self.readfile = mdesc.script()
self.iobus = Bus(bus_id=0)
self.membus = Bus(bus_id=1)
- self.bridge = Bridge()
+ self.bridge = Bridge(fix_partial_write_b=True)
self.physmem = PhysicalMemory(range = AddrRange(mdesc.mem()))
self.bridge.side_a = self.iobus.port
self.bridge.side_b = self.membus.port
Bridge::BridgePort::BridgePort(const std::string &_name,
Bridge *_bridge, BridgePort *_otherPort,
- int _delay, int _queueLimit)
+ int _delay, int _queueLimit,
+ bool fix_partial_write)
: Port(_name), bridge(_bridge), otherPort(_otherPort),
- delay(_delay), outstandingResponses(0),
- queueLimit(_queueLimit), sendEvent(this)
+ delay(_delay), fixPartialWrite(fix_partial_write),
+ outstandingResponses(0), queueLimit(_queueLimit), sendEvent(this)
{
}
Bridge::Bridge(const std::string &n, int qsa, int qsb,
- Tick _delay, int write_ack)
+ Tick _delay, int write_ack, bool fix_partial_write_a,
+ bool fix_partial_write_b)
: MemObject(n),
- portA(n + "-portA", this, &portB, _delay, qsa),
- portB(n + "-portB", this, &portA, _delay, qsa),
+ portA(n + "-portA", this, &portB, _delay, qsa, fix_partial_write_a),
+ portB(n + "-portB", this, &portA, _delay, qsa, fix_partial_write_b),
ackWrites(write_ack)
{
+ if (ackWrites)
+ panic("No support for acknowledging writes\n");
}
Port *
{
// Make sure that both sides are connected to.
if (portA.getPeer() == NULL || portB.getPeer() == NULL)
- panic("Both ports of bus bridge are not connected to a bus.\n");
+ fatal("Both ports of bus bridge are not connected to a bus.\n");
+
+ if (portA.peerBlockSize() != portB.peerBlockSize())
+ fatal("Busses don't have the same block size... Not supported.\n");
}
bool
Bridge::BridgePort::queueForSendTiming(PacketPtr pkt)
{
- if (queueFull())
+ if (queueFull()) {
+ DPRINTF(BusBridge, "Queue full, returning false\n");
return false;
+ }
if (pkt->isResponse()) {
// This is a response for a request we forwarded earlier. The
assert(!sendQueue.empty());
bool was_full = queueFull();
+ int pbs = peerBlockSize();
PacketBuffer *buf = sendQueue.front();
PacketPtr pkt = buf->pkt;
+ pkt->flags &= ~SNOOP_COMMIT; //CLear it if it was set
+
+ if (pkt->cmd == MemCmd::WriteInvalidateReq && fixPartialWrite &&
+ pkt->getOffset(pbs) && pkt->getSize() != pbs) {
+ buf->partialWriteFix(this);
+ pkt = buf->pkt;
+ }
+
DPRINTF(BusBridge, "trySend: origSrc %d dest %d addr 0x%x\n",
buf->origSrc, pkt->getDest(), pkt->getAddr());
- pkt->flags &= ~SNOOP_COMMIT; //CLear it if it was set
+
if (sendTiming(pkt)) {
// send successful
sendQueue.pop_front();
} else {
DPRINTF(BusBridge, " unsuccessful\n");
+ buf->undoPartialWriteFix();
}
}
Param<int> queue_size_b;
Param<Tick> delay;
Param<bool> write_ack;
+ Param<bool> fix_partial_write_a;
+ Param<bool> fix_partial_write_b;
END_DECLARE_SIM_OBJECT_PARAMS(Bridge)
INIT_PARAM(queue_size_a, "The size of the queue for data coming into side a"),
INIT_PARAM(queue_size_b, "The size of the queue for data coming into side b"),
INIT_PARAM(delay, "The miminum delay to cross this bridge"),
- INIT_PARAM(write_ack, "Acknowledge any writes that are received.")
