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/*
* Copyright (c) 2018, 2020 ARM Limited
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*
* The license below extends only to copyright in the software and shall
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#include "mem/mem_delay.hh"
#include "params/MemDelay.hh"
#include "params/SimpleMemDelay.hh"
namespace gem5
{
MemDelay::MemDelay(const MemDelayParams &p)
: ClockedObject(p),
requestPort(name() + "-mem_side_port", *this),
responsePort(name() + "-cpu_side_port", *this),
reqQueue(*this, requestPort),
respQueue(*this, responsePort),
snoopRespQueue(*this, requestPort)
{
}
void
MemDelay::init()
{
if (!responsePort.isConnected() || !requestPort.isConnected())
fatal("Memory delay is not connected on both sides.\n");
}
Port &
MemDelay::getPort(const std::string &if_name, PortID idx)
{
if (if_name == "mem_side_port") {
return requestPort;
} else if (if_name == "cpu_side_port") {
return responsePort;
} else {
return ClockedObject::getPort(if_name, idx);
}
}
bool
MemDelay::trySatisfyFunctional(PacketPtr pkt)
{
return responsePort.trySatisfyFunctional(pkt) ||
requestPort.trySatisfyFunctional(pkt);
}
MemDelay::RequestPort::RequestPort(const std::string &_name, MemDelay &_parent)
: QueuedRequestPort(_name, _parent.reqQueue, _parent.snoopRespQueue),
parent(_parent)
{
}
bool
MemDelay::RequestPort::recvTimingResp(PacketPtr pkt)
{
// technically the packet only reaches us after the header delay,
// and typically we also need to deserialise any payload
const Tick receive_delay = pkt->headerDelay + pkt->payloadDelay;
pkt->headerDelay = pkt->payloadDelay = 0;
const Tick when = curTick() + parent.delayResp(pkt) + receive_delay;
parent.responsePort.schedTimingResp(pkt, when);
return true;
}
void
MemDelay::RequestPort::recvFunctionalSnoop(PacketPtr pkt)
{
if (parent.trySatisfyFunctional(pkt)) {
pkt->makeResponse();
} else {
parent.responsePort.sendFunctionalSnoop(pkt);
}
}
Tick
MemDelay::RequestPort::recvAtomicSnoop(PacketPtr pkt)
{
const Tick delay = parent.delaySnoopResp(pkt);
return delay + parent.responsePort.sendAtomicSnoop(pkt);
}
void
MemDelay::RequestPort::recvTimingSnoopReq(PacketPtr pkt)
{
parent.responsePort.sendTimingSnoopReq(pkt);
}
MemDelay::ResponsePort::
ResponsePort(const std::string &_name, MemDelay &_parent)
: QueuedResponsePort(_name, _parent.respQueue),
parent(_parent)
{
}
Tick
MemDelay::ResponsePort::recvAtomic(PacketPtr pkt)
{
const Tick delay = parent.delayReq(pkt) + parent.delayResp(pkt);
return delay + parent.requestPort.sendAtomic(pkt);
}
bool
MemDelay::ResponsePort::recvTimingReq(PacketPtr pkt)
{
// technically the packet only reaches us after the header
// delay, and typically we also need to deserialise any
// payload
Tick receive_delay = pkt->headerDelay + pkt->payloadDelay;
pkt->headerDelay = pkt->payloadDelay = 0;
const Tick when = curTick() + parent.delayReq(pkt) + receive_delay;
parent.requestPort.schedTimingReq(pkt, when);
return true;
}
void
MemDelay::ResponsePort::recvFunctional(PacketPtr pkt)
{
if (parent.trySatisfyFunctional(pkt)) {
pkt->makeResponse();
} else {
parent.requestPort.sendFunctional(pkt);
}
}
bool
MemDelay::ResponsePort::recvTimingSnoopResp(PacketPtr pkt)
{
const Tick when = curTick() + parent.delaySnoopResp(pkt);
parent.requestPort.schedTimingSnoopResp(pkt, when);
return true;
}
SimpleMemDelay::SimpleMemDelay(const SimpleMemDelayParams &p)
: MemDelay(p),
readReqDelay(p.read_req),
readRespDelay(p.read_resp),
writeReqDelay(p.write_req),
writeRespDelay(p.write_resp)
{
}
Tick
SimpleMemDelay::delayReq(PacketPtr pkt)
{
if (pkt->isRead()) {
return readReqDelay;
} else if (pkt->isWrite()) {
return writeReqDelay;
} else {
return 0;
}
}
Tick
SimpleMemDelay::delayResp(PacketPtr pkt)
{
if (pkt->isRead()) {
return readRespDelay;
} else if (pkt->isWrite()) {
return writeRespDelay;
} else {
return 0;
}
}
} // namespace gem5