/*
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* Copyright (C) 2018 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include <array>
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#include <iomanip>
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#include <random>
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#include <sstream>
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#include <android/hardware_buffer.h>
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#include <bufferhub/BufferHubService.h>
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#include <cutils/native_handle.h>
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#include <log/log.h>
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#include <openssl/hmac.h>
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#include <system/graphics-base.h>
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#include <ui/BufferHubDefs.h>
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using ::android::BufferHubDefs::MetadataHeader;
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using ::android::hardware::Void;
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namespace android {
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namespace frameworks {
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namespace bufferhub {
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namespace V1_0 {
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namespace implementation {
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BufferHubService::BufferHubService() {
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std::mt19937_64 randomEngine;
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randomEngine.seed(time(nullptr));
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mKey = randomEngine();
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}
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Return<void> BufferHubService::allocateBuffer(const HardwareBufferDescription& description,
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const uint32_t userMetadataSize,
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allocateBuffer_cb _hidl_cb) {
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AHardwareBuffer_Desc desc;
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memcpy(&desc, &description, sizeof(AHardwareBuffer_Desc));
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std::shared_ptr<BufferNode> node =
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std::make_shared<BufferNode>(desc.width, desc.height, desc.layers, desc.format,
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desc.usage, userMetadataSize,
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BufferHubIdGenerator::getInstance().getId());
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if (node == nullptr || !node->isValid()) {
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ALOGE("%s: creating BufferNode failed.", __FUNCTION__);
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_hidl_cb(/*status=*/BufferHubStatus::ALLOCATION_FAILED, /*bufferClient=*/nullptr,
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/*bufferTraits=*/{});
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return Void();
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}
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sp<BufferClient> client = BufferClient::create(this, node);
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// Add it to list for bookkeeping and dumpsys.
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std::lock_guard<std::mutex> lock(mClientSetMutex);
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mClientSet.emplace(client);
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// Allocate memory for bufferInfo of type hidl_handle on the stack. See
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// http://aosp/286282 for the usage of NATIVE_HANDLE_DECLARE_STORAGE.
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NATIVE_HANDLE_DECLARE_STORAGE(bufferInfoStorage, BufferHubDefs::kBufferInfoNumFds,
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BufferHubDefs::kBufferInfoNumInts);
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hidl_handle bufferInfo =
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buildBufferInfo(bufferInfoStorage, node->id(), node->addNewActiveClientsBitToMask(),
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node->userMetadataSize(), node->metadata().ashmemFd(),
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node->eventFd().get());
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// During the gralloc allocation carried out by BufferNode, gralloc allocator will populate the
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// fields of its HardwareBufferDescription (i.e. strides) according to the actual
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// gralloc implementation. We need to read those fields back and send them to the client via
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// BufferTraits.
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HardwareBufferDescription allocatedBufferDesc;
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memcpy(&allocatedBufferDesc, &node->bufferDesc(), sizeof(AHardwareBuffer_Desc));
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BufferTraits bufferTraits = {/*bufferDesc=*/allocatedBufferDesc,
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/*bufferHandle=*/hidl_handle(node->bufferHandle()),
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/*bufferInfo=*/std::move(bufferInfo)};
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_hidl_cb(/*status=*/BufferHubStatus::NO_ERROR, /*bufferClient=*/client,
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/*bufferTraits=*/std::move(bufferTraits));
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return Void();
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}
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Return<void> BufferHubService::importBuffer(const hidl_handle& tokenHandle,
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importBuffer_cb _hidl_cb) {
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if (!tokenHandle.getNativeHandle() || tokenHandle->numFds != 0 || tokenHandle->numInts <= 1) {
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// nullptr handle or wrong format
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_hidl_cb(/*status=*/BufferHubStatus::INVALID_TOKEN, /*bufferClient=*/nullptr,
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/*bufferTraits=*/{});
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return Void();
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}
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int tokenId = tokenHandle->data[0];
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wp<BufferClient> originClientWp;
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{
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std::lock_guard<std::mutex> lock(mTokenMutex);
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auto iter = mTokenMap.find(tokenId);
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if (iter == mTokenMap.end()) {
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// Token Id not exist
