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+/*
+ * Copyright (c) 2012-2013, 2016-2018 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.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * 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
+ * documentation and/or other materials provided with the distribution;
+ * neither the name of the copyright holders nor the names of its
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ * Authors: Thomas Grass
+ * Andreas Hansson
+ * Sascha Bischoff
+ */
+#include "cpu/testers/traffic_gen/base.hh"
+
+#include <sstream>
+
+#include "base/intmath.hh"
+#include "base/random.hh"
+#include "cpu/testers/traffic_gen/base_gen.hh"
+#include "debug/Checkpoint.hh"
+#include "debug/TrafficGen.hh"
+#include "params/BaseTrafficGen.hh"
+#include "sim/sim_exit.hh"
+#include "sim/stats.hh"
+#include "sim/system.hh"
+
+using namespace std;
+
+BaseTrafficGen::BaseTrafficGen(const BaseTrafficGenParams* p)
+ : MemObject(p),
+ system(p->system),
+ elasticReq(p->elastic_req),
+ progressCheck(p->progress_check),
+ noProgressEvent([this]{ noProgress(); }, name()),
+ nextTransitionTick(0),
+ nextPacketTick(0),
+ port(name() + ".port", *this),
+ retryPkt(NULL),
+ retryPktTick(0),
+ updateEvent([this]{ update(); }, name()),
+ numSuppressed(0),
+ masterID(system->getMasterId(this))
+{
+}
+
+BaseMasterPort&
+BaseTrafficGen::getMasterPort(const string& if_name, PortID idx)
+{
+ if (if_name == "port") {
+ return port;
+ } else {
+ return MemObject::getMasterPort(if_name, idx);
+ }
+}
+
+void
+BaseTrafficGen::init()
+{
+ MemObject::init();
+
+ if (!port.isConnected())
+ fatal("The port of %s is not connected!\n", name());
+}
+
+DrainState
+BaseTrafficGen::drain()
+{
+ if (!updateEvent.scheduled()) {
+ // no event has been scheduled yet (e.g. switched from atomic mode)
+ return DrainState::Drained;
+ }
+
+ if (retryPkt == NULL) {
+ // shut things down
+ nextPacketTick = MaxTick;
+ nextTransitionTick = MaxTick;
+ deschedule(updateEvent);
+ return DrainState::Drained;
+ } else {
+ return DrainState::Draining;
+ }
+}
+
+void
+BaseTrafficGen::serialize(CheckpointOut &cp) const
+{
+ DPRINTF(Checkpoint, "Serializing BaseTrafficGen\n");
+
+ // save ticks of the graph event if it is scheduled
+ Tick nextEvent = updateEvent.scheduled() ? updateEvent.when() : 0;
+
+ DPRINTF(TrafficGen, "Saving nextEvent=%llu\n", nextEvent);
+
+ SERIALIZE_SCALAR(nextEvent);
+
+ SERIALIZE_SCALAR(nextTransitionTick);
+
+ SERIALIZE_SCALAR(nextPacketTick);
+}
+
+void
+BaseTrafficGen::unserialize(CheckpointIn &cp)
+{
+ // restore scheduled events
+ Tick nextEvent;
+ UNSERIALIZE_SCALAR(nextEvent);
+ if (nextEvent != 0)
+ schedule(updateEvent, nextEvent);
+
+ UNSERIALIZE_SCALAR(nextTransitionTick);
+
+ UNSERIALIZE_SCALAR(nextPacketTick);
+}
+
+void
+BaseTrafficGen::update()
+{
+ // shift our progress-tracking event forward
+ reschedule(noProgressEvent, curTick() + progressCheck, true);
+
+ // if we have reached the time for the next state transition, then
+ // perform the transition
+ if (curTick() >= nextTransitionTick) {
+ transition();
+ } else {
+ assert(curTick() >= nextPacketTick);
+ // get the next packet and try to send it
+ PacketPtr pkt = activeGenerator->getNextPacket();
+
+ // suppress packets that are not destined for a memory, such as
+ // device accesses that could be part of a trace
+ if (system->isMemAddr(pkt->getAddr())) {
+ numPackets++;
+ if (!port.sendTimingReq(pkt)) {
+ retryPkt = pkt;
+ retryPktTick = curTick();
