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Diffstat (limited to 'Documentation/ABI/testing/sysfs-kernel-iommu_groups')
| -rw-r--r-- | Documentation/ABI/testing/sysfs-kernel-iommu_groups | 35 |
1 files changed, 35 insertions, 0 deletions
diff --git a/Documentation/ABI/testing/sysfs-kernel-iommu_groups b/Documentation/ABI/testing/sysfs-kernel-iommu_groups new file mode 100644 index 000000000..017f5bc39 --- /dev/null +++ b/Documentation/ABI/testing/sysfs-kernel-iommu_groups @@ -0,0 +1,35 @@ +What: /sys/kernel/iommu_groups/ +Date: May 2012 +KernelVersion: v3.5 +Contact: Alex Williamson <alex.williamson@redhat.com> +Description: /sys/kernel/iommu_groups/ contains a number of sub- + directories, each representing an IOMMU group. The + name of the sub-directory matches the iommu_group_id() + for the group, which is an integer value. Within each + subdirectory is another directory named "devices" with + links to the sysfs devices contained in this group. + The group directory also optionally contains a "name" + file if the IOMMU driver has chosen to register a more + common name for the group. +Users: + +What: /sys/kernel/iommu_groups/reserved_regions +Date: January 2017 +KernelVersion: v4.11 +Contact: Eric Auger <eric.auger@redhat.com> +Description: /sys/kernel/iommu_groups/reserved_regions list IOVA + regions that are reserved. Not necessarily all + reserved regions are listed. This is typically used to + output direct-mapped, MSI, non mappable regions. Each + region is described on a single line: the 1st field is + the base IOVA, the second is the end IOVA and the third + field describes the type of the region. + +What: /sys/kernel/iommu_groups/reserved_regions +Date: June 2019 +KernelVersion: v5.3 +Contact: Eric Auger <eric.auger@redhat.com> +Description: In case an RMRR is used only by graphics or USB devices + it is now exposed as "direct-relaxable" instead of "direct". + In device assignment use case, for instance, those RMRR + are considered to be relaxable and safe. |