dma.cpp

/*
 * Copyright 2021 Max Planck Institute for Software Systems, and
 * National University of Singapore
 *
 * Permission is hereby granted, free of charge, to any person obtaining
 * a copy of this software and associated documentation files (the
 * "Software"), to deal in the Software without restriction, including
 * without limitation the rights to use, copy, modify, merge, publish,
 * distribute, sublicense, and/or sell copies of the Software, and to
 * permit persons to whom the Software is furnished to do so, subject to
 * the following conditions:
 *
 * The above copyright notice and this permission notice shall be
 * included in all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
 * IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
 * CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
 * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
 * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 */

#include <iostream>

#include "sims/nic/corundum/debug.h"
#include "sims/nic/corundum/corundum.h"
#include "sims/nic/corundum/dma.h"
#include "sims/nic/corundum/mem.h"


void DMAReader::step()
{
    p.dma_ready = 1;
    if (p.dma_valid) {
        DMAOp *op = new DMAOp;
        op->engine = this;
        op->dma_addr = p.dma_addr;
        op->ram_sel = p.dma_ram_sel;
        op->ram_addr = p.dma_ram_addr;
        op->len = p.dma_len;
        op->tag = p.dma_tag;
        op->write = false;
        pending.insert(op);

#ifdef DMA_DEBUG
        std::cout << main_time << " dma[" << label << "] op " << std::hex <<
            op->dma_addr << " -> " << op->ram_sel << ":" << op->ram_addr <<
            "   len=" << op->len << "   tag=" << (int) op->tag << std::endl;
#endif

        coord.dma_register(op, true);
    }

    p.dma_status_valid = 0;
    if (!completed.empty()) {
        DMAOp *op = completed.front();
        completed.pop_front();

        // std::cout << "dma[" << label << "] status complete " << op->dma_addr
        //      << std::endl;

        p.dma_status_valid = 1;
        p.dma_status_tag = op->tag;
        pending.erase(op);
        delete op;
    }
}

void DMAReader::pci_op_complete(DMAOp *op)
{
    mw.op_issue(op);
}

void DMAReader::mem_op_complete(DMAOp *op)
{
    completed.push_back(op);
    // std::cout << "dma[" << label << "] mem complete " << op->dma_addr <<
    //      std::endl;
}



void DMAWriter::step()
{
    p.dma_ready = 1;
    if (p.dma_valid) {
        DMAOp *op = new DMAOp;
        op->engine = this;
        op->dma_addr = p.dma_addr;
        op->ram_sel = p.dma_ram_sel;
        op->ram_addr = p.dma_ram_addr;
        op->len = p.dma_len;
        op->tag = p.dma_tag;
        op->write = true;
        pending.insert(op);

#ifdef DMA_DEBUG
        std::cout << main_time << " dma write [" << label << "] op " <<
            std::hex << op->dma_addr << " -> " << op->ram_sel << ":" <<
            op->ram_addr << "   len=" << op->len << "   tag=" << (int) op->tag
            << std::endl;
#endif

        coord.dma_register(op, false);
        mr.op_issue(op);
    }

    p.dma_status_valid = 0;
    if (!completed.empty()) {
        DMAOp *op = completed.front();
        completed.pop_front();

#ifdef DMA_DEBUG
        std::cout << main_time << " dma write [" << label <<
            "] status complete " << op->dma_addr << std::endl;
#endif

        p.dma_status_valid = 1;
        p.dma_status_tag = op->tag;
        pending.erase(op);
        // coord.msi_enqueue(0);
        delete op;
    }
}

void DMAWriter::pci_op_complete(DMAOp *op)
{
#ifdef DMA_DEBUG
    std::cout << main_time << " dma write [" << label << "] pci complete " <<
        op->dma_addr << std::endl;
#endif
    completed.push_back(op);
}

void DMAWriter::mem_op_complete(DMAOp *op)
{
#ifdef DMA_DEBUG
    std::cout << main_time << " dma write [" << label << "] mem complete " <<
        op->dma_addr << ": ";
    for (size_t i = 0; i < op->len; i++)
        std::cout << (unsigned) op->data[i] << " ";
    std::cout << std::endl;
#endif
    coord.dma_mark_ready(op);
}