expected. DMAR faults can be an indicator that a device: - has been misconfigured, or - has experienced a hardware hiccup and replacement should be considered, or - has been issuing faults due to malicious activity Currently the only way to check if there were any DMAR faults on the host is to scan the dmesg output. However this approach is not very elegant. The information we are looking for can be wrapped out of the buffer, or masked (since it is a rate-limited print) by another device. The series adds counters for DMAR faults and exposes them via sysfs. Yuri Volchkov (2): iommu/dmar: collect fault statistics iommu/dmar: catch early fault occurrences drivers/iommu/dmar.c | 182 ++++++++++++++++++++++++++++++++---- drivers/iommu/intel-iommu.c | 1 + drivers/pci/pci-sysfs.c | 20 ++++ include/linux/intel-iommu.h | 4 + include/linux/pci.h | 11 +++ 5 files changed, 201 insertions(+), 17 deletions(-) -- 2.23.0 Amazon Development Center Germany GmbH Krausenstr. 38 10117 Berlin Geschaeftsfuehrung: Christian Schlaeger, Ralf Herbrich Eingetragen am Amtsgericht Charlottenburg unter HRB 149173 B Sitz: Berlin Ust-ID: DE 289 237 879
