/*
 * Copyright (c) 2019 ARM Limited
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 *
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 * not be construed as granting a license to any other intellectual
 * property including but not limited to intellectual property relating
 * to a hardware implementation of the functionality of the software
 * licensed hereunder.  You may use the software subject to the license
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 * modification, are permitted provided that the following conditions are
 * met: redistributions of source code must retain the above copyright
 * notice, this list of conditions and the following disclaimer;
 * redistributions in binary form must reproduce the above copyright
 * notice, this list of conditions and the following disclaimer in the
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 * neither the name of the copyright holders nor the names of its
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 * this software without specific prior written permission.
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#include "dev/arm/smmu_v3_deviceifc.hh"

#include "base/trace.hh"
#include "debug/SMMUv3.hh"
#include "dev/arm/smmu_v3.hh"
#include "dev/arm/smmu_v3_transl.hh"

namespace gem5
{

SMMUv3DeviceInterface::SMMUv3DeviceInterface(
    const SMMUv3DeviceInterfaceParams &p) :
    ClockedObject(p),
    smmu(nullptr),
    microTLB(new SMMUTLB(p.utlb_entries,
                         p.utlb_assoc,
                         p.utlb_policy,
                         this, "utlb")),
    mainTLB(new SMMUTLB(p.tlb_entries,
                        p.tlb_assoc,
                        p.tlb_policy,
                        this, "maintlb")),
    microTLBEnable(p.utlb_enable),
    mainTLBEnable(p.tlb_enable),
    devicePortSem(1),
    microTLBSem(p.utlb_slots),
    mainTLBSem(p.tlb_slots),
    microTLBLat(p.utlb_lat),
    mainTLBLat(p.tlb_lat),
    devicePort(new SMMUDevicePort(csprintf("%s.device_port",
                                            name()), *this)),
    atsDevicePort(name() + ".atsDevicePort", *this),
    atsMemPort(name() + ".atsMemPort", *this),
    portWidth(p.port_width),
    wrBufSlotsRemaining(p.wrbuf_slots),
    xlateSlotsRemaining(p.xlate_slots),
    pendingMemAccesses(0),
    prefetchEnable(p.prefetch_enable),
    prefetchReserveLastWay(
        p.prefetch_reserve_last_way),
    deviceNeedsRetry(false),
    atsDeviceNeedsRetry(false),
    sendDeviceRetryEvent(*this),
    atsSendDeviceRetryEvent(this)
{}

void
SMMUv3DeviceInterface::sendRange()
{
    if (devicePort->isConnected()) {
        inform("Device port is connected to %s\n", devicePort->getPeer());

        devicePort->sendRangeChange();
    } else {
        fatal("Device port is not connected.\n");
    }
}

Port&
SMMUv3DeviceInterface::getPort(const std::string &name, PortID id)
{
    if (name == "ats_mem_side_port") {
        return atsMemPort;
    } else if (name == "device_port") {
        return *devicePort;
    } else if (name == "ats_dev_side_port") {
        return atsDevicePort;
    } else {
        return ClockedObject::getPort(name, id);
    }
}

void
SMMUv3DeviceInterface::schedTimingResp(PacketPtr pkt)
{
    devicePort->schedTimingResp(pkt, nextCycle());
}

void
SMMUv3DeviceInterface::schedAtsTimingResp(PacketPtr pkt)
{
    atsDevicePort.schedTimingResp(pkt, nextCycle());

    if (atsDeviceNeedsRetry) {
        atsDeviceNeedsRetry = false;
        schedule(atsSendDeviceRetryEvent, nextCycle());
    }
}

Tick
SMMUv3DeviceInterface::recvAtomic(PacketPtr pkt)
{
    DPRINTF(SMMUv3, "[a] req from %s addr=%#x size=%#x\n",
            devicePort->getPeer(), pkt->getAddr(), pkt->getSize());

    std::string proc_name = csprintf("%s.port", name());
    SMMUTranslationProcess proc(proc_name, *smmu, *this);
    proc.beginTransaction(SMMUTranslRequest::fromPacket(pkt));

