/*
+ * Copyright (c) 2012 ARM Limited
+ * All rights reserved.
+ *
+ * The license below extends only to copyright in the software and shall
+ * 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
+ * terms below provided that you ensure that this notice is replicated
+ * unmodified and in its entirety in all distributions of the software,
+ * modified or unmodified, in source code or in binary form.
+ *
* Copyright (c) 2006 The Regents of The University of Michigan
* All rights reserved.
*
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
* Authors: Ali Saidi
+ * Andreas Hansson
*/
#include "mem/tport.hh"
-void
-SimpleTimingPort::recvFunctional(Packet *pkt)
-{
- // just do an atomic access and throw away the returned latency
- recvAtomic(pkt);
-}
+#include "mem/mem_object.hh"
-bool
-SimpleTimingPort::recvTiming(Packet *pkt)
+SimpleTimingPort::SimpleTimingPort(const std::string& _name,
+ MemObject* _owner) :
+ QueuedSlavePort(_name, _owner, queueImpl), queueImpl(*_owner, *this)
{
- // If the device is only a slave, it should only be sending
- // responses, which should never get nacked. There used to be
- // 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);
- Tick latency = recvAtomic(pkt);
- // turn packet around to go back to requester if response expected
- if (pkt->needsResponse()) {
- pkt->makeTimingResponse();
- sendTimingLater(pkt, latency);
- }
- return true;
}
void
-SimpleTimingPort::recvRetry()
+SimpleTimingPort::recvFunctional(PacketPtr pkt)
{
- assert(outTiming > 0);
- assert(!transmitList.empty());
- if (sendTiming(transmitList.front())) {
- transmitList.pop_front();
- outTiming--;
- DPRINTF(Bus, "No Longer waiting on retry\n");
- if (!transmitList.empty())
- sendTimingLater(transmitList.front(), 1);
- }
-
- if (transmitList.empty() && drainEvent) {
- drainEvent->process();
- drainEvent = NULL;
+ if (!respQueue.trySatisfyFunctional(pkt)) {
+ // do an atomic access and throw away the returned latency
+ recvAtomic(pkt);
}
}
-void
-SimpleTimingPort::SendEvent::process()
+bool
+SimpleTimingPort::recvTimingReq(PacketPtr pkt)
{
- assert(port->outTiming > 0);
- if (!port->transmitList.empty() && port->transmitList.front() != packet) {
- //We are not the head of the list
- port->transmitList.push_back(packet);
- } else if (port->sendTiming(packet)) {
- // send successful
- if (port->transmitList.size()) {
- port->transmitList.pop_front();
- port->outTiming--;
- if (!port->transmitList.empty())
- port->sendTimingLater(port->transmitList.front(), 1);
- }
- if (port->transmitList.empty() && port->drainEvent) {
- port->drainEvent->process();
- port->drainEvent = NULL;
- }
+ // the SimpleTimingPort should not be used anywhere where there is
+ // a need to deal with snoop responses and their flow control
+ // requirements
+ if (pkt->cacheResponding())
+ panic("SimpleTimingPort should never see packets with the "
+ "cacheResponding flag set\n");
+
+ bool needsResponse = pkt->needsResponse();
+ Tick latency = recvAtomic(pkt);
+ // turn packet around to go back to requester if response expected
+ if (needsResponse) {
+ // recvAtomic() should already have turned packet into
+ // atomic response
+ assert(pkt->isResponse());
+ schedTimingResp(pkt, curTick() + latency);
} else {
- // send unsuccessful (due to flow control). Will get retry
- // callback later; save for then if not already
- DPRINTF(Bus, "Waiting on retry\n");
- if (!(port->transmitList.front() == packet))
- port->transmitList.push_back(packet);
+ // queue the packet for deletion
+ pendingDelete.reset(pkt);
}
-}
-
-unsigned int
-SimpleTimingPort::drain(Event *de)
-{
- if (outTiming == 0 && transmitList.size() == 0)
- return 0;
- drainEvent = de;
- return 1;
+ return true;
}