| /* |
| * Copyright (c) 2017-2019 ARM Limited. |
| * |
| * SPDX-License-Identifier: MIT |
| * |
| * Permission is hereby granted, free of charge, to any person obtaining a copy |
| * of this software and associated documentation files (the "Software"), to |
| * deal in the Software without restriction, including without limitation the |
| * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or |
| * sell copies of the Software, and to permit persons to whom the Software is |
| * furnished to do so, subject to the following conditions: |
| * |
| * The above copyright notice and this permission notice shall be included in all |
| * copies or substantial portions of the Software. |
| * |
| * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
| * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
| * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE |
| * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER |
| * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, |
| * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE |
| * SOFTWARE. |
| */ |
| |
| #include "pmu_counter.h" |
| |
| #include <asm/unistd.h> |
| #include <cstring> |
| #include <stdexcept> |
| #include <sys/ioctl.h> |
| |
| PmuCounter::PmuCounter() : |
| _perf_config() |
| { |
| _perf_config.type = PERF_TYPE_HARDWARE; |
| _perf_config.size = sizeof(perf_event_attr); |
| |
| // Start disabled |
| _perf_config.disabled = 1; |
| // The inherit bit specifies that this counter should count events of child |
| // tasks as well as the task specified |
| _perf_config.inherit = 1; |
| // Enables saving of event counts on context switch for inherited tasks |
| _perf_config.inherit_stat = 1; |
| } |
| |
| PmuCounter::PmuCounter(uint64_t config) : |
| PmuCounter() |
| { |
| open(config); |
| } |
| |
| PmuCounter::~PmuCounter() |
| { |
| close(); |
| } |
| |
| void PmuCounter::open(uint64_t config) |
| { |
| _perf_config.config = config; |
| open(_perf_config); |
| } |
| |
| void PmuCounter::open(const perf_event_attr &perf_config) |
| { |
| // Measure this process/thread (+ children) on any CPU |
| _fd = syscall(__NR_perf_event_open, &perf_config, 0, -1, -1, 0); |
| |
| if (_fd < 0) |
| { |
| throw std::runtime_error("perf_event_open failed. Counter ID: " + config_to_str(_perf_config)); |
| } |
| |
| const int result = ioctl(_fd, PERF_EVENT_IOC_ENABLE, 0); |
| if (result == -1) |
| { |
| throw std::runtime_error("Failed to enable PMU counter: " + std::string(strerror(errno))); |
| } |
| } |
| |
| void PmuCounter::close() |
| { |
| if (_fd != -1) |
| { |
| ::close(_fd); |
| _fd = -1; |
| } |
| } |
| |
| bool PmuCounter::reset() |
| { |
| const int result = ioctl(_fd, PERF_EVENT_IOC_RESET, 0); |
| return result != -1; |
| } |
| |
| std::string PmuCounter::config_to_str(const perf_event_attr &perf_config) |
| { |
| switch (perf_config.type) |
| { |
| case PERF_TYPE_HARDWARE: |
| switch (perf_config.config) |
| { |
| case PERF_COUNT_HW_CPU_CYCLES: |
| return "PERF_COUNT_HW_CPU_CYCLES"; |
| case PERF_COUNT_HW_INSTRUCTIONS: |
| return "PERF_COUNT_HW_INSTRUCTIONS"; |
| case PERF_COUNT_HW_CACHE_REFERENCES: |
| return "PERF_COUNT_HW_CACHE_REFERENCES"; |
| case PERF_COUNT_HW_CACHE_MISSES: |
| return "PERF_COUNT_HW_CACHE_MISSES"; |
| case PERF_COUNT_HW_BRANCH_INSTRUCTIONS: |
| return "PERF_COUNT_HW_BRANCH_INSTRUCTIONS"; |
| case PERF_COUNT_HW_BRANCH_MISSES: |
| return "PERF_COUNT_HW_BRANCH_MISSES"; |
| case PERF_COUNT_HW_BUS_CYCLES: |
| return "PERF_COUNT_HW_BUS_CYCLES"; |
| case PERF_COUNT_HW_STALLED_CYCLES_FRONTEND: |
| return "PERF_COUNT_HW_STALLED_CYCLES_FRONTEND"; |
| case PERF_COUNT_HW_STALLED_CYCLES_BACKEND: |
| return "PERF_COUNT_HW_STALLED_CYCLES_BACKEND"; |
| case PERF_COUNT_HW_REF_CPU_CYCLES: |
| return "PERF_COUNT_HW_REF_CPU_CYCLES"; |
| default: |
| return "UNKNOWN HARDWARE COUNTER"; |
| } |
| |
| case PERF_TYPE_SOFTWARE: |
| switch (perf_config.config) |
| { |
| case PERF_COUNT_SW_CPU_CLOCK: |
| return "PERF_COUNT_SW_CPU_CLOCK"; |
| case PERF_COUNT_SW_TASK_CLOCK: |
| return "PERF_COUNT_SW_TASK_CLOCK"; |
| case PERF_COUNT_SW_PAGE_FAULTS: |
| return "PERF_COUNT_SW_PAGE_FAULTS"; |
| case PERF_COUNT_SW_CONTEXT_SWITCHES: |
| return "PERF_COUNT_SW_CONTEXT_SWITCHES"; |
| case PERF_COUNT_SW_CPU_MIGRATIONS: |
| return "PERF_COUNT_SW_CPU_MIGRATIONS"; |
| case PERF_COUNT_SW_PAGE_FAULTS_MIN: |
| return "PERF_COUNT_SW_PAGE_FAULTS_MIN"; |
| case PERF_COUNT_SW_PAGE_FAULTS_MAJ: |
| return "PERF_COUNT_SW_PAGE_FAULTS_MAJ"; |
| case PERF_COUNT_SW_ALIGNMENT_FAULTS: |
| return "PERF_COUNT_SW_ALIGNMENT_FAULTS"; |
| case PERF_COUNT_SW_EMULATION_FAULTS: |
| return "PERF_COUNT_SW_EMULATION_FAULTS"; |
| case PERF_COUNT_SW_DUMMY: |
| return "PERF_COUNT_SW_DUMMY"; |
| default: |
| return "UNKNOWN SOFTWARE COUNTER"; |
| } |
| default: |
| return std::to_string(perf_config.config); |
| } |
| } |