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Diffstat (limited to 'tests/framework/instruments/PMU.cpp')
-rw-r--r-- | tests/framework/instruments/PMU.cpp | 99 |
1 files changed, 99 insertions, 0 deletions
diff --git a/tests/framework/instruments/PMU.cpp b/tests/framework/instruments/PMU.cpp new file mode 100644 index 0000000000..0594e96cb2 --- /dev/null +++ b/tests/framework/instruments/PMU.cpp @@ -0,0 +1,99 @@ +/* + * Copyright (c) 2017 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.h" + +#include <asm/unistd.h> +#include <cstring> +#include <stdexcept> +#include <sys/ioctl.h> + +namespace arm_compute +{ +namespace test +{ +namespace framework +{ +PMU::PMU() + : _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; +} + +PMU::PMU(uint64_t config) + : PMU() +{ + open(config); +} + +PMU::~PMU() +{ + close(); +} + +void PMU::open(uint64_t config) +{ + _perf_config.config = config; + open(_perf_config); +} + +void PMU::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); + + ARM_COMPUTE_ERROR_ON_MSG(_fd < 0, "perf_event_open failed"); + + const int result = ioctl(_fd, PERF_EVENT_IOC_ENABLE, 0); + + ARM_COMPUTE_ERROR_ON_MSG(result == -1, "Failed to enable PMU counter: %d", errno); + ARM_COMPUTE_UNUSED(result); +} + +void PMU::close() +{ + if(_fd != -1) + { + ::close(_fd); + _fd = -1; + } +} + +void PMU::reset() +{ + const int result = ioctl(_fd, PERF_EVENT_IOC_RESET, 0); + ARM_COMPUTE_ERROR_ON_MSG(result == -1, "Failed to reset PMU counter: %d", errno); + ARM_COMPUTE_UNUSED(result); +} +} // namespace framework +} // namespace test +} // namespace arm_compute |