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 <string>
21 #include <vector>
22
23 #include <base/logging.h>
24
25 #include "event_attr.h"
26 #include "event_fd.h"
27
28 #define EVENT_TYPE_TABLE_ENTRY(name, type, config) \
29 { name, type, config } \
30 ,
31
32 static std::vector<const EventType> event_type_array = {
33 #include "event_type_table.h"
34 };
35
IsEventTypeSupportedByKernel(const EventType & event_type)36 static bool IsEventTypeSupportedByKernel(const EventType& event_type) {
37 auto event_fd = EventFd::OpenEventFileForProcess(CreateDefaultPerfEventAttr(event_type), getpid());
38 return event_fd != nullptr;
39 }
40
IsSupportedByKernel() const41 bool EventType::IsSupportedByKernel() const {
42 return IsEventTypeSupportedByKernel(*this);
43 }
44
GetAllEventTypes()45 const std::vector<const EventType>& EventTypeFactory::GetAllEventTypes() {
46 return event_type_array;
47 }
48
FindEventTypeByName(const std::string & name,bool report_unsupported_type)49 const EventType* EventTypeFactory::FindEventTypeByName(const std::string& name,
50 bool report_unsupported_type) {
51 const EventType* result = nullptr;
52 for (auto& event_type : event_type_array) {
53 if (event_type.name == name) {
54 result = &event_type;
55 break;
56 }
57 }
58 if (result == nullptr) {
59 LOG(ERROR) << "Unknown event_type '" << name
60 << "', try `simpleperf list` to list all possible event type names";
61 return nullptr;
62 }
63 if (!result->IsSupportedByKernel()) {
64 (report_unsupported_type ? PLOG(ERROR) : PLOG(DEBUG)) << "Event type '" << result->name
65 << "' is not supported by the kernel";
66 return nullptr;
67 }
68 return result;
69 }
70
FindEventTypeByConfig(uint32_t type,uint64_t config)71 const EventType* EventTypeFactory::FindEventTypeByConfig(uint32_t type, uint64_t config) {
72 for (auto& event_type : event_type_array) {
73 if (event_type.type == type && event_type.config == config) {
74 return &event_type;
75 }
76 }
77 return nullptr;
78 }
79