103 lines
2.7 KiB
C++
103 lines
2.7 KiB
C++
/*
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* Copyright (c) 2017-2019 Arm Limited.
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*
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* SPDX-License-Identifier: MIT
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to
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* deal in the Software without restriction, including without limitation the
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* rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
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* sell copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in all
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* copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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* SOFTWARE.
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*/
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#include "PMU.h"
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#include <asm/unistd.h>
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#include <cstring>
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#include <stdexcept>
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#include <sys/ioctl.h>
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namespace arm_compute
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{
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namespace test
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{
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namespace framework
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{
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PMU::PMU()
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: _perf_config()
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{
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_perf_config.type = PERF_TYPE_HARDWARE;
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_perf_config.size = sizeof(perf_event_attr);
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// Start disabled
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_perf_config.disabled = 1;
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// The inherit bit specifies that this counter should count events of child
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// tasks as well as the task specified
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_perf_config.inherit = 1;
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// Enables saving of event counts on context switch for inherited tasks
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_perf_config.inherit_stat = 1;
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}
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PMU::PMU(uint64_t config)
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: PMU()
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{
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open(config);
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}
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PMU::~PMU()
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{
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close();
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}
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void PMU::open(uint64_t config)
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{
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_perf_config.config = config;
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open(_perf_config);
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}
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void PMU::open(const perf_event_attr &perf_config)
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{
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// Measure this process/thread (+ children) on any CPU
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_fd = syscall(__NR_perf_event_open, &perf_config, 0, -1, -1, 0);
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ARM_COMPUTE_ERROR_ON_MSG(_fd < 0, "perf_event_open failed");
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const int result = ioctl(_fd, PERF_EVENT_IOC_ENABLE, 0);
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if(result == -1)
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{
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ARM_COMPUTE_ERROR_VAR("Failed to enable PMU counter: %d", errno);
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}
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}
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void PMU::close()
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{
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if(_fd != -1)
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{
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::close(_fd);
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_fd = -1;
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}
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}
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void PMU::reset()
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{
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const int result = ioctl(_fd, PERF_EVENT_IOC_RESET, 0);
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if(result == -1)
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{
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ARM_COMPUTE_ERROR_VAR("Failed to reset PMU counter: %d", errno);
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}
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}
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} // namespace framework
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} // namespace test
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} // namespace arm_compute
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