| .. 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 |
