Yu-hsin Wang has uploaded this change for review. (
https://gem5-review.googlesource.com/c/public/gem5/+/32735 )
Change subject: systemc: Send response to TLM side if a packet does not
need response
......................................................................
systemc: Send response to TLM side if a packet does not need response
A completed TLM transaction includes request and response parts.
Currently, if a gem5 packet does not need a reponse, the bridge would not
send BEGIN_RESP to its upstream. It causes stuck on TLM side.
To fix this problem, the bridge should send BEGIN_RESP by itself in this
case.
Change-Id: I318dec21bc3f291693715c0d70bc624addf05076
---
M src/systemc/tlm_bridge/tlm_to_gem5.cc
1 file changed, 14 insertions(+), 0 deletions(-)
diff --git a/src/systemc/tlm_bridge/tlm_to_gem5.cc
b/src/systemc/tlm_bridge/tlm_to_gem5.cc
index e6cb483..6d16c47 100644
--- a/src/systemc/tlm_bridge/tlm_to_gem5.cc
+++ b/src/systemc/tlm_bridge/tlm_to_gem5.cc
@@ -162,8 +162,15 @@
auto tlmSenderState = new TlmSenderState(trans);
pkt->pushSenderState(tlmSenderState);
+ // If the packet doesn't need a response, we should send BEGIN_RESP by
+ // ourselves.
+ bool needsResponse = pkt->needsResponse();
if (bmp.sendTimingReq(pkt)) { // port is free -> send END_REQ
immediately
sendEndReq(trans);
+ if (!needsResponse) {
+ auto delay = sc_core::SC_ZERO_TIME;
+ sendBeginResp(trans, delay);
+ }
trans.release();
} else { // port is blocked -> wait for retry before sending END_REQ
waitForRetry = true;
@@ -429,12 +436,19 @@
sc_assert(pendingRequest != nullptr);
sc_assert(pendingPacket != nullptr);
+ // If the packet doesn't need a response, we should send BEGIN_RESP by
+ // ourselves.
+ bool needsResponse = pkt->needsResponse();
if (bmp.sendTimingReq(pendingPacket)) {
waitForRetry = false;
pendingPacket = nullptr;
auto &trans = *pendingRequest;
sendEndReq(trans);
+ if (!needsResponse) {
+ auto delay = sc_core::SC_ZERO_TIME;
+ sendBeginResp(trans, delay);
+ }
trans.release();
pendingRequest = nullptr;
--
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Gerrit-Project: public/gem5
Gerrit-Branch: develop
Gerrit-Change-Id: I318dec21bc3f291693715c0d70bc624addf05076
Gerrit-Change-Number: 32735
Gerrit-PatchSet: 1
Gerrit-Owner: Yu-hsin Wang <yuhsi...@google.com>
Gerrit-MessageType: newchange
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