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.. SPDX-License-Identifier: GPL-2.0
============================================
Ampere SoC Performance Monitoring Unit (PMU)
============================================
Ampere SoC PMU is a generic PMU IP that follows Arm CoreSight PMU architecture.
Therefore, the driver is implemented as a submodule of arm_cspmu driver. At the
first phase it's used for counting MCU events on AmpereOne.
MCU PMU events
--------------
The PMU driver supports setting filters for "rank", "bank", and "threshold".
Note, that the filters are per PMU instance rather than per event.
Example for perf tool use::
/ # perf list ampere
ampere_mcu_pmu_0/act_sent/ [Kernel PMU event]
<...>
ampere_mcu_pmu_1/rd_sent/ [Kernel PMU event]
<...>
/ # perf stat -a -e ampere_mcu_pmu_0/act_sent,bank=5,rank=3,threshold=2/,ampere_mcu_pmu_1/rd_sent/ \
sleep 1
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