+ INIT_PARAM(write_ack, "Acknowledge any writes that are received."),
+ INIT_PARAM(fix_partial_write_a, "Fixup any partial block writes that are received"),
+ INIT_PARAM(fix_partial_write_b, "Fixup any partial block writes that are received")
END_INIT_SIM_OBJECT_PARAMS(Bridge)
CREATE_SIM_OBJECT(Bridge)
{
return new Bridge(getInstanceName(), queue_size_a, queue_size_b, delay,
- write_ack);
+ write_ack, fix_partial_write_a, fix_partial_write_b);
}
REGISTER_SIM_OBJECT("Bridge", Bridge)
/** Minimum delay though this bridge. */
Tick delay;
+ bool fixPartialWrite;
+
class PacketBuffer : public Packet::SenderState {
public:
short origSrc;
bool expectResponse;
+ bool partialWriteFixed;
+ PacketPtr oldPkt;
+
PacketBuffer(PacketPtr _pkt, Tick t)
: ready(t), pkt(_pkt),
origSenderState(_pkt->senderState), origSrc(_pkt->getSrc()),
- expectResponse(_pkt->needsResponse())
+ expectResponse(_pkt->needsResponse()), partialWriteFixed(false)
{
if (!pkt->isResponse())
pkt->senderState = this;
assert(pkt->senderState == this);
pkt->setDest(origSrc);
pkt->senderState = origSenderState;
+ if (partialWriteFixed)
+ delete oldPkt;
+ }
+
+ void partialWriteFix(Port *port)
+ {
+ assert(!partialWriteFixed);
+ assert(expectResponse);
+
+ int pbs = port->peerBlockSize();
+ partialWriteFixed = true;
+ PacketDataPtr data;
+
+ data = new uint8_t[pbs];
+ PacketPtr funcPkt = new Packet(pkt->req, MemCmd::ReadReq,
+ Packet::Broadcast, pbs);
+
+ funcPkt->dataStatic(data);
+ port->sendFunctional(funcPkt);
+ assert(funcPkt->result == Packet::Success);
+ delete funcPkt;
+
+ oldPkt = pkt;
+ memcpy(data + oldPkt->getOffset(pbs), pkt->getPtr<uint8_t>(),
+ pkt->getSize());
+ pkt = new Packet(oldPkt->req, MemCmd::WriteInvalidateReq,
+ Packet::Broadcast, pbs);
+ pkt->dataDynamicArray(data);
+ pkt->senderState = oldPkt->senderState;
}
+
+ void undoPartialWriteFix()
+ {
+ if (!partialWriteFixed)
+ return;
+ delete pkt;
+ pkt = oldPkt;
+ partialWriteFixed = false;
+ }
+
};
/**
/** Constructor for the BusPort.*/
BridgePort(const std::string &_name,
Bridge *_bridge, BridgePort *_otherPort,
- int _delay, int _queueLimit);
+ int _delay, int _queueLimit, bool fix_partial_write);
protected:
virtual void init();
- Bridge(const std::string &n, int qsa, int qsb, Tick _delay, int write_ack);
+ Bridge(const std::string &n, int qsa, int qsb, Tick _delay, int write_ack,
+ bool fix_partial_write_a, bool fix_partial_write_b);
};
#endif //__MEM_BUS_HH__
if (defaultPort == NULL) {
defaultPort = new BusPort(csprintf("%s-default",name()), this,
defaultId);
+ cachedBlockSizeValid = false;
return defaultPort;
} else
fatal("Default port already set\n");
assert(maxId < std::numeric_limits<typeof(maxId)>::max());
BusPort *bp = new BusPort(csprintf("%s-p%d", name(), id), this, id);
interfaces[id] = bp;
+ cachedBlockSizeValid = false;
return bp;
}
if (tickNextIdle > curTick ||
(retryList.size() && (!inRetry || pktPort != retryList.front()))) {
addToRetryList(pktPort);
+ DPRINTF(Bus, "recvTiming: Bus is busy, returning false\n");
return false;
}
inRetry = false;
}
occupyBus(pkt);
+ DPRINTF(Bus, "recvTiming: Packet sucessfully sent\n");
return true;
}
} else {
//Snoop didn't succeed
- DPRINTF(Bus, "Adding a retry to RETRY list %d\n",
+ DPRINTF(Bus, "Adding1 a retry to RETRY list %d\n",
pktPort->getId());
addToRetryList(pktPort);
return false;
}
// Packet not successfully sent. Leave or put it on the retry list.
