mirror of
https://mirrors.bfsu.edu.cn/git/linux.git
synced 2024-12-05 10:04:12 +08:00
46284c6ceb
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>
38 lines
1.6 KiB
Plaintext
38 lines
1.6 KiB
Plaintext
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
|
|
|
|
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.
|