+ }
+ } else {
+ DPRINTF(TrafficGen, "Suppressed packet %s 0x%x\n",
+ pkt->cmdString(), pkt->getAddr());
+
+ ++numSuppressed;
+ if (numSuppressed % 10000)
+ warn("%s suppressed %d packets with non-memory addresses\n",
+ name(), numSuppressed);
+
+ delete pkt;
+ pkt = nullptr;
+ }
+ }
+
+ // if we are waiting for a retry, do not schedule any further
+ // events, in the case of a transition or a successful send, go
+ // ahead and determine when the next update should take place
+ if (retryPkt == NULL) {
+ nextPacketTick = activeGenerator->nextPacketTick(elasticReq, 0);
+ scheduleUpdate();
+ }
+}
+
+void
+BaseTrafficGen::transition()
+{
+ if (activeGenerator)
+ activeGenerator->exit();
+
+ activeGenerator = nextGenerator();
+
+ if (activeGenerator) {
+ const Tick duration = activeGenerator->duration;
+ if (duration != MaxTick && duration != 0) {
+ // we could have been delayed and not transitioned on the
+ // exact tick when we were supposed to (due to back
+ // pressure when sending a packet)
+ nextTransitionTick = curTick() + duration;
+ } else {
+ nextTransitionTick = MaxTick;
+ }
+
+ activeGenerator->enter();
+ nextPacketTick = activeGenerator->nextPacketTick(elasticReq, 0);
+ } else {
+ nextPacketTick = MaxTick;
+ nextTransitionTick = MaxTick;
+ assert(!updateEvent.scheduled());
+ }
+}
+
+void
+BaseTrafficGen::scheduleUpdate()
+{
+ // schedule next update event based on either the next execute
+ // tick or the next transition, which ever comes first
+ const Tick nextEventTick = std::min(nextPacketTick, nextTransitionTick);
+ if (nextEventTick == MaxTick)
+ return;
+
+ DPRINTF(TrafficGen, "Next event scheduled at %lld\n", nextEventTick);
+
+ // The next transition tick may be in the past if there was a
+ // retry, so ensure that we don't schedule anything in the past.
+ schedule(updateEvent, std::max(curTick(), nextEventTick));
+}
+
+void
+BaseTrafficGen::start()
+{
+ transition();
+ scheduleUpdate();
+}
+
+void
+BaseTrafficGen::recvReqRetry()
+{
+ assert(retryPkt != NULL);
+
+ DPRINTF(TrafficGen, "Received retry\n");
+ numRetries++;
+ // attempt to send the packet, and if we are successful start up
+ // the machinery again
+ if (port.sendTimingReq(retryPkt)) {
+ retryPkt = NULL;
+ // remember how much delay was incurred due to back-pressure
+ // when sending the request, we also use this to derive
+ // the tick for the next packet
+ Tick delay = curTick() - retryPktTick;
+ retryPktTick = 0;
+ retryTicks += delay;
+
+ if (drainState() != DrainState::Draining) {
+ // packet is sent, so find out when the next one is due
+ nextPacketTick = activeGenerator->nextPacketTick(elasticReq,
+ delay);
+ scheduleUpdate();
+ } else {
+ // shut things down
+ nextPacketTick = MaxTick;
+ nextTransitionTick = MaxTick;
+ signalDrainDone();
+ }
+ }
+}
+
+void
+BaseTrafficGen::noProgress()
+{
+ fatal("BaseTrafficGen %s spent %llu ticks without making progress",
+ name(), progressCheck);
+}
+
+void
+BaseTrafficGen::regStats()
+{
+ ClockedObject::regStats();
+
+ // Initialise all the stats
+ using namespace Stats;
+
+ numPackets
+ .name(name() + ".numPackets")
+ .desc("Number of packets generated");
+
+ numRetries
+ .name(name() + ".numRetries")
+ .desc("Number of retries");
+
+ retryTicks
+ .name(name() + ".retryTicks")
+ .desc("Time spent waiting due to back-pressure (ticks)");
+}
+
+bool
+BaseTrafficGen::TrafficGenPort::recvTimingResp(PacketPtr pkt)
+{
+ delete pkt;
+
+ return true;
+}
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