X-Git-Url: https://git.libre-soc.org/?a=blobdiff_plain;f=src%2Fmem%2Ftport.cc;h=4de495e22f6d376ea65b547437ebc95384d70a0a;hb=abd33d6fd26bb69d3bf53ceb6c2dc8f90d893e34;hp=15c7fdf9f21c2eaa2529843d00a62fab09cd2dc5;hpb=dace77dc4a9fd95650cb4fe967fe28179672d9a3;p=gem5.git

diff --git a/src/mem/tport.cc b/src/mem/tport.cc
index 15c7fdf9f..4de495e22 100644
--- a/src/mem/tport.cc
+++ b/src/mem/tport.cc
@@ -1,4 +1,16 @@
 /*
+ * 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.
  *
@@ -26,53 +38,36 @@
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  *
  * Authors: Ali Saidi
+ *          Andreas Hansson
  */
 
 #include "mem/tport.hh"
+#include "sim/sim_object.hh"
 
-bool
-SimpleTimingPort::checkFunctional(PacketPtr pkt)
+SimpleTimingPort::SimpleTimingPort(const std::string& _name,
+                                   SimObject* _owner) :
+    QueuedSlavePort(_name, _owner, queueImpl), queueImpl(*_owner, *this)
 {
-    DeferredPacketIterator i = transmitList.begin();
-    DeferredPacketIterator end = transmitList.end();
-
-    for (; i != end; ++i) {
-        PacketPtr target = i->pkt;
-        // If the target contains data, and it overlaps the
-        // probed request, need to update data
-        if (pkt->checkFunctional(target)) {
-            return true;
-        }
-    }
-
-    return false;
 }
 
 void
 SimpleTimingPort::recvFunctional(PacketPtr pkt)
 {
-    if (!checkFunctional(pkt)) {
-        // Just do an atomic access and throw away the returned latency
+    if (!respQueue.trySatisfyFunctional(pkt)) {
+        // do an atomic access and throw away the returned latency
         recvAtomic(pkt);
     }
 }
 
 bool
-SimpleTimingPort::recvTiming(PacketPtr pkt)
+SimpleTimingPort::recvTimingReq(PacketPtr pkt)
 {
-    // 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->isRequest());
-
-    if (pkt->memInhibitAsserted()) {
-        // snooper will supply based on copy of packet
-        // still target's responsibility to delete packet
-        delete pkt;
-        return true;
-    }
+    // 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);
@@ -81,108 +76,11 @@ SimpleTimingPort::recvTiming(PacketPtr pkt)
         // recvAtomic() should already have turned packet into
         // atomic response
         assert(pkt->isResponse());
-        schedSendTiming(pkt, curTick + latency);
+        schedTimingResp(pkt, curTick() + latency);
     } else {
-        delete pkt;
+        // queue the packet for deletion
+        pendingDelete.reset(pkt);
     }
 
     return true;
 }
-
-
-void
-SimpleTimingPort::schedSendTiming(PacketPtr pkt, Tick when)
-{
-    assert(when > curTick);
-    assert(when < curTick + Clock::Int::ms);
-
-    // Nothing is on the list: add it and schedule an event
-    if (transmitList.empty() || when < transmitList.front().tick) {
-        transmitList.push_front(DeferredPacket(when, pkt));
-        schedSendEvent(when);
-        return;
-    }
-
-    // list is non-empty & this belongs at the end
-    if (when >= transmitList.back().tick) {
-        transmitList.push_back(DeferredPacket(when, pkt));
-        return;
-    }
-
-    // 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) {
-            transmitList.insert(i, DeferredPacket(when, pkt));
-            return;
-        }
-    }
-    assert(false); // should never get here
-}
-
-
-void
-SimpleTimingPort::sendDeferredPacket()
-{
-    assert(deferredPacketReady());
-    // 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) {
-        if (!transmitList.empty() && !sendEvent->scheduled()) {
-            Tick time = transmitList.front().tick;
-            sendEvent->schedule(time <= curTick ? curTick+1 : time);
-        }
-
-        if (transmitList.empty() && drainEvent) {
-            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;
-
-    if (waitingOnRetry) {
-        DPRINTF(Bus, "Send failed, waiting on retry\n");
-    }
-}
-
-
-void
-SimpleTimingPort::recvRetry()
-{
-    DPRINTF(Bus, "Received retry\n");
-    assert(waitingOnRetry);
-    sendDeferredPacket();
-}
-
-
-void
-SimpleTimingPort::processSendEvent()
-{
-    assert(!waitingOnRetry);
-    sendDeferredPacket();
-}
-
-
-unsigned int
-SimpleTimingPort::drain(Event *de)
-{
-    if (transmitList.size() == 0)
-        return 0;
-    drainEvent = de;
-    return 1;
-}