src/dev/dma_virt_device.cc

/*
 * Copyright (c) 2021 Advanced Micro Devices, Inc.
 * All rights reserved.
 *
 * For use for simulation and test purposes only
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 * 1. Redistributions of source code must retain the above copyright notice,
 * this list of conditions and the following disclaimer.
 *
 * 2. Redistributions in binary form must reproduce the above copyright notice,
 * this list of conditions and the following disclaimer in the documentation
 * and/or other materials provided with the distribution.
 *
 * 3. Neither the name of the copyright holder nor the names of its
 * contributors may be used to endorse or promote products derived from this
 * software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 */

#include "dev/dma_virt_device.hh"

namespace gem5
{

DmaVirtDevice::DmaVirtDevice(const Params& p)
    : DmaDevice(p), pageBytes(p.system->getPageBytes())
{
}

void
DmaVirtDevice::dmaReadVirt(Addr host_addr, unsigned size,
                                 DmaCallback *cb, void *data, Tick delay)
{
    dmaVirt(&DmaDevice::dmaRead, host_addr, size, cb, data, delay);
}

void
DmaVirtDevice::dmaWriteVirt(Addr host_addr, unsigned size,
                                  DmaCallback *cb, void *data, Tick delay)
{
    dmaVirt(&DmaDevice::dmaWrite, host_addr, size, cb, data, delay);
}

void
DmaVirtDevice::dmaVirt(DmaFnPtr dmaFn, Addr addr, unsigned size,
                             DmaCallback *cb, void *data, Tick delay)
{
    if (size == 0) {
        if (cb)
            schedule(cb->getChunkEvent(), curTick() + delay);
        return;
    }

    // move the buffer data pointer with the chunks
    uint8_t *loc_data = (uint8_t*)data;

    for (ChunkGenerator gen(addr, size, pageBytes); !gen.done(); gen.next()) {
        Addr phys;

        // translate pages into their corresponding frames
        translateOrDie(gen.addr(), phys);

        Event *event = cb ? cb->getChunkEvent() : nullptr;

        (this->*dmaFn)(phys, gen.size(), event, loc_data, delay);

        loc_data += gen.size();
    }
}

} // namespace gem5