130 lines
4.2 KiB
C++
130 lines
4.2 KiB
C++
//
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// Copyright (C) 2020 The Android Open Source Project
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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//
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//
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#include <stdio.h>
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#include <android-base/logging.h>
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#include <android-base/properties.h>
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#include "event_attr.h"
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#include "event_fd.h"
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#include "event_type.h"
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#include "test_util.h"
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bool IsInNativeAbi() {
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static int in_native_abi = -1;
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if (in_native_abi == -1) {
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FILE* fp = popen("uname -m", "re");
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char buf[40];
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memset(buf, '\0', sizeof(buf));
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CHECK_EQ(fgets(buf, sizeof(buf), fp), buf);
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pclose(fp);
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std::string s = buf;
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in_native_abi = 1;
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if (GetTargetArch() == ARCH_X86_32 || GetTargetArch() == ARCH_X86_64) {
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if (s.find("86") == std::string::npos) {
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in_native_abi = 0;
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}
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} else if (GetTargetArch() == ARCH_ARM || GetTargetArch() == ARCH_ARM64) {
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if (s.find("arm") == std::string::npos && s.find("aarch64") == std::string::npos) {
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in_native_abi = 0;
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}
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}
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}
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return in_native_abi == 1;
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}
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#if defined(__linux__)
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// Check if we can get a non-zero instruction event count by monitoring current thread.
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static bool HasNonZeroInstructionEventCount() {
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const simpleperf::EventType* type = simpleperf::FindEventTypeByName("instructions", false);
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if (type == nullptr) {
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return false;
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}
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perf_event_attr attr = CreateDefaultPerfEventAttr(*type);
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std::unique_ptr<EventFd> event_fd =
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EventFd::OpenEventFile(attr, gettid(), -1, nullptr, type->name, false);
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if (!event_fd) {
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return false;
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}
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// do some cpu work.
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for (volatile int i = 0; i < 100000; ++i) {
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}
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PerfCounter counter;
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if (event_fd->ReadCounter(&counter)) {
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return counter.value != 0;
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}
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return false;
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}
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bool HasHardwareCounter() {
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static int has_hw_counter = -1;
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if (has_hw_counter == -1) {
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has_hw_counter = 1;
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auto arch = GetTargetArch();
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std::string fingerprint = android::base::GetProperty("ro.system.build.fingerprint", "");
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bool is_emulator = android::base::StartsWith(fingerprint, "google/sdk_gphone") ||
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android::base::StartsWith(fingerprint, "google/sdk_gpc") ||
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android::base::StartsWith(fingerprint, "generic/cf");
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if (arch == ARCH_X86_64 || arch == ARCH_X86_32 || is_emulator) {
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// On x86 and x86_64, it's likely to run on an emulator or vm without hardware perf
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// counters. It's hard to enumerate them all. So check the support at runtime.
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const simpleperf::EventType* type = simpleperf::FindEventTypeByName("cpu-cycles", false);
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CHECK(type != nullptr);
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perf_event_attr attr = CreateDefaultPerfEventAttr(*type);
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has_hw_counter = IsEventAttrSupported(attr, "cpu-cycles") ? 1 : 0;
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} else if (arch == ARCH_ARM) {
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// For arm32 devices, external non-invasive debug signal controls PMU counters. Once it is
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// disabled for security reason, we always get zero values for PMU counters. And we want to
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// skip hardware counter tests once we detect it.
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has_hw_counter &= HasNonZeroInstructionEventCount() ? 1 : 0;
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}
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}
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return has_hw_counter == 1;
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}
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#else // !defined(__linux__)
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bool HasHardwareCounter() {
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return false;
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}
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#endif // !defined(__linux__)
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bool HasPmuCounter() {
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static int has_pmu_counter = -1;
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if (has_pmu_counter == -1) {
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has_pmu_counter = 0;
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auto callback = [&](const simpleperf::EventType& event_type) {
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if (event_type.IsPmuEvent()) {
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has_pmu_counter = 1;
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return false;
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}
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return true;
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};
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simpleperf::EventTypeManager::Instance().ForEachType(callback);
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}
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return has_pmu_counter == 1;
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}
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bool HasTracepointEvents() {
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static int has_tracepoint_events = -1;
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if (has_tracepoint_events == -1) {
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has_tracepoint_events = (GetTraceFsDir() != nullptr) ? 1 : 0;
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}
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return has_tracepoint_events == 1;
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}
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