- DPRINTF(Bus, "Adding a retry to RETRY list %d\n",
+ DPRINTF(Bus, "Adding2 a retry to RETRY list %d\n",
pktPort->getId());
addToRetryList(pktPort);
return false;
}
else {
//Forwarding up from responder, just return true;
+ DPRINTF(Bus, "recvTiming: can we be here?\n");
return true;
}
}
void
Bus::recvRetry(int id)
{
- DPRINTF(Bus, "Received a retry\n");
+ DPRINTF(Bus, "Received a retry from %s\n", id == -1 ? "self" : interfaces[id]->getPeer()->name());
// If there's anything waiting, and the bus isn't busy...
if (retryList.size() && curTick >= tickNextIdle) {
//retryingPort = retryList.front();
inRetry = true;
- DPRINTF(Bus, "Sending a retry\n");
+ DPRINTF(Bus, "Sending a retry to %s\n", retryList.front()->getPeer()->name());
retryList.front()->sendRetry();
// If inRetry is still true, sendTiming wasn't called
if (inRetry)
retryList.pop_front();
inRetry = false;
- //Bring tickNextIdle up to the present
- while (tickNextIdle < curTick)
- tickNextIdle += clock;
+ if (id != -1) {
+ //Bring tickNextIdle up to the present
+ while (tickNextIdle < curTick)
+ tickNextIdle += clock;
- //Burn a cycle for the missed grant.
- tickNextIdle += clock;
+ //Burn a cycle for the missed grant.
+ tickNextIdle += clock;
- if (!busIdle.scheduled()) {
- busIdle.schedule(tickNextIdle);
- } else {
- busIdle.reschedule(tickNextIdle);
- }
+ if (!busIdle.scheduled()) {
+ busIdle.schedule(tickNextIdle);
+ } else {
+ busIdle.reschedule(tickNextIdle);
+ }
+ } // id != -1
}
}
//If we weren't able to drain before, we might be able to now.
}
}
+int
+Bus::findBlockSize(int id)
+{
+ if (cachedBlockSizeValid)
+ return cachedBlockSize;
+
+ int max_bs = -1, tmp_bs;
+ range_map<Addr,int>::iterator portIter;
+ std::vector<DevMap>::iterator snoopIter;
+ for (portIter = portMap.begin(); portIter != portMap.end(); portIter++) {
+ tmp_bs = interfaces[portIter->second]->peerBlockSize();
+ if (tmp_bs > max_bs)
+ max_bs = tmp_bs;
+ }
+ for (snoopIter = portSnoopList.begin();
+ snoopIter != portSnoopList.end(); snoopIter++) {
+ tmp_bs = interfaces[snoopIter->portId]->peerBlockSize();
+ if (tmp_bs > max_bs)
+ max_bs = tmp_bs;
+ }
+ if (max_bs <= 0)
+ max_bs = defaultBlockSize;
+
+ if (max_bs != 64)
+ warn_once("Blocksize found to not be 64... hmm... probably not.\n");
+ cachedBlockSize = max_bs;
+ cachedBlockSizeValid = true;
+ return max_bs;
+}
+
+
unsigned int
Bus::drain(Event * de)
{
Param<int> clock;
Param<int> width;
Param<bool> responder_set;
+ Param<int> block_size;
END_DECLARE_SIM_OBJECT_PARAMS(Bus)
INIT_PARAM(bus_id, "a globally unique bus id"),
INIT_PARAM(clock, "bus clock speed"),
INIT_PARAM(width, "width of the bus (bits)"),
- INIT_PARAM(responder_set, "Is a default responder set by the user")
+ INIT_PARAM(responder_set, "Is a default responder set by the user"),
+ INIT_PARAM(block_size, "Default blocksize if no device has one")
END_INIT_SIM_OBJECT_PARAMS(Bus)
CREATE_SIM_OBJECT(Bus)
{
- return new Bus(getInstanceName(), bus_id, clock, width, responder_set);
+ return new Bus(getInstanceName(), bus_id, clock, width, responder_set,
+ block_size);
}
REGISTER_SIM_OBJECT("Bus", Bus)
/** Occupy the bus with transmitting the packet pkt */
void occupyBus(PacketPtr pkt);
+ /** Ask everyone on the bus what their size is
+ * @param id id of the busport that made the request
+ * @return the max of all the sizes
+ */
+ int findBlockSize(int id);
+
/** Declaration of the buses port type, one will be instantiated for each
of the interfaces connecting to the bus. */
class BusPort : public Port
AddrRangeList &snoop)
{ bus->addressRanges(resp, snoop, id); }
- // Hack to make translating port work without changes
- virtual int deviceBlockSize() { return 32; }
+ // Ask the bus to ask everyone on the bus what their block size is and
+ // take the max of it. This might need to be changed a bit if we ever
+ // support multiple block sizes.
