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