1 //
2 // Copyright (C) 2020 The Android Open Source Project
3 //
4 // Licensed under the Apache License, Version 2.0 (the "License");
5 // you may not use this file except in compliance with the License.
6 // You may obtain a copy of the License at
7 //
8 // http://www.apache.org/licenses/LICENSE-2.0
9 //
10 // Unless required by applicable law or agreed to in writing, software
11 // distributed under the License is distributed on an "AS IS" BASIS,
12 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 // See the License for the specific language governing permissions and
14 // limitations under the License.
15 //
16 //
17
18 #include <stdio.h>
19
20 #include <android-base/logging.h>
21 #include <android-base/properties.h>
22
23 #include "event_attr.h"
24 #include "event_fd.h"
25 #include "event_type.h"
26 #include "test_util.h"
27
IsInNativeAbi()28 bool IsInNativeAbi() {
29 static int in_native_abi = -1;
30 if (in_native_abi == -1) {
31 FILE* fp = popen("uname -m", "re");
32 char buf[40];
33 memset(buf, '\0', sizeof(buf));
34 CHECK_EQ(fgets(buf, sizeof(buf), fp), buf);
35 pclose(fp);
36 std::string s = buf;
37 in_native_abi = 1;
38 if (GetBuildArch() == ARCH_X86_32 || GetBuildArch() == ARCH_X86_64) {
39 if (s.find("86") == std::string::npos) {
40 in_native_abi = 0;
41 }
42 } else if (GetBuildArch() == ARCH_ARM || GetBuildArch() == ARCH_ARM64) {
43 if (s.find("arm") == std::string::npos && s.find("aarch64") == std::string::npos) {
44 in_native_abi = 0;
45 }
46 }
47 }
48 return in_native_abi == 1;
49 }
50
51 #if defined(__arm__)
52 // Check if we can get a non-zero instruction event count by monitoring current thread.
HasNonZeroInstructionEventCount()53 static bool HasNonZeroInstructionEventCount() {
54 const simpleperf::EventType* type = simpleperf::FindEventTypeByName("instructions", false);
55 if (type == nullptr) {
56 return false;
57 }
58 perf_event_attr attr = CreateDefaultPerfEventAttr(*type);
59 std::unique_ptr<EventFd> event_fd =
60 EventFd::OpenEventFile(attr, gettid(), -1, nullptr, type->name, false);
61 if (!event_fd) {
62 return false;
63 }
64 // do some cpu work.
65 for (volatile int i = 0; i < 100000; ++i) {
66 }
67 PerfCounter counter;
68 if (event_fd->ReadCounter(&counter)) {
69 return counter.value != 0;
70 }
71 return false;
72 }
73 #endif // defined(__arm__)
74
HasHardwareCounter()75 bool HasHardwareCounter() {
76 #if defined(__linux__)
77 static int has_hw_counter = -1;
78 if (has_hw_counter == -1) {
79 has_hw_counter = 1;
80 #if defined(__x86__) || defined(__x86_64__)
81 // On x86 and x86_64, it's likely to run on an emulator or vm without hardware perf counters.
82 // It's hard to enumerate them all. So check the support at runtime.
83 const simpleperf::EventType* type = simpleperf::FindEventTypeByName("cpu-cycles", false);
84 CHECK(type != nullptr);
85 perf_event_attr attr = CreateDefaultPerfEventAttr(*type);
86 has_hw_counter = IsEventAttrSupported(attr, "cpu-cycles") ? 1 : 0;
87 #elif defined(__arm__)
88 // For arm32 devices, external non-invasive debug signal controls PMU counters. Once it is
89 // disabled for security reason, we always get zero values for PMU counters. And we want to
90 // skip hardware counter tests once we detect it.
91 has_hw_counter &= HasNonZeroInstructionEventCount() ? 1 : 0;
92 #endif // defined(__arm__)
93 }
94 return has_hw_counter == 1;
95 #else // defined(__linux__)
96 return false;
97 #endif // defined(__linux__)
98 }
99
HasPmuCounter()100 bool HasPmuCounter() {
101 static int has_pmu_counter = -1;
102 if (has_pmu_counter == -1) {
103 has_pmu_counter = 0;
104 auto callback = [&](const simpleperf::EventType& event_type) {
105 if (event_type.IsPmuEvent()) {
106 has_pmu_counter = 1;
107 return false;
108 }
109 return true;
110 };
111 simpleperf::EventTypeManager::Instance().ForEachType(callback);
112 }
113 return has_pmu_counter == 1;
114 }
115
HasTracepointEvents()116 bool HasTracepointEvents() {
117 static int has_tracepoint_events = -1;
118 if (has_tracepoint_events == -1) {
119 has_tracepoint_events = (GetTraceFsDir() != nullptr) ? 1 : 0;
120 }
121 return has_tracepoint_events == 1;
122 }
123