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-base/thread_annotations.h>
23 #include <android/binder_ibinder_platform.h>
24
25 #include "Util.h"
26
27 namespace aidl::android::hardware::graphics::composer3::impl {
28
Composer()29 Composer::Composer() {
30 int32_t composerInterfaceVersion = 1;
31 const auto status = getInterfaceVersion(&composerInterfaceVersion);
32 if (!status.isOk()) {
33 ALOGE("Get interface version from Composer constructor failed %s",
34 status.getDescription().c_str());
35 }
36 mHal = IComposerHal::create(composerInterfaceVersion);
37 CHECK(mHal != nullptr);
38 }
39
createClient(std::shared_ptr<IComposerClient> * outClient)40 ndk::ScopedAStatus Composer::createClient(std::shared_ptr<IComposerClient>* outClient) {
41 DEBUG_FUNC();
42 std::unique_lock<std::mutex> lock(mClientMutex);
43 ::android::base::ScopedLockAssertion lock_assertion(mClientMutex);
44 if (!waitForClientDestroyedLocked(lock)) {
45 *outClient = nullptr;
46 return TO_BINDER_STATUS(EX_NO_RESOURCES);
47 }
48
49 auto client = ndk::SharedRefBase::make<ComposerClient>(mHal.get());
50 if (!client || !client->init()) {
51 *outClient = nullptr;
52 return TO_BINDER_STATUS(EX_NO_RESOURCES);
53 }
54
55 auto clientDestroyed = [this]() { onClientDestroyed(); };
56 client->setOnClientDestroyed(clientDestroyed);
57
58 mClientAlive = true;
59 *outClient = client;
60
61 return ndk::ScopedAStatus::ok();
62 }
63
dump(int fd,const char **,uint32_t)64 binder_status_t Composer::dump(int fd, const char** /*args*/, uint32_t /*numArgs*/) {
65 std::string output;
66 mHal->dumpDebugInfo(&output);
67 write(fd, output.c_str(), output.size());
68 return STATUS_OK;
69 }
70
getCapabilities(std::vector<Capability> * caps)71 ndk::ScopedAStatus Composer::getCapabilities(std::vector<Capability>* caps) {
72 DEBUG_FUNC();
73 mHal->getCapabilities(caps);
74 return ndk::ScopedAStatus::ok();
75 }
76
waitForClientDestroyedLocked(std::unique_lock<std::mutex> & lock)77 bool Composer::waitForClientDestroyedLocked(std::unique_lock<std::mutex>& lock) {
78 if (mClientAlive) {
79 using namespace std::chrono_literals;
80
81 // In surface flinger we delete a composer client on one thread and
82 // then create a new client on another thread. Although surface
83 // flinger ensures the calls are made in that sequence (destroy and
84 // then create), sometimes the calls land in the composer service
85 // inverted (create and then destroy). Wait for a brief period to
86 // see if the existing client is destroyed.
87 LOG(DEBUG) << "waiting for previous client to be destroyed";
88 mClientDestroyedCondition.wait_for(lock, 1s, [this]() -> bool {
89 ::android::base::ScopedLockAssertion lock_assertion(mClientMutex);
90 return !mClientAlive;
91 });
92 if (mClientAlive) {
93 LOG(DEBUG) << "previous client was not destroyed";
94 }
95 }
96
97 return !mClientAlive;
98 }
99
onClientDestroyed()100 void Composer::onClientDestroyed() {
101 std::lock_guard<std::mutex> lock(mClientMutex);
102 mClientAlive = false;
103 mClientDestroyedCondition.notify_all();
104 }
105
createBinder()106 ::ndk::SpAIBinder Composer::createBinder() {
107 auto binder = BnComposer::createBinder();
108 AIBinder_setInheritRt(binder.get(), true);
109 return binder;
110 }
111
112 } // namespace aidl::android::hardware::graphics::composer3::impl
113
114