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ALOGD("%s: token #%d not found.", __FUNCTION__, tokenId);
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_hidl_cb(/*status=*/BufferHubStatus::INVALID_TOKEN, /*bufferClient=*/nullptr,
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/*bufferTraits=*/{});
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return Void();
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}
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const std::vector<uint8_t>& tokenHMAC = iter->second.first;
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int numIntsForHMAC = (int)ceil(tokenHMAC.size() * sizeof(uint8_t) / (double)sizeof(int));
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if (tokenHandle->numInts - 1 != numIntsForHMAC) {
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// HMAC size not match
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ALOGD("%s: token #%d HMAC size not match. Expected: %d Actual: %d", __FUNCTION__,
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tokenId, numIntsForHMAC, tokenHandle->numInts - 1);
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_hidl_cb(/*status=*/BufferHubStatus::INVALID_TOKEN, /*bufferClient=*/nullptr,
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/*bufferTraits=*/{});
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return Void();
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}
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size_t hmacSize = tokenHMAC.size() * sizeof(uint8_t);
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if (memcmp(tokenHMAC.data(), &tokenHandle->data[1], hmacSize) != 0) {
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// HMAC not match
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ALOGD("%s: token #%d HMAC not match.", __FUNCTION__, tokenId);
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_hidl_cb(/*status=*/BufferHubStatus::INVALID_TOKEN, /*bufferClient=*/nullptr,
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/*bufferTraits=*/{});
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return Void();
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}
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originClientWp = iter->second.second;
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mTokenMap.erase(iter);
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}
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// Check if original client is dead
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sp<BufferClient> originClient = originClientWp.promote();
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if (!originClient) {
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// Should not happen since token should be removed if already gone
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ALOGE("%s: original client %p gone!", __FUNCTION__, originClientWp.unsafe_get());
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_hidl_cb(/*status=*/BufferHubStatus::BUFFER_FREED, /*bufferClient=*/nullptr,
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/*bufferTraits=*/{});
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return Void();
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}
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sp<BufferClient> client = new BufferClient(*originClient);
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uint32_t clientStateMask = client->getBufferNode()->addNewActiveClientsBitToMask();
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if (clientStateMask == 0U) {
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// Reach max client count
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ALOGE("%s: import failed, BufferNode#%u reached maximum clients.", __FUNCTION__,
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client->getBufferNode()->id());
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_hidl_cb(/*status=*/BufferHubStatus::MAX_CLIENT, /*bufferClient=*/nullptr,
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/*bufferTraits=*/{});
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return Void();
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}
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std::lock_guard<std::mutex> lock(mClientSetMutex);
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mClientSet.emplace(client);
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std::shared_ptr<BufferNode> node = client->getBufferNode();
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HardwareBufferDescription bufferDesc;
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memcpy(&bufferDesc, &node->bufferDesc(), sizeof(HardwareBufferDescription));
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// Allocate memory for bufferInfo of type hidl_handle on the stack. See
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// http://aosp/286282 for the usage of NATIVE_HANDLE_DECLARE_STORAGE.
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NATIVE_HANDLE_DECLARE_STORAGE(bufferInfoStorage, BufferHubDefs::kBufferInfoNumFds,
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BufferHubDefs::kBufferInfoNumInts);
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hidl_handle bufferInfo = buildBufferInfo(bufferInfoStorage, node->id(), clientStateMask,
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node->userMetadataSize(), node->metadata().ashmemFd(),
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node->eventFd().get());
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BufferTraits bufferTraits = {/*bufferDesc=*/bufferDesc,
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/*bufferHandle=*/hidl_handle(node->bufferHandle()),
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/*bufferInfo=*/std::move(bufferInfo)};
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_hidl_cb(/*status=*/BufferHubStatus::NO_ERROR, /*bufferClient=*/client,
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/*bufferTraits=*/std::move(bufferTraits));
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return Void();
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}
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Return<void> BufferHubService::debug(const hidl_handle& fd, const hidl_vec<hidl_string>& args) {
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if (fd.getNativeHandle() == nullptr || fd->numFds < 1) {
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ALOGE("%s: missing fd for writing.", __FUNCTION__);
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return Void();
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}
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FILE* out = fdopen(dup(fd->data[0]), "w");
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if (args.size() != 0) {
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fprintf(out,
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"Note: lshal bufferhub currently does not support args. Input arguments are "
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"ignored.\n");
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}
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std::ostringstream stream;
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// Get the number of clients of each buffer.
