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-rw-r--r--src/mem/bridge.cc2
-rw-r--r--src/mem/bus.cc7
-rw-r--r--src/mem/bus.hh2
-rw-r--r--src/mem/cache/cache.hh2
-rw-r--r--src/mem/cache/cache_impl.hh5
-rw-r--r--src/mem/mem_object.cc4
-rw-r--r--src/mem/mem_object.hh10
-rw-r--r--src/mem/port.cc65
-rw-r--r--src/mem/port.hh22
9 files changed, 76 insertions, 43 deletions
diff --git a/src/mem/bridge.cc b/src/mem/bridge.cc
index c09cacc00..25c6e5d19 100644
--- a/src/mem/bridge.cc
+++ b/src/mem/bridge.cc
@@ -47,7 +47,7 @@ Bridge::BridgePort::BridgePort(const std::string &_name,
int _delay, int _nack_delay, int _req_limit,
int _resp_limit,
std::vector<Range<Addr> > filter_ranges)
- : Port(_name), bridge(_bridge), otherPort(_otherPort),
+ : Port(_name, _bridge), bridge(_bridge), otherPort(_otherPort),
delay(_delay), nackDelay(_nack_delay), filterRanges(filter_ranges),
outstandingResponses(0), queuedRequests(0), inRetry(false),
reqQueueLimit(_req_limit), respQueueLimit(_resp_limit), sendEvent(this)
diff --git a/src/mem/bus.cc b/src/mem/bus.cc
index 3bf1c6cfc..9dd3353fd 100644
--- a/src/mem/bus.cc
+++ b/src/mem/bus.cc
@@ -72,8 +72,8 @@ Bus::getPort(const std::string &if_name, int idx)
return bp;
}
-void
-Bus::deletePortRefs(Port *p)
+bool
+Bus::deletePort(Port *p)
{
BusPort *bp = dynamic_cast<BusPort*>(p);
@@ -81,10 +81,11 @@ Bus::deletePortRefs(Port *p)
panic("Couldn't convert Port* to BusPort*\n");
// If this is our one functional port
if (funcPort == bp)
- return;
+ return false;
interfaces.erase(bp->getId());
clearBusCache();
delete bp;
+ return true;
}
/** Get the ranges of anyone other buses that we are connected to. */
diff --git a/src/mem/bus.hh b/src/mem/bus.hh
index 74901d626..7d476bb65 100644
--- a/src/mem/bus.hh
+++ b/src/mem/bus.hh
@@ -364,7 +364,7 @@ class Bus : public MemObject
/** A function used to return the port associated with this bus object. */
virtual Port *getPort(const std::string &if_name, int idx = -1);
- virtual void deletePortRefs(Port *p);
+ virtual bool deletePort(Port *p);
virtual void init();
virtual void startup();
diff --git a/src/mem/cache/cache.hh b/src/mem/cache/cache.hh
index 88c9deb7b..56ae811a3 100644
--- a/src/mem/cache/cache.hh
+++ b/src/mem/cache/cache.hh
@@ -217,7 +217,7 @@ class Cache : public BaseCache
Cache(const Params *p, TagStore *tags, BasePrefetcher *prefetcher);
virtual Port *getPort(const std::string &if_name, int idx = -1);
- virtual void deletePortRefs(Port *p);
+ virtual bool deletePort(Port *p);
void regStats();
diff --git a/src/mem/cache/cache_impl.hh b/src/mem/cache/cache_impl.hh
index 3b56c0a2e..a3dae7b2a 100644
--- a/src/mem/cache/cache_impl.hh
+++ b/src/mem/cache/cache_impl.hh
@@ -105,13 +105,14 @@ Cache<TagStore>::getPort(const std::string &if_name, int idx)
}
template<class TagStore>
-void
-Cache<TagStore>::deletePortRefs(Port *p)
+bool
+Cache<TagStore>::deletePort(Port *p)
{
if (cpuSidePort == p || memSidePort == p)
panic("Can only delete functional ports\n");
delete p;
+ return true;
}
diff --git a/src/mem/mem_object.cc b/src/mem/mem_object.cc
index ce2a1107e..7d27db763 100644
--- a/src/mem/mem_object.cc
+++ b/src/mem/mem_object.cc
@@ -43,8 +43,8 @@ MemObject::makeParams(const std::string &name)
return params;
}
-void
-MemObject::deletePortRefs(Port *p)
+bool
+MemObject::deletePort(Port *p)
{
panic("This object does not support port deletion\n");
}
diff --git a/src/mem/mem_object.hh b/src/mem/mem_object.hh
index 33b56dfd4..a91ea5ac4 100644
--- a/src/mem/mem_object.hh
+++ b/src/mem/mem_object.hh
@@ -64,9 +64,13 @@ class MemObject : public SimObject
/** Additional function to return the Port of a memory object. */
virtual Port *getPort(const std::string &if_name, int idx = -1) = 0;
- /** Tell object that this port is about to disappear, so it should remove it
- * from any structures that it's keeping it in. */
- virtual void deletePortRefs(Port *p) ;
+ /** Tell MemObject that this port is no longer in use, so it
+ * should remove it from any structures that it's keeping it in.
+ * If the port was allocated dynamically for this connection, it
+ * should be deleted here.
+ * @return True if the port was deleted, false if it still exists.
