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Details is added about "caps" attribute group in the ABI documentation. This is used to expose some of the PMU attributes in "caps" directory under : /sys/bus/event_source/devices/<dev>/. The dev/caps will contain information about features that platform specific PMU supports. Signed-off-by: Athira Rajeev <atrajeev@linux.vnet.ibm.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/20220520084630.15181-2-atrajeev@linux.vnet.ibm.com
18 lines
717 B
Text
18 lines
717 B
Text
What: /sys/bus/event_source/devices/<dev>/caps
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Date: May 2022
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KernelVersion: 5.19
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Contact: Linux kernel mailing list <linux-kernel@vger.kernel.org>
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Description:
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Attribute group to describe the capabilities exposed
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for a particular pmu. Each attribute of this group can
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expose information specific to a PMU, say pmu_name, so that
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userspace can understand some of the feature which the
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platform specific PMU supports.
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One of the example available capability in supported platform
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like Intel is pmu_name, which exposes underlying CPU name known
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to the PMU driver.
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Example output in powerpc:
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grep . /sys/bus/event_source/devices/cpu/caps/*
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/sys/bus/event_source/devices/cpu/caps/pmu_name:POWER9
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