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linux/Documentation/ABI/testing/sysfs-bus-event_source-devices-iommu

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iommu/vt-d: Add IOMMU perfmon support Implement the IOMMU performance monitor capability, which supports the collection of information about key events occurring during operation of the remapping hardware, to aid performance tuning and debug. The IOMMU perfmon support is implemented as part of the IOMMU driver and interfaces with the Linux perf subsystem. The IOMMU PMU has the following unique features compared with the other PMUs. - Support counting. Not support sampling. - Does not support per-thread counting. The scope is system-wide. - Support per-counter capability register. The event constraints can be enumerated. - The available event and event group can also be enumerated. - Extra Enhanced Commands are introduced to control the counters. Add a new variable, struct iommu_pmu *pmu, to in the struct intel_iommu to track the PMU related information. Add iommu_pmu_register() and iommu_pmu_unregister() to register and unregister a IOMMU PMU. The register function setup the IOMMU PMU ops and invoke the standard perf_pmu_register() interface to register a PMU in the perf subsystem. This patch only exposes the functions. The following patch will enable them in the IOMMU driver. The IOMMU PMUs can be found under /sys/bus/event_source/devices/dmar* The available filters and event format can be found at the format folder $ ls /sys/bus/event_source/devices/dmar1/format/ event event_group filter_ats filter_ats_en filter_page_table filter_page_table_en The supported events can be found at the events folder $ ls /sys/bus/event_source/devices/dmar1/events/ ats_blocked fs_nonleaf_hit int_cache_hit_posted iommu_mem_blocked iotlb_hit pasid_cache_lookup ss_nonleaf_hit ctxt_cache_hit fs_nonleaf_lookup int_cache_lookup iommu_mrds iotlb_lookup pg_req_posted ss_nonleaf_lookup ctxt_cache_lookup int_cache_hit_nonposted iommu_clocks iommu_requests pasid_cache_hit pw_occupancy The command below illustrates filter usage with a simple example. $ perf stat -e dmar1/iommu_requests,filter_ats_en=0x1,filter_ats=0x1/ -a sleep 1 Performance counter stats for 'system wide': 368,947 dmar1/iommu_requests,filter_ats_en=0x1,filter_ats=0x1/ 1.002592074 seconds time elapsed Signed-off-by: Kan Liang <kan.liang@linux.intel.com> Link: https://lore.kernel.org/r/20230128200428.1459118-5-kan.liang@linux.intel.com Signed-off-by: Lu Baolu <baolu.lu@linux.intel.com> Signed-off-by: Joerg Roedel <jroedel@suse.de>
2023-01-31 00:37:37 -07:00
What: /sys/bus/event_source/devices/dmar*/format
Date: Jan 2023
KernelVersion: 6.3
Contact: Kan Liang <kan.liang@linux.intel.com>
Description: Read-only. Attribute group to describe the magic bits
that go into perf_event_attr.config,
perf_event_attr.config1 or perf_event_attr.config2 for
the IOMMU pmu. (See also
ABI/testing/sysfs-bus-event_source-devices-format).
Each attribute in this group defines a bit range in
perf_event_attr.config, perf_event_attr.config1,
or perf_event_attr.config2. All supported attributes
are listed below (See the VT-d Spec 4.0 for possible
attribute values)::
event = "config:0-27" - event ID
event_group = "config:28-31" - event group ID
filter_requester_en = "config1:0" - Enable Requester ID filter
filter_domain_en = "config1:1" - Enable Domain ID filter
filter_pasid_en = "config1:2" - Enable PASID filter
filter_ats_en = "config1:3" - Enable Address Type filter
filter_page_table_en= "config1:4" - Enable Page Table Level filter
filter_requester_id = "config1:16-31" - Requester ID filter
filter_domain = "config1:32-47" - Domain ID filter
filter_pasid = "config2:0-21" - PASID filter
filter_ats = "config2:24-28" - Address Type filter
filter_page_table = "config2:32-36" - Page Table Level filter
iommu/vt-d: Support cpumask for IOMMU perfmon The perf subsystem assumes that all counters are by default per-CPU. So the user space tool reads a counter from each CPU. However, the IOMMU counters are system-wide and can be read from any CPU. Here we use a CPU mask to restrict counting to one CPU to handle the issue. (with CPU hotplug notifier to choose a different CPU if the chosen one is taken off-line). The CPU is exposed to /sys/bus/event_source/devices/dmar*/cpumask for the user space perf tool. Signed-off-by: Kan Liang <kan.liang@linux.intel.com> Link: https://lore.kernel.org/r/20230128200428.1459118-6-kan.liang@linux.intel.com Signed-off-by: Lu Baolu <baolu.lu@linux.intel.com> Signed-off-by: Joerg Roedel <jroedel@suse.de>
2023-01-31 00:37:38 -07:00
What: /sys/bus/event_source/devices/dmar*/cpumask
Date: Jan 2023
KernelVersion: 6.3
Contact: Kan Liang <kan.liang@linux.intel.com>
Description: Read-only. This file always returns the CPU to which the
IOMMU pmu is bound for access to all IOMMU pmu performance
monitoring events.
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