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/*
* Copyright (C) 2018 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include <android-base/file.h>
#include <android-base/logging.h>
#include <android-base/stringprintf.h>
#include "AtraceDevice.h"
namespace android {
namespace hardware {
namespace atrace {
namespace V1_0 {
namespace implementation {
using ::android::hardware::atrace::V1_0::Status;
using ::android::hardware::atrace::V1_0::TracingCategory;
struct TracingConfig {
std::string description;
// path and if error on failure
std::vector<std::pair<std::string, bool>> paths;
};
// This is a map stores categories and their sysfs paths with required flags
const std::map<std::string, TracingConfig> kTracingMap = {
// gfx
{
"gfx",
{"Graphics", {{"mdss", false}, {"sde", false}, {"mali_systrace", false}}},
},
{
"ion",
{"ION allocation", {{"kmem/ion_alloc_buffer_start", false}}},
},
};
// Methods from ::android::hardware::atrace::V1_0::IAtraceDevice follow.
Return<void> AtraceDevice::listCategories(listCategories_cb _hidl_cb) {
hidl_vec<TracingCategory> categories;
categories.resize(kTracingMap.size());
std::size_t i = 0;
for (auto& c : kTracingMap) {
categories[i].name = c.first;
categories[i].description = c.second.description;
i++;
}
_hidl_cb(categories);
return Void();
}
AtraceDevice::AtraceDevice() {
struct stat st;
tracefs_event_root_ = "/sys/kernel/tracing/events/";
if (stat(tracefs_event_root_.c_str(), &st) != 0) {
tracefs_event_root_ = "/sys/kernel/debug/tracing/events/";
CHECK(stat(tracefs_event_root_.c_str(), &st) == 0) << "tracefs must be mounted at either"
"/sys/kernel/tracing or "
"/sys/kernel/debug/tracing";
}
}
Return<::android::hardware::atrace::V1_0::Status> AtraceDevice::enableCategories(
const hidl_vec<hidl_string>& categories) {
if (!categories.size()) {
return Status::ERROR_INVALID_ARGUMENT;
}
for (auto& c : categories) {
if (kTracingMap.count(c)) {
for (auto& p : kTracingMap.at(c).paths) {
std::string tracefs_event_enable_path = android::base::StringPrintf(
"%s%s/enable", tracefs_event_root_.c_str(), p.first.c_str());
if (!android::base::WriteStringToFile("1", tracefs_event_enable_path)) {
LOG(ERROR) << "Failed to enable tracing on: " << tracefs_event_enable_path;
if (p.second) {
// disable before return
disableAllCategories();
return Status::ERROR_TRACING_POINT;
}
}
}
} else {
return Status::ERROR_INVALID_ARGUMENT;
}
}
return Status::SUCCESS;
}
Return<::android::hardware::atrace::V1_0::Status> AtraceDevice::disableAllCategories() {
auto ret = Status::SUCCESS;
for (auto& c : kTracingMap) {
for (auto& p : c.second.paths) {
std::string tracefs_event_enable_path = android::base::StringPrintf(
"%s%s/enable", tracefs_event_root_.c_str(), p.first.c_str());
if (!android::base::WriteStringToFile("0", tracefs_event_enable_path)) {
LOG(ERROR) << "Failed to disable tracing on: " << tracefs_event_enable_path;
if (p.second) {
ret = Status::ERROR_TRACING_POINT;
}
}
}
}
return ret;
}
} // namespace implementation
} // namespace V1_0
} // namespace atrace
} // namespace hardware
} // namespace android
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