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/*
* Copyright (c) 2011-2018, 2020 The Linux Foundation. All rights reserved.
* Not a Contribution
*
* Copyright (C) 2008 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.
*/
#ifndef __GR_BUF_MGR_H__
#define __GR_BUF_MGR_H__
#include <pthread.h>
#include <mutex>
#include <unordered_map>
#include <unordered_set>
#include <utility>
#include "gr_allocator.h"
#include "gr_utils.h"
#include "gr_buf_descriptor.h"
#include "gralloc_priv.h"
namespace gralloc {
using android::hardware::graphics::mapper::V3_0::Error;
class BufferManager {
public:
~BufferManager();
Error AllocateBuffer(const BufferDescriptor &descriptor, buffer_handle_t *handle,
unsigned int bufferSize = 0, bool testAlloc = false);
Error RetainBuffer(private_handle_t const *hnd);
Error ReleaseBuffer(private_handle_t const *hnd);
Error LockBuffer(const private_handle_t *hnd, uint64_t usage);
Error UnlockBuffer(const private_handle_t *hnd);
Error Dump(std::ostringstream *os);
Error ValidateBufferSize(private_handle_t const *hnd, BufferInfo info);
Error IsBufferImported(const private_handle_t *hnd);
static BufferManager *GetInstance();
private:
BufferManager();
Error MapBuffer(private_handle_t const *hnd);
// Imports the ion fds into the current process. Returns an error for invalid handles
Error ImportHandleLocked(private_handle_t *hnd);
// Creates a Buffer from the valid private handle and adds it to the map
void RegisterHandleLocked(const private_handle_t *hnd, int ion_handle, int ion_handle_meta);
// Wrapper structure over private handle
// Values associated with the private handle
// that do not need to go over IPC can be placed here
// This structure is also not expected to be ABI stable
// unlike private_handle_t
struct Buffer {
const private_handle_t *handle = nullptr;
int ref_count = 1;
// Hold the main and metadata ion handles
// Freed from the allocator process
// and unused in the mapping process
int ion_handle_main = -1;
int ion_handle_meta = -1;
Buffer() = delete;
explicit Buffer(const private_handle_t *h, int ih_main = -1, int ih_meta = -1)
: handle(h), ion_handle_main(ih_main), ion_handle_meta(ih_meta) {}
void IncRef() { ++ref_count; }
bool DecRef() { return --ref_count == 0; }
};
Error FreeBuffer(std::shared_ptr<Buffer> buf);
// Get the wrapper Buffer object from the handle, returns nullptr if handle is not found
std::shared_ptr<Buffer> GetBufferFromHandleLocked(const private_handle_t *hnd);
Allocator *allocator_ = NULL;
std::mutex buffer_lock_;
std::unordered_map<const private_handle_t *, std::shared_ptr<Buffer>> handles_map_ = {};
std::atomic<uint64_t> next_id_;
};
} // namespace gralloc
#endif // __GR_BUF_MGR_H__
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