drivers/gpu/msd-vsl-gc/src/address_space_base.h

// Copyright 2018 The Fuchsia Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#ifndef ADDRESS_SPACE_BASE_H_
#define ADDRESS_SPACE_BASE_H_

#include "gpu_mapping.h"
#include <map>
#include <unordered_map>

class AddressSpaceBase {
public:
    using gpu_addr_t = uint32_t;
    static_assert(sizeof(GpuMapping::gpu_addr_t) == sizeof(gpu_addr_t), "size mismatch");

    virtual ~AddressSpaceBase() {}

    virtual bool Insert(gpu_addr_t addr, magma::PlatformBusMapper::BusMapping* bus_mapping,
                        uint64_t page_count) = 0;
    virtual bool Clear(gpu_addr_t addr, uint64_t page_count) = 0;

    bool AddMapping(std::unique_ptr<GpuMapping> gpu_mapping);
    bool RemoveMapping(magma::PlatformBuffer* buffer, gpu_addr_t gpu_addr);

    void ReleaseBuffer(magma::PlatformBuffer* buffer, uint32_t* released_count_out);

private:
    using map_container_t = std::map<gpu_addr_t, std::shared_ptr<GpuMapping>>;
    // Container of gpu mappings by address
    map_container_t mappings_;
    // Container of references to entries in mappings_ by buffer;
    // useful for cleaning up mappings when connections go away, and when
    // buffers are released.
    std::unordered_multimap<magma::PlatformBuffer*, map_container_t::iterator> mappings_by_buffer_;

    friend class TestAddressSpaceBase;
};

#endif // ADDRESS_SPACE_BASE_H_