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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 <android-base/logging.h>
#include <android-base/mapped_file.h>
#include <cutils/ashmem.h>
#include <cutils/native_handle.h>
#include <sys/mman.h>
#include <limits>
#include <memory>
#include <utility>
#include "Result.h"
#include "SharedMemory.h"
#include "TypeUtils.h"
#include "Types.h"
namespace android::nn {
namespace {
GeneralResult<Mapping> mapAshmem(const Memory& memory) {
CHECK_LE(memory.size, std::numeric_limits<uint32_t>::max());
const auto size = memory.size;
int fd = memory.handle->handle()->data[0];
std::shared_ptr<base::MappedFile> mapping =
base::MappedFile::FromFd(fd, /*offset=*/0, size, PROT_READ | PROT_WRITE);
if (mapping == nullptr) {
return NN_ERROR(ErrorStatus::GENERAL_FAILURE) << "Can't mmap the file descriptor.";
}
void* data = mapping->data();
return Mapping{.pointer = data, .size = size, .context = std::move(mapping)};
}
struct MmapFdMappingContext {
int prot;
std::any context;
};
GeneralResult<Mapping> mapMemFd(const Memory& memory) {
const size_t size = memory.size;
const native_handle_t* handle = memory.handle->handle();
const int fd = handle->data[0];
const int prot = handle->data[1];
const size_t offset = getOffsetFromInts(handle->data[2], handle->data[3]);
std::shared_ptr<base::MappedFile> mapping = base::MappedFile::FromFd(fd, offset, size, prot);
if (mapping == nullptr) {
return NN_ERROR(ErrorStatus::GENERAL_FAILURE) << "Can't mmap the file descriptor.";
}
void* data = mapping->data();
auto context = MmapFdMappingContext{.prot = prot, .context = std::move(mapping)};
return Mapping{.pointer = data, .size = size, .context = std::move(context)};
}
} // namespace
GeneralResult<Memory> createSharedMemory(size_t size) {
int fd = ashmem_create_region("NnapiAshmem", size);
if (fd < 0) {
return NN_ERROR(ErrorStatus::GENERAL_FAILURE)
<< "ashmem_create_region(" << size << ") fails with " << fd;
}
native_handle_t* handle = native_handle_create(1, 0);
if (handle == nullptr) {
// TODO(b/120417090): is ANEURALNETWORKS_UNEXPECTED_NULL the correct error to return here?
return NN_ERROR(ErrorStatus::GENERAL_FAILURE) << "Failed to create native_handle";
}
handle->data[0] = fd;
// Create a NativeHandle which owns the native handle and fd so that we don't have to manually
// clean either the native handle or the fd.
auto nativeHandle = ::android::NativeHandle::create(handle, /*ownsHandle=*/true);
return Memory{.handle = std::move(nativeHandle), .size = size, .name = "ashmem"};
}
GeneralResult<Memory> createSharedMemoryFromFd(size_t size, int prot, int fd, size_t offset) {
if (size == 0 || fd < 0) {
return NN_ERROR(ErrorStatus::INVALID_ARGUMENT) << "Invalid size or fd";
}
// Duplicate the file descriptor so the resultant Memory owns its own version.
int dupfd = dup(fd);
if (dupfd == -1) {
// TODO(b/120417090): is ANEURALNETWORKS_UNEXPECTED_NULL the correct error to return here?
return NN_ERROR(ErrorStatus::INVALID_ARGUMENT) << "Failed to dup the fd";
}
// Create a temporary native handle to own the dupfd.
native_handle_t* nativeHandle = native_handle_create(1, 3);
if (nativeHandle == nullptr) {
close(dupfd);
// TODO(b/120417090): is ANEURALNETWORKS_UNEXPECTED_NULL the correct error to return here?
return NN_ERROR(ErrorStatus::GENERAL_FAILURE) << "Failed to create native_handle";
}
const auto [lowOffsetBits, highOffsetBits] = getIntsFromOffset(offset);
nativeHandle->data[0] = dupfd;
nativeHandle->data[1] = prot;
nativeHandle->data[2] = lowOffsetBits;
nativeHandle->data[3] = highOffsetBits;
// Create a NativeHandle which owns the native handle and fd so that we don't have to manually
// clean either the native handle or the fd.
auto ownedHandle = ::android::NativeHandle::create(nativeHandle, /*ownsHandle=*/true);
return Memory{.handle = std::move(ownedHandle), .size = size, .name = "mmap_fd"};
}
GeneralResult<Memory> createSharedMemoryFromHidlMemory(const hardware::hidl_memory& /*memory*/) {
return NN_ERROR(ErrorStatus::INVALID_ARGUMENT) << "hidl_memory not supported on host";
}
GeneralResult<Memory> createSharedMemoryFromAHWB(const AHardwareBuffer& /*ahwb*/) {
return NN_ERROR(ErrorStatus::INVALID_ARGUMENT)
<< "AHardwareBuffer memory not supported on host";
}
GeneralResult<Mapping> map(const Memory& memory) {
if (memory.name == "ashmem") {
return mapAshmem(memory);
}
if (memory.name == "mmap_fd") {
return mapMemFd(memory);
}
return NN_ERROR(ErrorStatus::INVALID_ARGUMENT) << "Cannot map unknown memory " << memory.name;
}
bool flush(const Mapping& mapping) {
if (const auto* mmapFdMapping = std::any_cast<MmapFdMappingContext>(&mapping.context)) {
if (!std::holds_alternative<void*>(mapping.pointer)) {
return true;
}
void* data = std::get<void*>(mapping.pointer);
const int prot = mmapFdMapping->prot;
if (prot & PROT_WRITE) {
const size_t size = mapping.size;
return msync(data, size, MS_SYNC) == 0;
}
}
// No-op for other types of memory.
return true;
}
} // namespace android::nn
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