1 /*
2 * Copyright (C) 2015 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 #include "event_type.h"
18
19 #include <unistd.h>
20 #include <algorithm>
21 #include <string>
22 #include <vector>
23
24 #include <android-base/file.h>
25 #include <android-base/logging.h>
26
27 #include "event_attr.h"
28 #include "utils.h"
29
30 #define EVENT_TYPE_TABLE_ENTRY(name, type, config) {name, type, config},
31
32 static const std::vector<EventType> static_event_type_array = {
33 #include "event_type_table.h"
34 };
35
GetTracepointEventTypes()36 static const std::vector<EventType> GetTracepointEventTypes() {
37 std::vector<EventType> result;
38 if (!IsRoot()) {
39 // Not having permission to profile tracing events.
40 return result;
41 }
42 const std::string tracepoint_dirname = "/sys/kernel/debug/tracing/events";
43 for (const auto& system_name : GetSubDirs(tracepoint_dirname)) {
44 std::string system_path = tracepoint_dirname + "/" + system_name;
45 for (const auto& event_name : GetSubDirs(system_path)) {
46 std::string id_path = system_path + "/" + event_name + "/id";
47 std::string id_content;
48 if (!android::base::ReadFileToString(id_path, &id_content)) {
49 continue;
50 }
51 char* endptr;
52 uint64_t id = strtoull(id_content.c_str(), &endptr, 10);
53 if (endptr == id_content.c_str()) {
54 LOG(DEBUG) << "unexpected id '" << id_content << "' in " << id_path;
55 continue;
56 }
57 result.push_back(EventType(system_name + ":" + event_name, PERF_TYPE_TRACEPOINT, id));
58 }
59 }
60 std::sort(result.begin(), result.end(),
61 [](const EventType& type1, const EventType& type2) { return type1.name < type2.name; });
62 return result;
63 }
64
GetAllEventTypes()65 const std::vector<EventType>& GetAllEventTypes() {
66 static std::vector<EventType> event_type_array;
67 if (event_type_array.empty()) {
68 event_type_array.insert(event_type_array.end(), static_event_type_array.begin(),
69 static_event_type_array.end());
70 const std::vector<EventType> tracepoint_array = GetTracepointEventTypes();
71 event_type_array.insert(event_type_array.end(), tracepoint_array.begin(),
72 tracepoint_array.end());
73 }
74 return event_type_array;
75 }
76
FindEventTypeByName(const std::string & name)77 const EventType* FindEventTypeByName(const std::string& name) {
78 const EventType* result = nullptr;
79 for (auto& event_type : GetAllEventTypes()) {
80 if (event_type.name == name) {
81 result = &event_type;
82 break;
83 }
84 }
85 if (result == nullptr) {
86 LOG(ERROR) << "Unknown event_type '" << name
87 << "', try `simpleperf list` to list all possible event type names";
88 return nullptr;
89 }
90 return result;
91 }
92
ParseEventType(const std::string & event_type_str)93 std::unique_ptr<EventTypeAndModifier> ParseEventType(const std::string& event_type_str) {
94 static std::string modifier_characters = "ukhGHp";
95 std::unique_ptr<EventTypeAndModifier> event_type_modifier(new EventTypeAndModifier);
96 event_type_modifier->name = event_type_str;
97 std::string event_type_name = event_type_str;
98 std::string modifier;
99 size_t comm_pos = event_type_str.rfind(':');
100 if (comm_pos != std::string::npos) {
101 bool match_modifier = true;
102 for (size_t i = comm_pos + 1; i < event_type_str.size(); ++i) {
103 char c = event_type_str[i];
104 if (c != ' ' && modifier_characters.find(c) == std::string::npos) {
105 match_modifier = false;
106 break;
107 }
108 }
109 if (match_modifier) {
110 event_type_name = event_type_str.substr(0, comm_pos);
111 modifier = event_type_str.substr(comm_pos + 1);
112 }
113 }
114 const EventType* event_type = FindEventTypeByName(event_type_name);
115 if (event_type == nullptr) {
116 // Try if the modifier belongs to the event type name, like some tracepoint events.
117 if (!modifier.empty()) {
118 event_type_name = event_type_str;
119 modifier.clear();
120 event_type = FindEventTypeByName(event_type_name);
121 }
122 if (event_type == nullptr) {
123 return nullptr;
124 }
125 }
126 event_type_modifier->event_type = *event_type;
127 if (modifier.find_first_of("ukh") != std::string::npos) {
128 event_type_modifier->exclude_user = true;
129 event_type_modifier->exclude_kernel = true;
130 event_type_modifier->exclude_hv = true;
131 }
132 if (modifier.find_first_of("GH") != std::string::npos) {
133 event_type_modifier->exclude_guest = true;
134 event_type_modifier->exclude_host = true;
135 }
136
137 for (auto& c : modifier) {
138 switch (c) {
139 case 'u':
140 event_type_modifier->exclude_user = false;
141 break;
142 case 'k':
143 event_type_modifier->exclude_kernel = false;
144 break;
145 case 'h':
146 event_type_modifier->exclude_hv = false;
147 break;
148 case 'G':
149 event_type_modifier->exclude_guest = false;
150 break;
151 case 'H':
152 event_type_modifier->exclude_host = false;
153 break;
154 case 'p':
155 event_type_modifier->precise_ip++;
156 break;
157 case ' ':
158 break;
159 default:
160 LOG(ERROR) << "Unknown event type modifier '" << c << "'";
161 }
162 }
163 event_type_modifier->modifier = modifier;
164 return event_type_modifier;
165 }
166