1 /*
2 * Copyright (C) 2021 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 #define ATRACE_TAG (ATRACE_TAG_GRAPHICS | ATRACE_TAG_HAL)
18
19 #include "Composer.h"
20
21 #include <android-base/logging.h>
22 #include <android/binder_ibinder_platform.h>
23
24 #include "Util.h"
25
26 namespace aidl::android::hardware::graphics::composer3::impl {
27
createClient(std::shared_ptr<IComposerClient> * outClient)28 ndk::ScopedAStatus Composer::createClient(std::shared_ptr<IComposerClient>* outClient) {
29 DEBUG_FUNC();
30 std::unique_lock<std::mutex> lock(mClientMutex);
31 if (!waitForClientDestroyedLocked(lock)) {
32 *outClient = nullptr;
33 return TO_BINDER_STATUS(EX_NO_RESOURCES);
34 }
35
36 auto client = ndk::SharedRefBase::make<ComposerClient>(mHal.get());
37 if (!client || !client->init()) {
38 *outClient = nullptr;
39 return TO_BINDER_STATUS(EX_NO_RESOURCES);
40 }
41
42 auto clientDestroyed = [this]() { onClientDestroyed(); };
43 client->setOnClientDestroyed(clientDestroyed);
44
45 mClientAlive = true;
46 *outClient = client;
47
48 return ndk::ScopedAStatus::ok();
49 }
50
dump(int fd,const char **,uint32_t)51 binder_status_t Composer::dump(int fd, const char** /*args*/, uint32_t /*numArgs*/) {
52 std::string output;
53 mHal->dumpDebugInfo(&output);
54 write(fd, output.c_str(), output.size());
55 return STATUS_OK;
56 }
57
getCapabilities(std::vector<Capability> * caps)58 ndk::ScopedAStatus Composer::getCapabilities(std::vector<Capability>* caps) {
59 DEBUG_FUNC();
60 mHal->getCapabilities(caps);
61 return ndk::ScopedAStatus::ok();
62 }
63
waitForClientDestroyedLocked(std::unique_lock<std::mutex> & lock)64 bool Composer::waitForClientDestroyedLocked(std::unique_lock<std::mutex>& lock) {
65 if (mClientAlive) {
66 using namespace std::chrono_literals;
67
68 // In surface flinger we delete a composer client on one thread and
69 // then create a new client on another thread. Although surface
70 // flinger ensures the calls are made in that sequence (destroy and
71 // then create), sometimes the calls land in the composer service
72 // inverted (create and then destroy). Wait for a brief period to
73 // see if the existing client is destroyed.
74 LOG(DEBUG) << "waiting for previous client to be destroyed";
75 mClientDestroyedCondition.wait_for(lock, 1s,
76 [this]() -> bool { return !mClientAlive; });
77 if (mClientAlive) {
78 LOG(DEBUG) << "previous client was not destroyed";
79 }
80 }
81
82 return !mClientAlive;
83 }
84
onClientDestroyed()85 void Composer::onClientDestroyed() {
86 std::lock_guard<std::mutex> lock(mClientMutex);
87 mClientAlive = false;
88 mClientDestroyedCondition.notify_all();
89 }
90
createBinder()91 ::ndk::SpAIBinder Composer::createBinder() {
92 auto binder = BnComposer::createBinder();
93 AIBinder_setInheritRt(binder.get(), true);
94 return binder;
95 }
96
97 } // namespace aidl::android::hardware::graphics::composer3::impl
98
99