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      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 
     36 static 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 
     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 
     77 const 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 
     86 const 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 
    102 std::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