* Authors: Ali Saidi
*/
+#include "debug/Bus.hh"
#include "mem/tport.hh"
-void
+using namespace std;
+
+SimpleTimingPort::SimpleTimingPort(string pname, MemObject *_owner)
+ : Port(pname, _owner), sendEvent(0), drainEvent(NULL),
+ waitingOnRetry(false)
+{
+ sendEvent = new EventWrapper<SimpleTimingPort,
+ &SimpleTimingPort::processSendEvent>(this);
+}
+
+SimpleTimingPort::~SimpleTimingPort()
+{
+ delete sendEvent;
+}
+
+bool
SimpleTimingPort::checkFunctional(PacketPtr pkt)
{
DeferredPacketIterator i = transmitList.begin();
PacketPtr target = i->pkt;
// If the target contains data, and it overlaps the
// probed request, need to update data
- if (target->intersect(pkt)) {
- if (!fixPacket(pkt, target)) {
- // fixPacket returns true for continue, false for done
- return;
- }
+ if (pkt->checkFunctional(target)) {
+ return true;
}
}
+
+ return false;
}
void
SimpleTimingPort::recvFunctional(PacketPtr pkt)
{
- checkFunctional(pkt);
-
- // Just do an atomic access and throw away the returned latency
- if (pkt->result != Packet::Success)
+ if (!checkFunctional(pkt)) {
+ // Just do an atomic access and throw away the returned latency
recvAtomic(pkt);
+ }
}
bool
// code to hanldle nacks here, but I'm pretty sure it didn't work
// correctly with the drain code, so that would need to be fixed
// if we ever added it back.
- assert(pkt->result != Packet::Nacked);
+
+ if (pkt->memInhibitAsserted()) {
+ // snooper will supply based on copy of packet
+ // still target's responsibility to delete packet
+ delete pkt;
+ return true;
+ }
+
+ bool needsResponse = pkt->needsResponse();
Tick latency = recvAtomic(pkt);
// turn packet around to go back to requester if response expected
- if (pkt->needsResponse()) {
- pkt->makeTimingResponse();
- schedSendTiming(pkt, curTick + latency);
- }
- else if (pkt->cmd != MemCmd::UpgradeReq) {
- delete pkt->req;
+ if (needsResponse) {
+ // recvAtomic() should already have turned packet into
+ // atomic response
+ assert(pkt->isResponse());
+ schedSendTiming(pkt, curTick() + latency);
+ } else {
delete pkt;
}
+
return true;
}
void
SimpleTimingPort::schedSendTiming(PacketPtr pkt, Tick when)
{
- assert(when > curTick);
+ assert(when > curTick());
+ assert(when < curTick() + SimClock::Int::ms);
// Nothing is on the list: add it and schedule an event
- if (transmitList.empty()) {
- assert(!sendEvent->scheduled());
- sendEvent->schedule(when);
- transmitList.push_back(DeferredPacket(when, pkt));
+ if (transmitList.empty() || when < transmitList.front().tick) {
+ transmitList.push_front(DeferredPacket(when, pkt));
+ schedSendEvent(when);
return;
}
- // something is on the list and this belongs at the end
+ // list is non-empty & this belongs at the end
if (when >= transmitList.back().tick) {
transmitList.push_back(DeferredPacket(when, pkt));
return;
}
- // Something is on the list and this belongs somewhere else
+
+ // this belongs in the middle somewhere
DeferredPacketIterator i = transmitList.begin();
+ i++; // already checked for insertion at front
DeferredPacketIterator end = transmitList.end();
for (; i != end; ++i) {
if (when < i->tick) {
- if (i == transmitList.begin()) {
- //Inserting at begining, reschedule
- sendEvent->reschedule(when);
- }
transmitList.insert(i, DeferredPacket(when, pkt));
return;
}
SimpleTimingPort::sendDeferredPacket()
{
assert(deferredPacketReady());
- bool success = sendTiming(transmitList.front().pkt);
+ // take packet off list here; if recvTiming() on the other side
+ // calls sendTiming() back on us (like SimpleTimingCpu does), then
+ // we get confused by having a non-active packet on transmitList
+ DeferredPacket dp = transmitList.front();
+ transmitList.pop_front();
+ bool success = sendTiming(dp.pkt);
if (success) {
- //send successful, remove packet
- transmitList.pop_front();
- if (!transmitList.empty()) {
+ if (!transmitList.empty() && !sendEvent->scheduled()) {
Tick time = transmitList.front().tick;
- sendEvent->schedule(time <= curTick ? curTick+1 : time);
+ schedule(sendEvent, time <= curTick() ? curTick()+1 : time);
}
- if (transmitList.empty() && drainEvent) {
+ if (transmitList.empty() && drainEvent && !sendEvent->scheduled()) {
drainEvent->process();
drainEvent = NULL;
}
+ } else {
+ // Unsuccessful, need to put back on transmitList. Callee
+ // should not have messed with it (since it didn't accept that
+ // packet), so we can just push it back on the front.
+ assert(!sendEvent->scheduled());
+ transmitList.push_front(dp);
}
waitingOnRetry = !success;
unsigned int
SimpleTimingPort::drain(Event *de)
{
- if (transmitList.size() == 0)
+ if (transmitList.size() == 0 && !sendEvent->scheduled())
return 0;
drainEvent = de;
return 1;