1 /*
2 * Copyright (C) 2020 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 <cputimeinstate.h>
18 #include <nativehelper/ScopedPrimitiveArray.h>
19
20 #include "LongArrayMultiStateCounter.h"
21 #include "core_jni_helpers.h"
22
23 namespace android {
24
25 static constexpr uint64_t NSEC_PER_MSEC = 1000000;
26
copyVecsToArray(JNIEnv * env,std::vector<std::vector<uint64_t>> & vec)27 static jlongArray copyVecsToArray(JNIEnv *env, std::vector<std::vector<uint64_t>> &vec) {
28 jsize s = 0;
29 for (const auto &subVec : vec) s += subVec.size();
30 jlongArray ar = env->NewLongArray(s);
31 jsize start = 0;
32 for (auto &subVec : vec) {
33 for (uint32_t i = 0; i < subVec.size(); ++i) subVec[i] /= NSEC_PER_MSEC;
34 env->SetLongArrayRegion(ar, start, subVec.size(),
35 reinterpret_cast<const jlong*>(subVec.data()));
36 start += subVec.size();
37 }
38 return ar;
39 }
40
getUidCpuFreqTimeMs(JNIEnv * env,jclass,jint uid)41 static jlongArray getUidCpuFreqTimeMs(JNIEnv *env, jclass, jint uid) {
42 auto out = android::bpf::getUidCpuFreqTimes(uid);
43 if (!out) return env->NewLongArray(0);
44 return copyVecsToArray(env, out.value());
45 }
46
47 /**
48 * Computes delta of CPU time-in-freq from the previously supplied counts and adds the delta
49 * to the supplied multi-state counter in accordance with the counter's state.
50 */
addCpuTimeInFreqDelta(jint uid,jlong counterNativePtr,jlong timestampMs,std::optional<std::vector<std::vector<uint64_t>>> timeInFreqDataNanos,jlong deltaOutContainerNativePtr)51 static jboolean addCpuTimeInFreqDelta(
52 jint uid, jlong counterNativePtr, jlong timestampMs,
53 std::optional<std::vector<std::vector<uint64_t>>> timeInFreqDataNanos,
54 jlong deltaOutContainerNativePtr) {
55 if (!timeInFreqDataNanos) {
56 return false;
57 }
58
59 battery::LongArrayMultiStateCounter *counter =
60 reinterpret_cast<battery::LongArrayMultiStateCounter *>(counterNativePtr);
61 size_t s = 0;
62 for (const auto &cluster : *timeInFreqDataNanos) s += cluster.size();
63
64 std::vector<uint64_t> flattened;
65 flattened.reserve(s);
66 auto offset = flattened.begin();
67 for (const auto &cluster : *timeInFreqDataNanos) {
68 flattened.insert(offset, cluster.begin(), cluster.end());
69 offset += cluster.size();
70 }
71 for (size_t i = 0; i < s; ++i) {
72 flattened[i] /= NSEC_PER_MSEC;
73 }
74 if (s != counter->getCount(0).size()) { // Counter has at least one state
75 ALOGE("Mismatch between eBPF data size (%d) and the counter size (%d)", (int)s,
76 (int)counter->getCount(0).size());
77 return false;
78 }
79
80 const std::vector<uint64_t> &delta = counter->updateValue(flattened, timestampMs);
81 if (deltaOutContainerNativePtr) {
82 std::vector<uint64_t> *vector =
83 reinterpret_cast<std::vector<uint64_t> *>(deltaOutContainerNativePtr);
84 *vector = delta;
85 }
86
87 return true;
88 }
89
addDeltaFromBpf(jint uid,jlong counterNativePtr,jlong timestampMs,jlong deltaOutContainerNativePtr)90 static jboolean addDeltaFromBpf(jint uid, jlong counterNativePtr, jlong timestampMs,
91 jlong deltaOutContainerNativePtr) {
92 return addCpuTimeInFreqDelta(uid, counterNativePtr, timestampMs,
93 android::bpf::getUidCpuFreqTimes(uid), deltaOutContainerNativePtr);
94 }
95
addDeltaForTest(JNIEnv * env,jclass,jint uid,jlong counterNativePtr,jlong timestampMs,jobjectArray timeInFreqDataNanos,jlong deltaOutContainerNativePtr)96 static jboolean addDeltaForTest(JNIEnv *env, jclass, jint uid, jlong counterNativePtr,
97 jlong timestampMs, jobjectArray timeInFreqDataNanos,
98 jlong deltaOutContainerNativePtr) {
99 if (!timeInFreqDataNanos) {
100 return addCpuTimeInFreqDelta(uid, counterNativePtr, timestampMs,
101 std::optional<std::vector<std::vector<uint64_t>>>(),
102 deltaOutContainerNativePtr);
103 }
104
105 std::vector<std::vector<uint64_t>> timeInFreqData;
106 jsize len = env->GetArrayLength(timeInFreqDataNanos);
107 for (jsize i = 0; i < len; i++) {
108 std::vector<uint64_t> cluster;
109 ScopedLongArrayRO row(env, (jlongArray)env->GetObjectArrayElement(timeInFreqDataNanos, i));
110 cluster.reserve(row.size());
111 for (size_t j = 0; j < row.size(); j++) {
112 cluster.push_back(row[j]);
113 }
114 timeInFreqData.push_back(cluster);
115 }
116 return addCpuTimeInFreqDelta(uid, counterNativePtr, timestampMs, std::optional(timeInFreqData),
117 deltaOutContainerNativePtr);
118 }
119
120 static const JNINativeMethod g_single_methods[] = {
121 {"readBpfData", "(I)[J", (void *)getUidCpuFreqTimeMs},
122
123 // @CriticalNative
124 {"addDeltaFromBpf", "(IJJJ)Z", (void *)addDeltaFromBpf},
125
126 // Used for testing
127 {"addDeltaForTest", "(IJJ[[JJ)Z", (void *)addDeltaForTest},
128 };
129
register_com_android_internal_os_KernelSingleUidTimeReader(JNIEnv * env)130 int register_com_android_internal_os_KernelSingleUidTimeReader(JNIEnv *env) {
131 return RegisterMethodsOrDie(env, "com/android/internal/os/KernelSingleUidTimeReader$Injector",
132 g_single_methods, NELEM(g_single_methods));
133 }
134
135 }
136