    SMMUAction a = smmu->runProcessAtomic(&proc, pkt);
    assert(a.type == ACTION_SEND_RESP);

    return a.delay;
}

bool
SMMUv3DeviceInterface::recvTimingReq(PacketPtr pkt)
{
    DPRINTF(SMMUv3, "[t] req from %s addr=%#x size=%#x\n",
            devicePort->getPeer(), pkt->getAddr(), pkt->getSize());

    // @todo: We need to pay for this and not just zero it out
    pkt->headerDelay = pkt->payloadDelay = 0;

    unsigned nbeats =
        (pkt->getSize() + (portWidth-1)) / portWidth;

    if (xlateSlotsRemaining==0 ||
        (pkt->isWrite() && wrBufSlotsRemaining < nbeats))
    {
        deviceNeedsRetry = true;
        return false;
    }

    if (pkt->isWrite())
        wrBufSlotsRemaining -= nbeats;

    std::string proc_name = csprintf("%s.port", name());
    SMMUTranslationProcess *proc =
        new SMMUTranslationProcess(proc_name, *smmu, *this);
    proc->beginTransaction(SMMUTranslRequest::fromPacket(pkt));

    smmu->runProcessTiming(proc, pkt);

    return true;
}

Tick
SMMUv3DeviceInterface::atsRecvAtomic(PacketPtr pkt)
{
    DPRINTF(SMMUv3, "[a] ATS responder req  addr=%#x size=%#x\n",
            pkt->getAddr(), pkt->getSize());

    std::string proc_name = csprintf("%s.atsport", name());
    const bool ats_request = true;
    SMMUTranslationProcess proc(
        proc_name, *smmu, *this);
    proc.beginTransaction(SMMUTranslRequest::fromPacket(pkt, ats_request));

    SMMUAction a = smmu->runProcessAtomic(&proc, pkt);
    assert(a.type == ACTION_SEND_RESP_ATS);

    return a.delay;
}

bool
SMMUv3DeviceInterface::atsRecvTimingReq(PacketPtr pkt)
{
    DPRINTF(SMMUv3, "[t] ATS responder  req  addr=%#x size=%#x\n",
            pkt->getAddr(), pkt->getSize());

    // @todo: We need to pay for this and not just zero it out
    pkt->headerDelay = pkt->payloadDelay = 0;

    if (xlateSlotsRemaining == 0) {
        deviceNeedsRetry = true;
        return false;
    }

    std::string proc_name = csprintf("%s.atsport", name());
    const bool ats_request = true;
    SMMUTranslationProcess *proc =
        new SMMUTranslationProcess(proc_name, *smmu, *this);
    proc->beginTransaction(SMMUTranslRequest::fromPacket(pkt, ats_request));

    smmu->runProcessTiming(proc, pkt);

    return true;
}

bool
SMMUv3DeviceInterface::atsRecvTimingResp(PacketPtr pkt)
{
    DPRINTF(SMMUv3, "[t] ATS requestor resp addr=%#x size=%#x\n",
            pkt->getAddr(), pkt->getSize());

    // @todo: We need to pay for this and not just zero it out
    pkt->headerDelay = pkt->payloadDelay = 0;

    SMMUProcess *proc =
        safe_cast<SMMUProcess *>(pkt->popSenderState());

    smmu->runProcessTiming(proc, pkt);

    return true;
}

void
SMMUv3DeviceInterface::sendDeviceRetry()
{
    devicePort->sendRetryReq();
}

void
SMMUv3DeviceInterface::atsSendDeviceRetry()
{
    DPRINTF(SMMUv3, "ATS retry\n");
    atsDevicePort.sendRetryReq();
}

void
SMMUv3DeviceInterface::scheduleDeviceRetry()
{
    if (deviceNeedsRetry && !sendDeviceRetryEvent.scheduled()) {
        DPRINTF(SMMUv3, "sched responder retry\n");
        deviceNeedsRetry = false;
        schedule(sendDeviceRetryEvent, nextCycle());
    }
}

DrainState
SMMUv3DeviceInterface::drain()
{
    // Wait until all SMMU translations are completed
    if (xlateSlotsRemaining < params().xlate_slots) {
        return DrainState::Draining;
    }
    return DrainState::Drained;
}

} // namespace gem5