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// Map from bufferId to bufferNode_clientCount pair.
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std::map<int, std::pair<const std::shared_ptr<BufferNode>, uint32_t>> clientCount;
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{
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std::lock_guard<std::mutex> lock(mClientSetMutex);
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for (auto iter = mClientSet.begin(); iter != mClientSet.end(); ++iter) {
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sp<BufferClient> client = iter->promote();
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if (client != nullptr) {
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const std::shared_ptr<BufferNode> node = client->getBufferNode();
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auto mapIter = clientCount.find(node->id());
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if (mapIter != clientCount.end()) {
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++mapIter->second.second;
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} else {
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clientCount.emplace(node->id(),
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std::pair<std::shared_ptr<BufferNode>, uint32_t>(node, 1U));
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}
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}
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}
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}
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stream << "Active Buffers:\n";
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stream << std::right;
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stream << std::setw(6) << "Id";
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stream << " ";
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stream << std::setw(9) << "#Clients";
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stream << " ";
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stream << std::setw(14) << "Geometry";
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stream << " ";
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stream << std::setw(6) << "Format";
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stream << " ";
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stream << std::setw(10) << "Usage";
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stream << " ";
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stream << std::setw(10) << "State";
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stream << " ";
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stream << std::setw(8) << "Index";
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stream << std::endl;
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for (auto iter = clientCount.begin(); iter != clientCount.end(); ++iter) {
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const std::shared_ptr<BufferNode> node = std::move(iter->second.first);
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const uint32_t clientCount = iter->second.second;
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AHardwareBuffer_Desc desc = node->bufferDesc();
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MetadataHeader* metadataHeader =
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const_cast<BufferHubMetadata*>(&node->metadata())->metadataHeader();
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const uint32_t state = metadataHeader->bufferState.load(std::memory_order_acquire);
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const uint64_t index = metadataHeader->queueIndex;
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stream << std::right;
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stream << std::setw(6) << /*Id=*/node->id();
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stream << " ";
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stream << std::setw(9) << /*#Clients=*/clientCount;
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stream << " ";
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if (desc.format == HAL_PIXEL_FORMAT_BLOB) {
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std::string size = std::to_string(desc.width) + " B";
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stream << std::setw(14) << /*Geometry=*/size;
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} else {
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std::string dimensions = std::to_string(desc.width) + "x" +
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std::to_string(desc.height) + "x" + std::to_string(desc.layers);
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stream << std::setw(14) << /*Geometry=*/dimensions;
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}
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stream << " ";
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stream << std::setw(6) << /*Format=*/desc.format;
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stream << " ";
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stream << "0x" << std::hex << std::setfill('0');
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stream << std::setw(8) << /*Usage=*/desc.usage;
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stream << std::dec << std::setfill(' ');
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stream << " ";
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stream << "0x" << std::hex << std::setfill('0');
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stream << std::setw(8) << /*State=*/state;
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stream << std::dec << std::setfill(' ');
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stream << " ";
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stream << std::setw(8) << /*Index=*/index;
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stream << std::endl;
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}
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stream << std::endl;
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// Get the number of tokens of each buffer.