+ virtual int deviceBlockSize()
+ { return bus->findBlockSize(id); }
};
/** Has the user specified their own default responder? */
bool responderSet;
+ int defaultBlockSize;
+ int cachedBlockSize;
+ bool cachedBlockSizeValid;
+
public:
/** A function used to return the port associated with this bus object. */
unsigned int drain(Event *de);
Bus(const std::string &n, int bus_id, int _clock, int _width,
- bool responder_set)
+ bool responder_set, int dflt_blk_size)
: MemObject(n), busId(bus_id), clock(_clock), width(_width),
tickNextIdle(0), drainEvent(NULL), busIdle(this), inRetry(false),
maxId(0), defaultPort(NULL), funcPort(NULL), funcPortId(-4),
- responderSet(responder_set)
+ responderSet(responder_set), defaultBlockSize(dflt_blk_size),
+ cachedBlockSize(0), cachedBlockSizeValid(false)
{
//Both the width and clock period must be positive
if (width <= 0)
{ SET5(IsWrite, IsInvalidate, IsRequest, HasData, NeedsResponse),
WriteInvalidateResp, "WriteInvalidateReq" },
/* WriteInvalidateResp */
- { SET5(IsWrite, IsInvalidate, IsRequest, NeedsResponse, IsResponse),
+ { SET3(IsWrite, IsInvalidate, IsResponse),
InvalidCmd, "WriteInvalidateResp" },
/* UpgradeReq */
{ SET3(IsInvalidate, IsRequest, IsUpgrade), InvalidCmd, "UpgradeReq" },
/** Called by a peer port in order to determine the block size of the
device connected to this port. It sometimes doesn't make sense for
- this function to be called, a DMA interface doesn't really have a
- block size, so it is defaulted to a panic.
+ this function to be called, so it just returns 0. Anytthing that is
+ concerned with the size should just ignore that.
*/
- virtual int deviceBlockSize() { panic("??"); M5_DUMMY_RETURN }
+ virtual int deviceBlockSize() { return 0; }
/** The peer port is requesting us to reply with a list of the ranges we
are responsible for.
queue_size_b = Param.Int(16, "The number of requests to buffer")
delay = Param.Latency('0ns', "The latency of this bridge")
write_ack = Param.Bool(False, "Should this bridge ack writes")
+ fix_partial_write_a = Param.Bool(False, "Should this bridge fixup partial block writes")
+ fix_partial_write_b = Param.Bool(False, "Should this bridge fixup partial block writes")
clock = Param.Clock("1GHz", "bus clock speed")
width = Param.Int(64, "bus width (bytes)")
responder_set = Param.Bool(False, "Did the user specify a default responder.")
+ block_size = Param.Int(64, "The default block size if one isn't set by a device attached to the bus.")
if build_env['FULL_SYSTEM']:
responder = BadAddr(pio_addr=0x0, pio_latency="1ps")
default = Port(Self.responder.pio, "Default port for requests that aren't handled by a device.")
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