From 9f0fc191371843c4fc000a226b0a26b6c059aacd Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Sat, 18 May 2024 19:40:19 +0200 Subject: Merging upstream version 6.7.7. Signed-off-by: Daniel Baumann --- Documentation/admin-guide/perf/ampere_cspmu.rst | 29 +++++++++++++++++++++++++ 1 file changed, 29 insertions(+) create mode 100644 Documentation/admin-guide/perf/ampere_cspmu.rst (limited to 'Documentation/admin-guide/perf/ampere_cspmu.rst') diff --git a/Documentation/admin-guide/perf/ampere_cspmu.rst b/Documentation/admin-guide/perf/ampere_cspmu.rst new file mode 100644 index 0000000000..94f93f5aee --- /dev/null +++ b/Documentation/admin-guide/perf/ampere_cspmu.rst @@ -0,0 +1,29 @@ +.. 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 -- cgit v1.2.3