Merge zizzer:/bk/newmem

into  zeep.pool:/z/saidi/work/m5.newmem

--HG--
extra : convert_revision : c7fedc68996f2f6cbfb70baebf7c87e0736da883

4 files changed, 242 insertions, 58 deletions

diff --git a/src/mem/physical.cc b/src/mem/physical.cc
index 2d66602ab..291c70d8c 100644
--- a/src/mem/physical.cc
+++ b/src/mem/physical.cc
@@ -26,6 +26,7 @@
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  *
  * Authors: Ron Dreslinski
+ *          Ali Saidi
  */
 
 #include <sys/types.h>
@@ -52,24 +53,6 @@
 using namespace std;
 using namespace TheISA;
 
-PhysicalMemory::MemResponseEvent::MemResponseEvent(Packet *pkt, MemoryPort* _m)
-    : Event(&mainEventQueue, CPU_Tick_Pri), pkt(pkt), memoryPort(_m)
-{
-
-    this->setFlags(AutoDelete);
-}
-
-void
-PhysicalMemory::MemResponseEvent::process()
-{
-    memoryPort->sendTiming(pkt);
-}
-
-const char *
-PhysicalMemory::MemResponseEvent::description()
-{
-    return "Physical Memory Timing Access respnse event";
-}
 
 PhysicalMemory::PhysicalMemory(const string &n, Tick latency)
     : MemObject(n),base_addr(0), pmem_addr(NULL), port(NULL), lat(latency)
@@ -124,27 +107,8 @@ PhysicalMemory::deviceBlockSize()
     return 0;
 }
 
-bool
-PhysicalMemory::doTimingAccess (Packet *pkt, MemoryPort* memoryPort)
-{
-    doFunctionalAccess(pkt);
-
-    // turn packet around to go back to requester
-    pkt->makeTimingResponse();
-    MemResponseEvent* response = new MemResponseEvent(pkt, memoryPort);
-    response->schedule(curTick + lat);
-
-    return true;
-}
 
 Tick
-PhysicalMemory::doAtomicAccess(Packet *pkt)
-{
-    doFunctionalAccess(pkt);
-    return lat;
-}
-
-void
 PhysicalMemory::doFunctionalAccess(Packet *pkt)
 {
     assert(pkt->getAddr() + pkt->getSize() < pmem_size);
@@ -170,6 +134,7 @@ PhysicalMemory::doFunctionalAccess(Packet *pkt)
     }
 
     pkt->result = Packet::Success;
+    return lat;
 }
 
 Port *
@@ -195,7 +160,7 @@ PhysicalMemory::recvStatusChange(Port::Status status)
 
 PhysicalMemory::MemoryPort::MemoryPort(const std::string &_name,
                                        PhysicalMemory *_memory)
-    : Port(_name), memory(_memory)
+    : SimpleTimingPort(_name), memory(_memory)
 { }
 
 void
@@ -228,13 +193,20 @@ PhysicalMemory::MemoryPort::deviceBlockSize()
 bool
 PhysicalMemory::MemoryPort::recvTiming(Packet *pkt)
 {
-    return memory->doTimingAccess(pkt, this);
+    assert(pkt->result != Packet::Nacked);
+
+    Tick latency = memory->doFunctionalAccess(pkt);
+
+    pkt->makeTimingResponse();
+    sendTiming(pkt, latency);
+
+    return true;
 }
 
 Tick
 PhysicalMemory::MemoryPort::recvAtomic(Packet *pkt)
 {
-    return memory->doAtomicAccess(pkt);
+    return memory->doFunctionalAccess(pkt);
 }
 
 void
@@ -243,7 +215,16 @@ PhysicalMemory::MemoryPort::recvFunctional(Packet *pkt)
     memory->doFunctionalAccess(pkt);
 }
 
-
+unsigned int
+PhysicalMemory::drain(Event *de)
+{
+    int count = port->drain(de);
+    if (count)
+        changeState(Draining);
+    else
+        changeState(Drained);
+    return count;
+}
 
 void
 PhysicalMemory::serialize(ostream &os)
diff --git a/src/mem/physical.hh b/src/mem/physical.hh
index 50fa75ed3..b549c1f8b 100644
--- a/src/mem/physical.hh
+++ b/src/mem/physical.hh
@@ -37,7 +37,7 @@
 #include "base/range.hh"
 #include "mem/mem_object.hh"
 #include "mem/packet.hh"
-#include "mem/port.hh"
+#include "mem/tport.hh"
 #include "sim/eventq.hh"
 #include <map>
 #include <string>
@@ -47,7 +47,7 @@
 //
 class PhysicalMemory : public MemObject
 {
-    class MemoryPort : public Port
+    class MemoryPort : public SimpleTimingPort
     {
         PhysicalMemory *memory;
 
@@ -74,16 +74,6 @@ class PhysicalMemory : public MemObject
     int numPorts;
 
 
-    struct MemResponseEvent : public Event
-    {
-        Packet *pkt;
-        MemoryPort *memoryPort;
-
-        MemResponseEvent(Packet *pkt, MemoryPort *memoryPort);
-        void process();
-        const char *description();
-    };
-
   private:
     // prevent copying of a MainMemory object
     PhysicalMemory(const PhysicalMemory &specmem);
@@ -110,13 +100,10 @@ class PhysicalMemory : public MemObject
     void getAddressRanges(AddrRangeList &resp, AddrRangeList &snoop);
     virtual Port *getPort(const std::string &if_name, int idx = -1);
     void virtual init();
+    unsigned int drain(Event *de);
 
