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//
// Copyright (C) 2020 The Android Open Source Project
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//
//
#include <stdio.h>
#include <optional>
#include <android-base/logging.h>
#include <android-base/properties.h>
#include "command.h"
#include "event_attr.h"
#include "event_fd.h"
#include "event_type.h"
#include "record_file.h"
#include "test_util.h"
#if defined(__linux__)
static std::optional<bool> CanSampleRegsFor32BitABI() {
std::vector<std::unique_ptr<Workload>> workloads;
CreateProcesses(1, &workloads);
std::string pid = std::to_string(workloads[0]->GetPid());
std::unique_ptr<Command> cmd = CreateCommandInstance("record");
TemporaryFile tmpfile;
if (!cmd->Run({"-p", pid, "--call-graph", "dwarf,8", "--no-unwind", "-e", "cpu-clock:u",
"--duration", "3", "-o", tmpfile.path})) {
return std::nullopt;
}
auto reader = RecordFileReader::CreateInstance(tmpfile.path);
if (!reader) {
return std::nullopt;
}
for (const std::unique_ptr<Record>& record : reader->DataSection()) {
if (record->type() == PERF_RECORD_SAMPLE) {
auto sample = static_cast<const SampleRecord*>(record.get());
if (sample->regs_user_data.abi == PERF_SAMPLE_REGS_ABI_32) {
return true;
}
}
}
return false;
}
std::optional<bool> IsInNativeAbi() {
static int in_native_abi = -1;
if (in_native_abi == -1) {
FILE* fp = popen("uname -m", "re");
char buf[40];
memset(buf, '\0', sizeof(buf));
CHECK_EQ(fgets(buf, sizeof(buf), fp), buf);
pclose(fp);
std::string s = buf;
in_native_abi = 1;
if (GetTargetArch() == ARCH_X86_32 || GetTargetArch() == ARCH_X86_64) {
if (s.find("86") == std::string::npos) {
in_native_abi = 0;
}
} else if (GetTargetArch() == ARCH_ARM || GetTargetArch() == ARCH_ARM64) {
if (s.find("arm") == std::string::npos && s.find("aarch64") == std::string::npos) {
in_native_abi = 0;
}
if (GetTargetArch() == ARCH_ARM) {
// If we can't get ARM registers in samples, probably we are running with a 32-bit
// translator on 64-bit only CPUs. Then we should make in_native_abi = 0.
if (auto result = CanSampleRegsFor32BitABI(); result.has_value()) {
in_native_abi = result.value() ? 1 : 0;
} else {
in_native_abi = 2;
}
}
} else if (GetTargetArch() == ARCH_RISCV64) {
if (s.find("riscv") == std::string::npos) {
in_native_abi = 0;
}
}
}
if (in_native_abi == 2) {
return std::nullopt;
}
return in_native_abi == 1;
}
// Check if we can get a non-zero instruction event count by monitoring current thread.
static bool HasNonZeroInstructionEventCount() {
const simpleperf::EventType* type = simpleperf::FindEventTypeByName("instructions", false);
if (type == nullptr) {
return false;
}
perf_event_attr attr = CreateDefaultPerfEventAttr(*type);
std::unique_ptr<EventFd> event_fd =
EventFd::OpenEventFile(attr, gettid(), -1, nullptr, type->name, false);
if (!event_fd) {
return false;
}
// do some cpu work.
for (volatile int i = 0; i < 100000; ++i) {
}
PerfCounter counter;
if (event_fd->ReadCounter(&counter)) {
return counter.value != 0;
}
return false;
}
bool IsInEmulator() {
std::string fingerprint = android::base::GetProperty("ro.system.build.fingerprint", "");
return android::base::StartsWith(fingerprint, "google/sdk_gphone") ||
android::base::StartsWith(fingerprint, "google/sdk_gpc") ||
android::base::StartsWith(fingerprint, "generic/cf") ||
android::base::StartsWith(fingerprint, "generic/aosp_cf");
}
bool HasHardwareCounter() {
static int has_hw_counter = -1;
if (has_hw_counter == -1) {
has_hw_counter = 1;
auto arch = GetTargetArch();
bool in_native_abi = IsInNativeAbi() == std::optional(true);
if (arch == ARCH_X86_64 || arch == ARCH_X86_32 || !in_native_abi || IsInEmulator()) {
// On x86 and x86_64, or when we are not in native abi, it's likely to run on an emulator or
// vm without hardware perf counters. It's hard to enumerate them all. So check the support
// at runtime.
const simpleperf::EventType* type = simpleperf::FindEventTypeByName("cpu-cycles", false);
CHECK(type != nullptr);
perf_event_attr attr = CreateDefaultPerfEventAttr(*type);
has_hw_counter = IsEventAttrSupported(attr, "cpu-cycles") ? 1 : 0;
} else if (arch == ARCH_ARM) {
// For arm32 devices, external non-invasive debug signal controls PMU counters. Once it is
// disabled for security reason, we always get zero values for PMU counters. And we want to
// skip hardware counter tests once we detect it.
has_hw_counter &= HasNonZeroInstructionEventCount() ? 1 : 0;
}
}
return has_hw_counter == 1;
}
#else // !defined(__linux__)
bool HasHardwareCounter() {
return false;
}
#endif // !defined(__linux__)
bool HasPmuCounter() {
static int has_pmu_counter = -1;
if (has_pmu_counter == -1) {
has_pmu_counter = 0;
auto callback = [&](const simpleperf::EventType& event_type) {
if (event_type.IsPmuEvent()) {
has_pmu_counter = 1;
return false;
}
return true;
};
simpleperf::EventTypeManager::Instance().ForEachType(callback);
}
return has_pmu_counter == 1;
}
bool HasTracepointEvents() {
static int has_tracepoint_events = -1;
if (has_tracepoint_events == -1) {
has_tracepoint_events = 0;
if (const char* dir = GetTraceFsDir(); dir != nullptr) {
if (IsDir(std::string(dir) + "/events/sched/sched_switch")) {
has_tracepoint_events = 1;
}
}
}
return has_tracepoint_events == 1;
}
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