iommu: Add event tracing feature to iommu

This patch set adds tracing feature to iommu driver to report various iommu events. Classes iommu_group, iommu_device, and iommu_map_unmap are defined.

iommu_group class events can be enabled to trigger when devices get added to and removed from an iommu group. Trace information includes iommu group id and device name.

iommu:add_device_to_group
iommu:remove_device_from_group

iommu_device class events can be enabled to trigger when devices are attached to and detached from a domain. Trace information includes device name.

iommu:attach_device_to_domain
iommu:detach_device_from_domain

iommu_map_unmap class events can be enabled to trigger when iommu map and unmap iommu ops complete. Trace information includes iova, physical address (map event only), and size.

iommu:map
iommu:unmap

In addition to defining the new traces, iommu driver is changed to call trace events.

Changes since the last patch set:
- Addressed feedback: removed iommu_amd_event class.
- Generated patch with the new trace event defines.
- Generated individual patches for each trace event call in iommu driver

Shuah Khan (7):
iommu: Add event tracing feature to iommu
iommu: Change iommu driver to call add_device_to_group trace event
iommu: Change iommu driver to call remove_device_to_group trace event
iommu: Change iommu driver to call attach_device_to_domain trace
event
iommu: Change iommu driver to call detach_device_to_domain trace
event
iommu: Change iommu driver to call map trace event
iommu: Change iommu driver to call unmap trace event

 drivers/iommu/Makefile       |    1 +
 drivers/iommu/iommu-traces.c |   24 ++++++++
 drivers/iommu/iommu.c        |   15 ++++-
 include/trace/events/iommu.h |  129 ++++++++++++++++++++++++++++++++++++++++++
 4 files changed, 168 insertions(+), 1 deletion(-)
 create mode 100644 drivers/iommu/iommu-traces.c
 create mode 100644 include/trace/events/iommu.h

1.7.10.4