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bus.cc:

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Fix atomic timing issue.

src/mem/bus.cc:
    Fix atomic timing issue.

--HG--
extra : convert_revision : a22ff80cd75f83c785b0604c2a4fde2e2e9f71ef
This commit is contained in:
Steve Reinhardt 2007-07-02 01:02:35 -07:00
parent 3ad761bc8e
commit ffd697e149
1 changed files with 12 additions and 9 deletions
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21
src/mem/bus.cc
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@ -377,7 +377,8 @@ Bus::recvAtomic(PacketPtr pkt)
// original command so that additional snoops can take place
// properly
MemCmd orig_cmd = pkt->cmd;
MemCmd response_cmd = MemCmd::InvalidCmd;
MemCmd snoop_response_cmd = MemCmd::InvalidCmd;
Tick snoop_response_latency = 0;
int orig_src = pkt->getSrc();
Port *target_port = findPort(pkt->getAddr(), pkt->getSrc());
@ -388,15 +389,16 @@ Bus::recvAtomic(PacketPtr pkt)
// same port should not have both target addresses and snooping
assert(p != target_port);
if (p->getId() != pkt->getSrc()) {
p->sendAtomic(pkt);
Tick latency = p->sendAtomic(pkt);
if (pkt->isResponse()) {
// response from snoop agent
assert(pkt->cmd != orig_cmd);
assert(pkt->memInhibitAsserted());
// should only happen once
assert(response_cmd == MemCmd::InvalidCmd);
assert(snoop_response_cmd == MemCmd::InvalidCmd);
// save response state
response_cmd = pkt->cmd;
snoop_response_cmd = pkt->cmd;
snoop_response_latency = latency;
// restore original packet state for remaining snoopers
pkt->cmd = orig_cmd;
pkt->setSrc(orig_src);
@ -405,19 +407,20 @@ Bus::recvAtomic(PacketPtr pkt)
}
}
Tick response_time = target_port->sendAtomic(pkt);
Tick response_latency = target_port->sendAtomic(pkt);
// if we got a response from a snooper, restore it here
if (response_cmd != MemCmd::InvalidCmd) {
if (snoop_response_cmd != MemCmd::InvalidCmd) {
// no one else should have responded
assert(!pkt->isResponse());
assert(pkt->cmd == orig_cmd);
pkt->cmd = response_cmd;
pkt->cmd = snoop_response_cmd;
response_latency = snoop_response_latency;
}
// why do we have this packet field and the return value both???
pkt->finishTime = std::max(response_time, curTick + clock);
return pkt->finishTime;
pkt->finishTime = curTick + response_latency;
return response_latency;
}
/** Function called by the port when the bus is receiving a Functional