drivers/gpu/msd-intel-gen/src/gtt_shim.cc

// Copyright 2017 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.

#include "gtt.h"
#include "msd_intel_pci_device.h"

class GttShim : public Gtt {
public:
    GttShim(Owner* owner) : Gtt(owner), owner_(owner) {}

    uint64_t Size() const override { return pci_device()->GetGtt()->Size(); }

    // Init only on core gtt
    bool Init(uint64_t gtt_size) override
    {
        DASSERT(false);
        return false;
    }

private:
    // AddressSpace overrides
    bool AllocLocked(size_t size, uint8_t align_pow2, uint64_t* addr_out) override
    {
        return pci_device()->GetGtt()->Alloc(size, align_pow2, addr_out);
    }
    bool FreeLocked(uint64_t addr) override { return pci_device()->GetGtt()->Free(addr); }

    bool ClearLocked(uint64_t addr, uint64_t page_count) override
    {
        return pci_device()->GetGtt()->Clear(addr, page_count);
    }

    bool InsertLocked(uint64_t addr, magma::PlatformBusMapper::BusMapping* bus_mapping) override
    {
        DASSERT(false);
        return false;
    }

    bool GlobalGttInsertLocked(uint64_t addr, magma::PlatformBuffer* buffer, uint64_t page_offset,
                               uint64_t page_count) override
    {
        return pci_device()->GetGtt()->GlobalGttInsert(addr, buffer, page_offset, page_count);
    }

    MsdIntelPciDevice* pci_device() const
    {
        return static_cast<MsdIntelPciDevice*>(owner_->platform_device());
    }

    Owner* owner_;
};

std::unique_ptr<Gtt> Gtt::CreateShim(Owner* owner) { return std::make_unique<GttShim>(owner); }