+ */
+ virtual bool deletePort(Port *p);
};
#endif //__MEM_MEM_OBJECT_HH__
diff --git a/src/mem/port.cc b/src/mem/port.cc
index 0e03194c9..1e6989750 100644
--- a/src/mem/port.cc
+++ b/src/mem/port.cc
@@ -39,17 +39,25 @@
#include "mem/mem_object.hh"
#include "mem/port.hh"
+/**
+ * Special class for port objects that are used as peers for
+ * unconnected ports. Assigning instances of this class to newly
+ * allocated ports allows us to guarantee that every port has a peer
+ * object (so there's no need to check for null peer pointers), while
+ * catching uses of unconnected ports.
+ */
class DefaultPeerPort : public Port
{
protected:
void blowUp()
{
- fatal("%s: Unconnected port!", peer->name());
+ Port *peer = getPeer();
+ fatal("unconnected port: %s", peer ? peer->name() : "<unknown>");
}
public:
- DefaultPeerPort()
- : Port("default_port")
+ DefaultPeerPort(Port *_peer)
+ : Port("default_port", NULL, _peer)
{ }
bool recvTiming(PacketPtr)
@@ -88,36 +96,59 @@ class DefaultPeerPort : public Port
bool isDefaultPort() const { return true; }
};
-DefaultPeerPort defaultPeerPort;
-Port::Port()
- : peer(&defaultPeerPort), owner(NULL)
+Port::Port(const std::string &_name, MemObject *_owner, Port *_peer) :
+ portName(_name),
+ peer(_peer ? _peer : new DefaultPeerPort(this)),
+ owner(_owner)
{
}
-Port::Port(const std::string &_name, MemObject *_owner)
- : portName(_name), peer(&defaultPeerPort), owner(_owner)
+Port::~Port()
{
+ disconnectFromPeer();
}
-Port::~Port()
+void
+Port::disconnectFromPeer()
{
+ if (peer) {
+ assert(peer->getPeer() == this);
+ peer->disconnect();
+ }
}
void
-Port::setPeer(Port *port)
+Port::disconnect()
{
- DPRINTF(Config, "setting peer to %s\n", port->name());
-
- peer = port;
+ // This notification should come only from our peer, so we must
+ // have one,
+ assert(peer != NULL);
+ // We must clear 'peer' here, else if owner->deletePort() calls
+ // delete on us then we'll recurse infinitely through the Port
+ // destructor.
+ peer = NULL;
+ // If owner->deletePort() returns true, then we've been deleted,
+ // so don't do anything but get out of here. If not, reset peer
+ // pointer to a DefaultPeerPort.
+ if (!(owner && owner->deletePort(this)))
+ peer = new DefaultPeerPort(this);
}
void
-Port::removeConn()
+Port::setPeer(Port *port)
{
- if (peer->getOwner())
- peer->getOwner()->deletePortRefs(peer);
- peer = NULL;
+ DPRINTF(Config, "setting peer to %s, old peer %s\n",
+ port->name(), peer ? peer->name() : "<null>");
+
+ // You'd think we'd want to disconnect from the previous peer
+ // here, but it turns out that with some functional ports the old
+ // peer keeps using the connection, and it works because
+ // functional ports are unidirectional.
+ //
+ // disconnectFromPeer();
+
+ peer = port;
}
void
diff --git a/src/mem/port.hh b/src/mem/port.hh
index 15fda2164..4e0d91e75 100644
--- a/src/mem/port.hh
+++ b/src/mem/port.hh
@@ -87,17 +87,14 @@ class Port
public:
- Port();
-
/**
* Constructor.
*
* @param _name Port name for DPRINTF output. Should include name
* of memory system object to which the port belongs.
* @param _owner Pointer to the MemObject that owns this port.
- * Will not necessarily be set.
*/
- Port(const std::string &_name, MemObject *_owner = NULL);
+ Port(const std::string &_name, MemObject *_owner, Port *_peer = NULL);
/** Return port name (for DPRINTF). */
const std::string &name() const { return portName; }
@@ -111,24 +108,18 @@ class Port
RangeChange
};
- void setName(const std::string &name)
- { portName = name; }
-
/** Function to set the pointer for the peer port. */
virtual void setPeer(Port *port);
/** Function to get the pointer to the peer port. */
Port *getPeer() { return peer; }
- /** Function to set the owner of this port. */
- void setOwner(MemObject *_owner) { owner = _owner; }
-
/** Function to return the owner of this port. */
MemObject *getOwner() { return owner; }
- /** Inform the peer port to delete itself and notify it's owner about it's
- * demise. */
- void removeConn();
+ /** Notify my peer port that I'm disconnecting (by calling its
+ * disconnect() method) so it can clean up. */
+ void disconnectFromPeer();
virtual bool isDefaultPort() const { return false; }
@@ -254,6 +245,11 @@ class Port
/** Internal helper function for read/writeBlob().
*/
void blobHelper(Addr addr, uint8_t *p, int size, MemCmd cmd);
+
+ /** Receive notification that my peer is disconnecting and clean
+ * up (potentially deleting myself in the process). Should be
+ * called only from peer's disconnectFromPeer(). */
+ void disconnect();
};
/** A simple functional port that is only meant for one way communication to
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-17 23:34:29 +0000