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
32static const std::vector<EventType> static_event_type_array = {
33#include "event_type_table.h"
34};
35
36static const std::vector<EventType> GetTracepointEventTypes() {
37  std::vector<EventType> result;
38  const std::string tracepoint_dirname = "/sys/kernel/debug/tracing/events";
39  std::vector<std::string> system_dirs;
40  GetEntriesInDir(tracepoint_dirname, nullptr, &system_dirs);
41  for (auto& system_name : system_dirs) {
42    std::string system_path = tracepoint_dirname + "/" + system_name;
43    std::vector<std::string> event_dirs;
44    GetEntriesInDir(system_path, nullptr, &event_dirs);
45    for (auto& event_name : event_dirs) {
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
65const 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
77const EventType* FindEventTypeByConfig(uint32_t type, uint64_t config) {
78  for (auto& event_type : GetAllEventTypes()) {
79    if (event_type.type == type && event_type.config == config) {
80      return &event_type;
81    }
82  }
83  return nullptr;
84}
85
86const EventType* FindEventTypeByName(const std::string& name) {
87  const EventType* result = nullptr;
88  for (auto& event_type : GetAllEventTypes()) {
89    if (event_type.name == name) {
90      result = &event_type;
91      break;
92    }
93  }
94  if (result == nullptr) {
95    LOG(ERROR) << "Unknown event_type '" << name
96               << "', try `simpleperf list` to list all possible event type names";
97    return nullptr;
98  }
99  return result;
100}
101
102std::unique_ptr<EventTypeAndModifier> ParseEventType(const std::string& event_type_str) {
103  static std::string modifier_characters = "ukhGHp";
104  std::unique_ptr<EventTypeAndModifier> event_type_modifier(new EventTypeAndModifier);
105  event_type_modifier->name = event_type_str;
106  std::string event_type_name = event_type_str;
107  std::string modifier;
108  size_t comm_pos = event_type_str.rfind(':');
109  if (comm_pos != std::string::npos) {
110    bool match_modifier = true;
111    for (size_t i = comm_pos + 1; i < event_type_str.size(); ++i) {
112      char c = event_type_str[i];
113      if (c != ' ' && modifier_characters.find(c) == std::string::npos) {
114        match_modifier = false;
115        break;
116      }
117    }
118    if (match_modifier) {
119      event_type_name = event_type_str.substr(0, comm_pos);
120      modifier = event_type_str.substr(comm_pos + 1);
121    }
122  }
123  const EventType* event_type = FindEventTypeByName(event_type_name);
124  if (event_type == nullptr) {
125    // Try if the modifier belongs to the event type name, like some tracepoint events.
126    if (!modifier.empty()) {
127      event_type_name = event_type_str;
128      modifier.clear();
129      event_type = FindEventTypeByName(event_type_name);
130    }
131    if (event_type == nullptr) {
132      return nullptr;
133    }
134  }
135  event_type_modifier->event_type = *event_type;
136  if (modifier.find_first_of("ukh") != std::string::npos) {
137    event_type_modifier->exclude_user = true;
138    event_type_modifier->exclude_kernel = true;
139    event_type_modifier->exclude_hv = true;
140  }
141  if (modifier.find_first_of("GH") != std::string::npos) {
142    event_type_modifier->exclude_guest = true;
143    event_type_modifier->exclude_host = true;
144  }
145
146  for (auto& c : modifier) {
147    switch (c) {
148      case 'u':
149        event_type_modifier->exclude_user = false;
150        break;
151      case 'k':
152        event_type_modifier->exclude_kernel = false;
153        break;
154      case 'h':
155        event_type_modifier->exclude_hv = false;
156        break;
157      case 'G':
158        event_type_modifier->exclude_guest = false;
159        break;
160      case 'H':
161        event_type_modifier->exclude_host = false;
162        break;
163      case 'p':
164        event_type_modifier->precise_ip++;
165        break;
166      case ' ':
167        break;
168      default:
169        LOG(ERROR) << "Unknown event type modifier '" << c << "'";
170    }
171  }
172  event_type_modifier->modifier = modifier;
173  return event_type_modifier;
174}
175