SchedulingPolicyService.cpp revision 3ac757658dd8dc81f3b18ad1e8788640a1f2183b 
1/*
2 * Copyright (C) 2017 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#define LOG_TAG "schedulerservicehidl"
17
18#include "SchedulingPolicyService.h"
19
20#include <private/android_filesystem_config.h> // for AID_CAMERASERVER
21
22#include <log/log.h>
23#include <hwbinder/IPCThreadState.h>
24#include <mediautils/SchedulingPolicyService.h>
25
26namespace android {
27namespace frameworks {
28namespace schedulerservice {
29namespace V1_0 {
30namespace implementation {
31
32bool SchedulingPolicyService::isAllowed() {
33    using ::android::hardware::IPCThreadState;
34
35    return IPCThreadState::self()->getCallingUid() == AID_CAMERASERVER;
36}
37
38Return<bool> SchedulingPolicyService::requestPriority(int32_t pid, int32_t tid, int32_t priority) {
39    if (priority < static_cast<int32_t>(Priority::MIN) ||
40            priority > static_cast<int32_t>(Priority::MAX)) {
41        return false;
42    }
43
44    if (!isAllowed()) {
45        return false;
46    }
47
48    // TODO(b/37226359): decouple from and remove AIDL service
49    // this should always be allowed since we are in system_server.
50    int value = ::android::requestPriority(pid, tid, priority, false /* isForApp */);
51    return value == 0 /* success */;
52}
53
54Return<int32_t> SchedulingPolicyService::getMaxAllowedPriority() {
55    if (!isAllowed()) {
56        return 0;
57    }
58
59    // TODO(b/37226359): decouple from and remove AIDL service
60    return 3;
61}
62
63}  // namespace implementation
64}  // namespace V1_0
65}  // namespace schedulerservice
66}  // namespace frameworks
67}  // namespace android
68