ampere_cspmu.rst

 1.. SPDX-License-Identifier: GPL-2.0
 2
 3============================================
 4Ampere SoC Performance Monitoring Unit (PMU)
 5============================================
 6
 7Ampere SoC PMU is a generic PMU IP that follows Arm CoreSight PMU architecture.
 8Therefore, the driver is implemented as a submodule of arm_cspmu driver. At the
 9first phase it's used for counting MCU events on AmpereOne.
10
11
12MCU PMU events
13--------------
14
15The PMU driver supports setting filters for "rank", "bank", and "threshold".
16Note, that the filters are per PMU instance rather than per event.
17
18
19Example for perf tool use::
20
21  / # perf list ampere
22
23    ampere_mcu_pmu_0/act_sent/                         [Kernel PMU event]
24    <...>
25    ampere_mcu_pmu_1/rd_sent/                          [Kernel PMU event]
26    <...>
27
28  / # perf stat -a -e ampere_mcu_pmu_0/act_sent,bank=5,rank=3,threshold=2/,ampere_mcu_pmu_1/rd_sent/ \
29        sleep 1