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// Map from bufferId to tokenCount
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std::map<int, uint32_t> tokenCount;
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{
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std::lock_guard<std::mutex> lock(mTokenMutex);
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for (auto iter = mTokenMap.begin(); iter != mTokenMap.end(); ++iter) {
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sp<BufferClient> client = iter->second.second.promote();
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if (client != nullptr) {
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const std::shared_ptr<BufferNode> node = client->getBufferNode();
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auto mapIter = tokenCount.find(node->id());
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if (mapIter != tokenCount.end()) {
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++mapIter->second;
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} else {
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tokenCount.emplace(node->id(), 1U);
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}
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}
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}
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}
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stream << "Unused Tokens:\n";
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stream << std::right;
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stream << std::setw(8) << "Buffer Id";
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stream << " ";
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stream << std::setw(7) << "#Tokens";
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stream << std::endl;
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for (auto iter = tokenCount.begin(); iter != tokenCount.end(); ++iter) {
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stream << std::right;
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stream << std::setw(8) << /*Buffer Id=*/iter->first;
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stream << " ";
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stream << std::setw(7) << /*#Tokens=*/iter->second;
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stream << std::endl;
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}
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fprintf(out, "%s", stream.str().c_str());
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fclose(out);
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return Void();
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}
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hidl_handle BufferHubService::registerToken(const wp<BufferClient>& client) {
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// Find next available token id
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std::lock_guard<std::mutex> lock(mTokenMutex);
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do {
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++mLastTokenId;
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} while (mTokenMap.find(mLastTokenId) != mTokenMap.end());
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std::array<uint8_t, EVP_MAX_MD_SIZE> hmac;
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uint32_t hmacSize = 0U;
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HMAC(/*evp_md=*/EVP_sha256(), /*key=*/&mKey, /*key_len=*/kKeyLen,
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/*data=*/(uint8_t*)&mLastTokenId, /*data_len=*/mTokenIdSize,
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/*out=*/hmac.data(), /*out_len=*/&hmacSize);
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int numIntsForHMAC = (int)ceil(hmacSize / (double)sizeof(int));
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native_handle_t* handle = native_handle_create(/*numFds=*/0, /*numInts=*/1 + numIntsForHMAC);
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handle->data[0] = mLastTokenId;
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// Set all the the bits of last int to 0 since it might not be fully overwritten
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handle->data[numIntsForHMAC] = 0;
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memcpy(&handle->data[1], hmac.data(), hmacSize);
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// returnToken owns the native_handle_t* thus doing lifecycle management
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hidl_handle returnToken;
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returnToken.setTo(handle, /*shoudOwn=*/true);
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std::vector<uint8_t> hmacVec;
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hmacVec.resize(hmacSize);
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memcpy(hmacVec.data(), hmac.data(), hmacSize);
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mTokenMap.emplace(mLastTokenId, std::pair(hmacVec, client));
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return returnToken;
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}
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void BufferHubService::onClientClosed(const BufferClient* client) {
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removeTokenByClient(client);
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std::lock_guard<std::mutex> lock(mClientSetMutex);
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auto iter = std::find(mClientSet.begin(), mClientSet.end(), client);
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if (iter != mClientSet.end()) {
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mClientSet.erase(iter);
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}
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}
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// Implementation of this function should be consistent with the definition of bufferInfo handle in
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// ui/BufferHubDefs.h.
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hidl_handle BufferHubService::buildBufferInfo(char* bufferInfoStorage, int bufferId,
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uint32_t clientBitMask, uint32_t userMetadataSize,
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int metadataFd, int eventFd) {
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native_handle_t* infoHandle =
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native_handle_init(bufferInfoStorage, BufferHubDefs::kBufferInfoNumFds,
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BufferHubDefs::kBufferInfoNumInts);
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infoHandle->data[0] = metadataFd;
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infoHandle->data[1] = eventFd;
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infoHandle->data[2] = bufferId;
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// Use memcpy to convert to int without missing digit.
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// TOOD(b/121345852): use bit_cast to unpack bufferInfo when C++20 becomes available.
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memcpy(&infoHandle->data[3], &clientBitMask, sizeof(clientBitMask));
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memcpy(&infoHandle->data[4], &userMetadataSize, sizeof(userMetadataSize));
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hidl_handle bufferInfo;
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bufferInfo.setTo(infoHandle, /*shouldOwn=*/false);
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return bufferInfo;
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}
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void BufferHubService::removeTokenByClient(const BufferClient* client) {
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std::lock_guard<std::mutex> lock(mTokenMutex);
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auto iter = mTokenMap.begin();
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while (iter != mTokenMap.end()) {
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if (iter->second.second == client) {
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auto oldIter = iter;
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++iter;
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mTokenMap.erase(oldIter);
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} else {
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++iter;
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}
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}
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}
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} // namespace implementation
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} // namespace V1_0
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} // namespace bufferhub
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} // namespace frameworks
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} // namespace android
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