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/*
* Copyright (C) 2020 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include "ResilientBuffer.h"
#include <android-base/logging.h>
#include <android-base/thread_annotations.h>
#include <nnapi/IBuffer.h>
#include <nnapi/Result.h>
#include <nnapi/TypeUtils.h>
#include <nnapi/Types.h>
#include <functional>
#include <memory>
#include <mutex>
#include <utility>
#include <vector>
namespace android::hardware::neuralnetworks::utils {
namespace {
template <typename FnType>
auto protect(const ResilientBuffer& resilientBuffer, const FnType& fn)
-> decltype(fn(*resilientBuffer.getBuffer())) {
auto buffer = resilientBuffer.getBuffer();
auto result = fn(*buffer);
// Immediately return if device is not dead.
if (result.has_value() || result.error().code != nn::ErrorStatus::DEAD_OBJECT) {
return result;
}
// Attempt recovery and return if it fails.
auto maybeBuffer = resilientBuffer.recover(buffer.get());
if (!maybeBuffer.has_value()) {
const auto& [resultErrorMessage, resultErrorCode] = result.error();
const auto& [recoveryErrorMessage, recoveryErrorCode] = maybeBuffer.error();
return nn::error(resultErrorCode)
<< resultErrorMessage << ", and failed to recover dead buffer with error "
<< recoveryErrorCode << ": " << recoveryErrorMessage;
}
buffer = std::move(maybeBuffer).value();
return fn(*buffer);
}
} // namespace
nn::GeneralResult<std::shared_ptr<const ResilientBuffer>> ResilientBuffer::create(
Factory makeBuffer) {
if (makeBuffer == nullptr) {
return NN_ERROR(nn::ErrorStatus::INVALID_ARGUMENT)
<< "utils::ResilientBuffer::create must have non-empty makeBuffer";
}
auto buffer = NN_TRY(makeBuffer());
CHECK(buffer != nullptr);
return std::make_shared<const ResilientBuffer>(PrivateConstructorTag{}, std::move(makeBuffer),
std::move(buffer));
}
ResilientBuffer::ResilientBuffer(PrivateConstructorTag /*tag*/, Factory makeBuffer,
nn::SharedBuffer buffer)
: kMakeBuffer(std::move(makeBuffer)), mBuffer(std::move(buffer)) {
CHECK(kMakeBuffer != nullptr);
CHECK(mBuffer != nullptr);
}
nn::SharedBuffer ResilientBuffer::getBuffer() const {
std::lock_guard guard(mMutex);
return mBuffer;
}
nn::GeneralResult<nn::SharedBuffer> ResilientBuffer::recover(
const nn::IBuffer* failingBuffer) const {
std::lock_guard guard(mMutex);
// Another caller updated the failing prepared model.
if (mBuffer.get() != failingBuffer) {
return mBuffer;
}
mBuffer = NN_TRY(kMakeBuffer());
return mBuffer;
}
nn::Request::MemoryDomainToken ResilientBuffer::getToken() const {
return getBuffer()->getToken();
}
nn::GeneralResult<void> ResilientBuffer::copyTo(const nn::SharedMemory& dst) const {
const auto fn = [&dst](const nn::IBuffer& buffer) { return buffer.copyTo(dst); };
return protect(*this, fn);
}
nn::GeneralResult<void> ResilientBuffer::copyFrom(const nn::SharedMemory& src,
const nn::Dimensions& dimensions) const {
const auto fn = [&src, &dimensions](const nn::IBuffer& buffer) {
return buffer.copyFrom(src, dimensions);
};
return protect(*this, fn);
}
} // namespace android::hardware::neuralnetworks::utils
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