-    // fast back-door memory access for vtophys(), remote gdb, etc.
-    // uint64_t phys_read_qword(Addr addr) const;
   private:
-    bool doTimingAccess(Packet *pkt, MemoryPort *memoryPort);
-    Tick doAtomicAccess(Packet *pkt);
-    void doFunctionalAccess(Packet *pkt);
+    Tick doFunctionalAccess(Packet *pkt);
 
     void recvStatusChange(Port::Status status);
 
diff --git a/src/mem/tport.cc b/src/mem/tport.cc
new file mode 100644
index 000000000..90cf68f02
--- /dev/null
+++ b/src/mem/tport.cc
@@ -0,0 +1,82 @@
+/*
+ * Copyright (c) 2006 The Regents of The University of Michigan
+ * All rights reserved.
+ *
+ * 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: Ali Saidi
+ */
+
+#include "mem/tport.hh"
+
+void
+SimpleTimingPort::recvRetry()
+{
+    bool result = true;
+    while (result && transmitList.size()) {
+        result = Port::sendTiming(transmitList.front());
+        if (result)
+            transmitList.pop_front();
+    }
+   if (transmitList.size() == 0 && drainEvent) {
+       drainEvent->process();
+       drainEvent = NULL;
+   }
+}
+
+void
+SimpleTimingPort::SendEvent::process()
+{
+    port->outTiming--;
+    assert(port->outTiming >= 0);
+    if (port->Port::sendTiming(packet))
+       if (port->transmitList.size() == 0 && port->drainEvent) {
+           port->drainEvent->process();
+           port->drainEvent = NULL;
+       }
+       return;
+
+    port->transmitList.push_back(packet);
+}
+
+void
+SimpleTimingPort::resendNacked(Packet *pkt) {
+    pkt->reinitNacked();
+    if (transmitList.size()) {
+         transmitList.push_front(pkt);
+    } else {
+        if (!Port::sendTiming(pkt))
+            transmitList.push_front(pkt);
+    }
+};
+
+
+unsigned int
+SimpleTimingPort::drain(Event *de)
+{
+    if (outTiming == 0 && transmitList.size() == 0)
+        return 0;
+    drainEvent = de;
+    return 1;
+}
diff --git a/src/mem/tport.hh b/src/mem/tport.hh
new file mode 100644
index 000000000..5473e945e
--- /dev/null
+++ b/src/mem/tport.hh
@@ -0,0 +1,134 @@
+/*
+ * Copyright (c) 2006 The Regents of The University of Michigan
+ * All rights reserved.
+ *
+ * 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: Ali Saidi
+ */
+
+/**
+ * @file
+ * Implement a port which adds simple support of a sendTiming() function that
+ * takes a delay. In this way the * device can immediatly call
+ * sendTiming(pkt, time) after processing a request and the request will be
+ * handled by the port even if the port bus the device connects to is blocked.
+ */
+
+/** recvTiming and drain should be implemented something like this when this
+ * class is used.
+
+bool
+PioPort::recvTiming(Packet *pkt)
+{
+    if (pkt->result == Packet::Nacked) {
+        resendNacked(pkt);
+    } else {
+        Tick latency = device->recvAtomic(pkt);
+        // turn packet around to go back to requester
+        pkt->makeTimingResponse();
+        sendTiming(pkt, latency);
+    }
+    return true;
+}
+
+PioDevice::drain(Event *de)
+{
+    unsigned int count;
+    count = SimpleTimingPort->drain(de);
+    if (count)
+        changeState(Draining);
+    else
+        changeState(Drained);
+    return count;
+}
+*/
+
+#ifndef __MEM_TPORT_HH__
+#define __MEM_TPORT_HH__
+
+#include "mem/port.hh"
+#include "sim/eventq.hh"
+#include <list>
+#include <string>
+
+class SimpleTimingPort : public Port
+{
+  protected:
+    /** A list of outgoing timing response packets that haven't been serviced
+     * yet. */
+    std::list<Packet*> transmitList;
+    /**
+     * This class is used to implemented sendTiming() with a delay. When a delay
+     * is requested a new event is created. When the event time expires it
+     * attempts to send the packet. If it cannot, the packet is pushed onto the
+     * transmit list to be sent when recvRetry() is called. */
+    class SendEvent : public Event
+    {
+        SimpleTimingPort *port;
+        Packet *packet;
+
+        SendEvent(SimpleTimingPort *p, Packet *pkt, Tick t)
+            : Event(&mainEventQueue), port(p), packet(pkt)
+        { setFlags(AutoDelete); schedule(curTick + t); }
+
+        virtual void process();
+
+        virtual const char *description()
+        { return "Future scheduled sendTiming event"; }
+
+        friend class SimpleTimingPort;
+    };
+
+
+    /** Number of timing requests that are emulating the device timing before
+     * attempting to end up on the bus.
+     */
+    int outTiming;
+
+    /** If we need to drain, keep the drain event around until we're done
+     * here.*/
+    Event *drainEvent;
+
+    /** Schedule a sendTiming() event to be called in the future. */
+    void sendTiming(Packet *pkt, Tick time)
+    { outTiming++; new SimpleTimingPort::SendEvent(this, pkt, time); }
+
+    /** This function is notification that the device should attempt to send a
+     * packet again. */
+    virtual void recvRetry();
+
+    void resendNacked(Packet *pkt);
+  public:
+
+    SimpleTimingPort(std::string pname)
+        : Port(pname), outTiming(0), drainEvent(NULL)
+    {}
+
+    unsigned int drain(Event *de);
+
+    friend class SimpleTimingPort::SendEvent;
+};
+
+#endif // __MEM_TPORT_HH__