1 /*
2 * Copyright (C) 2018 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 <android-base/file.h>
18 #include <android-base/logging.h>
19 #include <android-base/stringprintf.h>
20
21 #include "AtraceDevice.h"
22
23 namespace android {
24 namespace hardware {
25 namespace atrace {
26 namespace V1_0 {
27 namespace implementation {
28
29 using ::android::hardware::atrace::V1_0::Status;
30 using ::android::hardware::atrace::V1_0::TracingCategory;
31
32 struct TracingConfig {
33 std::string description;
34 // path and if error on failure
35 std::vector<std::pair<std::string, bool>> paths;
36 };
37
38 // This is a map stores categories and their sysfs paths with required flags
39 const std::map<std::string, TracingConfig> kTracingMap = {
40 // gfx
41 {
42 "gfx",
43 {"Graphics", {{"mdss", false}, {"sde", false}, {"mali_systrace", false}}},
44 },
45 {
46 "ion",
47 {"ION allocation", {{"kmem/ion_alloc_buffer_start", false}}},
48 },
49 };
50
51 // Methods from ::android::hardware::atrace::V1_0::IAtraceDevice follow.
listCategories(listCategories_cb _hidl_cb)52 Return<void> AtraceDevice::listCategories(listCategories_cb _hidl_cb) {
53 hidl_vec<TracingCategory> categories;
54 categories.resize(kTracingMap.size());
55 std::size_t i = 0;
56 for (auto& c : kTracingMap) {
57 categories[i].name = c.first;
58 categories[i].description = c.second.description;
59 i++;
60 }
61 _hidl_cb(categories);
62 return Void();
63 }
64
AtraceDevice()65 AtraceDevice::AtraceDevice() {
66 struct stat st;
67
68 tracefs_event_root_ = "/sys/kernel/tracing/events/";
69 if (stat(tracefs_event_root_.c_str(), &st) != 0) {
70 tracefs_event_root_ = "/sys/kernel/debug/tracing/events/";
71 CHECK(stat(tracefs_event_root_.c_str(), &st) == 0) << "tracefs must be mounted at either"
72 "/sys/kernel/tracing or "
73 "/sys/kernel/debug/tracing";
74 }
75 }
76
enableCategories(const hidl_vec<hidl_string> & categories)77 Return<::android::hardware::atrace::V1_0::Status> AtraceDevice::enableCategories(
78 const hidl_vec<hidl_string>& categories) {
79 if (!categories.size()) {
80 return Status::ERROR_INVALID_ARGUMENT;
81 }
82
83 for (auto& c : categories) {
84 if (kTracingMap.count(c)) {
85 for (auto& p : kTracingMap.at(c).paths) {
86 std::string tracefs_event_enable_path = android::base::StringPrintf(
87 "%s%s/enable", tracefs_event_root_.c_str(), p.first.c_str());
88 if (!android::base::WriteStringToFile("1", tracefs_event_enable_path)) {
89 LOG(ERROR) << "Failed to enable tracing on: " << tracefs_event_enable_path;
90 if (p.second) {
91 // disable before return
92 disableAllCategories();
93 return Status::ERROR_TRACING_POINT;
94 }
95 }
96 }
97 } else {
98 return Status::ERROR_INVALID_ARGUMENT;
99 }
100 }
101 return Status::SUCCESS;
102 }
103
disableAllCategories()104 Return<::android::hardware::atrace::V1_0::Status> AtraceDevice::disableAllCategories() {
105 auto ret = Status::SUCCESS;
106
107 for (auto& c : kTracingMap) {
108 for (auto& p : c.second.paths) {
109 std::string tracefs_event_enable_path = android::base::StringPrintf(
110 "%s%s/enable", tracefs_event_root_.c_str(), p.first.c_str());
111 if (!android::base::WriteStringToFile("0", tracefs_event_enable_path)) {
112 LOG(ERROR) << "Failed to disable tracing on: " << tracefs_event_enable_path;
113 if (p.second) {
114 ret = Status::ERROR_TRACING_POINT;
115 }
116 }
117 }
118 }
119 return ret;
120 }
121
122 } // namespace implementation
123 } // namespace V1_0
124 } // namespace atrace
125 } // namespace hardware
126 } // namespace android
127