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// Copyright 2019 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "chrome/browser/ash/arc/tracing/arc_cpu_event.h"
#include "base/logging.h"
#include "base/types/cxx23_to_underlying.h"
namespace arc {
ArcCpuEvent::ArcCpuEvent(uint64_t timestamp, Type type, uint32_t tid)
: timestamp(timestamp), type(type), tid(tid) {}
bool ArcCpuEvent::operator==(const ArcCpuEvent& other) const {
return timestamp == other.timestamp && type == other.type && tid == other.tid;
}
bool AddCpuEvent(CpuEvents* cpu_events,
uint64_t timestamp,
ArcCpuEvent::Type type,
uint32_t tid) {
// Base validation.
switch (type) {
case ArcCpuEvent::Type::kIdleIn:
case ArcCpuEvent::Type::kIdleOut:
if (tid) {
LOG(ERROR) << "Idle should always be bound to the idle process";
return false;
}
break;
case ArcCpuEvent::Type::kWakeUp:
if (!tid) {
LOG(ERROR) << "Cannot wake-up to idle process";
return false;
}
break;
case ArcCpuEvent::Type::kActive:
break;
}
if (cpu_events->empty()) {
cpu_events->emplace_back(timestamp, type, tid);
return true;
}
// Verify new event relative to the last event.
const ArcCpuEvent& last = cpu_events->back();
if (last.timestamp > timestamp) {
LOG(ERROR) << "Time sequence is broken for cpu events: " << last.timestamp
<< " vs " << timestamp;
return false;
}
// Check transitions from->to.
switch (last.type) {
case ArcCpuEvent::Type::kIdleIn:
switch (type) {
case ArcCpuEvent::Type::kIdleOut:
break;
case ArcCpuEvent::Type::kWakeUp:
break;
default:
LOG(ERROR) << "Unknown CPU transition: " << last.type << "=>" << type;
return false;
}
break;
case ArcCpuEvent::Type::kIdleOut:
switch (type) {
case ArcCpuEvent::Type::kIdleIn:
break;
case ArcCpuEvent::Type::kWakeUp:
break;
case ArcCpuEvent::Type::kActive:
break;
default:
LOG(ERROR) << "Unknown CPU transition: " << last.type << "=>" << type;
return false;
}
break;
case ArcCpuEvent::Type::kWakeUp:
switch (type) {
case ArcCpuEvent::Type::kIdleIn:
break;
case ArcCpuEvent::Type::kIdleOut:
break;
case ArcCpuEvent::Type::kWakeUp:
break;
case ArcCpuEvent::Type::kActive:
break;
default:
LOG(ERROR) << "Unknown CPU transition: " << last.type << "=>" << type;
return false;
}
break;
case ArcCpuEvent::Type::kActive:
switch (type) {
case ArcCpuEvent::Type::kIdleIn:
break;
case ArcCpuEvent::Type::kWakeUp:
break;
case ArcCpuEvent::Type::kActive:
break;
default:
LOG(ERROR) << "Unknown CPU transition: " << last.type << "=>" << type;
return false;
}
break;
}
cpu_events->emplace_back(timestamp, type, tid);
return true;
}
bool AddAllCpuEvent(AllCpuEvents* all_cpu_events,
uint32_t cpu_id,
uint64_t timestamp,
ArcCpuEvent::Type type,
uint32_t tid) {
if (all_cpu_events->size() <= cpu_id) {
all_cpu_events->resize(cpu_id + 1);
}
return AddCpuEvent(&(*all_cpu_events)[cpu_id], timestamp, type, tid);
}
base::Value::List SerializeCpuEvents(const CpuEvents& cpu_events) {
base::Value::List list;
for (const auto& event : cpu_events) {
base::Value::List event_value;
event_value.Append(base::Value(static_cast<int>(event.type)));
event_value.Append(base::Value(static_cast<double>(event.timestamp)));
event_value.Append(base::Value(static_cast<int>(event.tid)));
list.Append(std::move(event_value));
}
return list;
}
base::Value::List SerializeAllCpuEvents(const AllCpuEvents& all_cpu_events) {
base::Value::List list;
for (const auto& cpu_events : all_cpu_events) {
list.Append(SerializeCpuEvents(cpu_events));
}
return list;
}
bool LoadCpuEvents(const base::Value* value, CpuEvents* cpu_events) {
if (!value || !value->is_list()) {
return false;
}
uint64_t previous_timestamp = 0;
for (const auto& entry : value->GetList()) {
if (!entry.is_list() || entry.GetList().size() != 3) {
return false;
}
if (!entry.GetList()[0].is_int()) {
return false;
}
const ArcCpuEvent::Type type =
static_cast<ArcCpuEvent::Type>(entry.GetList()[0].GetInt());
switch (type) {
case ArcCpuEvent::Type::kIdleIn:
case ArcCpuEvent::Type::kIdleOut:
case ArcCpuEvent::Type::kWakeUp:
case ArcCpuEvent::Type::kActive:
break;
default:
return false;
}
if (!entry.GetList()[1].is_double() && !entry.GetList()[1].is_int()) {
return false;
}
const uint64_t timestamp = entry.GetList()[1].GetDouble();
if (timestamp < previous_timestamp) {
return false;
}
if (!entry.GetList()[2].is_int()) {
return false;
}
const int tid = entry.GetList()[2].GetInt();
cpu_events->emplace_back(timestamp, type, tid);
previous_timestamp = timestamp;
}
return true;
}
bool LoadAllCpuEvents(const base::Value* value, AllCpuEvents* all_cpu_events) {
if (!value || !value->is_list()) {
return false;
}
for (const auto& entry : value->GetList()) {
CpuEvents cpu_events;
if (!LoadCpuEvents(&entry, &cpu_events)) {
return false;
}
all_cpu_events->emplace_back(std::move(cpu_events));
}
return true;
}
std::ostream& operator<<(std::ostream& os, ArcCpuEvent::Type event_type) {
return os << base::to_underlying(event_type);
}
} // namespace arc
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